HEAT PUMP UNIT *VZC20 Heat Pump Installation & service reference IMPORTANT SAFETY INSTRUCTIONS The following symbols and labels are used throughout this manual to indicate immediate or potential safety hazards. It is the owner’s and installer’s responsibility to read and comply with all safety information and instructions accompanying these symbols. Failure to heed safety information increases the risk of personal injury, property damage, and/or product damage.
INDEX Important Safety Instructions.....................................1 Shipping Inspection.........................................................3 Codes & Regulations.......................................................3 Features............................................................................3 Installation Clearances................................................3 Rooftop Installations....................................................4 Safe Refrigerant Handling.........................
CAUTION NOTICE THE UNIT HAS ITS OWN PUMP-DOWN MODE. USE THE PUMP-DOWN MODE WHILE VACUUMING THE UNIT. VACUUMING TOO LOW CAN CAUSE INTERNAL ELECTRICAL ARCING, RESULTING IN A DAMAGED OR FAILED COMPRESSOR. Inverter Heat Pump models can only be matched with an AVPEC air handler or TXV-V** expansion valve kit. Damage resulting from operation with any other combination is not covered by our warranties. NOTE: For AVZC200241AF / 0361AE / 0481AE / 0601AE or older, please refer to IOA-4013F.
require placement beneath an obstruction there should be a minimum of 60 inches between the top of the unit and the obstruction(s). The specified dimensions meet requirements for air circulation only. Consult all appropriate regulatory codes prior to determining final clearances.
The liquid line must be insulated if more than 50 ft. of liquid line will pass through an area that may reach temperatures of 30 °F or higher than ambient in cooling mode and/or if the temperature inside the conditioned space may reach a temperature lower than ambient in heating mode. Never attach a liquid line to any uninsulated potion of the suction line. WARNING TO AVOID POSSIBLE EXPLOSION, USE ONLY RETURNABLE (NOT DISPOSABLE) SERVICE CYLINDERS WHEN REMOVING REFRIGERANT FROM A SYSTEM.
REFRIGERANT LINE CONNECTIONS LEAK TESTING (NITROGEN OR NITROGEN-TRACED) IMPORTANT To avoid overheating the service valve, TXV, sensor or filter drier while brazing, wrap the component with a wet rag, or use a thermal heat trap compound. Be sure to follow the manufacturer’s instruction when using the heat trap compound. NOTE: Remove Schrader valves from service valves before brazing tubes to the valves. Use a brazing alloy of 2% minimum silver content. Do not use flux.
The Triple Evacuation Method is (Recommended) 1. Evacuate the system to 4000 microns and hold for 15 minutes. Then, break the vacuum with dry nitrogen, bring the system pressure up to 2-3 PSIG, and hold for 20 minutes. Release the nitrogen, 2. Evacuate to 1500 microns and hold for 20 minutes. Break the vacuum with dry nitrogen again, bring the system pressure back up to 2-3 PSIG, and hold for 20 minutes. 3. Then, evacuate the system until it is below 500 microns and hold for 60 minutes.
• Make sure the wirings will not be pinched by the front panel, and close the panel firmly. • Route the conduit along the unit and so on to prevent wirings from being stepped on. NOTICE • Never install a phase-advancing capacitor. As this unit is equipped with an inverter, installing a phaseadvancing capacitor will not only deteriorate power factor improvement effect, but also may cause capacitor abnormal heating accident due to high-frequency waves. • Do not change the setting of the protection devices.
CAUTION POSSIBLE REFRIGERANT LEAK! TO AVOID A POSSIBLE REFRIGERANT LEAK, OPEN THE SERVICE VALVES UNTIL THE TOP OF THE STEM IS 1/8” FROM THE RETAINER. CAUTION ENSURE VALVES ARE OPEN AND ADDITIONAL CHARGE IS ADDED BEFORE APPLYING POWER . Note: The following table lists the equivalent length gained from adding bends to the suction line.
Step 3. System Start-up Test Before starting the CHARGE MODE, turn off the Cool or Heat mode and electric heater or gas furnace. NOTICE a. Inverter units are charged by any of the following methods: • setting the “CR9” menu (Charge Mode) to ON through the indoor unit control board push buttons. • setting the Charge mode menu of mode display screen-4 to ON through the outdoor unit control board push buttons. • Through the CoolCloud HVAC phone application. b.
