i-'
XII.
TROUBLESHOOTING
GUIDE
FOR
UNIT OPERATION
Blown Fuse/Tripped
Circuit Breaker
Replace fuse
or
reset
circuit
breaker.
(Check
for
correct size
fuse and circuit
breaker.)
Blown Fuse
on Controller
Replace fuse
on controller.
(Check
for correct
size fuse.)
Broken
or Loose
Wires Replace
or tighten the wires
Voltage
Supply Low
If
voltage
is
below minimum voltage
on data
plate,
contact
local
power
company.
Low
Voltage
Circuit Check24
volt ffansformer for
burnout or voltage less than 18
volts.
Thermostat
Set thermostat on
"Cool" and lowest temperature
setting, unit
should run. Set thermostat
on
"Heat"
and highest temperature
setting, unit should run.
If unit does not run in
both cases, the
thermostat
could be wired incorrectly
or be
faulty.
To
prove
faulty or miswired
thermostat,
disconnect thermostat wires at the
unit and
jumper
between
"R", "Y",
and
"G"
terminals
and unit
should run. Replace thermostat with
correct heat
pump
thermostat
only
A substitute may not work
properly.
Entire
unit does
not run
Interruptible
Power
Check
incoming
supply voltage
Thermostat
Check
setting, calibration, and wiring. If thermostat has
an
anticipator,
set
it
at
1.0
or I.2.
Wiring
Check for loose
or broken
wires
at compressor, capacitor, or
contactor.
Blown Fuse
Replace fuse
or
reset
circuit breaker.
(Check
for correct size
fuse
or circuit breaker.)
High
or Low Pressure
Controls
The unit could be
off on the
high
or
low
pressure
cutout control.
Check water GPM, air CFM and filter, ambient temperature
and
loss
of
refrigerant. If
the unit still
fails
to
run,
check for faulty
pressure
controls individually. Replace if defective.
Defective
Capacitor Check capacitor. If defective; remove, replace, and rewire correctly
Voltage
Supply
Low
If voltage is below minimum voltage
specified on the data
plate,
contact local
power
company. Check
voltage
at compressor
for
possible
open terminal.
Low Voltage
Circuit Chec,k24
volt
transformer
for
burnout or
voltage less
than
18
volts.
With a
voltmeter,
check signal
from
thermostat at
Y to X,
M1
on controller to
X,
and the capacitor
voltage
drop. Replace
component that does not
energize.
Compressor Overload
Open
In all
cases an
"internal"
compressor overload
is
used.
If the
compressor motor is
too
hot,
the
overload will not reset until the
compressor cools down. If the compressor is cool and the
overload does not reset,
there
may
be a
defective
or open
overload. Replace the compressor.
Compressor Motor
Grounded
Internal winding
grounded
to the compressor shell.
Replace
the
compressor. If compressor burnout occurs, install filter drier at
suction line.
Compressor Windings
Open
Check continuity or the compressor windings with an ohmmeter
If the windings are open, replace the compressor.
Blower motor
runs but
compressor
does not, or
compressor
short cycles.
Seized Compressor Try an auxiliary capacitor in
parallel
with
the
run
capacitor
momentarily. If
the compressor still does not start, replace it.
Thermostat
The differential is set too close to the thermostat. Readjust heat
anticipator to 1.0
or
1.2.Unit Short
Cycles Thermostat Improperly located thermostat
(e.g.
near kitchen), inaccurately
sensing the comfort level in the living area.
13
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