Installation and Start-Up Instructions

Transcription

1 52VCR,VER,VQR,VWR09-24 Vertical Packaged Terminal Air Conditioners Cooling Only Units, Heat Pump Units, Electric Heat Units, and Hot Water Heat Units Installation and Start-Up Instructions CONTENTS Page SAFETY CONSIDERATIONS GENERAL INSTALLATION Step 1 Complete Pre-Installation Checks EXAMINE THE UNIT UNIT STORAGE Step 2 Place Unit UNIT LOCATION CLOSET DIMENSIONS Step 3 Install Wall Sleeve Step 4 Install Unit in Wall Sleeve Step 5 Complete Electrical Connections Step 6 Install Condensate Drain Step 7 Install Air Filter Step 8 Check Blower Motor Speed START-UP ,11 MAINTENANCE ,12 SAFETY CONSIDERATIONS Installing, starting up, and servicing air-conditioning components and equipment can be dangerous. Only trained, qualified installers and service mechanics should install, start up, and service this equipment. When working on the equipment, observe precautions in the literature and on tags, stickers, and labels attached to the equipment. Follow all safety codes. Wear safety glasses and work gloves. WARNING Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury. WARNING Electric shock hazard can cause injury or death. More than one disconnect switch may be required to deenergize this equipment. Open all disconnects before servicing. Puron refrigerant (R-410A) systems operate at higher pressures than standard R-22 systems. Do not use R-22 service equipment or components on Puron refrigerant equipment. If service equipment is not rated for Puron refrigerant, equipment damage or personal injury may result. Use care in handling, rigging, and setting equipment. Damage to unit could result. Do not operate unit during building construction due to excessive airborne dust and debris. Do not operate equipment at any time without air filters in place. Damage to unit will occur. WARNING DO NOT USE TORCH to remove any component. System contains oil and refrigerant under pressure. To remove a component, wear protective gloved and goggles and proceed as follows: a. Shut off electrical power to unit. b. Recover refrigerant to relieve all pressure from system using both high-pressure and low pressure ports. c. Traces of vapor should be displaced with nitrogen and the work area should be well ventilated. Refrigerant in contact with an open flame produces toxic gases. d. Cut component connection tubing with tubing cutter and remove component from unit. Use a pan to catch any oil that may come out of the lines and as a gage for how much oil to add to the system. e. Carefully unsweat remaining tubing stubs when necessary. Oil can ignite when exposed to torch flame. Failure to follow these procedures may result in personal injury or death. DO NOT re-use compressor oil or any oil that has been exposed to the atmosphere. Dispose of oil per local codes and regulations. DO NOT leave refrigerant system open to air any longer than the actual time required to service the equipment. Seal circuits being serviced and charge with dry nitrogen to prevent oil contamination when timely repairs cannot be completed. Failure to follow these procedures may result in damage to equipment. GENERAL The 52V indoor packaged units are flexible for a variety of applications. These self-contained units are available as cooling only units, heat pump units, cooling with electric heat units, and cooling with hot water heat units. The 52V unit is shipped in one package, completely assembled. Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No Printed in U.S.A. Form 52V-3SI Pg Replaces: 52V-2SI

2 INSTALLATION The 52V units are intended for indoor installation only. Determine building alterations required to run piping, wiring, and ductwork. Read all installation instructions before installing the unit. Step 1 Complete Pre-Installation Checks EXAMINE THE UNIT Examine the unit for shipping damage. File a claim with the transit company if damage is found. Check the shipment for completeness. Verify that the nameplate electrical requirements match the available power supply. Material in the shipment has been inspected at the factory and released to the transportation agency in good condition. When received, a visual inspection of all cartons should be made immediately. Any