USER S OPERATION MANUAL HL-RD 2000 E EC HL-RD 3000 E ЕС

Transcription

1 USER S OPERATION MANUAL HL-RD 2000 E EC HL-RD 3000 E ЕС Air handling unit with heat recovery

2 2 CONTENT Introduction Use Delivery set Structural designation key Technical data Safety precautions Structure and operating logic Mounting and start-up Condensate drainage Connection to power mains Unit control Functional diagram Technical maintenance Troubleshooting Storage and transportation rules Manufacturing warranty Acceptance certificate Electrical connection certificate Warranty card

3 3 INTRODUCTION The present operating manual contains technical description, data sheet, installation and mounting guidelines for the ceiling-mounted air handling unit with heat recovery VUT PE EC, VENTS series (hereinafter referred as the unit). USE The unit with heat exchanger and electric heater is designed to save thermal energy by means of heat recovery and is one of the energy saving components used in the buildings and premises. The VUT PE EC is a component unit and is not designed for independent operation. The unit is designed to provide permanent controllable air exchange by mechanical ventilation in houses, offices, hotels, cafés, meeting halls and other mechanically ventilated premises as well as utilization of extract air heat energy to warm up supply purified air. Transporting medium must not contain any flammable or explosive mixtures, evaporation of chemicals, coarse dust, soot and oil particles, sticky substances, fibrous materials, pathogens or any other harmful substances. The unit is not designed to be used by children, physically or mentally disabled persons, persons with sensory disorder, persons with no appropriate experience or expertise. The unit can be operated by qualified experts after appropriate instruction about its use and operation. Install the unit to be out of reach of children. Unit VUT PE EC 1 pce; Remote control panel 1 pce; User s manual 1 pce; Packing box 1 pce. DELIVERY SET

4 4 STRUCTURAL DESIGNATION KEY HLRD ХХХX E EC Heater type E electric heating coils Motor type EC electronically commutated Unit type Ventilation with heat recovery Air capacity [m 3 /h] TECHNICAL DATA The unit is designed for indoor application with the ambient temperature ranging from +1 С up to +40 С and relative humidity up to 80%. Ingress Protection (IP) rating from solid objects and liquids: IP 44 for the unit motors; IP 22 for the assembled unit connected to the air ducts. The unit overall and connecting dimensions, external view, technical data are shown in fig. 1 and in tables 1 and 2. The unit design is regularly being improved, so some models can slightly differ from those ones described in this manual.

5 5 HL-RD 2000 E ЕС HL-RD 3000 E ЕС Fig. 1. Overall and connecting dimensions Table 1 Type HL-RD 2000 E EC HL-RD 3000 E EC Ø D B B B B H H L L

6 6 Table 2 Type HL-RD 2000 E ЕС HL-RD 3000 E EC Voltage, 50 Hz [V] 3 ~ 400 Max. fan power [W ] 2 pcs. х pcs. х 990 Max. fan current [W ] (supply voltage of EC-fan) 2 pcs. х 2,5 (230 V) 2 pcs. х 1,7 (400 V) Electric heater power [kw] 12,0 21,0 Electric heater current [A] 17,4 30,0 Total unit power [W] 13,0 23,0 Total unit current [A] 22,4 33,4 Max. air capacity, m 3 /h Rotation speed [min -1 ] Noise level, 3 m [db(a)] Max. transporting air temperature [ С] Filter: Casing material Insulation extract supply Aluzinc 25 mm mineral wool Connecting air duct dia. [mm] Ø 315 Ø 400 Weight [kg] Heat recovery efficiency up to 75 % Heat exchanger type Heat exchanger material G4 G4 cross flow Aluminium SAFETY REQUIREMENTS While operating and mounting the unit consider the requirements of the present operation manual as well as general requirements of all applicable local and national building and electrical codes and standards. The unit must be grounded! Before connecting the unit to power mains make sure that the unit is free of any visible damages or any other foreign objects inside the casing that can damage the impeller blades. Mounting, wireworks and connection to power mains only by duly qualified electricians with valid electric work permit! The unit is not rated for operation in an environment that contains toxic or aggressive substances as acids, alkalis, organic solvents, soot, paint as well as sputtered particles of explosive or aggressive substances. The unit is also not rated for use in areas where atmospheric conditions are determined by sea climate or hot springs or in media where air is deodorized and supplied further to other premises.

