Goodman DSZC160241AA, DSZC160241AB, DSZC160241AC, DSZC160361AA, DSZC160361AB Installation Manual
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CONDENSING UNIT
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.
SHIPPING INSPECTION
Always keep the unit upright; laying the unit on its side or top may cause equipment damage. Shipping damage, and subsequent investigation is the responsibility of the carrier. Verify the model number, specifications, electrical characteristics, and accessories are correct prior to installation. The distributor or manufacturer will not accept claims from dealers for transportation damage or installation of incorrectly shipped units.
CODES & REGULATIONS
This product is designed and manufactured to comply with national codes. Installation in accordance with such codes and/or prevailing local codes/regulations is the responsibility of the in-
staller. The manufacturer assumes no responsibility for equipment installed in violation of any codes or regulations. Rated
performance is achieved after 72 hours of operation. Rated performance is delivered at the specified airflow. See outdoor unit specification sheet for split system models or product specification sheet for packaged and light commercial models. Specification sheets can be found at www.goodmanmfg.com for
Goodman® brand products or www.amana-hac.com for Amana® brand products. Within either website, please select the residential or commercial products menu and then select the submenu for the type of product to be installed, such as air conditioners or heat pumps, to access a list of product pages that each contain links to that model’s specification sheet.
The United States Environmental Protection Agency (EPA) has issued various regulations regarding the introduction and disposal of refrigerants. Failure to follow these regulations may harm the environment and can lead to the imposition of substantial fines. Should you have any questions please contact the local office of the EPA.
If replacing a condensing unit or air handler, the system must be manufacturer approved and Air Conditioning, Heating and Refrigeration Institute (AHRI) matched. NOTE: Installation of unmatched systems is strongly discouraged.
Outdoor units are approved for operation above 55°F in cooling mode. Operation below 55°F in cooling mode requires the use of an approved low ambient kit.
Operating the unit in a structure that is not complete (either as part of new construction or renovation) will void the warranty.
FEATURES
This heat pump is a part of the ComfortNet™ family of products. It may be installed as part of a “legacy” system using a standard 24 VAC thermostat. However, with the CTK0* ComfortNet™ thermostat kit, this heat pump may be installed as part of a digitally communicating system. The ComfortNet system provides automatic airflow configuration, enhanced setup features, and enhanced diagnostics. It also reduces the number of thermostat wires to a maximum of four and a minimum of two.
is a registered trademark of Maytag Corporation or its related companies and is used under license to Goodman Company, L.P., Houston, TX. All rights reserved.
INSTALLATION CLEARANCES
Special consideration must be given to location of the condensing unit(s) in regard to structures, obstructions, other units, and any/ all other factors that may interfere with air circulation. Where possible, the top of the unit should be completely unobstructed; however, if vertical conditions 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.
Another important consideration in selecting a location for the unit(s) is the angle to obstructions. Either side adjacent the valves can be placed toward the structure provided the side away from the structure maintains minimum service clearance. Corner installations are strongly discouraged.
This unit can be located at ground floor level or on flat roofs. At ground floor level, the unit must be on a solid, level foundation that will not shift or settle. To reduce the possibility of sound transmission, the foundation slab should not be in contact with or be an integral part of the building foundation. Ensure the foundation is sufficient to support the unit. A concrete slab raised above ground level provides a suitable base.
ROOFTOP INSTALLATIONS
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RECOMMENDED |
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A |
AA |
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B |
OK! |
B
OK!
AA
OK!
OK!
OK! 
Minimum Airflow Clearance
Model Type |
A |
B |
C |
AA |
Residential |
10" |
10" |
18" |
20" |
Light Commercial |
12" |
12" |
18" |
24" |
If it is necessary to install this unit on a roof structure, ensure the roof structure can support the weight and that proper consideration is given to the weather-tight integrity of the roof. Since the unit can vibrate during operation, sound vibration transmission should be considered when installing the unit. Vibration absorbing pads or springs can be installed between the condensing unit legs or frame and the roof mounting assembly to reduce noise vibration.