evidence of rough handling or apparent damage should be noted on the delivery receipt and the material inspected in the presence of the carrier s representative. If damage is found a claim should be filed against the carrier immediately. The following items are packed inside the unit: 1 Filter bracket 1 Filter clip UNIT STORAGE The 52V units are designed and packaged for indoor storage and use only. If the equipment is not needed for immediate installation upon its arrival at the job site, it should be left in its shipping carton and stored in a clean, dry area. Units must only be stored or moved in the normal upright position at all times. DO NOT STACK UNITS. Step 2 Place Unit Use proper lifting and handling practices to avoid damage to the unit. Refer to Fig. 1-3 for unit dimensions. See Table 1 for physical data. UNIT LOCATION Locate the unit in an indoor area that allows easy removal of the filters, access panels, and accessories. Make certain enough space is available for service personnel to perform maintenance or repairs. Provide sufficient room to make all water, duct, and electrical connections. If the unit is located in a closet, make sure adequate space is available for air to return freely to the unit. The 52V units are designed for through-the-wall installation. The interior portion of the unit is surrounded by a closet with a rear access. See Fig. 4. The vertical discharge allows for ducting to the top of the room for best air circulation and elimination of cold drafts on occupants. The exterior (grille side) of the unit must have no obstructions (trees, landscape materials, etc.) within 18 inches. Do not locate two units adjacent to each other on an inside corner or where they may exhaust into each other. Provisions should be made to allow access to the indoor side of the unit for installation and inspection. The closet or access panel opening must be centered with the exterior wall opening and be at least 24-in. wide by 84-in. tall. At least 3-in. of unobstructed space is required on all sides of the unit to allow for adequate airflow. At least 27-in. of unobstructed space should be provided in front of the access door. See Fig. 4. CLOSET DIMENSIONS Ensure that the floor is structurally strong enough to support the weight of the equipment with minimum deflection. A good, level floor is required for proper unit operation. For a rear closet installation, the sleeve rough-in opening is 44-in. (height) x 21 5 / 8 -in. (width). The bottom of the opening should be approximately 6-in. above the floor level. A minimum of 3-in. of clearance is required on all sides of the unit. See Fig. 5 and 6. For a rear closet installation, to find the minimum closet depth (dimension C in Fig. 6), use the following method to determine dimension A which is the total finished wall thickness. For 5 to 8-in. outside wall thickness, subtract A from 29 in. ( C = 29 A ). For 8 to 12-in. outside wall thickness, subtract A from 33 in. ( C = 33 A ). For 12 to 15-in. outside wall thickness, subtract A from 36 in. ( C = 36 A ). Table 1 Physical Data UNIT SHIPPING WEIGHT (lb) VCR VER VQR VWR For side closet installation, the sleeve rough-in opening is 44-in. (height) x 21 5 / 8 -in. (width). The bottom of the opening should be approximately 6-in. above the floor level. A minimum of 3-in. of clearance is required on the sides of the unit and 12-in. of clearance is required for the rear of the unit. See Fig. 7. For side closet installation, to find the minimum closet depth (dimension C in Fig. 7), use the following method to determine dimension A which is the total finished wall thickness. For 5 to 8-in. outside wall thickness, subtract A from 39 in. ( C = 39 A ). For 8 to 12-in. outside wall thickness, subtract A from 43 in. ( C = 43 A ). For 12 to 15-in. outside wall thickness, subtract A from 46 in. ( C = 46 A ). Step 3 Install Wall Sleeve Wall sleeve must be installed before unit installation. Make sure sleeve components are not damaged and that the drain line is unobstructed and leak free. Check all seals to ensure that they are in position and undamaged. Use a level to ensure that the bottom of the wall sleeve is pitched one half bubble toward the outside of the building so that rain water will drain to the outside. Securely fasten the architectural grille to the front of the sleeve using the supplied hardware. After sleeve installation ensure that the sleeve seal is in contact with the sleeve sides. Any air gaps must be sealed or outdoor air and/or water leakage will occur. Make sure a high grade non-hardening sealant approved for exterior use has been applied between edge of the sleeve and the structure, on the inside and outside walls, to prevent air and water from migrating inside. 2

