Honeywell DR90 Dehumidifier User Manual


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DR90/120 Service Diagnostic Tree
Dehumidiernotrunning
Troubleshooting (continued)
JUMP FLOAT
TERMINALS
TOGETHER
UNPLUG THE LOW
PRESSURE SWITCH
CONNECTORS AND
JUMP THE WIRES
IS THE
DEHUMIDIFIER
RUNNING NOW?
DOES THE
COMPRESSOR
COME ON?
IS THE
DEHUMIDIFIER
RUNNING NOW?
IS 24 VAC
PRESENT ACROSS
“R” AND “C”
TERMINALS?
DOES THE
DEHUMIDIFIER
HAVE POWER?
CHECK FOR CLOGGED
DRAIN OR FIX FLOAT
SWITCH ISSUE
VERIFY POWER AT
OUTLET
CHECK WIRING INSIDE
ELECTRICAL BOX FOR
LOOSE CONNECTIONS
AND POSSIBLE FAILED
TRANSFORMER
DEHUMIDIFIER IS
OPERATING NORMALLY.
WAIT FOR RH TO RISE
TO TEST AGAIN.
PRESSURE SWITCH
HAS FAILED OR THE
SYSTEM IS LOW ON
REFRIGERANT
CHECK CALIBRATION
AND OPERATION OF
DEHUMIDISTAT
JUMP “”DEHU” AND
“R” ON THE
TERMINAL BLOCK
IS THE RELATIVE
HUMIDITY OF THE
SPACE ABOVE
45% RH?
M33760
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
TrueDryDR90/DR120DehumidicationSystem69-2690EFS—04
18
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