HRV Vertical Unit Ventilators

Transcription

1 HRV Vertical Unit Ventilators Classroom Ventilators with Energy Recovery Installation, Operation and Maintenance Instructions Manual Capacity: Up to 1,400 cfm Model: HRV450w, HRV1000w

2 Table of Contents Nomenclature...3 Safety Considerations...5 General Information...5 Recommended Spare Parts...5 Inspection on Arrival...6 Transportation...6 Unit Application Limitations...6 Installation...7 Unit Location Requirements...7 DX Cooling Coil...7 Drain Connections...8 Supply Discharge Top Plenum...8 Hydronic Heating Coil Piping...9 Ductwork...9 Electrical Connections...10 Start-up...12 Pre Start-up Procedure...12 Start-up Procedure...12 Sequence of Operation...17 Controls...19 Airflow Balancing...20 Maintenance...21 Monthly Maintenance...21 Annual Maintenance...22 Appendix A: Equipment Data...23 Appendix B: Unit Dimensions...24 Appendix C: Electrical Data...29 Appendix D: High Voltage Wiring Connections...30 Appendix E: Programmable Room Thermostat and Low Voltage Wiring Connections...31 Appendix F: HRV450w and HRV1000w Start-up Form and Checklist...33 Appendix G: Airflow and Component Performance Data...41 Appendix H: Internal Thermostat...47 Appendix I: HRV450w and HRV1000w Troubleshooting...48 Appendix J: HRV450w and HRV1000w Maintenance Summary Chart...49 VCES-VUV-IOM-1B HRV450w & HRV1000w 2

3 Nomenclature HRV450w Nomenclature ( cfm) FROST CONTROL D Recirc defrost 1 N Non-defrost 2. VOLTAGE/SPEED A 120/1/60 2 two-speed B 208/120/1/60 3 two-speed C 230/120/1/60 3 two-speed 3. ENERGY RECOVERY P Polypropylene core A Aluminum core 4. HEATING E Staged electric H Hot water 2 P Proportional electric 4 X No heat 2 5. HEATING CAPACITY/HOUR 0 No heat kw (one-stage) kw (one-stage) kw (two-stage) kw (two-stage) kw (two-stage) ,000 Btu ,000 Btu 7 6. COOLING D DX cooling R Fixed recirculation option X No cooling 12. BOTTOM BASE B Bottom base, no grille G Bottom base, c/w grille X No bottom base 11. EXTERNAL DISCONNECT N Non-fused disconnect switch 8 X No disconnect switch 10. EXHAUST AIR DAMPER 1 Motorized 2 Spring return 3 No damper 9. OUTSIDE AIR DAMPER 1 Insulated motorized 2 Insulated spring return 3 No damper 8. SUPPLY DISCHARGE T Top plenum, no grille G Top plenum, c/w grille D Top plenum, c/w double deflection grille X No top plenum 7. CONTROLS T Programmable room thermostat X No thermostat Notes: 1 When ordering recirc defrost, you must order outside air and exhaust air dampers. 2 Hot water and no heat options available in 120 VAC option only. 3 Requires a neutral wire with L1 and L2. 4 Must select a two-stage heating capacity option; first stage is proportional and second stage is fixed. 5 Only available with no heat. 6 Only available with electric heat. 7 Only available with hot water heating. 8 Non-fused disconnect switch is field installed (remote mounted) Nortek Air Solutions Canada Inc. All rights reserved throughout the world. Illustrations cover the general appearance of Venmar CES products at the time of publication and Nortek Air Solutions reserves the right to make changes in design and construction at any time without notice. Nortek Air Solutions, LLC d/b/a Venmar CES furnishes equipment pursuant to its then-current Terms and Conditions of Sale and Limited Warranty, copies of which can be found under the Terms & Conditions of Sale and Warranty link at Extended warranties, if any, shall be as offered and acknowledged in writing by Venmar CES. VCES-VUV-IOM-1B HRV450w & HRV1000w 3

4 HRV1000w Nomenclature (400 1,400 cfm) FROST CONTROL D Recirc defrost 1 N Non-defrost 2. VOLTAGE/SPEED A 120/1/60 two-speed 2 B 208/120/1/60 two-speed 3 C 230/120/1/60 two-speed 3 3. ENERGY RECOVERY P Polypropylene core A Aluminum core 4. HEATING E Staged electric H Hot water P Proportional electric 4 X No heat 5. HEATING CAPACITY/HOUR 0 No heat kw (one-stage) kw (one-stage) kw (two-stage) kw (two-stage) kw (two-stage) kw (two-stage) kw (two-stage) ,000 Btu ,000 Btu 7 6. COOLING D DX cooling X No cooling 11. EXTERNAL DISCONNECT N Non-fused disconnect switch 9 X No disconnect switch 10. EXHAUST AIR DAMPER 1 Motorized 2 Spring return 3 No damper 9. OUTSIDE AIR DAMPER 1 Insulated motorized 2 Insulated spring return 3 No damper 8. SUPPLY DISCHARGE T Top plenum, no grille G Top plenum, c/w grille D Top plenum, c/w double deflection grille S Silencer plenum c/w double deflection grille 8 X No top plenum 7. CONTROLS T Programmable room thermostat X No thermostat Notes: 1 When ordering recirc defrost, you must order outside air and exhaust air dampers. 2 Hot water and no heat options available in 120 VAC option only. 3 Requires a neutral wire with L1 and L2. 4 Must select a two-stage heating capacity option; first stage is proportional and second stage is fixed. 5 Only available with no heat. 6 Only available with electric heat. 7 Only available with hot water heating. 8 Silencer plenum option is not available with DX cooling option. 9 Non-fused disconnect switch is field installed (remote mounted). VCES-VUV-IOM-1B HRV450w & HRV1000w 4

5 Safety Considerations Warning, Caution and Important notes appear throughout this manual in specific and appropriate locations to alert Installing Contractors, maintenance or service personnel of potential safety hazards, possible equipment damage or to alert personnel of special procedures or instructions that must be followed as outlined below. WARNING Identifies an instruction which, if not followed, might cause serious personal injuries including possibility of death. CAUTION Identifies an instruction which, if not followed, might severely damage the unit, its components, the assembly or final installation. Hazards may exist within this equipment because it contains electrical and powerful moving components. Only qualified service personnel should install or service this equipment. Untrained personnel can perform basic maintenance such as maintaining filters. Observe precautions marked in literature and on labels attached to unit. Follow all safety codes. WARNING Disconnect the main power switch to the unit before performing service or maintenance. Electric shock can cause personal injury or death. IMPORTANT Indicates supplementary information needed to fully complete an instruction or installation. General Information This manual is designed to provide general information on the common operation of all standard and optional components that may have been installed in the unit. Note that some sections of this manual may not apply to your unit. This manual has been designed for general purpose and describes options offered by Venmar CES that could be included in the unit. Consult the manual from the Component Manufacturer if more detailed technical information about a specific component is required. Instructions for accessory items which are shipped loose for field installation are included with the item. The electrical schematic is attached to the inside of the control panel. See Appendix A for more detailed equipment data. Recommended Spare Parts Spare parts should be ordered at the time the installation is accepted by the Owner. Spare parts will reduce the down time in the event of a failure. The list of spare parts outlined below is considered minimal. Installation in remote locations or when the operation of heating equipment is essential may require more spare parts than listed. Please contact the Service Department at Venmar CES for recommendations. Minimum spare parts include: Two sets of fuses One set of filters VCES-VUV-IOM-1B HRV450w & HRV1000w 5