Charging Table OD AMBIENT TEMP < 65° F (degF) Subcooling Weigh in (degF) Charge SATURATED SUCTION PRESSURE TEMPERATURE CHART 65° F to 105° F > 105° F 8° F ± 1° F Weigh in Charge NOTE: Subcooling information is only valid while the unit is operating at 100% capacity or 100% of compressor speed in CHARGE MODE. Compressor speed is displayed under STATUS menu in the thermostat. 8. For TXV Indoor Unit The system subcooling should be 8°F ± 1°F (*1).
humidity sensor and dehumidification terminal. Without this type of thermostat, dehumidification operation does not work. OUTDOOR UNIT DIPSWITCH FACTORY DEFAULT SETTINGS Switch # Setting Function 1 ON CT Communication Terminal Resister DS1 2 ON CT Communication Terminal Resister 1 ON Cooling Emergency Mode* DS2 2 ON Cooling Emergency Mode* Dehumidification requires a thermostat capable of reading the indoor humidity level and allowing the user to set a dehumidification target.
Cooling Airflow Profile • Profile A provides only an OFF delay of one (1) minute at 100% of the cooling demand airflow. (If using a CTK04 thermostat, please see the addendum for further instructions.) Fault Code History The heat pump’s diagnostics menu provides access to the most recent faults. The six most recent faults can be accessed through the control board seven segment displays or the CoolCloud mobile app. Any consecutively repeated fault is stored a maximum of three times.
*1 1. At Cool and Heat Hi speed trim, *VZC200601* with **VC960804C, **VM970804C and *MVC800804C combination trim more than 5% settings are invalid. Trimmed up CFM makes miss matching error. 2. At Cool Hi speed trim, Other than the above, depending on the connected indoor unit, there are restrictions on the positive side Trim setting. If you want to change the Cool Airflow Trim to positive side, be sure to confirm the Airflow Trim restrictions in the latest indoor unit installation manual.
Heat Pump Advanced Feature Menu SUBMENU ITEM ALL ACTIVE HISTORY REFRESH HEAT PUMP / FAULT CODE HISTORY INDICATION/USER MODIFIABLE OPTIONS (The Active and History Fault codes are displayed.) (The Active Fault codes are displayed.) (The History Fault codes are displayed .
Heat Pump Advanced Feature Menu SUBMENU ITEM BOOST MODE ENABLE BOOST TEMP HEAT PUMP / DEVICE SETTING (1) INDICATION(Units) OFF or ON Always Active or 70F to 105F in icrements INDOOR/OUTDOOR HEIGHT DIFFERENCE Both Units at Same Level, Outdoor Unit is Lower, or Indoor Unit is Lower RESET FOR SYSTEM SET UP NO or YES SYSTEM VERIFICATION TEST OFF or ON PUMP DOWN OFF or ON ACTIVATE CHARGE MODE OFF or ON COOLING TRIM FACTOR(HIGH) *1, 2 -15% to +15% in 5% increments COOLING TRIM FACTOR(MID) -15% to
Heat Pump Advanced Feature Menu SUBMENU ITEM HEAT PUMP / DEVICE SETTING (2) INDICATION(Units) DEHUMIDIFICATION ENABLE*4 Standard, OFF, A, B or C RESET COOLING SETTINGS NO or YES COMMENTS Selecting "OFF" disables dehumidification selecting. "Standard", "A", "B" or "C" enables dehumidification. Selecting yes will reset any cooling setting to their factory defaults. When determining the appropriate compressor speed for cooling, select the range that contains the desired value.