NOTE: These units require special location consideration in areas of heavy snow accumulation and/or areas with prolonged continuous subfreezing temperatures. Heat pump unit bases have cutouts under the outdoor coil that permit drainage of frost accumulation. Situate the unit to permit free unobstructed drainage of the defrost water and ice. A minimum 3” clearance under the outdoor coil is required in the milder climates.
In more severe weather locations, it is recommended that the unit be elevated to allow unobstructed drainage and air flow. The elevation minimums at right are recommended:
SAFE REFRIGERANT HANDLING
Design Temperature |
Suggested Minimum Elevation |
+15° and above |
2 1/2" |
-5° to +14° |
8" |
below -5° |
12" |
While these items will not cover every conceivable situation, |
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WARNING |
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TO AVOID POSSIBLE INJURY, EXPLOSION OR DEATH, PRACTICE SAFE |
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HANDLING OF REFRIGERANTS. |
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WARNING
TO AVOID POSSIBLE EXPLOSION, USE ONLY RETURNABLE (NOT DISPOSABLE) SERVICE CYLINDERS WHEN REMOVING REFRIGERANT FROM A SYSTEM.
• ENSURE THE CYLINDER IS FREE OF DAMAGE WHICH COULD LEAD TO A LEAK OR EXPLOSION.
• ENSURE THE HYDROSTATIC TEST DATE DOES NOT EXCEED 5 YEARS.
• ENSURE THE PRESSURE RATING MEETS OR EXCEEDS 400 PSIG. WHEN IN DOUBT, DO NOT USE CYLINDER.
2
WARNING
REFRIGERANTS ARE HEAVIER THAN AIR. THEY CAN “PUSH OUT” THE OXYGEN IN YOUR LUNGS OR IN ANY ENCLOSED SPACE. TO AVOID POSSIBLE DIFFICULTY IN BREATHING OR DEATH:
• NEVER PURGE REFRIGERANT INTO AN ENCLOSED ROOM OR SPACE. BY LAW, ALL REFRIGERANTS MUST BE RECLAIMED.
• IF AN INDOOR LEAK IS SUSPECTED, THOROUGHLY VENTILATE THE AREA BEFORE BEGINNING WORK.
• LIQUID REFRIGERANT CAN BE VERY COLD. TO AVOID POSSIBLE FROST BITE OR BLINDNESS, AVOID CONTACT AND WEAR GLOVES AND GOGGLES. IF LIQUID REFRIGERANT DOES CONTACT YOUR SKIN OR EYES, SEEK MEDICAL
HELP IMMEDIATELY.
•ALWAYS FOLLOW EPA REGULATIONS. NEVER BURN REFRIGERANT, AS
POISONOUS GAS WILL BE PRODUCED.
WARNING
TO AVOID POSSIBLE EXPLOSION:
• NEVER APPLY FLAME OR STEAM TO A REFRIGERANT CYLINDER. IF YOU MUST HEAT A CYLINDER FOR FASTER CHARGING, PARTIALLY IMMERSE IT IN WARM WATER.
•NEVER FILL A CYLINDER MORE THAN 80% FULL OF LIQUID REFRIGERANT.
•NEVER ADD ANYTHING OTHER THAN R-22 TO AN R-22 CYLINDER OR R-
410A TO AN R-410A CYLINDER. THE SERVICE EQUIPMENT USED MUST BE LISTED OR CERTIFIED FOR THE TYPE OF REFRIGERANT USED.
•STORE CYLINDERS IN A COOL, DRY PLACE. NEVER USE A CYLINDER AS A
PLATFORM OR A ROLLER.
REFRIGERANT LINES |
CAUTION |
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Use only refrigerant grade (dehydrated and sealed) copper tubing to connect the condensing unit with the indoor evaporator. After cutting the tubing, install plugs to keep refrigerant tubing clean and dry prior to and during installation. Tubing should always be cut square keeping ends round and free from burrs. Clean the tubing to prevent contamination.
