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X. CONDENSER
FAN
1. Remove
2 screws at bottom
and 2 screws
along sides of
condenser
air intake
grille and remove
plastic
grille.
2. Inspect
the fan blades
for cracks
or bends.
3. If fan needs to be removed,
loosen the setscrew
and slide
the fan off the motor shaft.
4. When
replacing
fan blade,
position
blade
so that
lead-
ing edge is 1/z in. in front of fan orifice. See Fig. 18.
5. Ensure
that setscrew
engages
the fiat area
on the me
tar shaft
when
tightening.
6. Replace
grille.
XI. ELECTRICAL CONTROLS AND WIRING
Inspect
and check
the electrical
controls
and
wiring
annu
ally. Be _szlr'ere turn off'the ga_s _supIrl_ and then tire electrical
power
re tire zmfr.
Remove the control, blower, and compressor
compartment
ac-
cess panels to locate all the electrical
controls and wiring. Check
all electrical
connections
fox"tightness.
Tighten
all screw con
nections.
If any smoky or burned
connections
are noticed,
dis-
assemble
the connection,
clean all the parts,
restrip
the wire
end, and reassemble
the connection
properly
and securel N
After inspecting
the electrical
controls
and wiring,
replace
all
the panels.
Start
the unit, and observe
at least one complete
heating
cycle and one complete
cooling cycle to ensure
proper
operation.
If discrepancies
are observed
in either
or both op-
erating
cycles, or if a suspected
malflmction
has occurred,
check
each electrical
component
with the proper
electrical
instru
mentation.
Refer to the unit wiring
label when making
these
checkouts.
NOTE:
Refer
to the
heating
and/or
cooling
sequence
of op
eration
in this
publication
as an
aid
in determining
proper
control
operation.
XII. REFRIGERANT
CIRCUIT
Inspect
all refrigerant
tubing
connections
and the unit base
fox" oil accumulations
annually.
Detecting
oil generally
indi
cares a refl'igerant
leak.
If oil is detected
or if low cooling
performance
is suspected,
leak-test
all refrigerant
tubing
using
an electronic
leak-
detector,
halide
torch, or liquid soap solution.
If a refrigerant
leak is detected,
refer to Check for Refl'igerant
Leaks
section
on page 16.
If no refrigerant
leaks
are found
and
low cooling
perfor-
mance
is suspected,
refer to Checking
and Adjusting
Refrig-
erant
Charge
section
on page 20.
XIII. GAS INPUT
The gas input does not require
checking
unless improper
heat-
ing performance
is suspected.
If a problem
exists,
refer
to
Start
Up section
on page 16.
XIV. EVAPORATOR
AIRFLOW
The heating
and/or
cooling airflow does not require
checking
unless
improper
performance
is suspected.
[ta
problem
ex-
isr_s, be sure that oH _sUi)lrlF- and retzmn-ah" gz'illes are open
and bee O'om ob.stfuctions, and that tire oh" i/ire1" ZscJean. When
necessary, refer to Evaporator
Airflow
and Airflow
Adjust
ments
section
on page 24 to check the system
airflow.
XV, METERING
DEVICE-
ACUTROL
TM
DEVICE
This metering
device
is a fixed orifice and is located
in the
header
to the evaporator
coil.
XVI. LIQUID LINE STRAINER
The liquid line strainer
(to protect
metering
device)
is made
of wire mesh and located
in the liquid line on the inlet side of
the metering
device.
33
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