6 Inspection on Arrival The unit is shipped in a vertical inverted position with plastic wrap, cardboard sleeve and hold down straps on a wooden pallet to keep center of gravity low. Inspect the equipment exterior packaging for any damage on arrival that may have occurred during unit shipment and for shipped loose parts. Ensure that there is no damage to any exterior packaging that would cause damage to unit casing, internal components or to shipped loose parts such as the supply discharge top plenum, DX cooling coil and drain pan assembly, programmable room thermostat, disconnect switch or accessory items. Check the packing slip against all items received. If any items are missing, sign the carrier s bill of lading with the notation Shipment Received Less Item #. File a claim with the shipping company if the unit or shipped loose items are damaged. Contact the factory immediately if damage is found. No return shipment will be accepted without authorization. Transportation The unit should always be moved in a vertical or slightly angled from vertical position. Transportation of the cabinet on its side, front or back can cause damage to external panels or internal supports for heavy components. Take care to prevent damage to the unit when it is being moved or inverted. Painted external components are not structural and can be damaged easily by pressure from moving equipment. If it is necessary to move the unit with an appliance mover or two-wheeled dolly from the side or front, adequate corner to corner support and paint protection must be provided. Pressure on the center of a side panel or door panel may cause denting. It is possible to remove the front access doors to lighten the unit and/or prevent damage to the painted panels when moving the unit to the upright position. Unit Application Limitations CAUTION Venmar CES equipment is not designed to be used for temporary heating, cooling and/or ventilation during construction. Using Venmar CES units for temporary ventilation during construction is subject to the unit warranty terms and should be reviewed carefully before proceeding, as this may void the standard warranty conditions. Fine dust, larger particulate matter, solvents, varnishes and other chemicals may cause filter clogging and elevated cabinet pressures, higher power consumption and possible irreparable damage to the flat plate heat recovery module, which could reduce energy recovery performance of the plate and damage to other components. Potential damages include, but are not limited to, these examples. VCES-VUV-IOM-1B HRV450w & HRV1000w 6

7 Installation Unit Location Requirements Consult local building codes and electrical codes for special installation requirements and note additional requirements listed in this manual. In choosing the installation location of the unit, consider the following factors: The unit must be installed on a level base foundation to allow condensation to flow into internal drains. Zero clearance is allowable between the bottom of the unit and any combustible material. The unit should be installed to allow easy access for maintenance. See Appendix B for dimensions and recommended service and maintenance clearances. WARNING Unit location must allow 24 [610 mm] clearance in front of the control box cover for access and 12 [305 mm] clearance on the left side for access to the fan Low Off High ventilation rate switch and on/off first stage heating switch. On the HRV450w with DX cooling, a 2 [51 mm] space must be left on the right side of the unit to allow for recirculation airflow. To prevent poor performance for air conditioning, allow 4 to 6 [102 to 152 mm] from the right side to any wall or partition. Dimensions for rear wall penetration locations are provided in Appendix B. Zero clearance is allowable between back exterior surfaces and any combustible material. The unit must be mounted in a heated area to prevent condensate lines from freezing. The fresh air intake must be positioned away from sources of contamination. The unit should be mounted close to a condensate drain and power supply. The unit should be mounted away from hot chimneys, electrical panels and other hazards. DX Cooling Coil Place the factory provided insulation with the coil and drain pan assembly on top of the unit over the matching supply opening. Place the coil and drain pan assembly over the insulation and supply air opening. Place provided clips in opposing corners of coil drain pan and fasten down to the top of unit with screws. Leave enough clearance around the back and side edges of the unit to allow installation of the supply discharge top plenum or ducting as required. See Appendix B for installing the coil and drain pan assembly on top of the Vertical Unit Ventilator. The refrigerant liquid line includes an orifice (piston or flow rator) to regulate the liquid refrigerant. Connection size, type and location are shown in Appendix B. Holes in the supply discharge top plenum or supply ducting are to be field cut to accommodate the refrigerant lines. The refrigerant suction and liquid line connections are made at the coil (equipped with solder connects); see Appendix B for line sizes and location. The DX cooling coil must be field connected to a remote field supplied and installed condensing unit. The liquid line should be insulated to avoid condensation. The design and sizing of the refrigerant lines is by others. Units equipped with a DX cooling coil and drain pan assembly are factory provided with a length or ½ [12.7 mm] I.D., 5/8 [15.9 mm] O.D. PVC flexible condensate drain line which must be field connected to the drain pan fitting, then extended through a hole located in the top front right corner of the unit and through the inside front right corner of the unit to flow into the drain pan located under the plate heat exchanger. Holes through partitions and tie down straps are factory provided inside the front right corner of the unit to extend the drain line. The supply discharge top plenum will accommodate the condensate drain line within the plenum. See Electrical Connections, Controls and Sequence of Operation for details and requirements on control wiring connections and sequence for DX cooling. VCES-VUV-IOM-1B HRV450w & HRV1000w 7

8 Drain Connections The plate heat exchanger drain pan is factory piped to a bottom drain pan located inside the bottom of the unit above the collector base or return grille. The bottom drain pain has an internal ¾ MPT drain fitting which is accessible by removing front bottom access panel or grille. Drain line must be field extended through a field cut hole in the unit or bottom collector base. A water trap minimum 2 [50.8 mm] in height must be provided in the drain line to prevent sewer gases from entering the unit. Ensure adequate slope to the drain line to allow for good drainage, ¼ per foot [6 mm per 305 mm] recommended minimum. The drain must be installed in an area in which it will not freeze. Installing a plug, using PVC line or similar method for inspection and cleaning of the trap is recommended. Refer to local codes for proper drainage requirements. Prime the trap by filling with water before start-up. Check and clear drains quarterly. Drainage problems can occur should drains be inactive and dry out, or due to reduced water flow caused by buildup of algae. Regular maintenance will prevent these problems from occurring. Supply Discharge Top Plenum The supply discharge top plenum is shipped assembled and comes complete with a length of neoprene gasket with adhesive strip, three pre-punched lengths of flat sheet metal strip and self-drilling screws. The neoprene gasket must be field attached to the inside bottom perimeter of the top plenum base so the compressed gasket does not extend outside the casing. Lift the plenum on top of the unit and position properly. Attach half the width of the longest metal strip along the top front of the unit and the other half on the plenum with sheet metal screws. Attach the two smaller pieces on the rear of the unit and plenum in a similar fashion (see Figure 1). The front panel of the top plenum is removable to reduce weight and for access for electrical wiring and piping connections. IMPORTANT Holes in the supply discharge top plenum must be field cut to accommodate piping and electrical wiring connections. The silencer plenum does not allow top access for coil piping or electrical wiring connections. These connections must be field cut and run through the back of the unit. Figure 1: Front and rear supply discharge top plenum installation views (HRV1000w shown) VCES-VUV-IOM-1B HRV450w & HRV1000w 8