3 UNIT DIMENSIONS 52VCR, (in.) VER A B 09,12, / / NOTE: Dimensions are in inches. DUCT OPENING 1 ELEMENT BLOWER A B FILTER /8 RETURN AIR SERVICE PULLOUT 66 ELECTRICAL KNOCKOUT a CONDESER OUTLET INLET 41 1 /4 LOW VOLTAGE Fig. 1 52VCR,VER09-24 Cooling Only and Cooling Only with Electric Heat Unit Dimensions DIMENSIONS UNIT (in.) 52VQR A B 09,12, / / DUCT OPENING 1 A ELEMENT BLOWER B FILTER /8 RETURN AIR NOTE: Dimensions are in inches. SERVICE PULLOUT a CONDESER OUTLET 66 ELECTRICAL KNOCKOUT 41 1 /4 LOW VOLTAGE INLET Fig. 2 52VQR09-24 Heat Pump Unit Dimensions 3

4 a DUCT OPENING /4 1 1 / / /4 HOT WATER INLET (1) HOT WATER COIL RETURN AIR BLOWER FILTER SERVICE PULLOUT 71 1 /4 ELECTRICAL KNOCKOUT OUTLET LOW VOLTAGE 41 1 /4 INLET NOTES: 1. Hot water coil connections are 7 / 8 -in. O.D. sweat. 2. Dimensions are in inches Fig. 3 52VWR09-24 Hot Water Heat Unit Dimensions a CLOSET a GRILLE WIDTH 22-in. BUILDING EXTERIOR 2-in. MIN 52V UNIT UNIT MUST LINE UP WITH DOOR FOR REMOVAL Fig. 5 Rear Closet Installation Details 27-in. MIN a Fig. 6 Closet Dimensions for Rear Installation Fig. 4 Typical Closet Installation Location (Cooling Only Unit Shown) 4

5 27-in. MIN WALL SLEEVE 52V UNIT 12-in. MIN OUTSIDE WALL C 30-in. MIN Step 4 Install Unit in Wall Sleeve Ensure that properly sized ductwork is in place to mate to the supply connection on the unit. Perform the following procedure to install the 52V unit. Wall sleeve must be installed prior to installation of the unit. IMPORTANT: There must be a minimum 3-in. clearance maintained around the unit chassis on all sides for adequate airflow to achieve optimum performance. These guidelines give minimum spacing requirements only. There is no maximum limit. 1. Remove the two clips holding the unit to the shipping pallet and remove unit from the shipping pallet. 2. Before setting unit into closet and/or wall sleeve, remove upper side access panels and inspect the evaporator blower to ensure that the wheel turns freely without rubbing on the housing. Remove the styrofoam shipping block supporting the blower assembly. Replace upper access doors. 3. Remove the disconnect and the rear access door for access to the filter bracket and filter clip. Remove items. Check the condenser fan to see that it turns freely. A a Fig. 7 Closet Dimensions for Side Installation 4. The unit is equipped with bend out flanges (see Fig. 8), next to the evaporator coil, for the purpose of attaching a return air duct. If ducted return air is required, these flanges must be bent 90 degrees away from the face of the evaporator coil along the perforations for installation. If the unit will not be connected to a fixed return duct, these flanges must be broken off of the unit. 5. If an air filter is to be applied to the unit, install the filter bracket by inserting the tab portion of the rack between the insulation and middle plate under the drain pan. See Fig. 8. Place a field-supplied 20 x 24 x 1-in. filter into the filter rack. Insert the two tabs on the filter clip into the slots above the evaporator and hook the front flange under the filter flange to hold the filter in place. 6. A fresh air make up vent is located on the lower left side door. See Fig. 8. Remove one screw and rotate the plate to expose the desired amount of vent opening. Replace the screw to hold the door in desired location. 7. Ensure that the wall sleeve is installed squarely and is secure before placing the unit in the sleeve. After removing the construction debris guard, check the bottom of the pan. Use a level to ensure that it is sloped one half bubble toward the outside. Ensure that the bottom of the pan and drain are clear of obstruction and operational. Water damage to building may result. 8. Remove the construction debris guard. Inspect the sleeve seal, which is supplied with the sleeve, to ensure that it is properly secured and aligned. See Fig. 9. Use a high grade non-hardening sealant to close any gaps that may exist between the seal and the wall of the sleeve. a FILTER BRACKET DUCTED RETURN AIR FLANGES AIR FILTER THERMOSTAT CONNECTION FRESH AIR VENT ELECTRICAL DISCONNECT FILTER RETAINER Fig. 8 Filter Bracket Details (Cooling Only Unit Shown) 5

