Maritime Geothermal TF-45, Инструкция по установке и обслуживанию

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1-Jul-2017 Page 57 001223MAN-05
PLENUM HEATER TROUBLESHOOTING
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 po-
sition.
Determine why the disconnect switch
was opened, if all is OK close the
switch.
Fuse blown /
breaker tripped.
At plenum heater disconnect box (if in-
stalled), voltmeter shows voltage on the
line side but not on the load side. Check
if breaker is tripped.
Reset breaker or replace fuse at ple-
num 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 emer-
gency heat from thermostat.
Verify that the thermostat is indicating
that auxiliary or emergency heat should
be on.
Set thermostat to engage auxiliary or
emergency heat. (Note that some
thermostats require a jumper be-
tween auxiliary and emergency.
Check the thermostat manual.)
Faulty thermostat. Thermostat doesn’t indicate a call for
auxiliary or emergency when it should.
Or thermostat indicates auxiliary or emer-
gency but no 24VAC signal present
across C and the auxiliary and/or emer-
gency pin at the thermostat.
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 pre-
sent across W2 and C at the heat pump
terminal strip.
Correct wiring.
No 24VAC signal
from C to ground
at the plenum
heater control
board
Plenum Heater transformer is
burned out.
Voltmeter does not show 24VAC across
transformer secondary winding.
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 plenum eater relay in
heat pump
24VAC is present across pin 1 and pin 3
of the relay, 24VAC is present from heat
pump terminal strip “I” to plenum heater
ground, but not from heat pump terminal
strip 1 to plenum heater ground.
Replace relay.
Faulty wiring. If previous step tested OK, 24VAC is pre-
sent across ground of the plenum heart
and 1 of the heat pump terminal strip, but
not across ground of the plenum heater
and 1 of the plenum heater.
Correct wiring.