9 Hydronic Heating Coil Piping Holes are provided in the top of the unit for extending hydronic heating coil piping connections; see Appendix B for location and size. Holes for hydronic heating coil piping connections must be field cut into the supply discharge top plenum if supplied. The front panel of the top plenum is removable for access for piping connections. IMPORTANT The silencer plenum does not allow top access for coil piping connections. These connections can be fitted with elbows and must be field cut and run through the back of the unit. Units equipped with hot water heating coils come without factory supplied controls for controlling flow, etc. The design of the hydronic piping lines, components, electric controls, interlocks and sequence of control is by others. For hydronic heating, a field supplied and installed control valve is recommended to control the supply air discharge temperature from the unit. See Electrical Connections, Controls and Sequence of Operation for further details and requirements on control wiring connections and sequence. Ductwork For units installed without a supply discharge top plenum or with a ducted top supply discharge plenum with no grilles, see Appendix B for location and required dimension of the supply ducting connections based on options provided with the unit. Make connections to the casing with flanged duct by applying caulking around the connection and screwing flanged duct directly to the casing with self-drilling sheet metal screws. It is important to seal duct connections to prevent air leakage and system performance problems. Ductwork must be supported by the building structure. Zero clearance is allowable between the supply duct and any combustible material. The outdoor and exhaust air duct connections are provided with duct flanges; see Appendix B for location and required dimensions. It is important to seal all duct connections to prevent air leakage and system performance problems. Ductwork must be supported by the building structure. The outdoor and exhaust air ducts connected to outside, as well as any ducts passing through an unconditioned space, must have a minimum insulation value of R5. In addition, a continuous integral vapor barrier over the duct insulation must be used. WARNING The supply air ducting must be constructed so there are no openings within 30 [762 mm] of the electric heating elements. Openings within 30 [762 mm] of the elements must be fitted with a permanent, non-removable protective screening with 7/16 [11.1 mm] maximum opening to prevent possibility of personal injury. Failure to follow this warning could result in the Installer being liable for personal injury of others. VCES-VUV-IOM-1B HRV450w & HRV1000w 9

10 Electrical Connections WARNING When installed, the unit must be electrically grounded in accordance with local codes or, in the absence of local codes, with the National Electrical Code, ANSI/NFPA70, and/or the Canadian Electrical Code CSA C22.1. Unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. Failure to follow this warning could result in the Installer being liable for personal injury of others. Power Supply Units are available in 120 VAC, single-phase, 60 Hertz with or without hydronic heating or DX cooling, or in 208 or 230 VAC, single-phase, 60 Hertz with electric heat. See Appendix C for electrical data. Check nameplate for correct power supply requirements. The units do not have a factory installed disconnect switch. An optional NEMA 3R non-fused disconnect switch is available as an option and is shipped separately for field installation. If disconnect is field supplied, provide and install disconnect as per NEC/ Canadian Electrical Code. Use copper conductors only. All field wiring must comply with NEC and local requirements. In Canada, electrical connections must be in accordance with CSA C22.1 Canadian Electrical Code Part One. Field Wiring Connections Location and size of required wire connections are shown in Appendix B. A wiring diagram is located on the control box lid inside the unit. See Appendix B for components locations. Field supplied and installed sealed strain relief clamps must be fitted into the unit casing to accommodate the power line input and control wiring connections. If a sealed clamp cannot be used, the holes must be sealed with silicone or an equivalent water- and air-tight sealant. If the unit has a supply discharge top plenum, holes must be field cut in the plenum to accommodate the wiring connections. The front panel of the top plenum is removable for access for electrical wiring connections. IMPORTANT The silencer plenum does not allow top access for electrical wiring connections. These connections must be field cut through the back of the unit. Table 1: Power Line Input Connection Terminals, Description and Wire Colors for 208 VAC or 230 VAC, Single-phase, 60 Hertz, with Electric Heat Power Line Input L1 Hot Black L2 Hot Red N Neutral White GRD Ground Bare Power Output L1 to N 120 VAC/60 Hz/1 Ph L1 to L VAC/60 Hz/1 Ph Table 2: Power Line Input Connection Terminals, Description and Wire Colors for 120 VAC 60, Singlephase, 60 Hertz, with or without Hydronic Heating or DX Cooling Power Line Input L1 Hot Black N Neutral White GRD Ground Bare Power Output L1 to N 120 VAC/60 Hz/1 Ph Control Wiring Connections The unit is configured to be controlled by an optional factory supplied programmable room thermostat with sevenday occupied (ventilation), unoccupied (recirculation), heating and cooling control. The unit has a low voltage remote control wiring interface terminal strip located within the control box. All control wiring connections are 24 VAC 60 Hertz. The programmable room thermostat, building management system (BMS) or field supplied control and other optional or accessory factory supplied controls for the units and type of connections are listed below. For programmable room thermostat and low voltage wiring connections see Appendix E. Notes: 1. Check the Controls and/or the Control Schematic sections of the specification, optional and accessory items shipped loose with the unit for a list of optional controls that must be field mounted and for wiring connections required to the unit. 2. See Controls and Sequence of Operation for further details. Terminals for power line input connections are located in the control box within the unit and are labeled as shown in Table 1 and Table 2. Connections are illustrated in Appendix D. VCES-VUV-IOM-1B HRV450w & HRV1000w 10

