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DR90/120 Technician Function Test
Troubleshooting (continued)
80F
(26.7C)60%
RH 10 TO 12.5
70F
(21.1C) 60%
RH 8.5 TO 10.5
60F (15.6C) 60% RH 5 TO 6.5
INLET AIR
TEMPERATURE
INLET AIR
HUMIDITY
DR90: GALLONS
COLLECTED IN
24 HOURS
13.5 TO 16.5
10.25 TO 12.5
7.25 TO 9
DR120:GALLONS
COLLECTED IN
24 HOURS
M33756
CONNECT A SHORT
WIRE BETWEEN “DEHU”
AND “R” AT WIRING
TERMINAL BLOCK
CHECK THE FOLLOWING:
FAILED COMPRESSOR
OVERLOAD, FAILED
COMPRESSOR, WIRING,
DEFROST PROBE, LOW
PRESSURE SWITCH
DO BOTH FAN AND
COMPRESSOR
COME ON?
DOES THE FAN
SOUND NORMAL?
REMOVE THE FILTER
AND FEEL THE
EVAPORATOR COIL
IS THE EVAPORATOR
COLD? (LIKE HOLDING
A COLD DRINK)
PLUG DEHUMIDIFIER
INTO OUTLET THAT
HAS POWER
VERIFY POWER
AT OUTLET
DOES THE OUTLET
HAVE POWER?
SEE DR90/120
SERVICE DIAGNOSTIC
TREE
CLEAN DRAIN
LINES AND CHECK
FLOAT SWITCH
CHECK THE FOLLOWING:
SWITCH, FAN, CAPACITOR,
RELAY, WIRING
CHECK THE FOLLOWING:
MECHANICAL ISSUE
WITH IMPELLER, MOUNT
OR SHROUD
SEE DR90/120
SERVICE DIAGNOSTIC
TREE
NORMAL OPERATION.
TURN DEHUMIDISTAT
BACK TO SETTING OR
“OFF” POSITION.
IS THE AMOUNT OF
WATER COLLECTED
IN THE RANGE
EXPECTED?
CONDUCT A PERFORMANCE TEST:
LEAVE THE DEHUMIDISTAT ON
DR90/120 IN THE “ALWAYS ON”
POSITION AND COLLECT DRAIN
WATER FOR 24 HOURS. COMPARE
AMOUNT OF WATER COLLECTED
TO EXPECTED RANGE ABOVE.
NO
YES
YES
NO
NO
YES
NO
YES
YES
NO
ONLY FAN COMES ON
DO BOTH FAN AND
COMPRESSOR
COME ON?
JUMP THE FLOAT
TERMINALS TOGETHER
YES
NO
ONLY COMPRESSOR COMES ON
TrueDryDR90/DR120DehumidicationSystem69-2690EFS—04 15