7 7 Disconnect the unit from power supply prior to any mounting, servicing, connection or repair operations with the unit. DO NOT! Do not operate the unit beyond the specified temperature range or in an aggressive and explosive medium! Do not connect clothes dryers or similar equipment to the ventilation system! Do not operate the unit in the air and dust mixture medium! STRUCTURE AND OPERATING LOGIC The unit has the following operating logic (fig. 2): Warm stale extract air from the room flows through the air ducts to the unit, is purified in the extract filter and is supplied to the heat exchanger where it transfers a most part of thermal energy and is exhausted outside by exhaust fan. Clean cold air from outside is moved by supply fans inside the air ducts to the supply filter where is it cleaned, then air flows through the heat exchanger where it absorbs extract air thermal energy and then it is supplied to the room by the supply filter. Thermal energy of warm extract air is transferred to clean intake fresh air and warms it up. Heat recovery minimizes thermal energy losses, energy demand and operating costs for climatization accordingly. The basic unit modification includes a remote control panel (9) connected to the control system inside the unit through the data cable (12). The unit consists of the single-inlet centrifugal supply fan 1 and single-inlet centrifugal exhaust fan 2 with backward curved blades driven by maintenance-free EC-motors with external rotor and integrated overheated protection system; cross-flow polystyrene heat exchanger 3 and electric air heater 7. The supply air filter 4 with filter class G4 prevents dirt and dust ingress to supply air from outside and protects the unit components from soiling. The extract filter 5 with filter class G4 protects the unit components against ingress of dirt and dust as well. Some condensate can appear during heat recovery in the heat exchanger (recuperator). The condensate is collected in the drain pan 11 and removed through the drain pipes 6. The temperature sensor TE2 is installed on exhaust air side for frost protection of the heat exchanger. In case of freezing danger, when the exhaust air temperature falls below R-01 value (set from the controller menu, factory setting 0 C) the bypass damper is opened to let supply air flow through the bypass air duct beside the heat exchanger. Extract air flows meanwhile through the heat exchanger and warms up its surface. After defrosting and increase of exhaust air temperature the bypass damper closes the bypass air duct and supply air is directed through the heat exchanger again.

8 INTAKE AIR EXHAUST AIR EXTRACT AIR SUPPLY AIR Fig. 2. Structure and operating logic of the unit 1. Supply fan; 2. Exhaust fan; 3. Cross-flow heat exchanger; 4. Supply fan filter; 5. Extract fan filter; 6. Drain pipe; 7. Electric heater; 8. Bypass damper; 9. Remote control panel; 10. Control block cover; 11. Drain pan; 12. Data cable; 13. Side walls; 14. Swivel panel. MOUNTING AND START-UP The unit is suspended on a threaded rod that is fixed inside a dowel (fig. 3). Example 1 Example 2 Washer Nut Nut Washer Nut Washer Vibration-absorbing rubber Vibration-absorbing rubber Nut and lock-nut Fig. 3 Unit mounting

9 9 While mounting the unit provide enough space for its servicing and maintenance. The minimum distance from the unit to the wall is shown in fig. 4. Minimum distance required for accessing the unit min 10 mm Mounting place of the control block components min 80 mm Fig. 4. Minimum distances for accessing the unit Safety precautions: Mount the unit on a rigid and stable structure. Check the technical parameters and the unit weight. Use bolts to suspend the unit. Make sure that the construction has sufficient load capacity to carry the unit weight. Otherwise reinforce an installation place by beams, etc. After that fix the bolts. If the construction strength is not sufficient enough it can resonate with the unit and create abnormal noise and vibration. While mounting the unit provide enough service space and an access door in the ceiling for inspection and maintenance of the filters, heat exchanger and fans. One access door is required for each unit. For details, refer to the outline drawing Make sure that the ambient conditions match the unit operation requirements before starting any installation works. The operating temperature for the unit ranges between +1 C and +40 C for dry bulb thermometer at relative humidity 80%. If the ambient temperature exceeds +50 С, the polymer parts, for example, air filter, may be deformed and the service life of the motor and electric components may be shortened due to heavy operating conditions.