11 Programmable Room Thermostat Eight-wire LVT, 18 gauge recommended (24 VAC). See Appendix E for further details. DX Cooing Coil Two-wire (one-wire if no return line required) LVT, 18 gauge recommended (24 VAC). A field connection from terminals Y2 (+24 VAC: Hot) and C ( 24 VAC: Common) on the terminal block (inside the control box) must be run to a relay with contacts wired to start the remote condensing unit for second stage cooling. Hot Water Heating Coil Units equipped with hot water heating coils come without factory supplied controls for controlling flow, etc. The design of the hydronic piping lines, components, electric controls, discharge temperature sensors, interlocks and sequence of control is by others. Consult with the Installing and/or Controls Contractor for controls and sequence for hot water heating. Two-wire LVT, 19 gauge recommended (24 VAC). A field connection from W1 (+24 VAC: Hot) and C ( 24 VAC: Common) on the terminal block (inside the control box) must be run to a relay with contacts wired to open a three-way control valve with a modulating actuator (with temperature sensors to control the supply air discharge temperature) for first stage heating. Note: A factory mounted freeze control temperature disc is provided with hydronic units to prevent the coils from freezing up. This temperature disc is located between the supply fan and hydronic coil, and factory wired to bypass power to terminal W1 to power the control valve that controls hydronic flow to the coil to open when supply temperature drops below setting. See wiring schematic for connections. Two-wire LVT, 18 gauge recommended (24 VAC). A field connection from W2 (+24 VAC: Hot) and C ( 24 VAC: Common) on the terminal block (inside the control box) must be run to a relay with contacts wired to increase the supply air discharge temperature or to activate supplementary or auxiliary heating for second stage heating. Electric Heating Coil Units equipped with factory installed electric heating coils come with factory installed first stage heating switch, internal thermostats and high temperature limit control as indicated in Controls and Sequence of Operation for first and second stage electric heating. Two-wire LVT, 18 gauge recommended (24 VAC). A field connection from W2 (+24 VAC: Hot) and C ( 24 VAC: Common) on the terminal block (inside the control box) must be run to a relay with contacts wired to activate supplementary or auxiliary heating for third stage heating. Remote Wall Mounted CO 2 Ventilation Control (Accessory) Two-wire LVT 18 gauge recommended (24 VAC) is required to switch fans to high speed. See wiring schematic for connections required. CO 2 ventilation control requires separate 24 VAC power supply. Building Management Systems (BMS) or Field Supplied Control Ten-wire (maximum depending on options) LVT 18 gauge recommended (24 VAC). For units with hot water heating coil additional control wiring may be required. See Hot Water Heating Coil. For BMS or for field supplied control of the unit, see Table 3 for the list of low voltage wiring connection interface terminal numbers located in the unit control box and their operational descriptions to determine the connections required. Each operation is activated by switching (closing a dry contact between terminal) R and the corresponding operation terminal. For full control of the unit by the BMS or field supplied controls, the factory installed external ventilation rate switch and first stage heating switch (if equipped) should be set to Off. External ventilation rate switch set to Low or High or first stage heating switch set to On will override the BMS or field supplied controls. See Controls and Sequence of Operation for details on operating sequence and controls provided with unit. Table 3: Control Box Low Voltage Connection Terminal Numbers, Operational Descriptions and Wire Color Terminal Number Operational Description Factory Wire Color R +24 VAC: Hot Black C 24 VAC: Common White W1 Stage 1: Heating and signal for optional baseboard heating contactor Orange W2 Stage 2: Heating and recirculation Red Y1 Stage 1: Free cooling Yellow Y2 Stage 2: Optional DX cooling Yellow S1 Occupied mode Violet S2 N/A N/A FL Fans: Low speed Blue FH Fans: High speed Brown G Fans: Off Green VCES-VUV-IOM-1B HRV450w & HRV1000w 11

12 Start-up Pre Start-up Procedure Before requesting start-up, check that the installation is complete and unit is ready. Complete the pre start-up checklist below and in Appendix F for each unit as items are checked. 1. Check the electrical disconnect is in the Off position. 2. Open access doors and check the unit for shipped loose parts, obstructive packaging, objects near or in fans, dampers, flat plate exchanger, etc. 3. Check fan motor mounts are secure. 4. Check that the fans and motors are rotating freely. 5. Check that the air filters are installed and clean. Replace if necessary. 6. Check dampers and linkages for free movement. 7. Check that ductwork is connected, complete and has been cleaned of nuts, bolts, sheet metal parts, etc. 8. Check that condensate drain connections have been trapped, installed correctly and filled. 9. Check that all shipped loose or field supplied components have been correctly installed and wired. 10. Check that all power supplies and control wiring have been inspected and approved by the Local Authorities having jurisdiction. 11. Check all factory and field wiring connections for tightness. Tighten if necessary. 12. Check that all fuses are properly installed in holders. 13. Check the voltage at the disconnect switch against the nameplate. If the voltage is not within 10% of rated have the condition corrected before continuing start-up. 14. Check that all field piping, venting, installation and connections for the heating and cooling options and/ or accessories (if equipped) have been completed and tested. 15. Check and adjust thermostat setpoints. Start-up Procedure To ensure proper operation of each unit, qualified personnel should perform the start-up and complete the checklist below and the start-up form in Appendix F for permanent record. A completed checklist will provide valuable information for personnel performing future maintenance. Before proceeding, check the submittal documents for the options and accessories included with the unit then review the operation of the control options and accessories provided with the unit. See Controls and Sequence of Operation for functional descriptions and further details. See Table 5 and Table 6 for occupied and unoccupied operating sequence test procedure jumper wires. All units are factory run tested. Fans are set up to run correct when power is connected. All units are dynamically balanced prior to shipping. However, there are certain operating speeds at which the natural frequency of the rotating member is attuned to the natural frequency of the unit panels, which may cause vibrations. These vibrations can tend to reinforce each other in such a way that excessive vibration can be encountered under certain conditions. It is difficult to predetermine this condition because it is affected by the mounting arrangement and the various modules used to make up the assembly and the ductwork connections. If the above check reveals no apparent discrepancies and vibration is still present, the speed of the unit should be changed to determine if the natural frequency is causing the vibration. Under no condition should the unit(s) be allowed to continue to operate when excessive unit vibration is apparent. Permanent damage may result which will not be covered under the warranty if the unit is allowed to continue in operation when excessive vibrations are evident. IMPORTANT A completed copy must be sent back to the factory for warranty validation and for factory assistance. 1. Before proceeding complete the pre start-up checklist. 2. Review the Controls, Sequence of Operation and the programmable room thermostat (T7350) information and programming package (if provided with unit). 3. For units with the programmable room thermostat (T7350) remove the thermostat from the sub-base for the initial start-up check to ensure all controls and sequences are operational. For units with BMS or field supplied controls ensure there are no control signals to the unit control box terminal strip before proceeding. 4. Install separate tagged jumper wires between terminals R to G and R to S1 in the unit control box as shown in Table 5 to test operation in ventilation or occupied mode. 5. Set the ventilation rate switch and the first stage heating switch located on the exterior upper left side panel of the unit to the Off positions (if provided). 6. Check that all access panels or doors are closed. VCES-VUV-IOM-1B HRV450w & HRV1000w 12

