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SHR
V2500DD
Trouble Shooting Guide
25
Symptom
Cold suppl
y damper
closed during fan on
Defrost damper open
during fan on
Defrost cycle inac-
tive
Both dampers do not
change
One fan motor fails
to start
LED Control panel
does not illuminate
at porwer up
P
ossible Cause
Defecti
ve damper
motor.
Damper motor
improperly wired
See above.
Cold supply air tem-
perature too warm
Defective control
relay
Defective Main
Control Board
Defective motor con-
tactor
Defective overload
protector
Defective
Transformer
Defective Main con-
trol transformer
Solution
Replace damper motor
Refer to wiring diagram, reverse
wires to damper motor at SPDT relay in
control box.
If air temperature entering HRV is above
-3 deg C then defrost cycle will not
activate. If air temperature is below –3 C
Disconnect leads at temperature sensor
and splice leads going to control box
together. Power up unit, HRV will cycle
through one run cycle (approx. 25
minutes) then a defrost cycle should
initiate. If it does, replace sensor, if it
does not, replace control.
SPDT damper motor control relay should
respond as the Select switch on the Main
Control Board is cycled. If relay does not
respond then replace. Note that capaci-
tors must be positioned across the leads
to the damper motor windings on the
relay.
Replace control board if no power output
to relay coil. Should be 24vac. During
fan on cycle.
Replace. Refer to parts list for correct
type for motor application.
Replace. Refer to parts list for correct
type for motor application.
Check secondary voltage. Should be
120vac Illuminate at power up. If not,
replace.
Replace.
2500DD-Install-ENG 1/17/06 5:56 PM Page 25
Summary of Contents for SHRV2500DD
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