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Page  51

31-5000751   Rev. 0

Y1 DEMAND 

OR COOLING 

DEMAND

LOW 

PRESSURE  

CLOSED 

(S87)

CONTACTOR

ENERGIZED

SUCTION 

PRESSURE

CUT-OUT IS

IGNORED FOR

90 SECONDS

LOW PRESSURE

(S87)

CONTACTOR

DE-ENERGIZED

ANTI-SHORT

CYCLE TIMER

BEGINS

INCREMENT

5-STRIKE

COUNTER

1

LED ALERT

CODE / OR

MODERATE

ALERT 410

DISPLAYED

ANTI-SHORT

CYCLE TIMER

ENDS

CONTACTOR

ENERGIZED

WAITING FOR

PRESSURE

TO RISE ABOVE

90 PSIG

OUTDOOR AMBIENT

TEMPERATURE IS 15ºF 

OR BELOW

SWITCH IS CLOSED OR 

3

5-STRIKE

COUNTER

REACHES 5

WITHIN A SINGLE

Y1 DEMAND

LOW

PRESSURE

LOCKOUT

LED ALERT

CODE / OR

CRITICAL

ALERT 411

DISPLAYED

SERVICE

REQUIRED

2

LED ALERT

CODE / OR

MODERATE

ALERT 410

DISPLAYED

SERVICE

REQUIRED

2

NORMAL

OPERATION

CLOSED

CLOSED

OPEN

OPEN

OPEN

CLOSED

CLOSED

1.

The thermostat terminates demand when the contactor

is de-energized. If demand is satisfied when alarm is

not active, the 5-strike counter resets.

2.

door control (A175) 

R

 terminal.

3.

The low pressure switch is ignored when

the outdoor temperature is below 15°F.

LOW PRESSURE 

SWITCH

S87

NO

Figure 22. Low Pressure Switch (S87) Sequence of Operation (All Units)

Summary of Contents for GE NS18HM

Page 1: ...31 5000751 Rev 0 11 22 GEA READ CAREFULLY KEEP THESE INSTRUCTIONS NS18HM VARIABLE SPEED HIGH EFFICIENCY SPLIT HEAT PUMP SYSTEM UP TO 20 SEER 10 HSPF Service Manual ...

Page 2: ...gnored When you see this symbol on labels or in manuals be alert to the potential for personal injury or death Electric shock hazard Can cause injury or death Before attempting to perform any service or maintenance turn the electrical power to unit OFF at disconnect switch es Unit may have multiple power supplies WARNING As with any mechanical equipment contact with sharp sheet metal edges can res...

Page 3: ...Max Over Current Device amps Compressor Outdoor Fan Motor Shipping Weight lbs Input Amps Full Load amps Rated HP Nom RPM NS18H36MA4 208 230 60 1 197 253 21 9 35 15 3 2 8 1 3 VAR SPD 215 NS18H60MA4 208 230 60 1 197 253 33 7 50 24 7 2 8 1 3 VAR SPD 272 Note Weights listed are unit weights with packaging Factory charged for 15 feet of line set adjust per installation instructions DIMENSIONS IN Model ...

Page 4: ...y HSPF 47 17 Btuh COP Btuh COP NS18H36MA4 NAM36V 19 0 12 0 34400 27200 9 6 33400 3 30 21400 2 40 1200 820 820 NS18H60MA4 NAM60V 16 0 10 0 55500 40600 9 0 55500 2 82 37000 2 14 1800 1200 1200 Note 1 DTC Designated tested combination 2 Certified in accordance with Unitary Air Conditioner Certification Program which is based on AHRI Standard 210 240 3 A blower time delay relay is standard on all GE A...

Page 5: ...rd Feature Protects compressor from short cycling Liquid Line Solenoid All models 60M52 Prevents liquid migration to the compressor especially for high liquid riser applications Additional System Accessories indoor section TXV Kit NS18H36MA4 2 Ton mode H4TXV01 TXVs provide superior refrigerant flow control comfort and efficiency NS18H36MA4 3 Ton mode NS18H60MA4 4 Ton mode H4TXV02 NS18H60MA4 5 Ton ...

Page 6: ...Page 6 31 5000751 Rev 0 Parts Arrangement Figure 1 Parts Arrangement Control Panel Outdoor Control Board Inverter Contactor Ground Lug Vent Low Voltage Grommet Low Voltage Connections Inverter Reactor ...