10 10 If the threaded bolts used for the unit mounting are too short the unit can generate abnormal noise and resonate with the ceiling. Use longer bolts with suitable design to prevent resonance. If the connection point to the spiral seam duct is supposed to be the source of the abnormal noise, install a flexible air duct instead of the flexible one. Flexible connectors may also be useful for resonance elimination. Pre-install the anchor bolts (M8). Install an anchor bolt into the fixation for the ceiling suspension mount and fix it with nuts and washers. Make sure of no foreign objects inside the casing before installation. CONDENSATE DRAINAGE The condensate drain pan that is placed inside the heat recovery block is fitted with condensate drain pipes to remove condensate out of the unit (fig. 5). Connect the condensate drain pipes 1, U-trap 3 (not included into delivery set) and the drainage system 5 with metal, plastic or rubber pipes 2 and 4. The tubes must be sloped down by min. 3. Before starting the unit fill the system with water and check that U-trap is always filled with water. Make sure that the water drainage is correct. Wrong connection to drainage system may result in condensate accumulation and outflow to the premise. Do not connect several drain pipes from several air handling units to one U-trap! Direct condensate outside without connection to drain system is not allowed! Fig. 5. Condensate drainage The condensate drainage system is designed for use at the ambient temperature above 0 С. If the ambient temperature is below 0 C, provide heat insulation and air heating for the draining system.

11 L L N N L1 L N 11 CONNECTION TO POWER MAINS Disconnect the unit from power mains prior to any wireworks. Connection of the unit to power mains is allowed by a qualified electrician with a work permit for the electric units up to 1000 V after detailed study of the present user s manual. The rated electrical parameters of the unit are shown on the rating plate. Any internal connection modification results in warranty loss. The units is rated for connection to three-phase ac 400 V / 50 Hz. (fig. 6 for the unit VUT 2000 PE EC, fig. 7 for the unit VUT 3000 PE EC). The unit shall be connected to power supply by means of insulated, durable and thermal-resistant cords (cables, wires) with respective cross section, in any case no less 4 mm2. The above cross section is for reference only. Actually the cable must be selected in consideration of the maximum wire temperature depending on the wire and insulation type, the maximum current, the lead wire length and its layout way. Use copper wires only. Connect the unit to power mains through the terminal block in the junction box in compliance with the wiring diagram and the terminal marking. Connect all the control and supply cables in compliance with the terminal marking! Connect the unit to power mains through the external automatic thermal-magnetic circuit breaker integrated into the fixed wiring system. The trip current must be in compliance with current consumption, refer table 2. DIgnd DIgnd DI1 DI3 AI4 AO3 AO1 AO2 DIgnd DO4 КАДЕТ CADETmini-24 AIgnd AIgnd DO3 DI5 AI1 DI2 AI2 AIgnd DO2 AOgnd DIgnd AOgnd DIgnd AOgnd DI4 DO5 DO6 AI3 AI5 24V AC 24V AC XS5 XP5 XS6 XP6 XS1 XS2 XS3 XS4 XP1 XP2 XP3 XP L1 L2 L3 L N PENCcom 0-10V Gnd L N PE NCcom 0-10V Gnd c no c no A1 B1 C1 X1 XS7 XP SM3 1 2 tå TE2 1 2 tå TE5 M1 M2 X2 L1 L2 L3 N PE 1 L1 L2 L3 N PE no c 0-10 Gnd tå TS1 tå TS2 Q1 VUT 2000 PE EC - Power 400 V AC 2 1 SM1* 2 1 SM2* 2 1 PK1* SAS908PIT-V2-S1-F3 Р1** ELECTRIC SHOCK HAZARD! tå TE1 Signal for switching Сигнал включения CCB on ККБ (NO contact) Signal for switching CCB on (0-10 V) Design.. SM1* SM2* PK1* P1 ТЕ1 CCB Name Supply air damper actuator Extract air damper actuator Contact from fire alarm panel Remote control panel SAS908PIT Intake air temperature sensor DX cooler Type LF 230 Belimo LF 230 Belimo NO Saswell Group LTD PT-1000 ST-01 Wire*** 2х0,75 mm 2 2х0,75 mm 2 2х0,75 mm 2 2х0,75 mm 2 4х0,75 mm 2 * - not included into delivery set, available separately ** - Connection option depending on the panel model *** - Max. wire length from the unit to the panel is 20 m! **** - Cable length from remote control panel must not exceed 10 m! Fig. 6. External wiring diagram for the unit VUT 2000 PE EC

