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Page 17 of 21

507919-01

Issue 1946

Control 

Locations

Control Label 

or Description Purpose

Function

P1

50, 70, 90, 100

Defrost Temperature 

Termination Shunt 

(Jumper) Pins

The control board has selections which are: 50, 70, 90, and 100°F 

(10, 21, 32 and 38°C). The shunt termination pin is factory-set at 50°F 

(10°C). If the temperature shunt is not installed, the default termination 

temperature is 90°F (32°C).

P2

W

24VAC Thermostat Input 

/ Output

24VAC input / output from indoor thermostat to indoor unit.

C

24VAC Common

24VAC common.

L

Thermostat Service Light

Thermostat service light connection.

R

24VAC

24VAC.

Y2

Thermostat Input

Controls the second stage operation of the unit.

O

Thermostat Input

Reversing valve solenoid.

Y1

Thermostat Input

Controls the operation of the unit.

P3

55, 50, 45, 40

Low Ambient Thermostat 

Pins

Provides selection of the Y2 compressor lock-in temperature. Valid 

options are 40, 45, 50 and 55 degrees Fahrenheit.

P4

DIS-YEL

Coil Sensor

(P4-5) Ground connection for outdoor coil temperature sensor.
(P4-6) Connection for outdoor coil temperature sensor.

AMB-BLACK

Ambient Sensor

(P4-3) Ground connection for outdoor ambient temperature sensor.
(P4-4) Connection for outdoor ambient temperature sensor.

P5

DELAY

Delay Mode

The control board has a field-selectable function to reduce occasional 

sounds that may occur while the unit is cycling in and out of the defrost 

mode. When a jumper is installed on the DELAY pins, the compressor will 

be cycled off for 30 seconds going in and out of the defrost mode. Units 

are shipped with jumper installed on DELAY pins.

NOTE - The 30-second off cycle is NOT functional when TEST pins on 

P1 are jumpered.

P6

TST, PS DF, C, 

R, O, Y1, Y2

Factory Test Connectors

No field use.

DS1

RED LED

Diagnostic LED

Control board LEDs may be OFF, ON, or FLASHING to indicate 

diagnostic conditions which are described in Table 6.

DS2

GREEN LED

FAN

TWO 

CONNECTORS Condenser Fan Operation These two connections provide power for the condenser fan.

O OUT

O OUT

24 VAC output

24 VAC output connection for reversing valve.

LO-PS

LO-PS

Low-Pressure Switch

When the low pressure switch trips, the control board will cycle off the 

compressor, and the strike counter in the control board will count one 

strike. The low pressure switch is ignored under the following conditions: 
•  during the defrost cycle and 90 seconds after the termination of defrost
•  when the average ambient sensor temperature is below 0°F (-18°C)
•  during 90 seconds following the start of the compressor during TEST 

mode.

Y2 OUT

Y2 OUT

24 VAC Output

24 VAC output for second-stage compressor solenoid.

Y1 OUT

Y1 OUT

24 VAC Common Output

24 VAC common output, switched for enabling compressor contactor.

HS-PS

HS-PS

High-Pressure Switch

When the high pressure switch trips, the control board will cycle off the 

compressor, and the strike counter in the control board will count one 

strike.

L

L

Service Light Output

24VAC service light output.

Table 7. 

Control Board Inputs, Outputs and Configurable Settings

Summary of Contents for 4HP16

Page 1: ...ed thoroughly after cleaning In coastal areas the coil should be cleaned with potable water several times per year to avoid corrosive buildup salt NOTICE 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 Installation and se...

Page 2: ...nstalled 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 General Read this entire instruction manual as well as the instructions supplied in separate equipment before starting the installation Observe and follow all warnings cautions instructional labels and tags Fa...

Page 3: ...48 Between units 24 Against wall 6 Maximum soffit overhang is 36 NOTE At least one side should be unobstructed by a wall or other barrier Table 2 Clearances 30 around Control Box 24 6 NOTE See Table 2 for specific minimum clearance guidelines Figure 2 DO LOCATE THE UNIT With proper clearances on sides and top of unit On a solid level foundation or pad unit must be level to within 1 4 in ft per com...

Page 4: ... 8 042 3 8 3 8 7 8 7 8 048 3 8 3 8 7 8 7 8 060 3 8 3 8 7 8 1 1 8 Field supplied 7 8 x 1 1 8 connector required on both ends of vapor tubing Table 3 Recommended Liquid Vapor Tube Diameters in Be extra careful with sharp bends Tubing 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...

