25HCR
COMFORTt SERIES R---22 HEAT PUMPS
SIZES 18 TO 60
1---1/2 TO 5 NOMINAL TONS
Installation Instructions
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION RECOMMENDATIONS . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 10
Step 1 - Check Equipment & Jobsite . . . . . . . . . . . . . . . 3
Step 2 - Install on Solid Pad . . . . . . . . . . . . . . . . . . . . . . 3
Step 3 - Clearance Requirements . . . . . . . . . . . . . . . . . . 3
Step 4 - Operating Ambient . . . . . . . . . . . . . . . . . . . . . . 3
Step 5 - Install TXV . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 4
Step 6 - Check Defrost Thermostat . . . . . . . . . . . . . . . . . 4
Step 7 - Make Piping Connections . . . . . . . . . . . . . . 4 - 6
Step 8 - Make Electrical Connections . . . . . . . . . . . . 6 - 7
Step 9 - Compressor Crankcase Heater . . . . . . . . . . . . . 7
Step 10 - Install Electrical Accessories . . . . . . . . . . . . . . 7
Step 11 - Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 9
Step 12 - Check Charge . . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 13 - Final Checks . . . . . . . . . . . . . . . . . . . . . . . . . . 10
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . 10
A05341
Fig. 1 --- 25HCR
NOTE: Read the entire instruction manual before starting the installation.
25HCR
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes and National Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety-alert symbol ! . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.
Understand these signal words; DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Before installing, modifying, or servicing system, main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch. Lock out and tag switch with a suitable warning label.
INSTALLATION RECOMMENDATIONS
NOTE: In some cases noise in the living area has been traced to gas pulsations from improper installation of equipment.
1.Locate unit away from windows, patios, decks, etc. where unit operation sound may disturb customer.
2.Ensure that vapor and liquid tube diameters are appropriate for unit capacity.
3.Run refrigerant tubes as directly as possible by avoiding unnecessary turns and bends.
4.Leave some slack between structure and unit to absorb vibration.
5.When passing refrigerant tubes through the wall, seal opening with RTV or other pliable silicon-based caulk. (See Fig. 2.)
6.Avoid direct tubing contact with water pipes, duct work, floor joists, wall studs, floors, and walls.
7.Do not suspend refrigerant tubing from joists and studs with a rigid wire or strap which comes in direct contact with tubing.(See Fig. 2.)
8.Ensure that tubing insulation is pliable and completely surrounds vapor tube.
9.When necessary, use hanger straps which are 1 in. wide and conform to shape of tubing insulation. (See Fig. 2.)
10.Isolate hanger straps from insulation by using metal sleeves bent to conform to shape of insulation.
NOTE: Avoid contact between tubing and structure
OUTDOOR WALL INDOOR WALL
CAULK
LIQUID TUBE
VAPOR TUBE
INSULATION
THROUGH THE WALL
JOIST
HANGER STRAP
(AROUND VAPOR
TUBE ONLY) INSULATION VAPOR TUBE
1″ MIN. 
LIQUID TUBE
SUSPENSION
A94028
Fig. 2 --- Connecting Tubing Installation
When outdoor unit is connected to factory-approved indoor unit, outdoor unit contains system refrigerant charge for operation with ARI rated indoor unit when connected by 15 ft. of field-supplied or factory accessory tubing. For proper unit operation, check refrigerant charge using charging information located on control box cover and/or in the Check Charge section of this instruction.
IMPORTANT: Maximum liquid-line size is 3/8-in. OD for all residential applications including line line.
IMPORTANT: Always install the factory-supplied liquid-line filter drier. Obtain replacement filter driers from your distributor or branch.
2
INSTALLATION STEP 1 —Check Equipment and Job Site Unpack Unit
Move to final location. Remove carton taking care not to damage unit.
Inspect Equipment
File claim with shipping company prior to installation if shipment is damaged or incomplete. Locate unit rating plate on unit corner panel. It contains information needed to properly install unit. Check rating plate to be sure unit matches job specifications.
