Operational Check-Out; Installation Of Thermostat (Optional) - LG LK-C0608A Installation Manual

DIMENSIONAL DATA
12

Operational Check-out

Room unit has been wired according to the
wiring diagram. Unit to be in cooling mode
and there should be sufficient load on the
evaporator coil for the unit to operate. After
the system has been has operated for at least
two hours at normal operating conditions
without any indication of malfunction, it
should be allowed to operate over-night on
automatic controls
Then a thorough recheck of the entire system
operation should be made as follows:
a. Check compressor head and suction pres-
sures. If not within system design limits,
determine why and take corrective action.
b. Check liquid line sight glass and expansion
valve operation. If there are indications that
more refrigerant is required, leak test all
connections and system components and
repair any leaks before adding refrigerant.
c. When applicable, observe oil level in com-
pressor crankcase sight glass, and add oil
as necessary to bring level to center of the
sight glass.
d. Thermostatic expansion valves must be
checked for proper superheat settings.
Sensing bulbs must be in positive contact
with the suction line. Valves with high
superheat settings produce little refrigera-
tion and poor oil return too little superheat
causes low refrigeration capacity and pro-
motes liquid slugging and compressor bear-
ing washout.
e. All fan motors on air cooled condensers,
evaporators, etc. should be checked for
proper rotation. Fan motor mounts should
be carefully checked for tightness and prop-
er alignment. If belt drives are used, check
the belt tension. All motors requiring lubri-
cation should be oiled or greased as neces-
sary.
f. Using suitable instruments, carefully check
line voltage and amperage at the compres-
sor terminals. Voltage Must be within 10%
of that indicated on the compressor name-
plate. If high or low voltage indicated, notify
the power company. The current normally
should not exceed 120% of the nameplate
rating. If amperage draw is excessive,
immediately determine the cause and take
corrective action. On three phase motor-
compressors, check to see that a balanced
load is drown by each phase.
g. Measure the current consumption and com-
pare it with the nominal motor current on
the fan type plate or Motor rating plate. If
there is continuous overload switch the
centrifugal fan off immediately. Check that
the fan runs smoothly and quietly Ensure
that there are no unusual oscillations or
vibrations. Check the motor for any abnor-
mal noises.
Check that the fan runs smoothly and quietly
ensure that there are no unusual oscillations
or vibrations. Check the motor for any abnor-
mal noises.

Installation of thermostat (Optional)

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