6 APPROXIMATE FASTENER LOCATIONS ARCHITECTURAL GRILLE ELECTRICAL DISCONNECT REAR ACCESS PANEL WALL SLEEVE SEALS WALL SLEEVE DRAIN TO OUTSIDE ELECTRICAL SERVICE KNOCK-OUT a Fig. 9 Unit Installation into Wall Sleeve 9. After the seal is inspected, lift the unit onto the base of the sleeve and slide the unit forward to engage the seal. The unit is fully engaged when the upper housing of the unit is 1/ 2 -in. away from the top inside edge of the sleeve. Check that the unit is completely seated on all four sides against the wall sleeve seals. If necessary, seal any openings that may exist. If unit is not sealed completely, water and/or outside air will infiltrate into the closet. Damage to the building or unit may occur. 10. Install ductwork onto unit discharge and ensure that the connection is leak free. A flexible boot connection may be desirable to provide for more convenient installation and removal of the unit. 11. For 52VWR units only, connect hot water piping to unit. The hot water coil connections are 7 / 8 -in. OD sweat type. 12. Replace the rear access panel and unit disconnect. Step 5 Complete Electrical Connections All wiring must comply with local and national code requirements. Any alteration of the internal wiring will void UL (Underwriters Laboratories) certification and manufacturer s warranty. Electrical data is shown in Tables 2A-2C. Nameplate data indicates the operating voltage, phase, ampacity, maximum over current protection and minimum voltage. Units must never be installed or operated where voltage exceeds the nameplate voltage by more than 10%. Failure of the compressor as a result of operation with improper voltage voids the compressor replacement warranty. The unit comes with a factory-supplied disconnect, however, the contractor is responsible for providing overcurrent protection on the branch circuit. Refer to the unit wiring diagram for single point electrical connection. These units are provided with a Class 2 transformer for 24-v control circuits. Should any add-on equipment also have a Class 2 transformer furnished, care must be taken to prevent interconnecting outputs of the two transformers by using a thermostat with isolating contacts. Connect properly sized electrical service to the disconnect block. Install a factory approved or equivalent thermostat according to directions furnished with the thermostat. The thermostat should be located on an inside wall where it will not be affected by drafts, sunlight or any other heat producing appliances. Connect thermostat wires to the thermostat following the wiring diagram attached to the unit. See Fig. 10 for a typical unit wiring diagram. The 52VQR heat pump units operate with the reversing valve energized in the Heating mode. The thermostat must be wired or configured accordingly or the unit will not operate properly. Damage to the unit may occur. Step 6 Install Condensate Drain The unit is designed so that the wall sleeve is the principal drain pan. Drain tubing is factory installed in the unit which drains the evaporator condensate through the bottom of the unit. This is then allowed to drain into the wall sleeve pan. When preparing unit for installation, check to ensure that the bottom of the drain tube from the evaporator has been secured to form a trap at the bottom of the condenser section. The 6

