American Dream Ultra Performance Geothermal Copper Series, Инструкция по установке и обслуживанию

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Page 42 000744MAN-02 25 MAY 2009
PLENUM HEATER TROUBLE SHOOTING
Fault Possible Cause Verification Recommended Action
No 230VAC
across plenum
heater L1 and L2
Disconnect switch open.
(if installed) Verify disconnect switch is in the ON
position. Determine why the disconnect
switch was opened, if all is OK
close the switch.
Fuse blown /
Breaker Tripped. At plenum heater disconnect box (if
installed), voltmeter shows voltage
on the line side but not on the load
side. Check if breaker is tripped. Reset breaker or replace fuse at
plenum heater disconnect box.
Replace fuse with proper size
and type. (Time-delay type “D”)
Same “Line” to L1 and L2 Measuring L1 to ground and L2 to
ground both yield 115VAC, but L1 to
L2 yields 0VAC.
Correct wiring.
No W2 signal at
Heat pump termi-
nal strip No call for auxiliary or
emergency heat from ther-
mostat. Verify that the thermostat is indicat-
ing that auxiliary or emergency heat
should be on. Set thermostat to engage auxil-
iary or emergency heat (note
some thermostats require a
jumper between auxiliary and
emergency. Check the thermo-
stat manual).
Faulty thermostat. Thermostat doesn’t indicate a call
for auxiliary or emergency when it
should. Replace thermostat.
Faulty thermostat. Thermostat indicates auxiliary or
emergency but no 24VAC signal
present across C and the auxiliary
and/or emergency pin at the ther-
mostat. Replace thermostat.
Faulty thermostat wiring. 24VAC signal is present across C
and the auxiliary and/or emergency
pin at the thermostat but no 24VAC
signal is present across W2 and C at
the heat pump terminal strip. Correct wiring.
No 24VAC signal
from C to ground
at the plenum
heater control
connector Plenum Heater trans-
former is burned out. Voltmeter does not show 24VAC
across transformer secondary wind-
ing. Replace transformer.
Plenum heater control
board is faulty. Transformer tested OK in previous
step. Replace control board.
No 24VAC signal
from 1 to ground
at the plenum
heater control
connector Faulty wiring. 24VAC present across C and
ground at the plenum heater, but not
across ground of the plenum heater
and I of the heat pump terminal strip Correct wiring.
Faulty wiring. If previous step tested OK, 24VAC is
present across ground of the plenum
heart and 1 of the heat pump termi-
nal strip, but not across ground of
the plenum heater and 1 of the ple-
num heater. Correct wiring.