R C TO INDOOR UNIT GR 2 E1 X25A L 0 Y2 Y1 W1 1 X851A L2 L1 NOTE 1 DS1 2 1 ON OFF X21A EEV RD FIELD WIRING SEE NOTE 3 208-230 V 60 HZ TERMINAL BLOCK BK BS2 Z3C BS3 HR1 HR3 GROUND LUG SEE NOTE 3 X108A HR4 RD WH BR WH - + Z2C Z1C HPS H/LPT COLOR CODE: RD------------RED BR------------BROWN GR-----------GREEN BK------------BLACK WH-----------WHITE YL------------YELLOW BL------------BLUE GY-----------GRAY PU-----------PURPLE YL W BK RD V HR2 BK Z4C RD PU U X32A
BK BK GR SEE NOTE 4 SEE NOTE 3 R C TO INDOOR UNIT E1 X851A HPS X32A X99A X25A 0 L Y2 Y1 W1 2 1 X12A OFF RD BL BS2 FIELD WIRING NOTE 3 208-230 V 60HZ X52A GND BK W V U L2C INVERTER BOARD TERMINAL BLOCK L1A RD BK COLOR CODE: RED RD-------------BROWN BR-------------GREEN GR-------------BLACK BK-------------WHITE WH------------YELLOW YL--------------BLUE BL--------------- Z3C RD WH BK YL RD BK L1B NOISE FILTER BOARD L2A X98A L2B X108A ON OFF 1 2 NOTE 1 DS2 L1C
Testing Capacitor Resistance WARNING AVOID CONTACT WITH THE CHARGED AREA. •NEVER TOUCH THE CHARGED AREA BEFORE CONFIRMING THAT THE RESIDUAL VOLTAGE IS 50 VOLTS OR LESS. 1. SHUT DOWN THE POWER AND LEAVE THE CONTROL BOX FOR 10 MINUTES. 2. MAKE SURE TO TOUCH THE EARTH GROUND TERMINAL TO RELEASE THE STATIC ELECTRICITY FROM YOUR BODY (TO PREVENT FAILURE OF THE PC BOARD). 3. MEASURE THE RESIDUAL VOLTAGE IN THE SPECIFIED MEASUREMENT POSITION USING A VOM WHILE PAYING ATTENTION NOT TO TOUCH THE CHARGED AREA. 4.
Testing Capacitor Resistance WARNING AVOID CONTACT WITH THE CHARGED AREA. •NEVER TOUCH THE CHARGED AREA BEFORE CONFIRMING THAT THE RESIDUAL VOLTAGE IS 50 VOLTS OR LESS. 1. SHUT DOWN THE POWER AND LEAVE THE CONTROL BOX FOR 10 MINUTES. 2. MAKE SURE TO TOUCH THE EARTH GROUND TERMINAL TO RELEASE THE STATIC ELECTRICITY FROM YOUR BODY (TO PREVENT FAILURE OF THE PC BOARD). 3. MEASURE THE RESIDUAL VOLTAGE IN THE SPECIFIED MEASUREMENT POSITION USING A VOM WHILE PAYING ATTENTION NOT TO TOUCH THE CHARGED AREA. 4.
X X X X X X X X X X X X X X X X X X X Dirty OD Heat-exchanger Dirty ID Heat-exchanger Outdoor Ambient temp is too high Outdoor Ambient temp is too low ID suction temp is too high X X X X X X X X X OD fan motor failure RV failure RV coil failure Over charge Under charge Leak TXV failure TXV size is small TXV size is big ID failure OD Control Board failure Compressor failure Cooling loop is not attached Cooling loop grease is not enough Compressor and Gas furnace are operating at the same tim
X X Line set restriction Line set length is too long X X X X X X X X Stop operation X Noise X X No switch cooling Requested % demand < Actual X X X Low pressure < 100psi X X X Low pressure > 185psi X X X OD SSV SH < 4F X X X X X X X X X X OD EEV failure Check valve failure – Blocked High Pressure switch failure X X X X X X X X X X X X X X X X X X X X X X X X X OD EEV coil failure Blocked filter-dryer X X OD SSV SH > 20F LSV SC < 4F X X X LSV
Troubleshooting ClimateTalk Fault Code PCB LED Display Transmitted ClimateTalk Message 12 E12 OD CTRL FAIL1 13 14 15 16 E13 - E15 - Thermostat Fault Probable Causes High electrical noise Faulty control board Indicates a general memory error. Corrective Actions Replace control board if necessary This error indicates the equipment is experiencing frequent high pressure faults.