12 12 CADET VUT 3000 PE EC Power 400 V AC ELECTRIC SHOCK HAZARD! Signal for switching CCB on Сигнал включения ККБ (NO contact) Signal for switching CCB on (0-10 V) Design. CCB Name Supply air damper actuator Extract air damper actuator Contact from fire alarm panel Remote control panel SAS908PIT Intake air temperature sensor DX cooler Type * - not included into delivery set, available separately ** - Connection option depending on the panel model *** - Max. wire length from the unit to the panel is 20 m! **** - Cable length from remote control panel must not exceed 10 m! Wire*** mm mm mm mm mm Fig. 7. External wiring diagram for the unit VUT 3000 PE EC UNIT CONTROL General description of the automatic control system. The unit is equipped with a built-in electronic control and automatic block (refer fig. 8) and the remote control panel (fig. 9). The automatic control system has the following functions: 1. Switching the unit ON/OFF; 2. Maintaining set supply temperature by means of automatic regulation of the electric heating coils power; 3. Air heater overheating protection with two thermostats; 4. Actuating bypass damper; 5. Control of compressor and condensing block of DX cooler according to the room thermostat readings (option); 6. Heat exchanger freezing protection; 7. Controlling supply and exhaust fans; 8.Actuating supply and exhaust air controlling dampers; 9. System shutdown on signal from fire fighting system. Structure and operating logic of automatic control system. To turn the unit on/off, press the button (1) on the control panel, see fig. 9. To adjust the fan speed and air capacity accordingly press the button (3) on the remote control panel, see fig. 9. Control of the electric air heater, actuating of the bypass damper, actuating of the supply and extract air dampers is fully automated by the controller. Supply air temperature is maintained at a set level due to TRIAC control of the electric air heater power.

13 13 After the unit shutdown the electric heating elements are blown by the fan within n minutes to take heat off and cool the heating elements down (parameter E-01, factory setting 1 min.). If the outside air temperature rises above TswitchCCB parameter during the unit operation the control system maintains indoor temperature at set by the room thermostat level by switching to cooling mode. The control system controls switching frequency of the cooler on and off with the minimum time period between the unit switching on/off is 10 min. The indoor temperature is kept at set level by 0-10 V signal sent to the temperature regulator in accordance with the set level. In case of DX cooler installation the TE5 sensor must be installed downstream of the cooler. The control system provides automatic restart of the fans after power failure. This function is activated and adjusted from the controller menu. Fig. 8. Location of the electronic control unit Remote control panel The unit is supplied with a remote control panel which provides the following main functions: Turning the unit on/off from the control panel; Setting required air capacity (auto/high/med/low); Setting supply air temperature; Displaying indoor temperature; Day/Night mode switch. Fig. 9 Remote control panel

14 14 1. ON/OFF button; 2. Heating/cooling mode switching; 3. Fan speed (auto/high/med/low); 4. Day/night mode; 5. Supply air temperature setting up; 6. Supply air temperature setting down; 7. Temperature output signal indicator; 8. Temperature output signal value; 9. Supply air temperature setting indication; 10. Temperature measuring unit; 11 Day / night indication; 12. Fan speed indication; 13. Motion sensor condition (if connected); 14. Indoor temperature displaying. The button (1) switches the unit ON/OF (fig.9). To set the required air capacity (LOW, MED, HIGH or AUTO) press consequently the button (3), see fig. 9. The set speed is displayed on the LCD. The day/ night mode switch is set by the button (4). To turn the system from «day» mode into «night» mode press the button (4) and hold it within 3 s. The selected mode is displayed on the control panel (11). Supply temperature level is set by means of the buttons (5) and (6) and the online temperature setting is also displayed on the control panel LCD (9).