Page 7: ...t 3 Ton Check Valve Low Pressure Switch Suction Pressure Transducer Accumulator Compressor Muffler TXV High Pressure Switch Crankcase Heater Thermostat Liquid Service Valve Vapor Service Valve Liquid Pressure Transducer Suction Filter Reversing Valve ...

Page 8: ...tion Pressure Transducer Compressor Muffler TXV High Pressure Switch Liquid Service Valve Vapor Service Valve Liquid Pressure Transducer Reversing Valve Compressor Temperature Limit NOTE Crankcase Heater Thermostat located between Liquid Service Valve and Liquid Pressure Transducer ...

Page 9: ...codes Wear safety glasses and work gloves Use quenching cloth for brazing operations Have fire extinguisher available Read these instructions thoroughly and follow all warning or cautions attached to the unit 1 Always wear proper personal protection equipment 2 Always disconnect electrical power before removing panel or servicing equipment 3 Keep hands and clothing away from moving parts 4 Handle ...

Page 10: ... not to exceed 1 4 per foot Figure 4 Slab Mounting Install on a Solid Level Mounting Pad The outdoor section is to be installed on a solid foundation This foundation should extend a minimum of 2 inches beyond the sides of the outdoor section To reduce the possibility of noise transmission the foundation slab should NOT be in contact with or be an integral part of the building foundation See Figure...

Page 11: ...g can kink very easily and if this occurs the entire tube length will have to be replaced Extra care at this time will eliminate future service problems It is recommended that vertical suction risers not be up sized Proper oil return to the compressor should be maintained with suction gas velocity Filter Drier The filter drier is very important for proper system operation and reliability If the dr...

Page 12: ...ble 3 Between 51 and 150 Linear Feet Crankcase heater and nonbleed port TXV factory installed No additional components required Vertical vapor riser must be sized to the vapor riser listed in the Table 4 on systems with line sets longer than 51 feet Use Table 4 and Table 5 to determine the correct liquid and vapor line sizes Over 150 Linear Feet not recommended Additional oil is not required for s...

Page 13: ...NSING BULB LIQUID LINE ORIFICE HOUSING LIQUID LINE ASSEMBLY WITH BRASS NUT Figure 7 Remove Expansion Valve Uncased Coil Shown 1 On fully cased coils remove the coil access and plumbing panels 2 Remove any shipping clamps from the liquid line and distributor assembly 3 Disconnect the equalizer line from the fitting on the vapor line 4 Remove the vapor line sensing bulb Typical Existing Fixed Orific...

Page 14: ...ncluding line set and indoor coil must be an AHRI match with the unit in order to fulfill unit warranty requirements Fire Explosion and Personal Safety hazard Failure to follow this warning could result in damage personal injury or death Never use oxygen to pressurize or purge refrigeration lines Oxygen when exposed to a spark or open flame can cause fire and or an explosion that could result in p...

Page 15: ...nsulation is required if mounted external to the coil casing sensing bulb installation for bulb positioning STUB END TEFLON RING LIQUID LINE ASSEMBLY WITH BRASS NUT DISTRIBUTOR ASSEMBLY 3 Install one of the provided Teflon rings around the stubbed end of the check expansion valve and lightly lubricate the connector threads and expose surface of the Teflon ring with refrigerant oil 4 Attach the stu...

Page 16: ... Do not crimp end of the line Remove service cap and core from both the vapor and liquid line service ports 1 2 LIQUID LINE SERVICE VALVE SERVICE PORT CORE SERVICE PORT CAP SERVICE PORT CORE SERVICE PORT CAP CUT AND DEBUR LINE SET SIZE MATCHES SERVICE VALVE CONNECTION DO NOT CRIMP SERVICE VALVE CONNECTOR WHEN PIPE IS SMALLER THAN CONNECTION 3 VAPOR LINE SERVICE VALVE COPPER TUBE STUB REFRIGERANT L...

Page 17: ...OINT FLAME AWAY FROM SERVICE VALVE PREPARATION FOR NEXT STEP 7 WRAP SERVICE VALVES To help protect service valve seals during brazing wrap water saturated cloths around service valve bodies and copper tube stubs Use additionalwater saturated cloths underneath the valve body to protect the base paint 4 FLOW NITROGEN Flow regulated nitrogen at 1 to 2 psig through the refrigeration gauge set into the...

