ClimaCool IOM AR2 SERIES - Manual (Page 30)

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SECTION 3.0 - START-UP
3.1 General
Once installation is complete, check the following:
• All refrigerant and electrical connections must be tight .
Tighten all loose wire terminal connections that may have
loosened in shipping .
• The compressor oil is at the proper level in the oil sight
glass (when provided) for the compressor being used . See
“Compressor Oil Charge .”
• Check initial settings of thermostats and pressure controls .
All adjustable pressure controls and valves will require a final
adjustment with the use of a compatible gauge
• Check the control panel to be sure that all wiring is in accord
with the unit wiring diagram .
• Check all three phase motors for proper rotation .
3.2 Compressor Precautions
Care must be taken when initially starting a system or when the
system has been off for an extended period . At this time, the
compressor may contain liquid refrigerant . Simply starting the
system and walking away may result in irreparable compressor
damage not covered under warranty . To prevent compressor
damage, one or more of the following steps may be used:
• All compressors can be supplied with optional crankcase
heater . These must be activated for 24 hours prior to starting
the compressor . Be sure to check that the heater is functional .
This can be done by simply touching the compressor in the
area of the heater . It should feel warm to the touch . This
check should be performed shortly after energizing the heater
and again prior to starting the compressor . If the compressor
is cold, do not attempt to start it . Locate the source of the
problem, correct it and wait 24 hours before starting the
compressor .
• Use a “safe” heat source such as a heat lamp on the
compressor crankcase for approximately ½ hour before
start-up . Never use a torch or heat gun . They can raise system
pressures to dangerous levels in a very short time resulting in
injury to personnel as well as property damage .
• After following steps 1 and 2 above, you can be relatively
certain that no liquid refrigerant is left in the compressor . This
does not mean that liquid refrigerant is not present elsewhere
in the low side . To avoid compressor damage on startup,
deactivate the liquid solenoid and “bump” the compressor,
using the controller “POWER” switch, several times . The
first 2 or 3 times the compressor is “bumped”, it should not be
allowed to run more than 2 or 3 seconds . Increase the run time
to 5, 10 and 15 seconds over the next 3 “bumps” . This will
rapidly reduce low side pressure causing any liquid to boil off
quickly . At this point it is usually safe to allow the compressor
to run .
• After starting the compressor, listen for unusual sounds
such as knocking . Should they be heard, immediately stop
the compressor . Do not restart until the problem is resolved .
While scroll compressors are more tolerant to liquid
refrigerant than reciprocating types of compressors, the above
precautions should still be observed Rotational direction is
very important with three phase scroll compressors . Running
these compressors with reversed rotation will result in damage
not covered by warranty . When starting a three phase scroll
compressor, refrigerant pressure gauges must be attached to
both the high and low pressure ports provided on the system .
With the compressor rotating in the proper direction, system
suction pressure should drop and discharge pressure should
rise to appropriate levels within a few seconds after the
compressor is started . If this is not the case, the compressor
is probably running in reversed rotation . Each chiller is
computer tested and all three phase motors (i .e . pumps and
compressors) are in proper phase when it leaves the factory .
Turn the power off at the main disconnect and reverse any two
of the three main power leads and restart . Observe the suction
and discharge pressure gauges to verify that the compressor
is rotating correctly . If pressures are still not appropriate,
some other problem has developed which must be found and
corrected prior to running the system .
Split System Start Up