7 wall sleeve has a 3 / 4 -in. NPT nipple located in the bottom for connection to a drain. See Fig. 9. A trap may be required in the condensate drain line to prevent sewer gas from escaping into the room. Prior to unit installation ensure that the drain is unobstructed and leak free. Step 7 Install Air Filter All indoor return air must be filtered. The preferred methods are to use the factorysupplied filter kit or to install a filter return grille in the wall. A factory-supplied filter kit attaches to the inlet of the evaporator and accepts a 20 x 24 x 1-in. field-supplied throwaway type filter. A filter kit supplied with the access panel accepts a 20 x 20 x 1-in. throwaway type filter. A filter can be installed in the return grille that is mounted in the wall. Any field installation of an air filter must provide for the use of a disposable filter which is no smaller than the face area of the evaporator coil. The air filter should be cleaned or replaced every 30 days or more frequently if severe conditions exist. Step 8 Check Blower Motor Speed The unit contains a direct drive, multi-speed blower. The proper speeds have been preset at the factory for heating and cooling. Refer to the unit wiring diagram for recommended blower speeds for specific models. See Tables 3A-3C. YEL YEL COMPRESSOR C R S COND CAP EVAP HEATER 1 BLK RED BLK YEL YEL BRN BLK BLK CAP OFF ANY UNUSED SPEED TAPS ORG L1 H C F YEL BLK RED BLU L1 HTR2 COMP COND EVAP LO EVAP HI YEL L2 L2 L2 HTR1 L1 L2 GRD L1 208/240 V- 1 PH - 60 HZ POWER SUPPLY L2 DISCONNECT L1 L1 RV RV COM GND COM R G Y W2 O A FACTORY SUPPLIED JUMPER IS PLACED BETWEEN FD AND RC AND MUST BE REMOVED WHEN INSTALLING THE FRONT DESK SWITCH BLK FD RC RS COOLING LOCKOUT OUTDOOR DEFROST INDOOR GRN BRN GRN WHT BLU GRAY BRN FACTORY WIRING 1 AMP 250 V FUSE RED BRN FIELD WIRING C R G Y W2 C LEAD MAY BE REQUIRED FOR ELECTRONIC THERMOSTATS 24 V CLASS 2 WIRING R G Y W 24 V REMOTE THERMOSTAT FRONT DESK SWITCH (OPTIONAL) FIELD-INSTALLED LO TEMP LOCKOUT (NO) EVAPORATOR FROST SENSOR (NO) Fig. 10 Typical Unit Wiring Diagram (52VER Unit Shown) 7

8 UNIT SIZE BLOWER DATA Table 2A Electrical Data 52VCR,VER UNITS (208/230 V-1 Ph-60 Hz) DATA ELECTRIC HEAT DATA Total MCA MOCP Evaporator Compressor Condenser Motor Motor Heater kw Heating Type Amps Amps Hp RLA LRA FLA Hp 230v 208v 230v 208v 230v 208v 230v 208v ,800 5, / / ,200 7, ,600 10, / / / / / / ,800 5, ,200 7, ,600 10, ,350 11, ,200 7, ,600 10, ,350 11, ,500 15, ,300 20, ,700 23, ,200 7, ,600 10, ,350 11, ,500 15, ,300 20, ,700 23, UNIT SIZE BLOWER DATA Evaporator Motor LEGEND FLA Full Load Amps HP Horsepower LRA Locked Rotor Amps MCA Minimum Circuit Amps MOCP Maximum Overcurrent Protection RLA Rated Load Amps Table 2B Electrical Data 52VQR UNITS (208/230 V-1 Ph-60 Hz) DATA Condenser Motor ELECTRIC HEAT DATA Total Heating Amps Compressor Heater kw Type Amps Hp RLA LRA FLA Hp 230v 208v 230v 208v 230v 208v 230v 208v / / ,200 7, ,800 5, ,600 10, / / / / / / 8 MCA MOCP ,800 5, ,200 7, ,600 10, ,350 11, ,200 7, ,600 10, ,350 11, ,500 15, ,300 20, ,700 23, ,200 7, ,600 10, ,350 11, ,500 15, ,300 20, ,700 23,

9 LEGEND FLA Full Load Amps HP Horsepower LRA Locked Rotor Amps MCA Minimum Circuit Amps MOCP Maximum Overcurrent Protection RLA Rated Load Amps Table 2C Electrical Data 52VWR UNITS (208/230 V-1 Ph-60 Hz) BLOWER UNIT SIZE DATA DATA MCA MOCP Evaporator Condenser Motor Compressor Motor Amps Hp RLA LRA FLA Hp 230v 208v 230v 208v / / / / / / UNIT SIZE * This speed setting is hard-wired at the factory. To change the speed setting, the installer must rewire the terminals on the motor. An H next to the speed setting indicates the factory speed setting Table 3A Fan Performance (cfm) 52VCR,VER Units EXTERNAL STATIC PRESSURE (in. wg) SPEED SETTING* HIGH MEDIUM LOW (C) (H) HIGH MEDIUM (C) LOW (H) HIGH MEDIUM (C) LOW (H) HIGH MEDIUM (C) LOW (H) for heating mode. A C next to the speed setting indicates the factory speed setting for cooling mode. UNIT SIZE * This speed setting is hard-wired at the factory. To change the speed setting, the installer must rewire the terminals on the motor. An H next to the speed setting indicates the factory speed setting Table 3B Fan Performance (cfm) 52VQR Units EXTERNAL STATIC PRESSURE (in. wg) SPEED SETTING* HIGH MEDIUM LOW (C) (H) HIGH MEDIUM (C) LOW (H) HIGH MEDIUM (C) LOW (H) HIGH MEDIUM (C) LOW (H) for heating mode. A C next to the speed setting indicates the factory speed setting for cooling mode. 9