Troubleshooting ClimateTalk Fault Code PCB LED Display Transmitted ClimateTalk Message 22 E22 HI DISCH TEMP 23 E23 DISCH TEMP FAIL 24 E24 HPS OPEN 25 E25 AIR SENSOR FLT 26 E26 PRESSURE SENSOR 27 E27 28 Thermostat Fault Probable Causes Corrective Actions This error indicates the equipment is experiencing frequent high discharge temperature faults. Discharge thermistor is not put on correct position.
Troubleshooting ClimateTalk Fault Code 35 PCB LED Display E35 Transmitted ClimateTalk Message HIGH CURRENT Thermostat Fault Probable Causes Short circuit condition Stop valve not completely open Overcharge Faulty control board Faulty compressor Board detected a high current condition. Blocked/restricted condenser coil and/or lines The compressor wire is lost phase Inconsistent compressor load Faulty control board Corrective Actions Check installation clearances.
Troubleshooting ClimateTalk Fault Code 53 54 55 PCB LED Display - - - Transmitted ClimateTalk Message Thermostat Fault Probable Causes Corrective Actions PCB PR FAN MIN This error indicates the equipment is experiencing frequent outdoor control board and/or motor faults. Control has determined continued operation is acceptable. This indicates there may be a problem with the equipment.
Network Troubleshooting If a network communication error code has occurred, use the following steps to help troubleshoot the system. (For network communication error codes, refer to the table below and the tables of error codes for outdoor unit and indoor unit.) 3. Perform continuity check on wires to make sure cable is OK. Replace the cable if necessary. 4. Change both dip switches of DS1 on the outdoor unit control board to the opposite position. See image below.
Setting The Mode Display MODE DISPLAY INTRODUCTION A 3-digit display is provided on the printed circuit board (PCB) as a backup tool to the thermostat for reading faults, fault history, monitoring and setting up the unit. Follow the information provided in this section to learn how to use the mode display. DISPLAY The display consists of 3 digits. OFF ON Blink interval: 0.4 sec. On - 0.4 sec.
Setting The Mode Display NAVIGATING THROUGH THE DISPLAY SCREENS SCREEN 0 The home or default screen on the display. This shows the most recent fault. SCREEN 1 To access, hold the RECALL button for 5 seconds at screen 0. SCREEN 2 To access, hold the RECALL button for 5 seconds at screen 1. SCREEN 3 To access, hold the RECALL button for 5 seconds at screen 2. SCREEN 4 To access, hold the RECALL and TEST buttons simultaneously for 5 seconds at screen 2.
Setting The Mode Display FAULT CODE HISTORY NAVIGATION < SCREEN 1> This mode will allow the user to see the six most recent system faults. For a list of the fault codes, please see the TROUBLESHOOTING tables in this document. < SCREEN 0 > Press LEARN Hold RECALL < SCREEN 1 > The display will change to < SCREEN 1 >. Press RECALL to change Fault code history. Displays most recent Fault code. Press RECALL. Press RECALL Displays 2nd most recent Fault code. Press RECALL. Press RECALL.
Setting The Mode Display MONITORING MODE NAVIGATION OFF < SCREEN 0 > < SCREEN 2 > This screen allows the user to monitor system variables as shown in the tables at the end of this section. ON Blink interval: 0.4 sec. On - 0.4 sec. Off < SCREEN 1 > Press LEARN Hold RECALL < SCREEN 2 > Press RECALL to increase the value. Press RECALL. Press RECALL Press RECALL. Item number Press TEST to confirm the setting. Press RECALL. Press RECALL. 33 Display flickers at 1 second intervals.
Setting The Mode Display SETTINGS MODE 1 NAVIGATION < SCREEN 3 > Setting Mode 1 allows the user to adjust system settings as shown in the tables at the end of this section. OFF < SCREEN 0 > ON Blink interval: 0.4 sec. On - 0.4 sec. Off < SCREEN 2 > Hold RECALL. Press LEARN. < SCREEN 3 > Press RECALL to increase the value. Press RECALL. Press RECALL. Press RECALL. Press TEST to change setting. Press RECALL. Press TEST to complete setting and return to setting mode.