15 15 Digital microcontroller is the basic component of the control block, fig. 10. F1 L1 F2 L2 CADET mini Power Alarm Fault Esc Enter Fig. 10. Digital controller The controller has the following controls and indicators: Indicator; Buttons; LED-lights. Indicator LCD display with illumination. The display shows all the online operating parameters, temperatures, set points and alarms; Buttons 6 buttons on PLC panel designed for the following functions: Esc move one level up in a list; exit parameter editing; Enter move one level down in a list for function selection; enter edit mode; save edited set point. reduce the set point value; move to the previous parameter in a list; increase the set point value; move to the next parameter in a list; F1, F2 controller service buttons. LED lights: Power PLC power supply indicator; Alarm Alarm in the system; Fault PLC alarm; L1 Supply fan operation indicator; L2 Extract fan operation indicator.

16 16 Selecting the required function: Select the required function using the buttons and, then press Enter. Press Esc to return back to the list of functions. Modifying set value: Select the required parameter using the buttons and, then press Enter. Use the same buttons to edit the parameter, i.e. to increase or decrease it. The editing value is blinking. Press Enter to save it. To exit without changes press Esc. The editable values are enclosed in brackets ><. Example: Editing the set supply air temperature value. Select the function «Online parameters» using Esc button. Then enter the «Adjust.» menu with button. Press Enter. Select the required parameter using the buttons or and press Enter. The editing parameter value starts blinking to show its editing process. Increase or decrease the value using the same buttons. Press Enter to set the new value. The controller engineering parameters (factory settings) may be edited only after entering the engineer password. Other parameters can be edited without entering the engineering password. The menu tree description is shown in the table 3. The factory setting column shows the set parameters supplied as a standard. Table 3 Menu tree Factory setting Functions and parameters, effects Online parameters (online pram-s) Online temperatures (online temper-s) TE1 TE2 TE5 Online system parameters Online temperature sensor reading menu. Intake air temperature Exhaust air temperature Supply air temperature ALARMS Alarm code system. Emergency (1) or no emergency (0) E1 E2 E5 Breakdown or short circuit of the intake air temperature sensor. Both fans are stopped. Breakdown or short circuit of the exhaust air temperature sensor. Both fans are stopped. Breakdown or short circuit of the supply air temperature sensor. Both fans are stopped.

17 17 F1 O1 U5 U6 Adjustment Passw Adjustment of fans (Adjust-vent) Alarm F1 (heat exchanger freezing) means that exhaust air temperature at the heat exchanger outlet measured by the temperature sensor TE2 is below the set value R-02 within time period R-03 when the fans are turned off. In case of this alarm the bypass damper is fully opened and both fans continue operation. Emergency system shutdown on the signal from fire fighting system. Both fans are stopped. Alarm U5 (electric heater overheating) means that the electric air heater temperature exceeds 50 С. The electric heater is off and the fans are stopped after blow-off procedure. Alarm U6 (low supply air temperature) means that supply air temperature determined by the sensor TE 5 is below the set value E-03 within time period E-02 after the unit start. This alarm indicates failure of the electric air heater. In case of this alarm the electric heater is turned off and both fans are stopped. Basic controller adjustment menu. Adjustment editing by professionals only! Editing by unauthorized unskilled labour may result in the controller non-serviceability or malfunction. The adjustment menu is password protected. Password information is for professional installers and service engineers only. The adjustment enter password is 1111 by default. To enter the password which is displayed as **** select the first number with buttons and and press Enter, then enter the second number with buttons and then press Enter and so on. After entering the last number press Enter to get to adjustment menu. The engineering menu is displayed, (Eng. adjust.) Fan parameter adjustment menu V Supply fan low speed adjustment [%] V Supply fan medium speed adjustment [%] V Supply fan high speed adjustment [%] V Extract fan low speed adjustment [%] V Extract fan medium speed adjustment [%] V Extract fan high speed adjustment [%] V-08 Enables (yes) This parameter enables/disables fan start-up after power supply failure. Disable function (no) disables the fan start-up after the power supply failure and enable function (yes) enables the fan start-up after the power supply failure;