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 silicon-based caulk, RTV or a vibration damping material. Avoid suspending refrigerant tubing from joists and studs with rigid wire or straps that would come in contact with the tubing. Use an insulated or suspension type hanger. Keep both lines separate and always insulate the suction line.
These sizes are suitable for line lengths of 79 feet or less. If a run of more than eighty feet is required, refer to Remote Cooling Service Manual, or TP-106 Long Line Set Application R-22, or TP-107 Long Line Set Application R-410A or contact your distributor for assistance.
THE COMPRESSOR POE OIL FOR R-410A UNITS IS EXTREMELY SUSCEPTIBLE TO MOISTURE ABSORPTION AND COULD CAUSE COMPRESSOR FAILURE. DO NOT LEAVE SYSTEM OPEN TO ATMOSPHERE ANY LONGER THAN NECESSARY FOR INSTALLATION.
RECOMMENDED INTERCONNECTING TUBING (Ft)
Cond |
0-24 |
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25-49 |
50-79* |
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Unit |
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Line Diameter (In. OD) |
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Tons |
Suct |
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Liq |
Suct |
Liq |
Suct |
Liq |
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1 |
1/2 |
5/8 |
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3/4 |
3/8 |
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5/8 |
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3/4 |
3/8 |
3/4 |
3/8 |
2 |
1/2 |
5/8 |
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3/4 |
3/8 |
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3/4 |
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7/8 |
3/8 |
1 1/8 |
3/8 |
3 |
1/2 |
7/8 |
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1 1/8 |
3/8 |
1 1/8 |
3/8 |
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7/8 |
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1 1/8 |
3/8 |
1 1/8 |
3/8 |
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5 |
7/8 |
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3/8 |
1 1/8 |
3/8 |
1 1/8 |
3/8 |
* Lines greater than 79 feet in length or vertical elevation changes more than 50 feet refer to the Remote Cooling
Service Manual or contact your distributor for assistance.
Insulation is necessary to prevent condensation from forming and dropping from the suction line. Armaflex (or satisfactory equivalent) with 3/8” min. wall thickness is recommended. In severe conditions (hot, high humidity areas) 1/2” insulation may be required. Insulation must be installed in a manner which protects tubing from damage and contamination.
Where possible, drain as much residual compressor oil from existing systems, lines, and traps; pay close attention to low areas where oil may collect. NOTE: If changing refrigerant types, ensure the indoor coil and metering device is compatible with the type of refrigerant being used; otherwise, the indoor coil must be replaced.
3
BURYING REFRIGERANT LINES
If burying refrigerant lines can not be avoided, use the following checklist.
1. Insulate liquid and suction lines separately.
2. Enclose all underground portions of the refrigerant lines in waterproof material (conduit or pipe) sealing the ends where tubing enters/exits the enclosure.
3. If the lines must pass under or through a concrete slab, ensure lines are adequately protected and sealed.
REFRIGERANT LINE CONNECTIONS
IMPORTANT
To avoid overheating the service valve, TXV valve, 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.
Torch heat required to braze tubes of various sizes is proportional to the size of the tube. Tubes of smaller size
require less heat to bring the tube to brazing temperature before adding brazing alloy. Applying too much heat to any tube can melt the tube. Service personnel must use the appropriate heat level for the size of the tube being brazed. NOTE: The use of a heat shield when brazing is recommended to avoid burning the serial plate or the finish on the unit.
1.The ends of the refrigerant lines must be cut square, deburred, cleaned, and be round and free from nicks or dents. Any other condition increases the chance of a refrigerant leak.
2.“Sweep” the refrigerant line with nitrogen or inert gas during brazing to prevent the formation of copper-oxide inside the refrigerant lines. The POE oils used in R-410A applications will clean any copper-oxide present from the inside of the refrigerant lines and spread it throughout the system. This may cause a blockage or failure of the metering device.
3.After brazing, quench the joints with water or a wet cloth to prevent overheating of the service valve.
4.Ensure the filter drier paint finish is intact after brazing. If the paint of the steel filter drier has been burned or chipped, repaint or treat with a rust preventative. This is especially important on suction line filter driers which are continually wet when the unit is operating.