Page 18: ...he manifold gauge set in order to pressurize the line set and the indoor unit E After a few minutes open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak detector F After the line set has been connected to the indoor and outdoor units check the line set connections and indoor unit for leaks Use the following procedure to test for ...

Page 19: ...efrigerant Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and indoor unit G Perform the following Close manifold gauge valves Shut off HFC 410A cylinder Reinstall service valve cores by removing manifold hose from service valve Quickly install cores with core tool while maintaining a positive system pressure Replace stem caps and finger tighten them then t...

Page 20: ...formance data is based upon the use of a two stage thermostat Refer to the NS18HM field wiring diagram for a conventional 24VAC single stage thermostat NS18HM Low Voltage Control Wiring Connections The NS18HM variable capacity units are provided with 2 RAST 6 Pin connections for connecting the field low voltage control wiring to the NS18HM harnesses in the low voltage control make up box One RAST ...

Page 21: ...tat Control Options Install Thermostat Install room thermostat ordered separately on an inside wall approximately in the center of the conditioned area and 5 feet 1 5m from the floor It should not be installed on an outside wall or where it can be affected by sunlight or drafts THERMOSTAT 5 FEET 1 5M Figure 10 NOTE 24VAC Class II circuit connections are made in the control panel Size Circuit and I...

Page 22: ...00 30m 18 Temperature Rating 35 C Minimum More than 100 30m 16 Table 7 24VAC Thermostat Wiring Route High Voltage and Ground Wires Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring To facilitate a conduit a cutout is located on the bottom of the control box Connect conduit to the control box using a proper conduit fitting Connect the 208 230 ...

Page 23: ...R G TC TO ACC2 ACC1 Y1 O DH C W2 W1 R G DS W2 FOR SINGLE STAGE OPERATION INSTALL A JUMPER BETWEEN Y1 TO Y2 ON THE OUTDOOR UNIT TERMINAL STRIP Figure 12 Conventional 24VAC Heat Pump Thermostat Wiring Single Stage RAST 6 PIN CONNECTOR RAST 6 PIN CONNECTOR VARIABLE CAPACITY OUTDOOR UNIT TWO STAGE VARIABLE SPEED GAS FURNACE CONVENTIONAL 24VAC HEAT PUMP THERMOSTAT W L Y2 Y1 O DS C I I R DF TST Y1 O C W...

Page 24: ...tended capacity for the application is 3 or 5 Ton skip this section The units are field convertible to 2 Ton or 4 Ton to efficiently perform for the required application If the intended capacity is 2 or 4 Ton proceed to the following steps to program the unit type Outdoor unit must be powered ON and in idle mode no heating or cooling mode of operation NOTE The 36 unit can be programmed to operate ...

Page 25: ... Mode A heating blower demand must also be provided to initiate high speed blower operation on the indoor unit The compressor and outdoor fan motor will begin to ramp up and reach 100 design capacity within 3 minutes They will continue to operate at 100 design capacity for the duration of charge mode Exiting Charge Mode To exit the charging mode remove the Charge Mode Jumper from the Charge Mode P...

Page 26: ...varying the compressor capacity to obtain the target suction pressure set point If the heating or cooling demand remains after 20 minutes the NS18HM control will begin to ramp up the compressor capacity until maximum capacity is achieved The NS18HM unit will cycle off once the thermostat demand is satisfied Defrost Function The outdoor unit control uses a time dependent frost accumulation duration...

Page 27: ...ll be decreased by 30 minutes If the defrost accumulation time is significantly longer 200 or more of the target defrost cycle time or if the defrost terminates at the 14 minute maximum time the frost accumulation time is set to 30 minutes No change is he frost accumulation time is made if the frost accumulation time is close to the target defrost cycle time between 80 and 120 of the target defros...

Page 28: ...10 97 duty cycle 19 23 VDC peak C PWM fan common connection N A N A Fan PWM common P10 PSC Fan 1 4ʺ QC 1 4ʺ QC terminals Switched output for PSC outdoor fan control not used on NS18HM heat pumps N A Switched 230VAC Nominal N A RAST Connector Terminal Designations W 24VAC Output for defrost auxiliary heat output N A 24VAC nominal N A L 24VAC input to initiate load shed 24VAC nominal from load shed ...