13 7. Turn the unit disconnect switch to the On position. 8. Set the ventilation rate switch to Low to enable ventilation or occupied mode. 9. Check that the outdoor and exhaust dampers open and the supply and exhaust fans are operating at low speed. 10. Set the ventilation rate switch to High and check that the outdoor and exhaust dampers are open and the supply and exhaust fans are operating at high speed. On the HRV1000w the exhaust fan motor is set for single speed only. 11. Re-check the voltage at the disconnect switch against the nameplate with all fans operating. If the voltage is not within 10% of rated have the condition corrected before continuing start-up. 12. Check amperage draw to each motor against motor nameplate FLA at low and high speed. Do not allow the motor amp draw to exceed the Motor Manufacturer s nameplate data. Excessive amp draw will cause premature failure of the motor and void the motor warranty. If significantly higher, adjust the ductwork static pressure to lower the amperage draw below the nameplate FLA or change the motor speed setting (HRV1000w only). a. On the HRV1000w there are four speed settings available with the controls, only two of which can be functional on the supply fan motor. The units are factory set to use the low and high speed taps on the supply blower motors. If additional or less airflow is required, the second and third speed tap can be used instead of the low or high speed tap. See Table 4 for motor connection verses speed. 13. On units with a frost control option, if outdoor temperature is above 23 F [ 5 C], set the ventilation rate switch to Off and turn the unit disconnect switch to the Off position. a. To test the defrost cycle, locate the grey cable running into a four-pin connector on the control box. The cable separates into two smaller wires at the connector. Install a separate tagged jumper wire with accessible on/off switch set to the Off position between these two small wires. b. Check that all access panels or doors are closed, turn the unit disconnect switch to the On position and set the ventilation rate switch to Low to enable ventilation or occupied mode. c. Wait for external dampers to open, fans to run, then set the on/off switch in point a to the On position to short the two small wires together and activate the defrost cycle. Check the supply fan switches to high speed, the exhaust fan turns off, outside and exhaust dampers close and recirculation damper opens, as shown in Table 5. The defrost cycle is 6/12 defrost/ventilation minutes. d. To cancel the defrost cycle, set the ventilation rate switch to Off, turn the unit disconnect switch to the Off position and remove tagged jumper wire with accessible on/off switch. 14. On units with electric heating option: a. If outdoor temperature conditions are summer, adjust the internal thermostat (T675) sensing air temperature entering the electric coil to the fully clockwise position or between 70 F and 90 F [21 C and 38 C]. b. On units with proportional electric heating, if outdoor temperature conditions are summer, adjust the internal thermostat (T991) sensing air temperature leaving the electric coil to the fully clockwise position or 90 F [38 C]. c. Check that all access panels or doors are closed. d. Turn the unit disconnect switch to the On position. e. Set the ventilation rate switch to Low to enable ventilation or occupied mode. f. Check that the outdoor and exhaust dampers open and the supply and exhaust fans are operating at low speed. g. Set the first stage heating switch located on the exterior upper left side panel of the unit to the On position. There is a 90-second time delay before the electric coil is energized. Check the electric coil is energized, allow to operate until stable and take amperage reading on the coil. Do not operate long if outdoor temperature is summer as high limits may trip. h. Install jumper wire between terminals R to W1 for second stage heating. Allow to operate until stable and take amperage reading on the electric coil for second stage heating. Do not operate long if outdoor temperature is summer as high limits may trip. i. Install jumper wire between terminals R to W2 for third stage heating. Check the operation of the third stage heating options. Note the exhaust fan is off, exhaust and outdoor dampers are closed, recirculation damper opens and supply fan is switched to high speed as shown in Table 5. j. Set the first stage heating switch located on the exterior upper left side panel of the unit to the Off position and allow fans to run a few minutes to cool the electric coil or other heating options then set the ventilation rate switch to Off for fans to stop and exterior dampers to close. k. Remove the jumper wires between terminals R to S1, set the ventilation rate switch to Low and check that the outdoor and exhaust dampers remain closed, recirculation damper is open VCES-VUV-IOM-1B HRV450w & HRV1000w 13

14 and the supply and exhaust fan are operating as shown in Table 6 to test operation in recirculation or unoccupied mode. l. Set the first stage heating switch located on the exterior upper left side panel of the unit to the On position. i. On the HRV450w, in first stage heating the supply fan and electric coil remains off in unoccupied mode as shown in Table 6. ii. On the HRV1000w, there is a 90-second time delay before the electric coil is energized. Check the electric coil is energized and allow to operate until stable. Do not operate long if outdoor temperature is summer as high limits may trip. m. Install jumper wire between terminals R to W1 for second stage heating and allow to operate until stable. Do not operate long if outdoor temperature is summer as high limits may trip. n. Install jumper wire between terminals R to W2 for third stage heating. Check the operation of the third stage heating options. Note the supply fan is switched to high speed as shown in Table 6. o. Set the first stage heating switch located on the exterior upper left side panel of the unit to the Off position. Remove the jumper wires between terminals R to W1, R to W2 and allow supply fan to run a few minutes to cool the electric coil or other heating options. p. Set the ventilation rate switch to Off and turn the unit disconnect switch to the Off position. q. Reset the on/off and proportional internal thermostats to their original or desired setpoints and record. 15. On units with hot water heating option, check with the Controls Contactor for controls provided, sequence of operation and test procedure required. Note the first stage heating switch and internal thermostats are not included with hot water heating hence there is no heating first stage. a. If outdoor temperature conditions are summer, check with the Controls Contractor for changes to temperature setpoints or control valve required. b. To test the freeze control temperature disc, install a jumper wire across the exposed metal on each connector on the disc. The freeze control temperature disc is located between the supply blower and the hot water coil. c. Check that all access panels or doors are closed. d. Turn the unit disconnect switch to the On position. e. Set the ventilation rate switch to Low to enable ventilation or occupied mode. f. Check the operation of the freeze control temperature disc by waiting approximately 3 minutes to see if dampers remain closed and fans are off. g. Set the ventilation rate switch to Off, turn the unit disconnect switch to the Off position and remove the jumper wire across the exposed metal on each connector of the freeze control temperature disc. h. Check that all access panels or doors are closed. i. Turn the unit disconnect switch to the On position. j. Set the ventilation rate switch to Low to enable ventilation or occupied mode. k. Check that the outdoor and exhaust dampers open and the supply and exhaust fans are operating at low speed. l. Install jumper wire between terminals R to W1 for second stage heating. Check that hot water heating is operational. m. Install jumper wire between terminals R to W2 for third stage heating. Check the operation of the third stage heating options. Note the exhaust fan is off, exhaust and outdoor dampers are closed, recirculation damper opens and supply fan is switched to high speed as shown in Table 5. n. Remove jumper wires between terminals R to W1 and R to W2 and allow fans to run a few minutes to cool the hot water coil or other heating options, then set the ventilation rate switch to Off for fans to stop and exterior dampers to close. o. Remove the jumper wires between terminals R to S1, set the ventilation rate switch to Low and check that the outdoor and exhaust dampers remain closed, recirculation damper is open and the supply and exhaust fan are operating as shown in Table 6 to test operation in recirculation or unoccupied mode. p. Install jumper wire between terminals R to W1 for second stage heating check that hot water heating is operational. q. Install jumper wire between terminals R to W2 for third stage heating, check the operation of the third stage heating options. Note the supply fan is switched to high speed as shown in Table 6. r. Remove jumper wire between terminals R to W1 and R to W2 and allow supply fan to run a few minutes to cool the hot water coil or other heating options. s. Set the ventilation rate switch to Off and turn the unit disconnect switch to the Off position. t. Reset thermostats or other controls to their original or desired setpoints and record. VCES-VUV-IOM-1B HRV450w & HRV1000w 14