NOTE: Be careful not to kink or dent refrigerant lines. Kinked or dented lines will cause poor performance or compressor damage.
Do NOT make final refrigerant line connection until plugs are removed from refrigerant tubing.
NOTE: Before brazing, verify indoor TXV is correct for R410A and proper size.
LEAK TESTING (NITROGEN OR NITROGEN-TRACED)
Pressure test the system using dry nitrogen and soapy water to locate leaks. If you wish to use a leak detector, charge the system to 10 psi using the appropriate refrigerant then use nitrogen to finish charging the system to working pressure then apply the detector to suspect areas. If leaks are found, repair them. After repair, repeat the pressure test. If no leaks exist, proceed to system evacuation.
WARNING
TO AVOID THE RISK OF FIRE OR EXPLOSION, NEVER USE OXYGEN, HIGH
PRESSURE AIR OR FLAMMABLE GASES FOR LEAK TESTING OF A REFRIGERATION SYSTEM.
WARNING
TO AVOID POSSIBLE EXPLOSION, THE LINE FROM THE NITROGEN CYLINDER MUST INCLUDE A PRESSURE REGULATOR AND A PRESSURE RELIEF VALVE. THE PRESSURE RELIEF VALVE MUST BE SET TO OPEN AT NO MORE THAN 150 PSIG.
4
SYSTEM EVACUATION
Condensing unit liquid and suction valves are closed to contain the charge within the unit. The unit is shipped with the valve stems closed and caps installed. Do not open valves until the system is evacuated.
NOTE: Scroll compressors should never be used to evacuate or pump down a heat pump or air conditioning system.
1.Connect the vacuum pump with 250 micron capability to the service valves.
2.Evacuate the system to 250 microns or less using suction and liquid service valves. Using both valves is necessary as some compressors create a mechanical seal separating the sides of the system.
3.Close pump valve and hold vacuum for 10 minutes. Typically pressure will rise during this period.
•If the pressure rises to 1000 microns or less and remains steady the system is considered leak-free; proceed to startup.
•If pressure rises above 1000 microns but holds steady below 2000 microns, moisture and/or noncondensibles may be present or the system may have a small leak. Return to step 2: If the same result is encountered check for leaks as previously indicated and repair as necessary then repeat evacuation.
WARNING
REFRIGERANT UNDER PRESSURE!
FAILURE TO FOLLOW PROPER PROCEDURES MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
CAUTION
PROLONGED OPERATION AT SUCTION PRESSURES LESS THAN 20 PSIG FOR MORE THAN 5 SECONDS WILL RESULT IN OVERHEATING OF THE SCROLLS AND PERMANENT DAMAGE TO THE SCROLL TIPS, DRIVE BEARINGS AND INTERNAL SEAL.
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MICRONSIN |
4500 |
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3000 |
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4000 |
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3500 |
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LEAK(S) |
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PRESENT |
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ACUUMV |
2000 |
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2500 |
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1500 |
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CONDENSIBLES OR SMALL |
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LEAK PRESENT |
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1000 |
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NO LEAKS |
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500 |
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NO CONDENSIBLES |
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MINUTES |
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•If pressure rises above 2000 microns, a leak is present. Check for leaks as previously indicated and repair as necessary then repeat evacuation.
ELECTRICAL CONNECTIONS
The condensing unit rating plate lists pertinent electrical data necessary for proper electrical service and overcurrent protection. Wires should be sized to limit voltage drop to 2% (max.) from the main breaker or fuse panel to the condensing unit. Consult the NEC, CEC, and all local codes to determine the correct wire gauge and length.
Local codes often require a disconnect switch located near the unit; do not install the switch on the unit. Refer to the installation instructions supplied with the indoor furnace/air handler for specific wiring connections and indoor unit configuration. Likewise, consult the instructions packaged with the thermostat for mounting and location information.
OVERCURRENT PROTECTION
The following overcurrent protection devices are approved for use.