Setting The Mode Display SETTINGS MODE 2 < SCREEN 4 > Setting Mode 2 allows the user to change system settings. See table in back of this section. OFF < SCREEN 0 > ON Blink interval: 0.4 sec. On - 0.4 sec. Off < SCREEN 2 > Press LEARN. Hold RECALL and TEST. < SCREEN 4 > Press RECALL to increase the number. < Changing setting display > Press RECALL. Press RECALL Press RECALL. Press RECALL. Press TEST to change setting. Press RECALL. Press RECALL. Press RECALL.
7-Segment Display SCREEN 0 (Display FAULT CODE) Setting No. Contents 1 Fault code (present) Notes SCREEN 1 (Display FAULT CODES) Setting No. Contents Notes 1 Fault code (latest) Latest 2 Fault code (2nd) 2nd 3 Fault code (3rd) 3rd 4 Fault code (4th) 4th 5 Fault code (5th) 5th 6 Fault code (6th) 6th Contents Notes SCREEN 2 (MONITOR MODE) Setting No.
7-Segment Display SCREEN 3 (SETTING MODE 1) SCREEN 3 (SETTING MODE 1) Se�ng No. Contents Se�ng Installer/Serviceman Notes 1 Cool Airflow Trim High *1, *2 0: -15% 1: -10% 3: 0% 5: 10% 2 Cool Airflow Trim Int 0: -15% 3: 0% 6: 15% 1: -10% 4: 5% 7: 20% 3 Cool Airflow Trim Low 2: -5% 4: 5% 6: 15% 2: -5% 5: 10% 8: 30% 0: -15% 3: 0% 6: 15% 1: -10% 4: 5% 7: 20% 9: Full *3 9: Full *3 2: -5% 5: 10% 8: 30% 4 Cool Profile 0: A 1: B 2: C 3: D 5 Cool Fan ON Delay 0: 5sec.
SPLIT SYSTEMS AIR CONDITIONING AND HEAT PUMP HOMEOWNER’S ROUTINE MAINTENANCE RECOMMENDATIONS We strongly recommend a bi-annual maintenance checkup be performed before the heating and cooling seasons begin by a qualified servicer. REPLACE OR CLEAN FILTER CLEAN OUTSIDE COIL (QUALIFIED SERVICER ONLY) IMPORTANT NOTE: Never operate unit without a filter installed as dust and lint will build up on internal parts resul�ng in loss of efficiency, equipment damage and possible fire.
CTK04 ADDENDUM Two Wire Outdoor, Four-Wire Indoor Wiring Low voltage wiring consists of two wires between the indoor unit and heat pump and four wires between the indoor unit and thermostat. The required wires are data lines 1 and 2, “R” (24 VAC hot) and “C” (24 VAC common). Never connect the power wiring to communication terminal (1, 2, R, C). ATTENTION INSTALLER - IMPORTANT NOTICE! Please read carefully before installing this unit.
System Start-up Test NOTICE ON INITIAL POWER START-UP, THE OUTDOOR UNIT WILL DISPLAY CODE E11, SIGNALING THAT INITIAL SYSTEM TEST MUST BE RUN. FOLLOW THE COMFORTNET™ SETUP SCREEN TO ENTER APPLICATION-UNIQUE INFORMATION. SEE COMFORTNET THERMOSTAT MANUAL FOR DETAILED INFORMATION. A system test is now required to check the equipment settings and functionality. Once selected, it checks the equipment for approximately 5 - 15 minutes. System test may exceed 15 minutes if there is an error.
4. From the MENU screen, scroll down and select COMFORTNET™ USER MENU. 5. Enter Installer password. (The password is the Date Code located on the thermostat and is available by entering the EQUIPMENT STATUS menu and scrolling to the bottom.) 6. Select YES to continue. 7. From the ComfortNet USER MENU, select HEAT PUMP. Note: Screen may show air handler or furnace depending on the type of system installed.
8. Next, scroll down and select EQUIP TEST. 9. Select SYSTEM TEST. 10. Select ON to run the SYSTEM TEST. Press DONE to initiate test. 11. Allow the system test to run for its duration (5-15 minutes). EQUIP TEST SCREEN will show the system test is ON once selected. System test will operate the outdoor unit and the indoor unit through a series of startup tests. Please proceed to the next step and allow for startup tests to complete.