Page 29: ...rature sensor not used 10K ohm resistor installed N A N A N A CHRG MODE Charge Mode function Can be used when charging checking charge pump down or checking unit operation Unit will run at 100 capacity Conventional 24VAC heat pump thermostat Cooling mode 1 Provide a Y1 compressor demand and a O Reversing Valve signal to the NS18HM 2 Install the Charge Mode jumper after the Y1 demand 3 A blower dem...

Page 30: ...ice valves to release the refrigerant charge contained in outdoor unit into the system 4 Replace the stem caps and tighten 5 Check voltage supply at the disconnect switch The voltage must be within the range listed on the unit s nameplate If not do not start the equipment until you have consulted with the power company and the voltage condition has been corrected 6 Set the thermostat for a cooling...

Page 31: ...e Red LED Green LED N A N A ON OFF N A NS18HM36 only Indicates inverter is operating normally N A N A ON ON N A NS18HM60 only Indicates inverter is operating normally N A N A OFF OFF N A Indicates inverter is NOT energized 125 Service Urgent Control Hardware Problem There is a hardware problem on a system component control There is a control hardware problem Replace the control if the problem prev...

Page 32: ...inues for 10 minutes the thermostat will turn off the applicable system component Automatically clears after voltage is detected as higher than 20VAC for two seconds or after power reset 410 Information Only Dealer OD Open Low Pressure Switch Unit low pressure is below the required limit Check operating pressures Low pressure switch opens at a specific pressure system shuts down and closes at a sp...

Page 33: ...cooling Automatically clears when error is corrected 423 40 4 flashes OFF Service Soon Service Urgent OD Inverter CT Circuit Fault The inverter has detected a circuit issue When this condition is detected the outdoor control will stop outdoor unit operations and start the anti short cycle timer moderate condition Outdoor control will lockout unit after 10 strikes within an hour critical condition ...

Page 34: ...ter with updated software that includes compressor current slope logic to reduce the potential of alert code 427 instances from occurring during defrost Replace the inverter with the latest inverter if necessary Refer to the unit service documentation for detailed troubleshooting procedures NOTE Serial number format on unit name plate is PPYYMNNNNN PP Manufacturing Plant YY and M represents the ye...

Page 35: ...es NOTE Inverter normal operations with no error code present is as follows Red LED is ON and Green LED is OFF Troubleshooting Suggestions Check wire connections U V and W at inverter plug in harness and compressor Check the resistance of compressor windings If not in range replace compressor Check compressor to ground If ground issue replace compressor Check input power Single Phase 208 230VAC 10...

Page 36: ...Inverter DC Link High Voltage The inverter has detected a DC link high voltage condition Error occurs when the DC link capacitor voltage is greater than 480 VDC If condition is detected outdoor unit will stop compressor and fan moderate condition Anti short cycle timer is initiated If condition occurs 10 times within 60 consecutive minutes the system will lockout critical condition Inverter LEDs w...

Page 37: ...itical condition This alert code may be triggered by the inverter or the GE Appliances variable capacity outdoor inverter controlled unit GE Appliances outdoor control may trigger an this alert code if the inverter reduces the compressor speed which is identified as a alert code 441 and the compressor speed in hz is below the minimum speed This will typically occur at start up The inverter automat...

Page 38: ...alert code 434 reset the system by cycling the outdoor unit power off and back on Then cycle the indoor power off 24VAC to the GE Appliances outdoor control and then back on If this condition continuously occurs during a one hour period and during a single thermostat call the outdoor unit will lock out and display alert code 434 critical condition Troubleshooting Options Check for loose or disconn...

Page 39: ...res Inverter flash code 62 The sequence is Red LED Six Flashes Green LED Two Flashes NOTE Inverter normal operations with no error code present is as follows Red LED is ON and Green LED is OFF Moderate condition will automatically clear when the inverter sends an alert code clear message Critical condition is cleared by disconnecting power to the outdoor unit and restart 437 65 6 flashes 5 flashes...

Page 40: ...he error moderate condition After three minutes the inverter will reset and the compressor will resume operation If the error condition occurs 10 times within a 60 minute rolling time period the outdoor unit control will lock out operation of the outdoor unit critical condition Possible issue is system running at high pressures Check for high pressure trips or other alert codes in thermostat and o...

Page 41: ... period of time and to reduce the heat sink temperature and will then resume normal operation This may occur at high outdoor temperatures above 110ºF for brief periods of time 3 4 minutes and is normal and expected operation of the inverter controlling the compressor safely within design parameters The inverter finned aluminum heat sink is located on the back side of the inverter in the condenser ...

