CONDENSING UNIT *VXC20 Air Conditioning 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 air conditioning 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 AVXC200241AF / 0361AE / 0481AE / 0601AE or older, please refer to IOA-4011F.
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. Electrical Noise The unit should be well grounded so that potential effects of electrical noise from the inverter to surrounding equipment can be minimized. Another important consideration in selecting a location for the unit(s) is the angle to obstructions.
Do NOT let refrigerant lines come in direct contact with plumbing, ductwork, floor joists, wall studs, floors, and walls. When running refrigerant lines through a foundation or wall, openings should allow for sound and vibration absorbing material to be placed or installed between tubing and foundation. Any gap between foundation or wall and refrigerant lines should be filled with a pliable siliconbased caulk, RTV or a vibration damping material.
Air Conditioner BELOW Indoor Coil Air Conditioning Unit 6
LEAK TESTING (NITROGEN OR NITROGEN-TRACED) Refrigerant Line Connections 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.
• Use copper conductors only. • Use insulated wire for the power cord. • Select the power supply cable type and size in accordance with relevant local and national regulations. • Outside the unit, make sure to keep the wirings 5 inch away. Otherwise, the outdoor unit may be affected by electrical noise (external noise), and malfunction or fail. • Make sure the wirings will not be pinched by the front panel, and close the panel firmly.
If installing with a CTK04 thermostat, please see the addendum for further instructions. 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 . After the refrigerant charge has bled into the system, open the liquid service valve.
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.
OD AMBIENT TEMP (degF) Subcooling (degF) Charging Table < 65° F 65° F to 105° F > 105° F Weigh in Charge 2T to 4T: 8°F ± 1°F 5T: 10°F ± 1°F Weigh in Charge SATURATED SUCTION PRESSURE TEMPERATURE CHART 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.
Dehumidification Tips For effective dehumidification operation: • Ensure “Dehumidification selection” is NOT set to “OFF”. • Verify the cooling airflow profile is set to “Profile D”.
Device 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.
Dehumidification Select Dehumidification requires a thermostat capable of reading the indoor humidity level from the thermostat 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. Dehumidification is engaged whenever a cooling demand is present and structural humidity levels are above the target level.
Air Conditioner Advanced Feature Menu SUBMENU ITEM ALL ACTIVE HISTORY REFRESH AIR CONDITIONER(AC) / 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 .
Air Conditioner Advanced Feature Menu SUBMENU ITEM AIR CONDITIONER(AC) / DEVICE SETTING INDICATION(Units) BOOST MODE ENABLE OFF or ON BOOST TEMP Always Active or 70F to 105F in increments COMMENTS BOOST MODE is ON by default. See BOOST MODE section of this manual for more details. If enabled, when the ambient outdoor temperature is greater than this selected value, boost mode will be operational. Below this temperature the mode will not function.
E1 Y1 Y2 L 0 L2 X851A OFF L1 NOTE 1 2 1 ON DS1 BS1 BS2 SEG 1 RD TERMINAL BLOCK BK INVERTER BOARD X11A SEE NOTE 3 208-230 V 60 HZ FIELD WIRING X12A AMBIENT BS3 Z3C ON OFF X17A 1 2 NOTE 1 DS2 HR1 X108A HR4 HR2 BK BR GR WH GROUND LUG SEE NOTE 3 HR3 RD WH ON OFF COLOR CODE: RD----------------RED BR----------------BROWN GR----------------GREEN BK----------------BLACK WH--------------WHITE YL----------------YELLOW BL----------------BLUE PU---------------PURPLE GY----------
GR X851A E1 HPS X32A X99A Y1 Y2 L 0 W1 R C 2 TO INDOOR UNIT 1 GY X12A X11A NOTE 1 DS1 2 1 ON OFF BS1 X111A BS3 SEG 3 BL NOTE 3 208-230 V 60 HZ FIELD WIRING X52A W INVERTER BOARD SEE NOTE 3 GND L2C V U BK X108A ON OFF NOTE 1 1 2 DS2 L1C L1A Z3C RD WH BK YL RD BK RD L1B NOISE FILTER BOARD X98A L2B TERMINAL BLOCK SHARE DATA BS2 SEG SEG 2 1 FIN THERMISTOR DISCHARGE LINE LIQUID LINE COIL INLET X17A BK SEE NOTE 4 SEE NOTE 3 RD YL + - RD 1.
