Honeywell TrueDRY DR90-AP Professional Installation Manual page 34

Troubleshooting (continued)
DR90-AP Technician Function Test
CONNECT A SHORT
WIRE BETWEEN "DEHU"
AND "R" AT WIRING
TERMINAL BLOCK
DO BOTH FAN AND
COMPRESSOR
COME ON?
YES
DOES THE FAN
SOUND NORMAL?
YES
REMOVE THE FILTER
AND FEEL THE
EVAPORATOR COIL
IS THE EVAPORATOR
COLD? (LIKE HOLDING
A COLD DRINK)
YES
32
PLUG DEHUMIDIFIER
INTO OUTLET THAT
HAS POWER
JUMP THE FLOAT
NO
TERMINALS TOGETHER
ONLY FAN COMES ON
ONLY COMPRESSOR COMES ON
NO
INLET AIR INLET AIR
TEMPERATURE HUMIDITY
80° F( 2 6 . 7 ° C) 60% RH
60% RH
70° F( 2 1 . 1 ° C)
60% RH
60° F( 1 5 . 6 ° C)
CONDUCT A PERFORMANCE TEST:
LEAVE THE DEHUMIDISTAT ON
DR90-AP IN THE "ALWAYS ON"
POSITION AND COLLECT DRAIN
NO
WATER FOR 24 HOURS. COMPARE
AMOUNT OF WATER COLLECTED
TO EXPECTED RANGE ABOVE.
DOES THE OUTLET
NO
HAVE POWER?
VERIFY POWER
AT OUTLET
NO
DO BOTH FAN AND
COMPRESSOR
COME ON?
DR90: GALLONS
COLLECTED IN
24 HOURS
10 TO 12.5
8.5 TO 10.5
5 TO 6.5
IS THE AMOUNT OF
WATER COLLECTED
IN THE RANGE
EXPECTED?
YES
TrueDry DR90-AP Dehumidification System 50077470-001
SEE DR90-AP
SERVICE DIAGNOSTIC
YES
TREE
CLEAN DRAIN
LINES AND CHECK
FLOAT SWITCH
YES
CHECK THE FOLLOWING:
FAILED COMPRESSOR
OVERLOAD, FAILED
COMPRESSOR, WIRING,
DEFROST PROBE, LOW
PRESSURE SWITCH
CHECK THE FOLLOWING:
SWITCH, FAN, CAPACITOR,
RELAY, WIRING
CHECK THE FOLLOWING:
MECHANICAL ISSUE
WITH IMPELLER, MOUNT
OR SHROUD
SEE DR90-AP
SERVICE DIAGNOSTIC
TREE
NO
NORMAL OPERATION.
TURN DEHUMIDISTAT
BACK TO SETTING OR
"OFF" POSITION.
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