10 UNIT SIZE (2-Row Coil) 18 (3-Row Coil) 24 (2-Row Coil) 24 (3-Row Coil) * This speed setting is hard-wired at the factory. To change the speed setting, the installer must rewire the terminals on the motor. An H next to the speed setting indicates the factory speed setting Table 3C Fan Performance (cfm) 52VWR Units EXTERNAL STATIC PRESSURE (in. wg) SPEED SETTING* HIGH (C) MEDIUM (H) MEDIUM (C) LOW (H) MEDIUM (C) LOW (H) HIGH (C) MEDIUM (H) HIGH (C) MEDIUM (H) for heating mode. A C next to the speed setting indicates the factory speed setting for cooling mode. START-UP General Operation of the unit is automatic and the unit will provide heating and cooling depending on the setting of the thermostat. NOTE: Loosen compressor mounting nuts if unit vibration is excessive. WARNING All panels must be installed and disconnect switch must be in place before operating unit. Electric shock or death could result. System Check COOLING ONLY AND COOLING WITH ELECTRIC HEAT UNITS (52VCR,VER) To check unit operation, perform the following: 1. Set thermostat system switch to the Off position and fan switch to Auto position. Apply power to the unit. NOTE: The 52VCR,VER units employ a random reset timer which delays unit operation up to 3 minutes following initial power application. Electronic thermostats may also employ internal reset timers which may further delay any changes which are made to the operation of the unit. 2. Set fan switch to On. The indoor blower should operate after the reset timer cycle is complete. 3. Return fan switch to Auto. The indoor blower should deenergize. 4. Set the system switch to Cool and lower the thermostat set point to the coldest setting. The compressor should energize as well as the outdoor fan and indoor blower. 5. Return the thermostat set point to a temperature warmer than room temperature. The compressor and outdoor fan should deenergize. The indoor blower should remain in operation for an additional 45 seconds, then deenergize. The 52VCR,VER units employ a compressor short cycle delay (around 3 minutes) which will not allow the compressor to immediately restart following shut down. Additional delays may be experienced if using an electronic digital thermostat. 6. Move system switch to Heat and raise thermostat to a set point higher than room temperature. The indoor blower and electric heating element(s) should energize. 7. Return the system switch to the Off position. NOTE: The 52VCR,VER units feature a low ambient compressor lockout switch which will not let the compressor energize in Cooling mode when the outdoor ambient temperature is below 40 F. HEAT PUMP UNITS (52VQR) To check unit operation, perform the following: 1. Set thermostat system switch to the Off position and the fan switch to the Auto position. Apply power to the unit. NOTE: The 52VQR unit employs a random reset timer which delays unit operation up to 3 minutes following initial power application. Electronic thermostats may also employ internal reset timers which may further delay any changes which are made to the operation of the unit. 2. Set fan switch to On. The blower should operate after the reset timer cycle is complete. 3. Return the fan switch to Auto. The blower should deenergize. 4. Set the system switch to Cool and lower thermostat set point to coldest setting. The compressor should energize as well as the outdoor fan and indoor blower. 5. Return the thermostat set point to a temperature warmer than room temperature. The compressor and outdoor fan should deenergize. The indoor blower should remain in operation for an additional 45 seconds, then deenergize. NOTE: The 52VQR employs a short cycle delay (about 3 minutes) which will not allow the compressor to immediately restart following shut down. Additional delays may be experienced if using an electronic digital thermostat. 6. Move the system switch to Heat and raise thermostat to a set point slightly higher than room temperature (less than 2 degrees higher). The compressor, outdoor fan, and indoor blower should energize. 7. Raise set point to more than 2 degrees higher than room temperature and the electric heaters should energize. The compressor and condenser fan will immediately deenergize. The compressor will remain locked out and the electric heat will continue operating until the thermostat is satisfied. NOTE: The 52VQR units employ a compressor lock out which will not allow the compressor and electric heaters to energize at the same time. 8. Lower the set point to less than room temperature and the system should deenergize. 9. Return the system switch to the Off position. 10