18 18 Additional adjustments Date/time Date Time Additional controller adjustment menu Day and time in adjustment menu Date adjustment menu Time adjustment menu Correct time 0 PLC timer correction factor per month. If the PLC timer is too fast or too low, adjust the timer respectively by means of adjusting the miscoordination time per month. Set the coefficient in seconds with minus mark if the controller timer is too fast or plus mark if the controller timer is too slow. Change password 2222 Use this function to edit the engineering password. To change the password (which is shown as **** ) select the first number with buttons and and press Enter, then enter the second number with buttons and, then press Enter and so on. To return to the previous digit entry press Esc. After entering the last number the PLC saves the new password. From now on every time when you enter the engineering menu enter the new password. Note: In case of PLC adjustments reset (refer Eng. Adjust., reset) the engineering password is set as Light Auto PLC lighting mode. The LCD display illumination is off after some time period provided that no button were pressed ( Auto mode) or is on all the time ( ON mode). Engineering menu (Engineering adjustment). Engineering menu contains engineering adjustments protected by the engineer password (2222 by default).

19 19 Electric heater adjustment (Adjustheater) Electric air heater adjustment menu. Е-01 1 Time required for heat withdrawal from the electric heating element after the unit is off, [min]. Е Time required to determine too low supply air temperature [s]. If the supply air temperature remains below E-03 parameter after completion of the period E-02, both fans are stopped and the alarm signal U6 is generated (refer Alarms, U6 Alarm). Е Critical temperature point for supply air temperature [ C]. If the actual supply air temperature after the air heater remains below this parameter within the time period E-02, the fans are stopped and the alarm signal U6 is generated. Е-04 6 Electric air heater power regulation time [s]. Е-05 1 Minimum time required to turn the electric air heater on/off [s]. Е-08 2 Е Adjustment of the supply air temperature regulation parameters by the electric heater - PI-regulation proportionality constant. Adjustment of the supply air temperature regulation parameters by the electric heater - PI-regulation integrating coefficient [s]. Е-10 0,5 Adjustment of the supply air temperature regulation parameters by the electric heater - dead zone [ C]. If the discrepancy is below E-10, it shall be disregarded. Adjustment of Recuperator (Adjust- Recuper.) R-01 0 Configuration menu for the heat exchanger protection. Minimum allowable exhaust air temperature at outlet from the heat exchanger that does not require regulation of the exhaust temperature [ C]. If the exhaust air temperature is below R-01, the exhaust temperature regulation function is activated to maintain the set exhaust air temperature and heat exchanger freezing protection. The bypass damper is opened to let the extract air stream flow through the heat exchanger and prevent its freezing. When the exhaust air temperature rises above R-01, the bypass damper is fully closed and the unit reverts to the previous operation mode.

20 20 R-02-5 Minimum allowable exhaust air temperature at outlet from the heat exchanger [ C] to prevent the heat exchanger freezing by full opening of the bypass damper. If in winter mode the exhaust temperature remains below this parameter longer than during R-03 time period, F1 alarm signal is generated, refer Alarm section. R Time period to check the exhaust air temperature value, [s]. R-04 1 R R-06 0,5 R-07 1 R R-09 0,5 CCB adjustment Cpr 2 Ti 60 Dd zone 0,5 Adjustment of PI-regulation proportion factor for exhaust air temperature regulation by controlling the heat exchanger bypass damper. Adjustment of PI-regulation integrating coefficient for exhaust air temperature regulation by the bypass damper, [s]. Adjustment of dead zone parameter for exhaust air temperature regulation by the bypass damper, [ C]. If the discrepancy between the current and required temperatures is below this parameter, it shall be disregarded. Adjustment of parameters for supply air temperature regulation by controlling the heat exchanger bypass damper - PI-regulation proportion factor. Adjustment of PI-regulation integrating coefficient for supply air temperature regulation by the bypass damper, [s]. Adjustment of the dead zone parameter for supply air temperature regulation by the bypass damper, [ C]. If the discrepancy between the current and required temperatures is below this parameter, it shall be disregarded. CCB parameter adjustment menu. Adjustment of the PI-regulation proportionality constant for supply air temperature regulation. Adjustment of PI-regulation integrating coefficient for supply air temperature regulation. Adjustment of PI-regulation dead zone for supply air temperature regulation. Switch per. 60 Minimum period for CCB switching on/off. TonCCB 20 Minimum air temperature to enable CCB turning on.

