Service Manual

TECHNICAL SUPPORT MANUAL Split System Heat Pump: (H,C,T)CH(6)
428 04 170100 7
UNIT OPERATION
Short flashes indicate the first digit in the status code, followed by long flashes indicating the second digit of the status code.
FAULT DEFINITION FLASH CODE
FAULT DEFINITION
FLASH CODE
On, No Flash
1, Pause
2, Pause
Continuous Flash
16
25
31
32
45
46
47
Standby
Low Stage
High Stage
Emergency Mode
System Communications Failure
Invalid Model Plug
High Pressure Switch Trip
Low Pressure Switch Trip
Control Fault
Brown out (230V)
No 230v with Call to Run
53
55
56
71
72
73
74
81
82
83
84
Outdoor Air Temp Sensor
Coil Temp Sensor
Temp Sensor Range Error
Low Stage Thermal Cutout
High Stage Thermal Cutout
Contactor Shorted
Contactor Open (No 230v to Comp)
Low Stage Thermal Lockout (4 HRS)
High Stage Thermal Lockout (4 HRS)
Low Pressure Lockout (4 HRS)
High Pressure Lockout (4 HRS)
Time Delays
The unit time delays include:
--Five minute time delay to start cooling operation when there is a call from the thermostat or wall
Control. To bypass this feature, momentarily short and release Forced Defrost pins or hold the
“Cool To” or “Heat To” button on the Observer Wall Control for 10 seconds.
--Five minute compressor re --cycle delay on return from a brown--out condition.
--Two minute time delay to return to standby operation from last valid communica
tion (Observer Communicating Wall Control only).
--One minute time delay of outdoor fan at termination of cooling mode when outdoor
ambient is greater than or equal to 100° F (37.8° C).
--Fifteen second delay at termination of defrost before the auxiliary heat (W1) is de--
energized.
--Twenty second delay at termination of defrost before the outdoor fan is energized.
--Thirty second compressor delay and 40 seconds outdoor fan delay when quiet
shift enabled.
Crankcase Heater
--The crankcase heater is de--energized when the compressor is running. The crankcase heater is ene
gized when the compressor is off and the ambient is less than 42° F. When the ambient temperature is
between 65° F and 42° F the crankcase heater is energized 30 minutes after the compressor
Is turned off. When the ambient is above 65° F the crankcase heater remains de--energized after the
compressor is turned off.
This control offers 5 possible defrost interval times: 30, 60, 90, 120 minutes, or AUTO. Defrost intervals
are selected by dip switches on the unit control board or by the Observer Wall Control. The Observer
Wall Control selection overrides the control board dip switch settings.
AUTO defrost adjusts the defrost interval time based on the last defrost time as follows:
When defrost time <3 minutes, the next defrost interval =120 minutes.
When defrost time 3 --5 minutes, the next defrost interval =90 minutes.
When defrost time 5 --7 minutes, the next defrost interval =60 minutes.
When defrost time >7 minutes, the next defrost interval =30 minutes.
Defrost time selection