11 COOLING WITH HOT WATER HEAT UNITS (52VWR) To check unit operation, perform the following: 1. Set thermostat system switch to the Off position and fan switch to Auto position. Apply power to the unit. NOTE: The 52VWR units employ a random reset timer which delays unit operation up to 3 minutes following initial power application. Electronic thermostats may also employ internal reset timers which may further delay any changes which are made to the operation of the unit. 2. Set fan switch to On. The indoor blower should operate after the reset timer cycle is complete. 3. Return fan switch to Auto. The indoor blower should deenergize. 4. Set the system switch to Cool and lower the thermostat set point to the coldest setting. The compressor should energize as well as the outdoor fan and indoor blower. 5. Return the thermostat set point to a temperature warmer than room temperature. The compressor and outdoor fan should deenergize. The indoor blower should remain in operation for an additional 45 seconds, then deenergize. The 52VWR units employ a compressor short cycle delay (around 3 minutes) which will not allow the compressor to immediately restart following shutdown. Additional delays may be experienced if using an electronic digital thermostat. 6. Move system switch to Heat and raise thermostat to a set point higher than room temperature. The indoor blower should energize and hot water valve should open. 7. Return the system switch to the Off position. NOTE: The 52VWR units feature a low ambient compressor lockout switch which will not let the compressor energize in Cooling mode when the outdoor ambient temperature is below 40 F. MAINTENANCE Periodic maintenance is limited to: replacing the air filter monthly or more frequently if unusual conditions are encountered cleaning the outdoor coil of foreign material such as lint, dust, leaves or other obstructions as necessary checking drain line and removing obstructions as necessary. IMPORTANT: It is illegal to discharge refrigerant into the atmosphere. Use proper reclaiming methods and equipment when installing or servicing this unit. Service should be performed by a QUALIFIED service agency. The refrigerant system contained in the unit normally requires no maintenance since it is a closed, self-contained system. If servicing or major repairs are required, the complete unit can be removed as follows: 1. Disconnect the electrical power circuit supplying the unit. 2. Remove the disconnect and low voltage thermostat connector. 3. Remove rear access panel. 4. Remove the supply duct from top of unit. 5. Slide unit out of sleeve. 6. Unit may now be removed from closet. To reinstall unit, reverse the procedure outlined above. General Maintenance Perform the following checks annually. Check wall sleeve and ensure mount integrity. Check wall sleeve to ensure that the base is pitched forward sufficient to force rain water to flow to the outside. Check seal between the wall sleeve and the wall to ensure that there is no air or water leakage. Check to ensure that the unit is fully engaged into the wall sleeve and that all seals are intact and there is no air or water leakage. Check inside of unit and remove dirt and contaminants (including bird nests and insect infestations) which may cause interference with unit operation. Check unit base, wall sleeve and other outdoor exposed surfaces for corrosion. Prep and paint or replace parts as required. This step is critical to prevent staining to the exterior surface of the building. Check unit and wall sleeve to ensure structural integrity. Inspect supply and return air connections for tightness and alignment. Functional Testing Perform the following checks annually. ALL UNITS Run system through both heating and cooling cycle. Check for proper sequence and performance. Check total amperage draw against nameplate for minimums as well as maximums. HEAT PUMP UNITS Check reversing valve for proper operation. Inspect coil for evidence of cracks in the plastic case and replace as required. Check crankcase heater (if