21 21 In case of any listed above alarm situations, except for the alarm U5 (overheating of the electric heater the light indicator) the system shuts the fans off and the light indicator «Alarm» on PLC panel turns on (fig.10). All the alarms are explained on the PLC display (refer table 3). The automatic control system unblocks all the alarms automatically during the system restart (except for the alarm U5, overheating of the electric heater). In case of the electric heater overheating (U5 alarm) the indicator Alarm on the PLC panel lights up (fig. 10). The control system switches the electric heater off but both fans continue operating within some time period to cool the electric heating elements down. Alarm U6 (low supply air temperature) appears if supply air temperature measured by the temperature sensor TE5 is below the set value E-03 within time period E-02 after the unit start. This alarm indicates malfunction of the electric air heater. In case of this alarm the electric air heater is turned off and both fans are stopped. FUNCTIONAL DIAGRAM OUTSIDE OUTSIDE INSIDE INSIDE POWER SUPPLY Digital input (DI) Digital output (DO) Analogue input (AI) Analogue output (AO) Designation Name Supply air damper Extract air damper Supply filter Extract filter Supply fan Exhaust fan Room control panel Electric heater Plate air-to-air heat exchanger Supply damper actuator Extract damper actuator Bypass damper electric actuator Outer air temperature sensor Temperature sensor at heat exchanger outlet Supply duct air temperature sensor Overheat protection thermostat 50 С with automatic reset Overheat protection thermostat 90 С with manual reset Fig. 11 Unit functional diagram

22 22 TECHNICAL MAINTENANCE Maintenance operations of the unit are required 3-4 times per year. Maintenance includes regular cleaning and the following operations: 1. Filter maintenance. Dirty filters increase air resistance in the system and reduce supply air volume. The filters require cleaning once in 3-4 months. Vacuum cleaning is allowed. Worn out filters should be replaced with the new filters once or twice per year. Contact your local manufacturer representative for new filters. 2. Heat exchanger inspection (once per year). Some dust can get accumulated on the heat exchanger block even in case of regular maintenance of the filters. To maintain the high heat exchange efficiency, regular cleaning is required. To clean the heat exchanger pull it out of the unit and clean it with warm detergent water solution. Re-install the dry heat exchanger to the unit. 3. Fan inspection (once per year). Even in case of regular perform regular maintenance of the filters and the heat exchanger, some dust and grease can get accumulated inside the fans and reduce the fan performance and supply air flow. Clean the fans with a soft brush or cloth. No water and abrasive detergent, sharp objects or solvents are allowed for cleaning to prevent the impeller damage. 4. Drain system inspection (once per year). The drain pipes may get clogged with the extracted particles. Pour some water inside the drain pan and check the pipe for clogging. Clean the U-trap and drain pipe if required. 5. Supply air flow control (twice per year). Leaves and other pollutions can clog the supply air grille and reduce the unit performance and supply air volume. Check the supply grille twice per year and clean it as required. 6. Ductwork system inspection (once in 5 years). Even if you follow all the listed maintenance guidelines, some dust can get accumulated inside the air ducts and reduce the unit performance. Duct maintenance means regular cleaning or replacements. 7. Exhaust grilles and intake diffusers cleaning (as required). Remove the diffusers and the grilles and wash them with warm water and mild detergent solution. Do not change locations of the diffusers and the grilles.

