Configuration - Carrier PC 111 Operating And Troubleshooting Manual

DISPLAY DESCRIPTION OF FAILURE
51 Compressor 1 failure
55 Compressor 2 failure
Compressor 3 failure
52
Compressor 4 failure
56
59 Loss-of-charge circuit 1
60 Loss-of-charge circuit 2
63 Low oil pressure circuit 1
64 Low oil pressure circuit 2
70 Illegal unit configuration
71 Supply-air thermistor failure
72 Return-air thermistor failure
75 Circuit 1 saturated condensing thermistor
76 Circuit 2 saturated condensing thermistor
81 Reset temperature thermistor failure
82 Supply-air set point potentiometer failure
83 Economizer potentiometer failure
84 Reset limit set point potentiometer failure
85 Demand limit potentiometer failure
86 Minimum economizer potentiometer failure
87 Warm-up set point potentiometer failure
NOTES:
1. Illegal unit configuration caused by missing programmable header or both unloader DIP switches on.
2. All auto. reset failures that cause the unit to stop will restart when the error has been corrected.
3. All manual reset errors must be reset by turning the control switch off and then back on.
4. Valid resistance range for the thermistors is 363,000 to 585 ohms.
5. Codes 53, 54, 57, 58, 61, 62, 65-69, 73, 74, and 77-80 are not used on these units.
CODES 59 AND 60: LOW-PRESSURE SWITCH — These
codes are used to indicate a low-pressure switch failure.
The processor monitors the low-pressure switch. If the
switch opens, either by low refrigerant charge, circuit failure,
or wiring error, the circuit is locked off. Code 59 indicates a
failure of the lead circuit, and as a result, that circuit will be
shut down. Code 60 indicates a failure of the lag circuit, and as
a result, that circuit will be shut down. These codes will only be
displayed when the display button is pressed. To reset the cir-
cuit, the ON-OFF switch must be turned to OFF, then ON
position.
CODES 63 AND 64: OIL PRESSURE SWITCH — These
codes are used to indicate an oil pressure switch failure. Since
the units do not have oil pressure switches, these codes are not
used. The terminals on the processor board must be jumpered
together or an error will occur. If these errors occur, check
jumper between J2-1 and J2-2 for a code 63, or between J2-3
and J2-4 for a code 64 to be sure jumper is properly connected.
To reset the circuit, the ON-OFF switch must be turned to OFF
and then to ON position.
CODE 70: ILLEGAL UNIT CONFIGURATION — If the
unit configuration header is not installed and properly config-
ured, and/or if DIP switches are not properly set, unit will not
start, and an error code of 70 will be indicated on display board
when display button is pushed. Check the header and DIP
switch settings.
CODES 71 TO 76: THERMISTOR/RESISTOR FAILURE —
If measured temperature of a thermistor is less than –60 F
(363,000 ohms) or greater than 180 F (585 ohms), the appro-
priate sensor error code (Table 23) will be displayed when
the display button is pushed. The unit will be shut down.
Thermistor failures will automatically reset once the error has
Table 23 — Diagnostic Codes
ACTION TAKEN
BY CONTROL
Circuit 1 shut off
Circuit 2 shut off
Compressor 3 shut off
Compressor 4 shut off
Circuit 1 shut off
Circuit 2 shut off
Circuit 1 shut off
Circuit 2 shut off
Unit will not start
Unit shut off
Use default value
Unit shut off
Unit shut off
Stop reset
Use default value
Close economizer
Stop reset
Stop demand limit
Close economizer
Use default value
been corrected. If a failure occurs, the following are possible
causes:
Thermistor or Resistor Failure — A shorted or open ther-
mistor or resistor will cause the failure.
Wiring Failure — If a wiring error exists that causes a shorted
or open circuit, this will cause a failure.
Processor Board Failure — If circuitry on processor board
fails, this could cause an error.
The codes are designated as follows:
Code 71 Supply-Air Thermistor Failure
Code 72 Return-Air Thermistor Failure
Code 73 Not used
Code 74 Not used
Code 75 Circuit 1 Saturated Condensing Thermistor
Code 76 Circuit 2 Saturated Condensing Thermistor
CODE 81: RESET THERMISTOR OR POTENTIOMETER
FAILURE — This is a unique code since the reset temperature
potentiometer (P7) is in series with the space temperature ther-
mistor (T10). If either one of these components fail, reset will
be terminated. This error will automatically reset once the situ-
ation is corrected. If an error is detected, the most probable
cause is one of the following:
• Thermistor Failure — A shorted or open thermistor will
cause the failure.
• Potentiometer Failure — If the potentiometer is outside
of the valid range (40 to 90 F), a failure will result.
• Wiring Problem — If the circuit is open, a failure will be
detected.
• Processor Board Failure — If the processor board fails
(hardware), an alarm will be detected.
46
RESET
PROBABLE CAUSE
METHOD
Manual High-pressure switch or high dis-
Manual charge gas thermostat switch
Manual trip, compressor ground current
Manual >2.5 amp or compressor board
relay on when it is not supposed
to be on. Wiring error between
electronic control and compres-
sor protection module.
Manual This indicates either a low refrig-
Manual erant charge, or a loss-of-charge
switch failure.
Manual Not used; Check jumper on pro-
Manual cessor board.
Manual Configuration error (see Note 1).
Auto. Thermistor or resistor failure, wir-
Auto. ing error, or thermistor or resistor
Auto. not connected to the processor
board.
Auto.
Auto.
Auto. Potentiometer improperly con-
Auto. nected, potentiometer setting out
Auto. of range, potentiometer failure or
Auto. wiring error.
Auto.
Auto.