Page 5: ... UNIT VAPOR LINE SERVICE VALVE VAPOR LIQUID 1 A B C D A Cylinder with clean R 410A positioned to deliver liquid refrigerant to the vapor service valve B Refrigerant gauge set low side to the liquid line valve C Refrigerant gauge set center port to inlet on the recovery machine with an empty recovery tank connected to the gauge set D Connect recovery tank to recovery machine per machine instruction...

Page 6: ...oil Shown Sensing bulb insulation 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 refriger...

Page 7: ...round 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 REFRIGER...

Page 8: ...VES POINT 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 int...

Page 9: ... of the 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...

Page 10: ...uid refrigerant 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 t...

Page 11: ... breaker may result in property damage Size wiring and circuit breaker s per Product Specifications and unit rating plate WARNING ELECTROSTATIC DISCHARGE ESD Precautions and Procedures Electrostaticdischargecanaffectelectroniccomponents Take care during unit installation and service to protect the unit s electronic controls Precautions will help to avoid control exposure to electrostatic discharge...

Page 12: ...example of control wiring connections when using a standard thermostat 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 in the bottom of the control panel Connect conduit to the control panel using a proper conduit fitting ROUTING HIGH VOLTAGE GROUND AND CONTROL WIRING WIRE RUN LENGTH AWG INSULATIO...

Page 13: ...ure auto reset trip at 25 psig reset at 40 5 Add refrigerant if subcooling is lower than table Recover refrigerant if subcooling is high 6 If ambient temp is lower than 60 F check charge in heating mode or weigh refrigerant according to name plate data Heating Mode Check charge in heating mode if ambient temp is below 60 F Indoor temp must be between 65 and 75 F Follow steps 1 to 6 above and compa...

Page 14: ...ult code Heating and cooling operation will be allowed in this fault condition NOTE The coil temperature probe is designed with a spring clip to allow mounting to the outside coil tubing Coil sensor location is important for proper defrost operation Ambient Sensor The ambient sensor considers outdoor temperatures below 35 F 37 C or above 120 F 48 C as a fault If the ambient sensor is detected as b...

Page 15: ... F 2 C the control board will initiate a defrost cycle Actuation When the reversing valve is de energized the Y1 circuit is energized and the coil temperature is below 35 F 2 C the board logs the compressor run time If the board is not calibrated a defrost cycle will be initiated after 30 minutes of heating mode compressor run time The control will attempt to self calibrate after this and all othe...

Page 16: ...not perform demand or time temperature defrost operation System will still heat or cool ON ON Fault Demand Defrost Control Failure Indicates that demand defrost control has internal component failure Cycle 24VAC power to control board If code does not clear replace control board OFF SLOW Flash Fault Low Pressure Fault Restricted air flow over indoor or outdoor coil Improper refrigerant charge in s...

Page 17: ...r is installed on the DELAY pins the compressor will be cycled off for 30 seconds going in and out of the defrost mode Units are shipped with jumper installed on DELAY pins NOTE The 30 second off cycle is NOT functional when TEST pins on P1 are jumpered P6 TST PS DF C R O Y1 Y2 Factory Test Connectors No field use DS1 RED LED Diagnostic LED Control board LEDs may be OFF ON or FLASHING to indicate ...

Page 18: ...bent fins may affect unit operation SHARP OBJECT HAZARD Condenser coils have sharp edges Wear adequate body protection on body extremities e g gloves FAILURE TO FOLLOW THIS WARNING COULD RESULT IN BODILY INJURY WARNING Painted Surfaces For maximum protection of the unit s finish a good grade of automobile wax should be applied every year In geographical areas where water has a high concentration o...

Page 19: ...the defrost cycle In case of extended power outage If the outdoor temperature is below 50 F and power to your outdoor unit has been interrupted for one hour or longer observe the following when restoring power to your heat pump system Set the room thermostat selector to the Emergency Heat setting to obtain temporary heat for a minimum of 6 hours This will allow system refrigerant pressures and tem...

Page 20: ...507919 01 Page 20 of 21 Issue 1946 Figure 7 Wiring Diagram 018 030 Models Y2 IS NOT USED WITH SINGLE STAGE UNITS 5 5 ...

Page 21: ...Page 21 of 21 507919 01 Issue 1946 Figure 8 Wiring Diagram 036 060 Models 5 Y2 IS NOT USED WITH SINGLE STAGE UNITS 5 ...

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