•Time delay fuses
•HACR type circuit breakers
WARNING
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE
TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO ELECTRIC SHOCK. WIRING MUST CONFORM WITH NEC OR CEC AND ALL LOCAL CODES. UNDERSIZED WIRES COULD CAUSE POOR EQUIPMENT PERFORMANCE, EQUIPMENT DAMAGE OR FIRE.
WARNING
TO AVOID THE RISK OF FIRE OR EQUIPMENT DAMAGE, USE COPPER CONDUCTORS.
These devices have sufficient time delay to permit the motor-compressor to start and accelerate its load.
HIGH VOLTAGE CONNECTIONS
Route power supply and ground wires through the high voltage port and terminate in accordance with the wiring diagram provided inside the control panel cover.
5
LOW VOLTAGE CONNECTIONS
Condensing unit control wiring requires a nominal 24 VAC (+/- 6 VAC), 60 Hz, minimum 25 VA service from either the indoor or an optional outdoor transformer. Low voltage wiring for the condensing units depends on the thermostat used. The unit is designed to work as part of a fully communicating HVAC system utilizing the ComfortNet™ CTK0* thermostat, ComfortNet™ compatible indoor unit, and up to four wires.
The unit also has legacy 24 VAC inputs to support non-communi- cating systems. Route control wires through the low voltage port and terminate in accordance with the wiring diagram provided inside the control panel cover.
NOTE: For two-stage units, refer to the Installation Instructions supplied with the variable speed indoor units for field wiring connections.
NOTE: If the heat pump unit is wired in the communicating mode with a compatible communicating indoor unit and CTK0* communicating thermostat, then the communicating thermostat is able to search and the condensing unit when power is applied to the system. Refer to the Installation Manual of the optional communicating thermostat for more information.
Use the dipswitch to select defrost time interval (30, 60, 90, 120 minutes; see chart below).
Factory default setting is 30 minutes. The maximum defrost cycle 10 minutes.
SYSTEM START UP
NOTE: Power must be supplied to the 18 SEER outdoor units containing ECM motors before the power is applied to the indoor unit. Sending a low voltage signal without high voltage power present at the outdoor unit can cause malfunction of the control module on the ECM motor.
HIGH
VOLTAGE
PORT
Voltage Ports |
LOW |
VOLTAGE |
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60 |
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30 |
60 |
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30 |
together |
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60 |
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60 |
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identify |
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30 Minutes |
60 Minutes |
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60 |
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30 |
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30 |
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60 |
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time is |
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90 Minutes |
120 Minutes |
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Adequate refrigerant charge for the matching evaporator coil or air handler and 15 feet of lineset is supplied with the condensing unit. If using evaporator coils or air handlers other than
HSVTC coil it maybe necessary to add or remove refrigerant to attain proper charge. If line set exceeds 15 feet in length, refrigerant should be added at .6 ounces per foot of liquid line.
NOTE: Charge should always be checked using superheat when using a piston and subcooling when using TXV equipped indoor coil to verify proper charge.
Open the suction service valve first! If the liquid service valve is opened first, oil from the compressor may be drawn into the indoor coil TXV, restricting refrigerant flow and affecting operation of the system.
When opening valves with retainers, open each valve only until the top of the stem is 1/8” from the retainer. To avoid loss of refrigerant, DO NOT apply pressure to the retainer. When opening valves without a retainer remove service valve cap and insert a hex wrench into the valve stem and back out the stem by turning the hex wrench counterclockwise. Open the valve until it contacts the rolled lip of the valve body.
NOTE: These are not back-seating valves. It is not necessary to force the stem tightly against the rolled lip.
After the refrigerant charge has bled into the system, open the liquid service valve. The service valve cap is the secondary seal for the valve and must be properly tightened to prevent leaks. Make sure cap is clean and apply refrigerant oil to threads and sealing surface on inside of cap. Tighten cap finger-tight and then tighten additional 1/6 of a turn (1 wrench flat) to properly seat the sealing surfaces.
6
Do not introduce liquid refrigerant from the cylinder into the crankcase of the compressor as this may damage the compressor.