15 16. On units with cooling option: a. If outdoor temperature conditions are winter, it is not possible to test the remote condensers for DX cooling and will have to return when outdoor conditions are favorable. b. Install jumper wire between terminals R to S1 in the unit control box to test operation in ventilation or occupied mode. c. Check that all access panels or doors are closed. d. Turn the unit disconnect switch to the On position. e. Set the ventilation rate switch to Low to enable ventilation or occupied mode. f. Check that the outdoor and exhaust dampers open and the supply and exhaust fans are operating at low speed. g. Install jumper wire between terminals R to Y1 for first stage cooling position. Check that the outdoor and exhaust dampers remain open, the supply is operating at high speed and the exhaust fan is off. On the HRV450w with DX cooling, check the damper behind the screened opening on the right side of the unit is closed as shown in Table 5. h. Install jumper wire between terminals R to Y2 for second stage cooling, check that the outdoor and exhaust dampers remain open, the supply is operating at high speed and the exhaust fan is on. On the HRV450w with DX cooling, check the damper behind the screened opening on the right upside of the unit is open as shown in Table 5. i. Check that DX cooling is operational. j. Remove jumper wire between terminals R to Y1 and R to Y2, allow fans to run a few minutes if required for the cooling options then set the ventilation rate switch to Off for fans to stop and exterior dampers to close. k. Remove the jumper wires between terminals R to S1 set the ventilation rate switch to Low and check that the outdoor and exhaust dampers remain closed, recirculation damper is open and the supply and exhaust fan are operating as shown in Table 6 to test operation in recirculation or unoccupied mode. l. Install jumper wire between terminals R to Y1 for first stage cooling, check that the outdoor and exhaust dampers remain closed. i. On the HRV450w check the supply and exhaust fans are off; on units with DX cooling, check the damper behind the screened opening on the right side of the unit is closed as shown in Table 6. ii. On the HRV1000w, check the supply is operating at low speed and the exhaust fan is off as shown in Table 6. m. Install jumper wire between terminals R to Y2 for second stage cooling, check that the outdoor and exhaust dampers remain closed, the supply fan is operating at high speed and the exhaust fan is off. On the HRV450w with DX cooling, check the damper behind the screened opening on the right upside of the unit is open as shown in Table 6. n. Check that DX cooling is operational. o. Remove jumper wires between terminals R to Y1 and R to Y2, allow fans to run a few minute if required for the cooling options. p. Set the ventilation rate switch to Off, turn the unit disconnect switch to the Off position and remove the jumper wires between terminals R to G. q. Reset thermostats or other controls to their original or desired setpoints and record. 17. Check the operation of the control options and accessories provided with the unit. See Controls and Sequence of Operation for functional descriptions and further details. 18. Check the setpoints on thermostats and controls; adjust and record changes as required. 19. Ensure all tagged jumper wires between terminal R to G, S1, W1, W2, Y1, Y2, etc., used for start-up are removed in the unit control box. 20. For units with the programmable room thermostat (T7350) install the thermostat onto the sub-base. Turn the disconnect switch On. Use the T7350 test mode to check the thermostat configurations and operation of the unit. 21. For units with field supplied or BMS controls check the control signals are connected. Turn the disconnect switch on. Check the operating sequence of the unit with field supplied or BMS controls to the operating sequence of the unit. 22. Complete the readings section of the Start-up Form and Checklist in Appendix F and send copy of the Start-up Form and Checklist to Nortek Air Solutions Canada to validate warranty. Maintain a copy of the report at the unit for future reference. Table 4: HRV1000w Motor Connections vs. Speed 120V, 208V or 230V Speed Red White Low Orange White Second Blue White Third Black White High VCES-VUV-IOM-1B HRV450w & HRV1000w 15

16 Table 5: HRV450w & HRV1000w Summarized Occupied Operating Sequence and Connections Sequence Jumper/Controlled Exhaust OA Exhaust DX Damper Supply Motor By Motor Damper Damper (Option: HRV450w Only) Occupied R: S1 Off Off Closed Closed Closed Ventilate R: S1, G Low or High (switch) On Open Open Closed Heating First Stage (Electric heating units only) R: S1, G/Int. Stat Low On Open Open Closed Heating Second Stage R: S1, G, W1 Low On Open Open Closed Heating Third Stage or Recirculation R: S1, G, W1, W2 High Off Closed Closed Closed Cooling First Stage R: S1, G, Y1 High Off Open Open Closed Cooling Second Stage/DX R: S1, G, Y1, Y2 High On Open Open Open Freeze Protection R; S1, G/Supply air thermo-disc High Off Closed Closed Closed Defrost R: S1, G/Timer, OA thermo-disc High Off Closed Closed Closed Table 6: HRV450w & HRV1000w Summarized Unoccupied Operating Sequence and Connections Sequence Jumper Supply Motor Exhaust OA Exhaust DX Damper Motor Damper Damper (Option: HRV450w Only) Unoccupied Non Off Off Closed Closed Closed Recirculation R: G Low Off Closed Closed Closed Heating First Stage Off HRV450w R: G/Int. Stat (Electric heating units only) Low HRV1000w Off Closed Closed Closed Heating Second Stage R: G, W1 Low Off Closed Closed Closed Heating Third Stage R: G, W1, W2 High Off Closed Closed Closed Cooling First Stage R: G, Y1 Off HRV450w Low HRV1000w Off Closed Closed Closed Cooling Second Stage/DX R: G, Y1, Y2 High Off Closed Closed Open VCES-VUV-IOM-1B HRV450w & HRV1000w 16

17 Sequence of Operation This sequence of operation is designed to provide general information on the common operation of all standard and optional components offered by Venmar CES that may have been installed in the units. Note that some sections of this sequence may not apply to your unit. Following the written sequence are summarized tables of the occupied and unoccupied sequence with the connections required for your convenience. The term signal to in the sequence means the designated terminal on the terminal block (inside the control box) is energized with +24 VAC: Hot through the programmable room thermostat or field supplied controls. Ventilation Control Install the power to the unit as per local electrical codes and complete the following ventilation control modes to ensure proper unit operation. Occupied Mode No Ventilation Call Signal to S1 engages occupied mode. Supply and exhaust fan motors are off. Outdoor and exhaust air ventilation dampers close. Recirculation defrost damper (with frost control option installed) opens. Ventilation Call Additional signal to G engages ventilation when the ventilation rate switch is on either High or Low, both supply and exhaust fans are on. On the HRV450w, when the outdoor and exhaust air ventilation dampers are open, the supply air is 100% outdoor air. With the fixed recirculation option a portion of recirculated room air to outdoor air is provided based on supply external static pressure. See Appendix G for airflow and ventilation information. On the HRV1000w, when the outdoor and exhaust air ventilation dampers are open, the supply air is a mixture with a percentage of return air to outdoor air provided based on fixed positions of an internal recirc panel. See Appendix G for airflow and ventilation information. Heating Call (Electric Heating Units) First stage heating for electric heating units is engaged from an internal thermostat located upstream of the electric coil when the first stage heating switch is On, when the supply air temperature falls below its factory setpoint of 59 F [15 C] (actual 55 F [12.8 C] with differential set at 4 F [2.2 C]) and after a 90-second delay. With the proportional electric heat option, an additional internal modulating thermostat with sensor mounted in the supply air discharge downstream of the electric coil and connected to an SCR will modulate first stage electric heat to maintain a supply air discharge temperature leaving the electric coil of 55 F [12.8 C]. Additional signal to W1 engages the second stage of the electric coil after a time delay, both supply and exhaust fans are set to low speed. Additional signal to W2 engages third stage heating after a time delay. The outdoor and exhaust air ventilation dampers close, recirculation defrost damper (with frost control option installed) opens, supply fan only runs in recirculation mode on high speed and second stage electric heating remains energized. If required, a field supplied baseboard heater or other heating unit can be interlocked to start. Heating Call (Hot Water Heating Units) Hot water controls are designed, supplied and installed by others. Consult with the Installing and/or Controls Contractor for controls and sequence for hot water heating. Additional signal to W1 engages first stage heating and sets both supply and exhaust fans to low speed (a field supplied and installed supply air duct stat is recommended to control a hot water zone valve). Additional signal to W2 engages second stage heating. The outdoor and exhaust air ventilation dampers close, recirculation defrost damper (with frost control option installed) opens, supply fan only runs in recirculation mode on high speed. On a call for freeze protection of the hot water coil from a freeze control temperature disc sensing the supply air entering the hot water coil, the outdoor and exhaust air ventilation dampers close, recirculation defrost damper (with frost control option installed) opens, supply fan only runs in recirculation mode on high speed and a signal is available to field connect to the hot water valve to open. Recirculation Defrost Recirculation defrost is engaged for a time-based 6 to 32 minute defrost to ventilation cycle from an internal thermostat when the outdoor air temperature drops below 23 F [ 5 C]. The exhaust fan is de-energized, the outdoor and exhaust air ventilation dampers close, recirculation defrost damper (with frost control option installed) opens and the supply fan runs in recirculation mode on high speed. Cooling Call Additional signal to Y1 engages first stage cooling. Supply fan is set to high speed, exhaust fan is off, outdoor and exhaust air dampers remain open. Additional signal to Y2 engages second stage cooling and both supply and exhaust fans are set to high speed, outdoor and exhaust air dampers remain open. VCES-VUV-IOM-1B HRV450w & HRV1000w 17