Page 42: ...ce is Red LED One Flash Green LED Four Flashes NOTE Inverter normal operations with no error code present is as follows Red LED is ON and green LED is OFF Automatically clears when the condition no longer exists 442 Service Urgent OD Compressor Top Cap Switch Strikes Lockout The top cap switch has opened five times within one hour As a result the outdoor unit is locked out This condition occurs wh...

Page 43: ...r two characters If the unit code cannot be determined three bars appear THROUGH OR These are just examples of firmware version unit type unit nominal capacity and unit codes UNIT CODE UNIT TYPE SIZE AND MODEL NOT PROGRAMMED 2 TON HP mode 3 TON HP mode 4 TON HP mode 5 TON HP mode UNIT NOMINAL CAPACITY The next item to be displayed is the self discovery unit nominal capacity Valid capacities are 24...

Page 44: ...lowing string flashes every 0 5 seconds 0 0 0 0 pause Active error in outdoor control Idle mode Show all active error s codes Following display string is repeated if Error E 125 and E 201 are present E 1 2 5 pause E 2 0 1 Active error in run mode Show current status and all active error s codes Following display string is repeated if Error E 440 is present while cooling demand is 80 percent C 8 0 ...

Page 45: ...display Release button outdoor fan cycles OFF A A in the display string represents the ambient temperature in F at the sensor on the outdoor unit Control can be in Idle or demand mode To enter display configuration option A mode push and hold button until solid appears release button Display begins flashing Within 10 seconds push and hold button until required symbol A displays release button Disp...

Page 46: ...he display string must be repeated Yes No NOTE Either the sequence will repeat 5 times and if a selection is not made the control will return to idle mode NOT SELECTED SELECTED Configuring Unit Selection Code Power up Unit selection code two digit number displayed represents unit size code outdoor unit capacity During initial power up firmware version unit type unit capacity and unit selection cod...

Page 47: ...the air Clogged condenser coils will lower the efficiency of your unit and could cause damage to the condenser Periodically debris should be brushed from the condenser coils Use a soft bristle brush with light pressure only DO NOT damage or bend condenser coil fins Damaged or bent fins may affect unit operation Figure 19 Removing Louvers Remove two screws at top panel to remove louvers for coil ac...

Page 48: ...y The ON or CONT mode provides continuous indoor blower operation regardless of whether the compressor or auxiliary heat are operating This mode is required when constant air circulation or filtering is desired On models without a fan selection switch the fan will cycle with the outdoor unit System Switch Set the system switch for heating cooling or auto operation The auto mode allows the heat pum...

Page 49: ...Page 49 31 5000751 Rev 0 Figure 20 Wiring Diagram Wiring Diagram ...

Page 50: ...oor Control 1 Sends a demand to the compressor inverter to start and run the compressor up to the requested pumping capacity Frequency in hertz 2 On NS18H units output signal is provided on PWM and COM terminals to start and run the ECM outdoor fan at the demand RPM 3 Sends a communication signal into the indoor unit to start and run the supply fan motor at the demand air volume CFM On 24 VAC powe...

Page 51: ...ITCH IS CLOSED OR 3 5 STRIKE COUNTER REACHES 5 WITHIN A SINGLE Y1 DEMAND LOW PRESSURE LOCKOUT LED ALERT CODE OR CRITICAL ALERT 411 DISPLAYED SERVICE REQUIRED2 LED ALERT CODE OR MODERATE ALERT 410 DISPLAYED SERVICE REQUIRED2 NORMAL OPERATION CLOSED CLOSED OPEN OPEN OPEN CLOSED CLOSED 1 The thermostat terminates demand when the contactor is de energized If demand is satisfied when alarm is not activ...

Page 52: ...THIN A SINGLE Y1 DEMAND HIGH PRESSURE SWITCH S4 LOCKOUT LED ALERT CODE OR CRITICAL ALERT 413 CLEARED SERVICE REQUIRED2 LED ALERT CODE OR MODERATE ALERT 412 DISPLAYED NORMAL OPERATION CLOSED CLOSED OPEN OPEN OPEN CLOSED CLOSED TOP CAP SWITCH S173 CLOSED SERVICE REQUIRED2 1 The thermostat terminates demand when the contactor is de energized If demand is satisfied when alarm is not active the 5 strik...