applicable). Check heater case and connections for cracks or corrosion and replace as required. Check that the heater is functioning properly. Inspect accumulator joints and body for corrosion which can cause vessel failure. Replace as required. Compressor Perform the following checks annually. Check wiring connections. Check wires and connections for evidence of arcing, overheating and deterioration. Replace wires and/or connectors as required. Check running amps against nameplate information. Check mounting feet for secure compressor mounting. Replace as required. Check refrigerant connection for leaking, tightness of fittings or corrosion. Use a halogen detector or similar device. Coils Perform the following checks annually. Clean coils by brushing, blowing, vacuuming or pressure washing. Use an industry name brand NON-ACID coil cleaner as necessary. Check fins for damage. Use a fin comb to straighten and smooth damaged or bent fins. Check refrigerant connection piping for leaks, tightness of fittings or corrosion. Use a halogen detector or similar device. 11

12 Motor, Blower and Fans Perform the following checks annually. Inspect mount for damage, cracks or corrosion. Ensure all bolts are in place and tightened. Check motor running amps against nameplate information. Check capacitors for proper sizing relative to motor nameplate. Check for noise and worn bearings. Repair or replace as required. Check fan blade/blower wheel hub set screw for tightness. Spin fans to make sure that there is no binding or interference. Clean fans to ensure balanced operation. Check blades or any moving part for cracks or excessive wear. Check blades for dust or any foreign material build-up and clean if needed. Drain Pan and Condensate Removal Perform the following checks annually. Check the drain pan for foreign materials that could block proper drainage. Clean as necessary. Check that condensate and p-trap piping is clear and open to flow. Blow out or chase the piping with a suitable clearing device to ensure flow. Check piping integrity for condition and serviceability. Check to see that a positive downward slope exists with the piping between the wall sleeve drain pan and where it empties. Check drainage by pouring water into the pan and verifying operation. Check drain pan for detrimental rust, leaks and proper insulation to prevent sweating. Replace if necessary. Check for pan structural integrity. Heavy flaking rust indicates need for pan replacement. Treat drain pans with an EPA approved biocide as conditions warrant. If present check safety switches for proper operation. Drain pan should be replaced every 8 years. Electrical Components Perform the following checks annually. In wiring compartment, check electrical connections for tightness. Check all components for evidence of arcing, overheating or deterioration. Replace if necessary. Check components for proper mounting and tightness. Check all relays for proper operation. Replace as needed. Check the cabinet ground connection for tightness and presence of corrosion. Clean if necessary. Check resistance heating coil (if installed). Check resistance heating coils for open circuits by isolating one of the wire feeds attached to the ceramic terminals. Replace if necessary. Check the thermal cutout switches and fuses for open circuits, replace if necessary. Check the lay of the heating elements to avoid grounding or row to row short circuits. Filters Perform the following checks monthly. Check filters for proper sizing and if facing in the correct airflow direction. Replace filters once a month or more often if unit is in a high use area. Hot Water Coils Perform the following checks annually. Check for presence and proper operation of freezestats on water coils. Lack of safety protection can result in frozen coils and severe water damage. Check fittings, valves and stems for leakage and corrosion. Reset seats and seals by rotating all valves through their entire range of movement and then back to their original setting. Check all piping connections and fittings for general condition or excessive corrosion. Carrier Corporation 2014 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No Printed in U.S.A. Form 52V-3SI Pg Replaces: 52V-2SI