Heatcraft Refrigeration Products Condensing Units H-IM-CU - Manual (Page 15)

15
Check Out and Start Up
After the installation has been completed, the following points should be
covered before the system is placed in operation:
Check all electrical and refrigerant connections.
Be sure they are all tight.
Observe compressor oil level before start-up. The
oil level should be at or slightly above the 1/4 level
of the sight glass. Refer to Table 3 for proper compressor oil.
Remove upper mounting nuts on the compressor feet.
Remove the shipping spacers. Install the neoprene washers onto
the compressor feet. Replace the upper mounting nuts
and washers, allowing 1/16" space between the mounting nut
and the neoprene spacer.
Check high and low pressure controls, pressure regulating valves,
oil pressure safety controls, and all other safety controls, and
adjust if necessary.
Check the room thermostat for normal operation
and adjust.
Wiring diagrams, instruction bulletins, etc. attached to the
condensing units should be read and filed for future reference.
All fan motors should be checked for proper rotation. Fan
motor mounts should be carefully checked for tightness and
proper alignment.
Electric and hot gas evaporator fan motors should
be temporarily wired for continuous operation until
the room temperature has stabilized.
Observe system pressures during charging and initial operation.
Do not add oil while the system is short of refrigerant
unless oil level is dangerously low.
Continue charging until system has sufficient refrigerant for
proper operation. Do not overcharge.
Remember that bubbles in a sight glass may be caused by
a restriction as well as a shortage of refrigerant.
Do not leave unit unattended until the system has
reached normal operating conditions and the oil
charge has been properly adjusted to maintain the oil
level between 1/4 and bottom of the sight glass.
Make sure all Schrader valve caps are in place and tight.
Make sure ALL service valves are properly back-seated and tighten
valve packing if necessary.
a)
b)
c)
d)
e)
f)
g)
h)
i)
j)
k)
l)
m)
CAUTION:
Extreme care must be taken in starting compressors for the first time
after system charging. At this time, all of the oil and most of the
refrigerant might be in the compressor creating a condition which could
cause compressor damage due to slugging. Activating the crankcase
heater for 24 hours prior to start-up is required. If no crankcase heater is
present, then directing a 500 watt heat lamp or other safe heat source on
the lower shell of the compressor for approximately thirty minutes will be
beneficial in eliminating this condition which might never reoccur.
WARNING:
Scroll compressor is directional dependent. If noisy, change phase of
input wiring.