Page 53: ...ROST ACCUMULATION TIME INCREASED BY 30 MIN DEFROST CYCLE WILL RUN AND THE TIME IS COMPARED TO TARGET DEFROST CYCLE TIME 120S 125S 130S 135S DEFROST CYCLE TIME WILL BE MEASURED UNTIL COIL TEMP REACHES 50 F DEFROST WILL TERMINATE WHEN COIL TEMP REACHES TERMINATION TEMP RETURN TO HP HEATING AND RESET RUN TIMER IF DEFROST CYCLE TIME IS LONG 120 OR MORE OF TARGET DEFROST CYCLE TIME FROST ACCUMULATION T...

Page 54: ...on Checkout Status Error Codes 72 Verifying High Pressure Switch and Low Pressure Protection Operation OPERATION The unit s pressure switches HPS S4 and LPS S87 are wired into the the control HPS and LPS terminals respectively Low Suction Pressure Switch LPS See Figure 25 for low suction pressure protection sequence of operation High Pressure Switch HPS See Figure 25 for high pressure switch seque...

Page 55: ...r to Pin 3 Black GND should read 0 5 to 4 5 VDC and will vary depending on suction pressure measured See Table 16 VDC Figure 26 Suction Pressure Transducer Voltage Suction Pressure PSIG DC Voltage Output Pin 2 to Pin 3 Suction Pressure PSIG DC Voltage Output Pin 2 to Pin 3 0 0 49 110 2 69 10 0 69 120 2 89 20 0 89 130 3 09 30 1 09 140 3 29 40 1 29 150 3 49 50 1 49 160 3 69 60 1 69 170 3 89 70 1 89 ...

Page 56: ...quid Pressure Transducer Voltage Liquid Pressure PSIG DC Voltage Output Pin 2 to Pin 3 Liquid Pressure PSIG DC Voltage Output Pin 2 to Pin 3 0 0 50 260 2 58 10 0 58 270 2 66 20 0 66 280 2 74 30 0 74 290 2 82 40 0 82 300 2 90 50 0 90 310 2 98 60 0 98 320 3 06 70 1 06 330 3 14 80 1 14 340 3 22 90 1 22 350 3 30 100 1 30 360 3 38 110 1 38 370 3 46 120 1 46 380 3 54 130 1 54 390 3 62 140 1 62 400 3 70 ...

Page 57: ...Strikes Lockout The high pressure switch has opened five times during one cooling demand Thermostat will shut down the outdoor unit Open high pressure switch error count reached five strikes Check system charge using superheat and sub cooling temperatures Check outdoor fan operation Check for dirt or debris blocking air flow to outdoor unit Reset by putting outdoor unit control in test mode or res...

Page 58: ...ssor through the top of the unit Removal through the access panel is not possible ELECTRICAL CONNECTION PLUG LOCATION NOT SHOWN DISCHARGE SUCTION EQUALIZATION VALVE NS18H ROTARY COMPRESSOR COMPRESSOR ACCUMULATOR TOP CAP THERMOSTAT S173 ROTARY COMPRESSION CHAMBER COMPRESSOR MOTOR CUTAWAY OF TYPICAL ROTARY COMPRESSOR NOT ACTUAL NS18H COMPRESSOR Figure 29 NS18HM Rotary Compressor Detail Models NS18HM...

Page 59: ...oaded The 240 VAC solenoid coil is controlled by the inverter The solenoid coil is powered when the compressor is off to equalize the pressure and is de energized when the compressor is operating STATUS CODES When the compressor is running the 7 segment display will show the compressor capacity When the NS18HM unit is installed with a conventional 24VAC thermostat the display will show C 1 or C 2 ...

Page 60: ...ccurs when compressor peak phase current is greater than 28 amps Inverter will issue inverter code 14 first and slow down to try to reduce the current If the current remains high outdoor unit will stop compressor and fan moderate condition Cycle timer is initiated If condition occurs five times within 60 consecutive minutes the system will lockout critical condition This alert code may be triggere...

Page 61: ...ime and to reduce the heat sink temperature and will then resume normal operation This may occur at high outdoor temperatures above 110ºF for brief periods of time 3 4 minutes and is normal and expected operation of the inverter controlling the compressor safely within design parameters The inverter finned aluminum heat sink is located on the back side of the inverter in the condenser air stream I...

Page 62: ...nd slow the compressor ramp up speed to the requested compressor demand speed capacity This is normal and expected operation of the inverter to control the inverter within design parameters In most cases the alert code 441 notification does not require any additional service or diagnostic procedures The control sets indoor CFM and outdoor RPM to values according to demand percentage rather than th...