12. Press Previous Menu button and navigate to HOME screen and allow test to finish. The display similar to the one at the right will be displayed after SYSTEM TEST completes. Test is complete only when CODE 11 notice clears from BOTH the thermostat display AND the seven segment LED display on the outdoor unit. Please wait for test to complete and for both codes to clear. Set Thermostat to CHARGE MODE Please follow the following sequence to enter CHARGE MODE. CHARGE mode allows for charging of the system.
3. Enter Installer password. (The password is the Date Code located on the thermostat and is available by entering the EQUIPMENT STATUS menu and scrolling to the bottom). 4. Select YES to continue. 5. Select HEAT PUMP. 6. Select MAINTENANCE.
7. Select CHARGE MODE. 8. Select ON. Press DONE to initiate CHARGE mode. (System will then run for 1 hour and either return to cooling or heating mode depending on the mode thermostat is set at COOL or HEAT, or stop if the thermostat is set for FAN only mode.) If charging is not complete after 1 hour, repeat 7. and 8. Refer to “Adjust Refrigerant Level” and “Measure Subcooling to Verify Proper Charge” for refrigerant charge level adjustment. 9. To terminate CHARGE MODE, select CHARGE mode screen again.
Field Selectable Boost Mode BOOST MODE enables the system to operate at increased compressor speed to satisfy unusual high loads. BOOST MODE is initiated by an outdoor temperature sensor located in the outdoor unit. Please note that outdoor equipment operational sound levels may increase while the equipment is running in BOOST MODE. Disabling BOOST MODE will provide the quietest and most efficient operation. NOTE: Boost mode is applicable only for *VZC200**1AB and GVZC20**AA or later revision.
4. Select YES to continue. 5. Select HEAT PUMP. 6. Select SYS SETUP.
7. BOOST MD turns BOOST MODE OFF or ON. BOOST MODE is on by default. 8. BOOST TEMP adjusts the activation temperature from 70° F to 105° F. “Always ON” option is also available to permanently engage BOOST MODE. Factory default is 105° F.
9. Once satisfied with BOOST MODE adjustments, navigate to the HOME screen by selecting the Previous Menu button three times then selecting HOME. Dehumidification The thermostat reads the indoor humidity level from the CTK04 and allows the user to set a dehumidification target based on these settings. The thermostat controls the humidity level of the conditioned space using the cooling system.
ComfortNet™ System Status This menu displays information about the systems current status. This menu can be utilized to confirm correct functionality of the equipment and for troubleshooting purposes. The following items will be displayed: Overview A ComfortNet inverter heating and air conditioning system uses an indoor unit, outdoor unit and thermostat which digitally communicate with one another via a two-way communications path. The thermostat sends commands to the indoor and outdoor units.
System Setup • This menu allows for the setting of BOOST MODE. BOOST MODE enables the system to operate at a higher compressor speed than maximum compressor speed. Profile D (default) ramps up to 50% of the demand for 1/2 minute, then ramps to 82% of the full cooling demand airflow and operates there for approximately 7 1/2 minutes. The motor then steps up to the full demand airflow. Profile D has a 1/2 minute at 50% airflow OFF delay. BOOST MODE set temperature can be adjusted in BOOST TEMP menu.
NOTE: In high humidity environments, sweating on supply ducts, cased coils or air handler cabinets can become an issue in Enhanced Dehumidification operation. It is strongly recommended covering then with 2” fiberglass insulation for these installations. Cool Run Values Depending on the system configuration, adjusting the maximum compressor RPS (revolutions per second) may be required. Necessary adjustments to the maximum compressor RPS are made through the following sub-menus.
* Only for AVZC200**AB and GVZC20**AA or later revision. ATPRM is shown in AVZC200**AA and GVZC20**AA revision. ** Only for AVZC200**AB and GVZC20**AA or later revision. PSD is shown in AVZC200**AA and GVZC20**AA revision.
NOTE: BOOST MODE is applicable only for AVZC200**AB and GVZC20**AA or later revision.
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