COLOR CODE: RD----------------RED BR----------------BROWN GR----------------GREEN BK----------------BLACK WH--------------WHITE YL----------------YELLOW BL----------------BLUE SEE NOTE 4 SEE NOTE 3 RING COLOR AMBIENT BS3 BK BR FIELD WIRING NOTE 3 208-230 V 60 HZ CH TO INDOOR UNIT DS1 GR RD BK DS2 M1F X98A RD RD L2C RD NOISE FILTER BOARD L2A L2B L1A L1B BL X52A SHARE DATA X202A GR 1 2 NOTE 1 ON OFF Z2C 1 2 NOTE 1 ON OFF X99A X851A X101A TERMINAL BLOCK X28A 1 2 R C W1 Y1
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.
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.
Outdoor normal temperature operating range: 67-115°F / Indoor normal temperature operating range: 65-85°F 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.
Troubleshooting ClimateTalk Fault Code PCB LED Display Transmitted ClimateTalk Message 12 E12 OD CTRL FAIL1 13 14 15 16 E13 - E15 - Thermostat Fault Indicates a general memory error. Probable Causes High electrical noise Faulty control board 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 Board detected a high current condition. Probable Causes Short circuit condition Stop valve not completely open Overcharge Faulty control board Faulty compressor 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 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) Setting No. Contents 1 Cool Airflow Trim High*1,*2 2 Cool Airflow Trim Int 3 Cool Airflow Trim Low 4 5 6 7 Cool Profile Cool Fan ON Delay Cool Fan OFF Delay Dehumidification Select*4 13 Airflow Trim Offset*1,*2 0: -15% 1: -10% 0: -15% 1: -10% 2: -5% 0: -15% 1: -10% 2: -5% 0: A 0: 5sec. 0: 30sec. 0: STD 1: OFF 0: 0% 2: -5% 3: 0% 3: 0% 4: 5% 5: 10% 3: 0% 4: 5% 5: 10% 1: B 1: 10sec. 1: 60sec. 2: A 3: B 1: +2.
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 condensing unit 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 AIR CONDITIONER. 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 Air Conditioner. 6. Select MAINTENANCE.
7. Select CHARGE MODE. off 8. Select ON. Press DONE to initiate CHARGE mode. (System will then run for 1 hour and either return to cooling mode if the thermostat is set for COOL mode, or stop if the thermostat is set for FAN or HEAT 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. Press OFF.
Field Selectable Boost Mode BOOST MODE enables the system to operate at increased compressor speed to satisfy unusual high loads. BOOST MODE is 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 applies to AVXC200**AB and GVXC20**AA or later model revisions.
4. Select YES to continue. Menu > ComfortNet User Menu 5. Select AIR CONDITIONER. Previous Menu Air Handler Help 6. Select SYS SETUP.
7. BOOST MD turns BOOST MODE OFF or ON. BOOST MODE is on by default. Previous Menu Help SET MAX CURRENT: OFF VERTICAL RISE: Outdoor Lower BOOST MD: ON BOOST TEMP: Always On OFF ON Cancel 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 5. 6. 7. 8. Select View / Edit Current Setup. Scroll down and select Dehumidification. Once open select Dehumidification Equipment: None. From the Dehumidification Menu select A/C with Low Speed Fan and click the green Done button. 9. Additional Dehumidification operational options can be selected in the resulting window. 10.
ComfortNet™ System Status Overview 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: TS Time Stamp 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.
• Maintenance Pump down and charge modes can be enabled within this menu. 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. • Equipment Test The mandatory system verification test is enabled from this menu, which enables a functional check of the equipment, in addition to ensuring proper stop valve position. This menu allows for the adjustment of several cooling performance variables.
The system can have Dehumidification operation in setting “STD”, “A”, “B” or “C” of “Dehumidification Select” based on dehumidification demand. Setting “STD” allows for the widest compressor operation range with lower CFM than Cooling mode. In the Enhanced Dehumidification (setting A, B and C) the indoor airflow is lower than Standard Dehumidification (STD). Setting “A” allows for the same compressor operation range as standard Dehumidification with lower CFM than standard dehumidification (STD).
AIR CONDITIONER ADVANCED FEATURE MENU DIAGNOSTICS SUBMENU ITEM INDICATION/USER MODIFIABLE OPTIONS C lear Faults N O o r YES Fault 1 Most recent Air Condi�oner Fault COMMENTS Selec ting "YES" c lears the fault histo ry.
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