Page 63: ... the thermostat opens which results in the heater being de energized Figure 31 Belly Band Crankcase Heater Thermostat Belly Band Crankcase Heater 240VAC 40 Watts Crankcase Heater Thermostat CHECKOUT Belly Band Crankcase Heater Using meter set on ohms check crankcase heater resistance If resistance is 0 ohms or infinite replace the crankcase heater Figure 32 Checking Belly Band Crankcase Heater Cra...

Page 64: ...ier Rotary Compressor Models Only The NS18HM36 units have a rotary compressor and have a factory installed suction line filter drier installed in the suction line Liquid drier is not required but may be field installed The filter drier is designed to remove moisture and foreign matter which can lead to compressor failure Figure 35 Suction Line Filter Drier Liquid Line Filter Drier NS18HM60 Scroll ...

Page 65: ...casing This switch senses the compressor casing temperature and opens at 239 257 F to shut off compressor operation The auto reset switch closes when the compressor casing temperature falls to 151 187 F and the compressor is re energized This is a single pole single throw SPST bi metallic switch TOP OF COMPRESS0R SWITCH COVER COMPRESSOR TOP CAP SWITCH SPST BI METALIC SWITCH NORMALLY OPENS AT 239 2...

Page 66: ...utomatically clears when error is corrected 442 Service Urgent OD Compressor Top Cap Switch Strikes Lockout The top cap switch has opened five times within one hour As a result the outdoor unit is locked out This condition occurs when compressor thermal protection sensor opens five times within one hour Outdoor unit will stop To clear discon nect power to outdoor unit and restart Table 20 Outdoor ...

Page 67: ...e outdoor fan will cycle off Units with ECM Motor 1 With the unit running check for 230VAC at the red outdoor fan motor wires at the contactor If no voltage is present check main power at the contactor 2 Perform a DC voltage check between the FPWM and Fan C terminal 3 Using the push button on the control enter the fan test mode in the field test mode by pushing and holding the button until solid a...

Page 68: ...thermostat GF Gas Furnace AH Air Handler ID Indoor unit GF or AH HP Heat Pump AC Air Conditioner OD Outdoor Unit AC or HP ZA Zone system and TS Thermostat Alert Code Inverter Flash Code Priority Condition Actual Displayed Alert Text Component or System Operational State and Troubleshooting Tip How to Clear Alert Code 125 Service Urgent Control Hardware Problem There is a hardware problem on a syst...

Page 69: ...182 error code if the sensor reads open or shorted for 24 hours Cooling operation is allowed with this fault Liquid Line Temperature Sensor RT36 Liquid line temperature is read by the liquid line temperature sensor between Pins 3 and Pin 4 of the 4 pin sensor harness Nominal Resistance of the sensor is 10K ohms at 77F The control will display are E184 error code if the sensor reads open or shorted...

Page 70: ...ot within the range shown in figure 49 may be performing as designed However if a shorted or open circuit is detected then the sensor may be faulty and the sensor harness will need to be replaced OUTDOOR AMBIENT TEMPERATURE SENSOR CRANKCASE HEATER THERMOSTAT S40 OPENS AT 70ºF CLOSES AT 50ºF Figure 43 Temperature Sensor Locations ...

Page 71: ...63752 27 8 217080 89 4 7444 41 1 25349 8 8 64812 28 7 223677 88 1 7666 40 5 25769 8 3 65895 29 5 230621 86 9 7890 39 9 26195 7 7 67000 30 4 237941 85 7 8115 39 3 26626 7 2 68128 31 3 245667 84 5 8343 38 7 27063 6 7 69281 32 2 253834 83 4 8573 38 1 27505 6 1 70458 33 2 262482 82 3 8806 37 5 27954 5 6 71661 34 1 271655 81 2 9040 37 0 28408 5 0 72890 35 1 281400 80 1 9277 36 4 28868 4 5 74147 36 1 29...

Page 72: ...the outdoor sensor in the outdoor unit or the optional outdoor sensor connected to the indoor unit In normal operation after system component control recognizes sensors the alert code will be sent if valid temperature reading is lost Compare outdoor sensor resistance to temperature resistance charts in unit installation instructions Replace sensor pack or stand alone outdoor sensor At the beginnin...