STEP 2 —Install on a Solid, Level Mounting Pad
If conditions or local codes require the unit be attached to pad, tie down bolts should be used and fastened through knockouts provided in unit base pan. Refer to unit mounting pattern in Fig. 3 to determine base pan size and knockout hole location.
For hurricane tie downs, contact distributor for details and PE Certification (Professional Engineer), if required.
On rooftop applications, mount on level platform or frame. Place unit above a load-bearing wall and isolate unit and tubing set from structure. Arrange supporting members to adequately support unit and minimize transmission of vibration to building. Consult local codes governing rooftop applications.
Roof mounted units exposed to winds above 5 mph may require wind baffles. Consult the Service Manual - Residential Split System Air Conditioners and Heat Pumps for wind baffle construction.
NOTE: Unit must be level to within ±2° (±3/8 in./ft.) per compressor manufacturer specifications.
STEP 3 —Clearance Requirements
When installing, allow sufficient space for airflow clearance, wiring, refrigerant piping, and service. Allow 30-in. clearance to service end of unit and 48 in. above unit. For proper airflow, a 6-in. clearance on 1 side of unit and 12 in. on all remaining sides must be maintained. Maintain a distance of 24 in. between units. Position so water, snow, or ice from roof or eaves cannot fall directly on unit.
3/8---in. Dia. Tiedown
Knockouts in Basepan
(2) Places
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View From Top |
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UNIT BASE PAN |
TIEDOWN KNOCKOUT LOCATIONS |
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DIMENSIONS |
A |
B |
C |
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26 X 26 |
9–1/8 |
4–7/16 |
21–1/4 |
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31–1/2 X 31–1/2 |
9–1/8 |
6–9/16 |
24–11/16 |
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35 X 35 |
9–1/8 |
6–9/16 |
28–7/16 |
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A05177
Fig. 3 --- Clearance Requirements
On rooftop applications, locate unit at least 6 in. above roof surface.
STEP 4 —Operating Ambient
The minimum outdoor operating ambient in cooling mode is 55°F, and the maximum outdoor operating ambient in cooling mode is 125°F. The maximum outdoor operating ambient in heating mode is 66 °F.
STEP 5 —Install TXV
NOTE: Applies to non-TXV indoor units only. If installing a rated and approved indoor coil without a factory installed R-22 TXV, remove and replace the fixed orifice or PuronR TXV expansion device with an R-22 TXV.
!CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment damage or improper operation.
All indoor coil units must be installed with a hard shut off R-22 TXV metering device.
IMPORTANT: If not factory installed, the TXV should be mounted as close to the indoor coil as possible and in a vertical, upright position. Avoid mounting the inlet tube vertically down. Valve is more susceptible to malfunction due to debris if inlet tube is facing down. A factory-approved filter drier must be installed in the liquid line.
Installing TXV in Place of Piston
1.Pump system down to 2 psig and recover refrigerant.
2.Remove hex nut from piston body. Use backup wrench on fan coils.
3.Remove and discard factory-installed piston. Be sure Teflon seal is in place.
4.Reinstall hex nut. Finger tighten nut plus 1/2 turn. NOTE: If the piston is not removed from the body, TXV will not function properly.
!CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or improper operation.
Use a brazing shield and wrap TXV with wet cloth or use heat sink material.
5.Install TXV on indoor coil liquid line. Sweat swivel adapter to inlet of indoor coil and attach to TXV outlet. Use backup wrench to avoid damage to tubing or valve. Sweat inlet of TXV, marked “IN” to liquid line. Avoid excessive heat which could damage valve.
6.Install vapor elbow with equalizer adapter to suction tube of line set and suction connection to indoor coil. Adapter has a 1/4-in. male connector for attaching equalizer tube.
7.Connect equalizer tube of TXV to 1/4-in. equalizer fitting on vapor line adapter.
8.Attach TXV bulb to horizontal section of suction line using clamps provided. Insulate bulb with field-supplied insulation tape. See Fig. 4 for correct positioning of sensing bulb.
9.Proceed with remainder of unit installation.
25HCR
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