18 With the DX cooling option, the additional signal to Y2 energizes the connection to the remote condenser to provide DX cooling. On the HRV450w with DX cooling option, a fixed screened recirculation opening with a normally closed motorized damper (provided on the right supply side of the unit casing) will open. See Table G1, Recirc Open for DX Cooling column for airflow and ventilation information. On the HRV450w with the fixed recirculation option, a screened recirculation opening is provided on the right supply side of the unit casing to allow a portion of room air based on the supply external static pressure and to increase the total supply air delivered. See Table G1, Recirc Open for DX Cooling column for airflow and ventilation information. Unoccupied Mode With or Without Ventilation Call No signal to S1 engages unoccupied mode. Supply and exhaust fan motors are off. Outdoor and exhaust air ventilation dampers close. Recirculation defrost damper (with frost control option installed) opens. Heating Call (Electric Heating Units) Note: Supply fan runs for 90 seconds after heating call ends to cool the electric coils. First stage heating for electric heating units: On the HRV450w, first stage heating from the internal thermostat is disengaged. Supply and exhaust fans are off. Outdoor and exhaust air ventilation dampers close. Recirculation defrost damper (with frost control option installed) is opened. On the HRV1000w, on a call for first stage heating from the internal thermostat when the first stage heating switch is on, supply fan only runs in recirculation mode on low speed, the first stage of the electric coil is energized after a 90-second time delay. Additional signal to G and W1 engages the second stage of the electric coil after a 90-second time delay, supply fan only runs in recirculation mode on low speed. Additional signal to W2 engages the third stage of electric heat after a 90-second time delay, supply fan only runs in recirculation mode on high speed and second stage electric heating remains energized. If required, a field supplied baseboard heater or other heating unit can be interlocked to start. Heating Call (Hot Water Heating Units) Hot water controls are designed, supplied and installed by others. Consult with the Installing and/or Controls Contractor for controls and sequence for hot water heating. Signal to G and W1 engages first stage heating and sets supply fan to low speed (a field supplied and installed supply air duct stat is recommended to control a hot water zone valve). Additional signal to W2 engages second stage heating and sets supply fan to high speed. Cooling Call Additional signal to Y1 engages first stage cooling. On the HRV450w, first stage cooling is disengaged. The unit remains off. On the HRV1000w, a signal to G and Y1 engages first stage cooling. Supply fan is set to high speed, exhaust fan is off, outdoor and exhaust air dampers are open and recirculation defrost damper (with frost control option installed) closes. Additional signal to Y2 engages second stage cooling. Supply fan is set to high speed and exhaust fan is off. Outdoor and exhaust air ventilation dampers close. Recirculation defrost damper (with frost control option installed) remain open. With the DX cooling option, the additional signal to Y2 energizes the connection to the remote condenser to provide DX cooling. On the HRV450w with DX cooling option, a fixed screened recirculation opening with a normally closed motorized damper (provided on the right supply side of the unit casing) will open. See Table G1, Recirc Open for DX Cooling column for airflow and ventilation information. On the HRV450w with the fixed recirculation option, a screened opening is provided on the right supply side of the unit casing to allow a portion of room air based on the supply external static pressure and to increase the total supply air delivered. See Table G1, Recirc Open for DX Cooling column for airflow and ventilation information. VCES-VUV-IOM-1B HRV450w & HRV1000w 18

19 Controls Programmable Room Thermostat Heating, cooling and ventilation can be controlled by an optional remote seven-day programmable room thermostat. The wiring connections from the thermostat subbase to the unit control box terminals and initial setup instructions are shown in Appendix E. A separate information and programming package on the thermostat and sub-base is supplied with the unit. Ventilation may otherwise be remote controlled by switching R to FL or FH. Ventilation Rate Switch A three-position externally mounted ventilation rate switch located on the upper left side panel of the unit is included which can be used to manually select the fan speed to Low, Off or High. This switch is activated through terminal G and is also a system switch for an internal thermostat. Note: On the HRV450w, the ventilation rate switch switches both the supply and exhaust fan motors to Low, Off or High. On the HRV1000w, the ventilation rate switch switches the supply fan only to Low, Off or High ; the exhaust fan is single speed only. Note: This ventilation rate switch is not included with field supplied or BMS control of the unit. First Stage Heating Switch A two-position on/off externally mounted first stage heating switch located on the upper left side panel of the unit is included with electric heating which engages or disengages the function of the internal thermostat for first stage heating. Note: This first stage heating switch is not included with the hot water heating option, field supplied or BMS control of the unit. Internal Thermostats With electric heating, an internal on/off thermostat (T675A) with factory mounted sensor in the unit supply air entering the electric coil will engage first stage heating when the supply inlet temperature is below setpoint. The internal thermostat acts as a supply air temperature monitor and engages heating as necessary to pre-heat supply air before delivering it to the space being ventilated. The internal thermostat contacts R and B make a closure on temperature fall which will engage first stage heating when the supply air temperature falls below its factory setpoint of 59 F [15 C] (actual 55 F [12.8 C] with differential set at two). For proper environment conditions, the temperature of the supply air diffused should be no lower than 55 F [12.8 C]. The function of this thermostat is disabled when the external first stage heating switch is set to Off. The operation of this thermostat is given in Appendix H. With proportional electric heating, an additional internal modulating thermostat (T991A) with sensor mounted in the supply air discharge downstream of the electric coil and connected to an SCR will modulate first stage heating to maintain a supply air discharge temperature leaving the electric coil when the internal on/off thermostat entering the electric coil calls for heating. Note: These internal thermostats are not included with the hydronic heating option, field supplied or BMS control of the unit. High Temperature Limit Control Manual reset high temperature limits are internally mounted on the electric coils and wired to break contact to the heating elements when the temperature rise across the heating elements becomes excessive. This may be due to blocked filters, blocked energy recovery module, blocked ducting, fan failure or fan relay failure. See the Maintenance section for proper equipment maintenance. Frost Control Recirculation defrost control cycle is electronically controlled in response to the outside air temperature. Defrost control is initiated in ventilation (occupied) mode at an outdoor air temperature below 23 F [ 5 C]. On a call for defrost, the outside air damper closes, the exhaust fan is de-energized, the exhaust damper closes, the recirculation defrost damper opens and the supply fan circulates warm air through the flat plate heat exchanger to remove the buildup of ice. Defrost/ventilation cycle is time- and temperature-based at 6/32 minutes defrost/ventilation. Non-defrost control can be used only in areas where the winter outdoor air condition stays above 23 F [ 5 C] and the return air humidity level is below 20%. Freeze Control Temperature Disc A bi-metallic auto reset temperature disc, provided with hot water heating units to prevent the hot water coils from freezing up, is factory mounted between the supply fan discharge and the coil and wired to the terminal strip. This temperature disc must be field connected to the zone valve that controls the hot water flow to the coil. When the temperature in the supply air to the coil goes below its temperature rating, the disc closes its contacts to engage the flow through the coil to prevent it from freezing. See the wiring diagram on the unit control box cover for wiring connections. VCES-VUV-IOM-1B HRV450w & HRV1000w 19