Page 73: ...ll flash codes 12 to 14 and 53 NOTE These inverter codes do not count towards this lockout condition To clear disconnect power to outdoor control and restart 427 21 2 flashes 1 flash Service Soon Service Urgent OD Inverter DC Peak Fault The inverter has detected a DC peak fault condition If condition 55A or higher is detected outdoor unit will stop compressor and fan moderate condition Anti short ...

Page 74: ...rate code If condition is detected outdoor unit will stop compressor and fan moderate condition An anti short cycle timer is initiated If condition occurs 10 times within a 60 consecutive minutes system will lock out and display alert code 429 critical condition The outdoor control anti short cycle timer will time out and the unit will recycle the demand Inverter LEDs will flash code 23 Refer to t...

Page 75: ...TE Inverter normal operations with no error code present is as follows Red LED is ON and Green LED is OFF Check refrigerant Replace outdoor control board Replace inverter To clear disconnect power to outdoor unit and restart 431 27 2 flashes 7 flashes Service Soon Service Urgent OD Inverter PFC Fault The inverter has detected a PFC circuit over current condition Error occurs when PFC detects an ov...

Page 76: ... Refer to the unit service documentation for detailed troubleshooting procedures Inverter flash code 28 The sequence is Red LED Two Flashes Green LED Eight Flashes NOTE Inverter normal operations with no error code present is as follows Red LED is ON and Green LED is OFF Troubleshooting Suggestions Check wire connections U V and W at inverter plug in harness and compressor Check the resistance of ...

Page 77: ...y be triggered by the inverter or the GE Appliances variable capacity outdoor inverter controlled unit GE Appliances outdoor control may trigger an this alert code if the inverter reduces the compressor speed which is identified as a alert code 441 and the compressor speed in hz is below the minimum speed This will typically occur at start up The inverter automatically increases the compressor min...

Page 78: ...he system by cycling the outdoor unit power off and back on Then cycle the indoor power off 24VAC to the GE Appliances outdoor control and then back on If this condition continuously occurs during a one hour period and during a single thermostat call the outdoor unit will lock out and display alert code 434 critical condition Troubleshooting Options Check for loose or disconnected electrical conne...

Page 79: ...de 62 The sequence is Red LED Six Flashes Green LED Two Flashes NOTE Inverter normal operations with no error code present is as follows Red LED is ON and Green LED is OFF Moderate condition will automatically clear when the inverter sends an alert code clear message Critical condition is cleared by disconnecting power to the outdoor unit and restart 437 65 6 flashes 5 flashes Service Soon Service...

Page 80: ...dition After three minutes the inverter will reset and the compressor will resume operation If the error condition occurs 10 times within a 60 minute rolling time period the outdoor unit control will lock out operation of the outdoor unit critical condition Possible issue is system running at high pressures Check for high pressure trips or other alert codes in thermostat and outdoor control Invert...

Page 81: ...o reduce the heat sink temperature and will then resume normal operation This may occur at high outdoor temperatures above 110ºF for brief periods of time 3 4 minutes and is normal and expected operation of the inverter controlling the compressor safely within design parameters The inverter finned aluminum heat sink is located on the back side of the inverter in the condenser air stream If the ale...

Page 82: ...hin design parameters Alert code 441 typically occurs at startup as the compressor current increases rapidly during startup The inverter will reduce the compressor speed by 4 Hz and slow the compressor ramp up speed to the requested compressor demand speed capacity This is normal and expected operation of the inverter to control the inverter within design parameters In most cases the alert code 44...

Page 83: ...es If weighing facilities are not available use the Subcooling method Charge Using the Subcooling Method Cooling Mode When the outdoor ambient temperature is 60ºF 15ºC and above use the cooling mode to adjust the charge using the subcooling method Target subcooling values in table 2 are based on 70 80ºF 21 27ºC indoor return air temperature Heating Mode When the outdoor ambient temperature is belo...

Page 84: ...m 3 Weigh in the unit nameplate charge adjusting for matchup and line set length differences If weighing facilities are not available use the Subcooling method Charge Using the Subcooling Method Cooling Mode When the outdoor ambient temperature is 60ºF 15ºC and above use the cooling mode to adjust the charge using the subcooling method Target subcooling values in table 2 are based on 70 80ºF 21 27...

Page 85: ...Page 85 31 5000751 Rev 0 Notes ...

Page 86: ...Printed in the U S A All specifications and illustrations subject to change without notice and without incurring obligations ...

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