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INSTALLATION INSTRUCTIONS
NS18HMA
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to
the potential for personal injury or death.
Installation and servicing of air conditioning equipment
can be hazardous due to internal refrigerant pressure
and live electrical components. Only trained and
qualified service personnel should install or service
this equipment. Installation and service performed by
unqualified persons can result in property damage,
personal injury, or death.
ELECTRICAL SHOCK HAZARD!
Risk of electrical shock. Disconnect all
remote power supplies before installing
or servicing any portion of the system.
Failure to disconnect power supplies
can result in property damage, personal
injury, or death.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting
of refrigerant (CFCs, HCFCs and HFCs) as of July
1, 1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incarceration
may be levied for noncompliance.
GE Appliances
A Haier Company
Appliance Park
Louisville, KY 40225
508133G01 / 31-5000715
This manual must be left with the homeowner for future reference.
WARNING
WARNING
Split Heat Pump System
Table of Contents
Application ...................................................................1
General ........................................................................2
Installation ...................................................................2
Refrigerant Piping ........................................................4
Electrical - Circuit Sizing and Wire Routing ...............13
Outdoor Unitary Control.............................................17
Unit Operation ...........................................................19
Start-Up .....................................................................20
Maintenance ..............................................................22
Homeowner Information ............................................22
Start-Up and Performance Checklist .........................25
Sharp metal edges can cause injury. When installing
the unit, use care to avoid sharp edges.
Application
These units are designed for use in residential and light
commercial type buildings. Units should be installed with
approved indoor matches listed in the Air-Conditioning,
Heating and Refrigeration Institute (AHRI) Directory of
Certified Products. Refer to http://www.ahridirectory.org.
*P508133G01*
Issue 2140
High Efficiency
WARNING
(P) 508133G01
Page 1 of 25
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Summary of Contents for GE NS18HMA
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS High Efficiency NS18HMA Split Heat Pump System This manual must be left with the homeowner for future reference. This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death. -
Page 2: General
Handle refrigerant with caution; refer to proper MSDS General from refrigerant supplier. Use care when lifting, avoid contact with sharp edges. Read this entire instruction manual, as well as the instructions supplied in separate equipment, before Installation starting the installation. Observe and follow all warnings, cautions, instructional labels, and tags. - Page 3 TXV. See Refrigerant Piping - Refer to Table 1 for installation clearances. Typical Existing Expansion Valve Removal Procedure for details of changing the piston or TXV. The NS18HMA Location Minimum Clearance models are only rated with TXV on the indoor coil.
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Page 4: Refrigerant Piping
DO LOCATE THE UNIT: • Ensure that tubing insulation is pliable and completely surrounds vapor tube. • With proper clearances on sides and top of unit It is important that no tubing be cut or seals broken until you • On a solid, level foundation or pad (unit must be level are ready to actually make connections to the evaporator to within ±... - Page 5 NOTE: Length is general guide. Lengths may be more or less, depending on remaining system design WARNING factors. Polyvinyl ether (PVE) oils used with HFC-410A • Maximum linear (actual) length = 150 feet. refrigerant absorb moisture very quickly. It is very •...
- Page 6 Total Linear Length (ft.) Tonnage Line SIze 3/8” 3/8” 1/2” 3/8” 1/2” 3/8” 1/2” NOTE: Shaded rows indicate rated liquid line size. A. Find your tonnage on the left side of the table. B. Start with the rated liquid line size (shaded row) on the outdoor tonnage. C.
- Page 7 Disconnect the liquid line from the expansion valve at the liquid line assembly. WARNING Disconnect the expansion valve from the liquid line orifice housing. Take care not to twist or damage Fire, Explosion and Personal Safety distributor tubes during this process. hazard.
- Page 8 Refrigerant Piping - Install Indoor Expansion Valve This outdoor unit is designed for use in systems that include a heat pump expansion valve metering device at the indoor coil. See the Product Specifications for approved expansion valve kit match-ups and application information. The expansion valve unit can be installed internal or external to the indoor coil.
- Page 9 Refrigerant Piping - Brazing Procedures CAP AND CORE REMOVAL CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) Remove service cap and core from and debur the ends. The pipe must remain round. Do not crimp end both the vapor and liquid line service of the line.
- Page 10 WRAP SERVICE VALVES To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use additional water-saturated cloths underneath the valve body to protect the base paint. FLOW NITROGEN Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the vapor valve stem port.
- Page 11 Leak Test and Evacuation LEAK TEST HIGH MANIFOLD GAUGE SET OUTDOOR UNIT TO VAPOR SERVICE VALVE NOTE - Position canister to deliver liquid refrigerant. NITROGEN HFC-410A CONNECT GAUGE SET A - Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port. NOTE - Normally, the high pressure hose is connected to the liquid line port.
