Honeywell PC8900A Manual page 42

SYMPTOM
TEMPERATURE CHANGES
OCCUR AT THE WRONG TIMES.
PRESENT SETTING APPEARS
INACCURATE.
HEAT AND COOL SETPOINTS
NEED TO BE ADJUSTED
REGULARLY.
PC8900 DISPLAY FLASHES
DURING OPERATION.
PARTIAL PC8900 DISPLAY.
COOLING WILL NOT COME ON.
SYSTEM FAN IS RUNNING
INDEPENDENT OF HEATING
OR COOLING EQUIPMENT.
68-0173—3
POSSIBLE CAUSE
PC8900 PROGRAMMED INCORRECTLY.
ADAPTIVE INTELLIGENT RECOVERY™
IS SELECTED.
ADAPTIVE INTELLIGENT RECOVERY™
IS SELECTED.
AND KEYS BEING USED
TO ADJUST TEMPERATURE.
TIME AND DAY HAVE BEEN LOST DUE
TO POWER OUTAGE.
INOPERATIVE PC8900.
NO POWER TO W8900.
PC8900 SYSTEM SETTING IS INCORRECT.
5-MINUTE COMPRESSOR PROTECTION
ACTIVATED.
PC8900 INOPERATIVE.
INCORRECT WIRING.
COOLING EQUIPMENT IS INOPERATIVE.
COOLING SETPOINT IS TOO HIGH.
ROOM TEMPERATURE AT REMOTE
SENSOR LOCATION IS TOO LOW.
PC8900 CONFIGURED FOR ONLY ONE
STAGE OF COOLING.
PC8900 FAN SETTING IS SET AT
FAN CIRC.
PC8900 IS CONFIGURED FOR ELECTRIC
HEAT FAN OPERATION.
PC8900 IS CONFIGURED FOR OVERRUN
IN COOLING.
Fig. 41. Troubleshooting procedures ( Continued ).
42
ACTION
• CHECK THE PROGRAM TIMES FOR THE PERIOD IN QUESTION.
BE SURE THAT AM AND PM INDICATIONS ARE CORRECT.
MAKE SURE THE CURRENT DAY AND TIME ARE CORRECT.
REPROGRAM IF NECESSARY.
• REMEMBER THAT WITH ADAPTIVE INTELLIGENT RECOVERY™
THE HEATING OR COOLING SYSTEM COMES ON BEFORE
THE WAKE AND RETURN START TIMES SO THE HOUSE WILL
BE AT THE DESIRED TEMPERATURE WHEN THE PERIOD
STARTS. SYSTEM CAN BE CONFIGURED FOR CONVENTIONAL
RECOVERY. REFER TO INSTALLATION SECTION.
• REMEMBER THAT WITH ADAPTIVE INTELLIGENT RECOVERY™
THE HEATING OR COOLING SYSTEM COMES ON BEFORE
THE WAKE AND RETURN START TIMES SO THE HOUSE WILL
BE AT THE DESIRED TEMPERATURE WHEN THE PERIOD
STARTS. SYSTEM CAN BE CONFIGURED FOR CONVENTIONAL
RECOVERY. REFER TO INSTALLATION SECTION.
• REPROGRAM PC8900 TO MAKE PERMANENT CHANGE IN
PROGRAM. REFER TO PROGRAMMING INSTRUCTIONS.
• REPROGRAM TIME AND DAY. REFER TO PROGRAMMING
INSTRUCTIONS.
• REPLACE PC8900.
• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND
REPLACE OR RESET IF NECESSARY.
• CHECK THAT COOL SYSTEM POWER IS ON.
• CHECK FOR LOOSE CONNECTIONS AT PC8900, W8900,
C7189, OR EQUIPMENT.
• CHECK THAT PC8900 IS SET TO COOL OR AUTO.
• THE PC8900 HAS A 5-MINUTE BUILT-IN TIME DELAY (IF
ACTIVATED). ALLOW UP TO FIVE MINUTES AFTER CHANGING
THE SETTING BEFORE THE COMPRESSOR STARTS.
• CONDUCT SELF-TEST. SEE CHECKOUT.
• REFER TO MANUFACTURER SPECIFICATIONS TO
TROUBLESHOOT EQUIPMENT.
• SEE WIRING DIAGRAM.
• REFER TO MANUFACTURER SPECIFICATIONS TO
TROUBLESHOOT EQUIPMENT.
• ADJUST SETPOINT USING AND
• RELOCATE REMOTE SENSOR WHERE IT IS NOT AFFECTED
BY HOT AREAS, COLD AREAS, OR DEAD-AIR AREAS.
• RECONFIGURE PC8900 TO ACCOMMODATE ALL STAGES OF
COOLING.
• CIRCULATING FAN FEATURE ALLOWS FAN TO OPERATE
INDEPENDENT OF HEATING OR COOLING EQUIPMENT.
REFER TO OPERATION SECTION.
• RECONFIGURE PC8900 FOR NO ELECTRIC HEAT FAN.
• RECONFIGURE PC8900 FOR NO FAN OVERRUN IN COOLING.
KEYS.
M18743