1.Break vacuum by fully opening liquid and suction base valves.
2.Set thermostat to call for cooling. Check indoor and outdoor fan operation and allow system to stabilize for 10 minutes for fixed orifices and 20 minutes for expansion valves.
CHARGE VERIFICATION
CAUTION
USE REFRIGERANT CERTIFIED TO AHRI STANDARDS. USED REFRIGERANT MAY CAUSE COMPRESSOR DAMAGE, AND IS NOT COVERED UNDER THE WARRANTY. MOST PORTABLE MACHINES CANNOT CLEAN USED REFRIGERANT TO MEET AHRI STANDARDS.
WARNING
REFRIGERANT UNDER PRESSURE!
•DO NOT OVERCHARGE SYSTEM WITH REFRIGERANT.
•DO NOT OPERATE UNIT IN A VACUUM OR AT NEGATIVE PRESSURE. FAILURE TO FOLLOW PROPER PROCEDURES MAY CAUSE PROPERTY
DAMAGE, PERSONAL INJURY OR DEATH.
NOTICE
VIOLATION OF EPA REGULATIONS MAY RESULT IN FINES OR OTHER |
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CAUTION |
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OPERATING THE COMPRESSOR WITH THE SUCTION VALVE CLOSED MAY |
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PENALTIES. |
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CAUSE SERIOUS COMPRESSOR DAMAGE.
FINAL CHARGE ADJUSTMENT
The outdoor temperature must be 60°F or higher. Set the room thermostat to COOL, fan switch to AUTO, and set the temperature control well below room temperature.
After system has stabilized per startup instructions, check subcooling and superheat as detailed in the following section.
SATURATED SUCTION PRESSURE
TEMPERATURE CHART
SUCTION PRESSURE |
SATURATED SUCTION |
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TEMPERATURE ºF |
|||
|
|||
PSIG |
R-22 |
R-410A |
|
|
|
|
|
50 |
26 |
1 |
|
52 |
28 |
3 |
|
54 |
29 |
4 |
|
56 |
31 |
6 |
|
58 |
32 |
7 |
|
60 |
34 |
8 |
|
62 |
35 |
10 |
|
64 |
37 |
11 |
|
66 |
38 |
13 |
|
68 |
40 |
14 |
|
70 |
41 |
15 |
|
72 |
42 |
16 |
|
74 |
44 |
17 |
|
76 |
45 |
19 |
|
78 |
46 |
20 |
|
80 |
48 |
21 |
|
85 |
50 |
24 |
|
90 |
53 |
26 |
|
95 |
56 |
29 |
|
100 |
59 |
31 |
|
110 |
64 |
36 |
|
120 |
69 |
41 |
|
130 |
73 |
45 |
|
140 |
78 |
49 |
|
150 |
83 |
53 |
|
160 |
86 |
56 |
|
170 |
90 |
60 |
|
SATURATED LIQUID PRESSURE
TEMPERATURE CHART
LIQUID PRESSURE |
SATURATED LIQUID |
||
TEMPERATURE ºF |
|||
|
|||
|
|
|
|
PSIG |
R-22 |
R-410A |
|
|
|
|
|
200 |
101 |
70 |
|
210 |
105 |
73 |
|
220 |
108 |
76 |
|
225 |
110 |
78 |
|
235 |
113 |
80 |
|
245 |
116 |
83 |
|
255 |
119 |
85 |
|
265 |
121 |
88 |
|
275 |
124 |
90 |
|
285 |
127 |
92 |
|
295 |
130 |
95 |
|
305 |
133 |
97 |
|
325 |
137 |
101 |
|
355 |
144 |
108 |
|
375 |
148 |
112 |
|
405 |
155 |
118 |
|
415 |
157 |
119 |
|
425 |
n/a |
121 |
|
435 |
n/a |
123 |
|
445 |
n/a |
125 |
|
475 |
n/a |
130 |
|
500 |
n/a |
134 |
|
525 |
n/a |
138 |
|
550 |
n/a |
142 |
|
575 |
n/a |
145 |
|
600 |
n/a |
149 |
|
625 |
n/a |
152 |
|
7
EXPANSION VALVE SYSTEM
NOTE: Units matched with indoor coils equipped with non-adjustable TXV should be charged by subcooling only.