23 23 FAULT HANDLING Possible faults and fault handling Table 4 Trouble Possible reasons Fault handling The fan(s) do(es) not get started Automatic circuit breaker tripping. Low air flow. Cold supply air. High noise, vibration. Water leakage. No power supply. Motor is jammed, the blades are soiled. Alarm in the system. High current consumption due to short circuit in power line results in automatic circuit breaker triggering. Low set air flow. The filters, fans are soiled, the heat exchanger is soiled. The ventilation system components (air ducts, diffusers, louvre shutters, grilles) are soiled or damaged. Air dampers, diffusers or louvre shutters are closed. The extract filter is soiled. The heat exchanger is frozen. Malfunction of the heater. The impeller(s) is(are) soiled. Loose screw tightening. No anti-vibration mounts. The drain system is soiled, damaged or wrong arranged or wrong slope angle of the unit toward the drain system. Make sure the power supply line is connected correct, otherwise troubleshoot the connection error. Turn the unit off. Remove the motor jamming. Clean the blades. Restart the unit. Remove the system alarm. Restart the unit. Turn the unit off. Remove the reason of high power consumption. Check the automatic circuit breaker operation. Turn the circuit breaker off-on. Restart the unit. Switch the unit to higher air flow. Clean or replace the filters; clean the fan(s) and the heat exchanger. Clean or replace the ventilation system components (air ducts, diffusers, louvre shutters, grilles). Make sure that the air dampers, diffusers or louvre shutters are fully opened. Clean or replace the extract filter. Check the heat exchanger condition. Shutdown the unit and turn it on after the freezing danger is no longer imminent. Contact the service centre. Clean the impeller(s). Tighten the screws. Install the rubber anti-vibration mounts. Clean the drain system. Check the drain slope angle. Make sure that the U-trap is filled with water and the drain pipes are frost protected.

24 24 STORAGE AND TRANSPORTATION RULES Store the unit in the manufacturer s original packing box in a closed ventilated premise with temperature range from +10 C to +40 C and relative humidity less than 80% (at 20 C). Vapors or particles which can cause corrosion or damage the insulation or connection tightness are not allowed in the storage environment. Use hoist machinery for handling and transportation to prevent possible mechanical damages of the unit. Fulfill the requirements for transportation of the specified cargo type during cargo-handling operations. Use any vehicle types for the unit transportation provided that it is protected against mechanical or weather damage. Avoid any mechanical shocks and strokes during handling operations. MANUFACTURER S WARRANTY Manufacturer hereby guarantees normal performance of the unit during two years from the date of retail sale provided compliance with transport, storage, mounting and operation regulations. In case of no confirmation of the sales date the warranty period is calculated from the manufacturing date. In case of failures in the unit operation during the warranty period the manufacturer will accept reclamations and complaints from the owner of the device only after receiving technically sound act with detailed description of the failure. Unit damage as a result of unauthorized tampering with the circuit diagram is not a warranty case. For warranty and post-warranty services of the unit please contact the product manufacturer. In case of warranty claim please submit the present user s manual with the seller s stamp, filled connection certificate and warranty card. Warranty repair services (provided that the warranty card and the seller s stamp and the present user s manual) and post-warranty services are fulfilled at the manufacturing facility. WARRANTY CLAIMS ARE ACCEPTED WITH THIS USER S MANUAL AND FILLED CONNECTION CERTIFICATE ONLY. The MANUFACTURER is not responsible for any mechanical or physical damages resulting from the manual requirements violence, the unit misuse or gross mechanical effect. Fulfill the requirements set in the user s manual to ensure proper functioning of the unit.

25 25 ACCEPTANCE CERTIFICATE The air handling unit with heat recovery VUT PE EC has been duly certified as serviceable. We hereby declare that the product complies with the essential protection requirements of Electromagnetic Council Directive 2004/108/EC, 89/336/EEC and Low Voltage Directive 2006/95/EC, 73/23/EEC and CE-marking Directive 93/68/EEC on the approximation of the laws of the Member States relating to electromagnetic compatibility. This certificate is issued following test carried out on samples of the product referred to above. Acceptance Inspector s Stamp Date of manufacture Sold by Name of trade company Date of sale ELECTRICAL CONNECTION CERTIFICATE This is to certify that the air handling unit VUT PE EC has been connected to power mains pursuant to the requirements stated in the present user s manual by a qualified technician: Company Name Date Signature WARRANTY CARD

26 TP12112_EN