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Troubleshooting (continued)
DR90-AP Service Diagnostic Tree
JUMP ""DEHU" AND
"R" ON THE
TERMINAL BLOCK
T
u r
e
D
y r
D
R
9
0
A -
P
D
e
h
u
m
i d i
c i f
not running
IS THE
DEHUMIDIFIER
RUNNING NOW?
YES
IS THE RELATIVE
HUMIDITY OF THE
SPACE ABOVE
45% RH?
NO
t a
o i
n
S
s y
e t
m
5
0
0
7
7
4
7
0
0 -
0
1
JUMP FLOAT
NO
TERMINALS
TOGETHER
IS THE
DEHUMIDIFIER
RUNNING NOW?
NO
DOES THE
DEHUMIDIFIER
HAVE POWER?
YES
IS 24 VAC
PRESENT ACROSS
"R" AND "C"
TERMINALS?
YES
UNPLUG THE LOW
PRESSURE SWITCH
CONNECTORS AND
JUMP THE WIRES
YES
CHECK FOR CLOGGED
DRAIN OR FIX FLOAT
YES
SWITCH ISSUE
VERIFY POWER AT
NO
OUTLET
CHECK WIRING INSIDE
ELECTRICAL BOX FOR
NO
LOOSE CONNECTIONS
AND POSSIBLE FAILED
TRANSFORMER
NO
DOES THE
COMPRESSOR
COME ON?
YES
PRESSURE SWITCH
HAS FAILED OR THE
SYSTEM IS LOW ON
REFRIGERANT
CHECK CALIBRATION
AND OPERATION OF
DEHUMIDISTAT
DEHUMIDIFIER IS
OPERATING NORMALLY.
WAIT FOR RH TO RISE
TO TEST AGAIN.
M33760
35
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