20 Remote Wall Mounted CO2 Ventilation Control (Accessory Item or Field Supplied) The units can be connected to a remote wall mounted CO 2 ventilation control that will switch the fan speed from Low to High (providing the unit is not selected or the ventilation rate switch is not set at high speed/high volume). As the CO 2 levels exceed acceptable limits, the dry contact closes, raising high speed fan ventilation. See Appendix E for field wiring connection details. A separate information package on the CO 2 ventilation control is included. Modulating Motor and Valve (Accessory Item or Field Supplied) A three-way control valve with a modulating actuator assembly is available to control the fluid flow to the heating coils and supply air temperature from the HRV wall unit The design of the hot water piping lines, components, electric controls, interlocks and sequence of control is by others. A separate power supply is required for hot water heating controls. All control wiring should be low voltage. A separate information package on the modulating motor and valve is included. The three-way modulating control valve assembly consists of: A 24 VAC NEMA 2 modulating actuator with a temperature rating of 22 F to 122 F [ 30 C to 50 C], 2 to 10 VDC or 4 to 20 ma operating range, with a 3 cable. A ¾ FPT, three-way, nickel plated forged brass hydronic valve with stainless steel ball, stem and replaceable valve cartridge assembly, intended for use in a normal indoor environment for hot or cold water or glycol solutions to 60% concentration, with a Cv factor of 4.7, with a medium temperature rating of 0 F to 250 F [ 18 C to 120 C], and a maximum differential pressure rating of 50 psi, close off pressure rating of 200 psi and maximum body pressure rating of 600 psi. Airflow Balancing Once installed, the unit must operate with balanced ventilation. Balanced ventilation is achieved by obtaining equal rates of supply and exhaust airflow. Airflow may be adjusted by changing the fan motor speeds (see Table 4) or by adjusting the external resistance (ESP) as per Appendix G within the supply and/or exhaust ductwork. Systems that are not operating with balanced airflow will not have effective energy recovery. Performance of the heat recovery module will be reduced and freezing may occur with cold outside air temperatures, resulting in blockage of the heat recovery module. Figure 2: HRV1000w recirc panel position On the HRV450w, when the outdoor and exhaust air ventilation dampers are open, the supply air is 100% outdoor air. With the fixed recirculation option, a portion of recirculated room air to outdoor air is provided based on supply external static pressure. See Appendix G for airflow and ventilation information. On the HRV1000w, when the outdoor and exhaust air ventilation dampers are open, the supply air is a mixture, with a percentage of return air to outdoor air provided based on fixed positions of an internal recirc panel. See Appendix G for airflow and ventilation information. The internal recirculation panel has four hold down screw positions that can be adjusted on site as shown in Figure 2. VCES-VUV-IOM-1B HRV450w & HRV1000w 20

21 Maintenance Monthly Maintenance WARNING Disconnect the main power switch to the unit before performing service and maintenance procedures. Figure 4: HRV1000w exhaust filter See Appendix A for equipment data on units, Appendix B for component locations and Appendix I for troubleshooting information. A more detailed description of major maintenance items and time frames follows. Please refer to Appendix J for a recommended list of routine maintenance items and time intervals. Air Filters HRV450w The standard washable black foam filters should be cleaned monthly or as required by operating conditions. The optional (accessory item) medium efficiency filters are disposable and should be replaced monthly or as required by operating conditions. To remove the filters, simply remove the top access door and slide the filter out of the guide (see Figure 3). When installing a new filter, the airflow arrow should point in the direction of the heat exchanger. Figure 5: HRV1000w supply filter Figure 3: HRV450w exhaust filter (supply filter is on the left side) HRV1000w The standard medium efficiency filters are disposable and should be replaced monthly or as required by operating conditions. When installing a new filter, the airflow arrow should point in the direction of the heat exchanger. To remove the HRV1000w filters, simply remove the bottom access door and slide the filter out of the guide. VCES-VUV-IOM-1B HRV450w & HRV1000w 21

22 Annual Maintenance WARNING Disconnect the main power switch to the unit before performing service and maintenance procedures. Drain Pans and Interior of Unit The inside of the unit, including drain pans (if equipped), should be wiped clean annually with a soft cloth and mild cleaning solution. Check the drain fittings (if equipped) to ensure they are draining freely. Plate Heat Exchanger To remove the exhaust blower, the control box has to be removed. Disconnect the electrical plugs from the control box and remove the four screws holding it in place to expose the exhaust blower. Remove the two wing screws and slide the exhaust blower out. Figure 6: Remove wing screws on supply blower CAUTION Hot water and strong cleaning agents could damage the heat exchanger. Ensure the heat exchanger is returned to the unit in the correct orientation. Failure to do so may result in damage to the exchanger. Follow instructions on the label. The flat plate heat exchanger must be handled with care. Remove the flat plate heat exchangers by sliding them out from the tracks holding them in place. In order to ensure maximum efficiency of the partitions, it is recommended that the heat exchanger be cleaned once a year following the season of most intense use. For polypropylene and aluminum media, allow the heat exchanger to soak for three hours in warm water and mild soap. Rinse under a heavy stream of water. When replacing the flat plate heat exchanger sections, ensure they are of the proper vertical orientation. Failure to do so may result in low airflow on the exhaust airstream due to system pressure trapping or holding condensate in the flutes. Heaters/Air Conditioning Coils Check the duct heaters, hot water coils and air conditioning coils for obstruction or buildup of dust. Check the manual reset button on your duct heaters (if unit has electric heat). If the red buttons are released out, depress the red button to reset the switch. If this problem persists, call your local technician. Dampers Check inside dampers for obstruction and cleanliness. Fans Blower wheels and fan housings should be checked for dust buildup. If excessive dust buildup exists, it will be necessary to remove the blower assembly to clean the dust out through the fan mouth. To remove the supply blower, first remove the two screws holding the blower in place, disconnect the electrical plug and slide the blower out of the unit. Figure 7: Disconnect electrical plugs Figure 8: Remove supply blower VCES-VUV-IOM-1B HRV450w & HRV1000w 22