Run the unit on low stage cooling for 10 minutes until refrigerant pressures stabilize. Use the following guidelines and methods to check unit operation and ensure that the refrigerant charge is within limits. Charge the unit on low stage.
CAUTION
TO PREVENT PERSONAL INJURY, CAREFULLY CONNECT AND DISCONNECT MANIFOLD GAUGE HOSES. ESCAPING LIQUID REFRIGERANT CAN CAUSE BURNS. DO NOT VENT REFRIGERANT INTO THE ATMOSPHERE. RECOVER ALL REFRIGERANT DURING SYSTEM REPAIR AND BEFORE FINAL UNIT DISPOSAL.
1.Purge gauge lines. Connect service gauge manifold to base-valve service ports. Run system at least 10 minutes to allow pressure to stabilize.
2.Temporarily install a thermometer on the liquid line at the liquid line service valve and 4-6" from the compressor on the suction line. Ensure the thermometer makes adequate contact and is insulated for best possible readings. Use liquid line temperature to determine subcooling and vapor temperature to determine superheat.
3.Check subcooling and superheat. Systems with TXV application should have a subcooling of 5 to 7°F and superheat of 7 to 9 °F.
a.If subcooling and superheat are low, adjust TXV to 7 to 9 ºF superheat, then check subcooling.
NOTE: To adjust superheat, turn the valve stem clockwise to increase and counter clockwise to decrease.
b.If subcooling is low and superheat is high, add charge to raise subcooling to 5 to 7 °F then check superheat.
c.If subcooling and superheat are high, adjust TXV valve to 7 to 9 ºF superheat, then check subcooling.
d.If subcooling is high and superheat is low, adjust TXV valve to 7 to 9 ºF superheat and remove charge to lower the subcooling to 5 to 7 ºF.
NOTE: Do NOT adjust the charge based on suction pressure unless there is a gross undercharge. 4. Disconnect manifold set, installation is complete.
SUBCOOLING FORMULA = SAT. LIQUID TEMP. - LIQUID LINE TEMP.
NOTE: Check the Schrader ports for leaks and tighten valve cores if necessary. Install caps finger-tight.
HEAT PUMP - HEATING CYCLE
The proper method of charging a heat pump in the heat mode is by weight with the additional charge adjustments for line size, line length, and other system components. For best results on outdoor units with TXVs, superheat should be 2-5° at 4-6" from the compressor. Make final charge adjustments in the cooling cycle.
ADDITIONAL NOTES
1.There are (3) 7-segment LED displays on the PCB. Refer to the Troubleshooting chart at the end of this manual for definitions of the LED status.
2.“TERM” dip switch is used for communications bus configuration. Leave the settings to the factory default position.
3.“LEARN” push button is used in communication mode to support device recognition on start-up. As the communication system supports automatic identification of both indoor unit and outdoor unit, this button is not used for a normal start-up.
4.Press “TEST” push button, during system “Standby” mode to turn on both the compressor and outdoor fan for five seconds.
5.The “RECALL” push button is used to retrieve the six most recent faults. The control must be in Standby Mode (no thermostat inputs) to use the feature. Depress the push button for approximately two seconds and less than five seconds. The 7-segment LED displays will then display the six most recent faults beginning with the most recent fault and decrementing to the least recent fault. The faults may be cleared by depressing the button for greater than five seconds. Consecutively repeated faults are displayed a maximum of three times. Refer to the fault code definitions at the end of this manual for more details.
6.A forced defrost can be initiated by pressing “TEST” and “RECALL” push buttons simultaneously for more than 1 second with a valid call for heat. The forced defrost can be terminated by
•A 10 minute lapse in time,
•A coil temperature rise above 75°F or
•By pressing the two buttons again for more than 1 second.
8
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