- Page 12 EVACUATION HIGH CONNECT GAUGE SET NOTE - Remove cores from service valves (if not already done). A - Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve B - Connect high side of manifold gauge set to OUTDOOR MANIFOLD liquid line service valve...
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Page 13: Electrical - Circuit Sizing And Wire Routing
(R, C, W1, Failure to use properly sized wiring and circuit breaker O, Y1 and Y2). Refer to the NS18HMA field wiring diagram may result in property damage. Size wiring and circuit for a conventional 24VAC two-stage thermostat. - Page 14 Figure 9 Handler (Jumper Y1 to Y2) Cooling Thermostat Control Using Suction Pressure Table 6. NS18HMA Thermostat Control Options Size Circuit and Install Service Disconnect Install Thermostat Switch Install room thermostat (ordered separately) on an inside wall approximately in the center of the conditioned area Refer to the unit nameplate for minimum circuit ampacity, and 5 feet (1.5m) from the floor.
- Page 15 Table 7. Conventional 24VAC Thermostat Wiring Connect the 208/230 high voltage power supply from the disconnect to the NS18HMA contactor as shown. Connect the ground wire from the power supply to the unit ground lug connection. 508133G01 / 31-5000715...
- Page 16 ACC2 ACC2 ACC1 ACC1 RAST 6-PIN RAST 6-PIN CONNECTOR CONNECTOR RAST 6-PIN RAST 6-PIN CONNECTOR CONNECTOR VARIABLE CAPACITY TWO STAGE / CONVENTIONAL 24VAC VARIABLE CAPACITY TWO STAGE / CONVENTIONAL 24VAC OUTDOOR UNIT VARIABLE SPEED THERMOSTAT OUTDOOR UNIT VARIABLE SPEED THERMOSTAT GAS FURNACE GAS FURNACE FOR SINGLE STAGE OPERATION INSTALL A JUMPER BETWEEN Y1 TO Y2 ON THE OUTDOOR UNIT...
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Page 17: Outdoor Unitary Control
The NS18HMA units are programmed from the factory to function in 3 Ton and 5 Ton modes of operation. If the Push and hold button until the code for the correct unit intended capacity for the application is 3 or 5 Ton, skip this type is displayed. - Page 18 Charge Mode Pins after providing a cooling compressor that will vary with the outdoor temperature; as the outdoor demand to the NS18HMA and an “O” cooling reversing temperature increases the suction pressure setpoint will valve demand to initiate the Charge Mode. A cooling decrease.
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Page 19: Unit Operation
24VAC heat pump thermostat, the compressor capacity is 24VAC 2-Stage Thermostat controlled to maintain the target liquid pressure setpoint. When the NS18HMA unit is installed with a conventional The Heating Operation Mode Jumper has two selectable 24VAC 2-stage thermostat, a Y1 first stage heating or heating modes. -
Page 20: Start-Up
Oz. Per 5 ft. adjust from 15 Start-Up Liquid Line Set Diameter ft. line set* 3 oz. per 5 ft. 3/8 in. or 0.6 oz. per 1 ft. CAUTION * If line length is greater than 15 ft., add this amount. If line If unit is equipped with a crankcase heater, it should length is less than 15 ft., remove this amount. - Page 21 Torque Requirements To Access the Schrader Port: When servicing or repairing HVAC components, ensure Remove the service port cap with an adjustable the fasteners are appropriately tightened. Table 12 shows wrench. torque values for fasteners. Connect gauge to the service port. Fastener Torque When testing is completed, replace service port cap.
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Page 22: Maintenance
Maintenance WARNING SHARP OBJECT HAZARD! Regular Maintenance Requirements Your system should be regularly inspected by a qualified Condenser coils have sharp edges. Wear adequate service technician. These regular visits may include body protection on body extremities (e.g. gloves). (among other things) checks for: FAILURE TO FOLLOW THIS WARNING COULD •... - Page 23 defrost cycle to satisfy a heating demand; however, Programmable Thermostats the unit will run to normal operation at the conclusion Your system may be controlled by a programmable of the defrost cycle. thermostat. These thermostats provide the added feature of programmable time-of-day set points for both heating and In case of extended power outage...
- Page 24 Figure 15. Wiring Diagram Page 24 of 25 Issue 2140 508133G01 / 31-5000715...
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Page 25: Start-Up And Performance Checklist
Start-Up and Performance Checklist Customer: _____________________________________ Address: _______________________________________ Indoor Unit Model: _______________________________ Serial: _________________________________________ Outdoor Unit Model: ______________________________ Serial: _________________________________________ Notes: __________________________________________________________________________________________ Start-Up Checks Refrigerant Type: _____________________ Rated Load Amps: ____________________ Actual Amps: ______ Rated Volts: _______ Actual Volts: ________ Condenser Fan Full Load Amps: _________ Actual Amps: ______ Cooling Mode Suction Pressure: ____________________ Liquid Pressure: _________...