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Internal winding
grounded to
the
compressor
shell.
Replace the
compressor.
If
compressor burnout occurs,
install
filter
drier
at
suction
line.
Compressor
Motor
Grounded
Compressor
Windings
0pen
Check
continuity or
the
compressor
windings with
an
ohmmeter.
If
the
windings
are open, replace the
compressor.
Blower motor
runs
but no
compressor
(Cont.)
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.
Thermostat
Improperly
located thermostat
(e.g. near
kitchen), inaccurately
sensing the
comfort
level
in
the
living
area.
Aquastat
The
differential
is
set
to close on aquastat.
Increase
differential
setting to
1s?'.
Wiring
and
Controls
Loose
wiring
connections, or
control
contactor defective.
Unit
Short
Cycles
Compressor Overload
Defective
compressor overload, check
and
replace
ifnecessary
If
the
compressor runs too hot,
it
may
be due
to
a
insufficient
refrigerant
charge.
Water
Lack of sufficient
pressure,
temperature, and/or quantity
of
water.
Unit
Undersized
Recalculate
heat gains
or
losses
for
space
to
be
conditioned.
If
excessive,
rectify by
adding
insulation,
shading,
etc.
Loss
of
Conditioned
Air
by Leaks
Check
for
leaks
in ductwork or infioduction of
ambient air through
doors
and
windows.
Thermostat
Improperly
located thermostat
(e.g. near
kitchen), inaccurately
sensing the
comfort
level
in
the
living
area.
Check
anticipator
setting.
Airflow
Lack of
adequate
airflow
or improper
distribution of
air.
Check
the
motor
speed
or duct
sizing.
Check
the
filter, it
should
be
inspected
every month
and changed
if dirty.
Remove or
add resistance
accordingly.
Refrigerant
Charge
[,ow
on
refrigerant
charge
causing
inefficient operation. Adjust only
after checking
CFM
and
GPM.
Compressor
Check
for
defective compressor.
If
discharge pressure
is too
low
and
suction
pressure
is too
high,
compressor is not
pumping
properly.
Replace
compressor.
Reversing
Valve
Defective reversing valve creating
blpass of
refrigerant
from
discharge
to
suction
side
of
compressor. When
it
is necessary
to
replace
the
reversing valve, wrap
it
with
a
wet
cloth
and
direct
heat
away.
Excessive
heat can damage the
valve.
Insufficient
cooling or
heating.
Desuperheater
The
desuperheater
circuit (in-line
fuse) should
be
disconnected
during
cold
weather to
allow
full
heating load to
the house.
Dirty Filter
Check
filter.
Clean or
replace
if
found
dirty
Thermostat
Improperly
Set
Check
if
thermostat is
set
at
correct
temperature.
Defective Thermostat
Check thermostat
operation.
Replace
if
found defective.
Incorrect
Wiring
Check
for
broken, loose, or incorrect wires.
Blower Motor
Defective
Check
blower
motor
in
one
of
the
other switch
positions.
If
it
does
not
operate,
check
for
open
overload.
If
overload
is
open
and
motor
is
not
overheated,
replace
it.
Unit
will
not
operate
on
"heating"
(Heats
only)
Aquastat
Set
too
High
Heat pump
is
trying
to
heat
hot water to too hot
of
a
temperature (over
120"F).
Reduce aquastat setpoinr.
will
not
move.
Switch
from
heating to
cooling
a
few
times to loosen
valve.
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