MODEL PCA090480WH
CHAPTER 2
SERVICE
Section 2: Safety Precautions
March 2013
2-2
Proprietary/Confidential
Page
35
© 2013 Twist, Inc.
1. General
Precautions
WARNING: AVOID CONTACT WITH THE TOP OF A SCROLL
COMPRESSOR. COMPRESSORS BECOME HOT DURING
NORMAL OPERATION.
WARNING: NEVER REMOVE THE COMPRESSOR FROM THE UNIT
WITHOUT REMOVING THE REFRIGERANT PRESSURE
FROM BOTH THE HIGH AND LOW SIDE OF THE SYSTEM.
FAILURE TO DO SO COULD RESULT IN SERIOUS INJURY
OR DEATH, BECAUSE THE ESCAPING PRESSURIZED OIL
AND REFRIGERANT MIXTURE COULD BE IGNITED BY THE
TORCH FLAME.
NOTE:
Since the compressor’s scroll flanks may seal the refrigerant
pressure between the high and low sides preventing pressure
equalization through the compressor, remove the refrigerant
charge from both the high and low side of the compressor before
removing the compressor from the system.
Whenever
performing
work
on
the unit, turn off the external
power and ensure that all OHSA and/or company safety
requirements are met.
NOTE:
The actuator handle mounted on the control panel door is
equipped with provisions for inserting a lockout device when
placed in the OFF position. Always lock the actuator handle "off"
when working on the unit.
If
the
control
panel
door is open when the breaker handle
actuator is in the "ON" position, the safety switch will trip the
circuit breaker shunt trip and turn the circuit breaker “OFF”. To
work on the unit with the door open and to turn on the power, the
safety switch can be pulled out to by pass the safety switch. The
power then can be turned on.
Use extreme caution when
working on the unit with power ON.
Property of American Airlines
