42
ACZ 010A through 039A IOMM ACZ1
Service
DANGER
Disconnect and tag-out all sources of power to the unit before doing any service inside the
unit. Failure to do so can cause serious personal injury or death.
CAUTION
Service on this equipment must be performed only by trained, experienced, qualified service
personnel with special regard to regulations concerning release of refrigerant to the
atmosphere.
Note:
Repeated tripping of equipment protection controls must be investigated and
corrected.
Thermostatic Expansion Valve
The field installed expansion valve is responsible for allowing the proper amount of refrigerant to
enter the evaporator regardless of cooling load. It does this by maintaining a constant superheat.
(Superheat is the difference between refrigerant temperature as it leaves the evaporator and the
saturation temperature corresponding to the evaporator pressure.) Typically, superheat should run in
the range of 8°F to 12°F (4.4°C to 6.6°C). Maintaining correct superheat to the compressor is an
important element in extending compressor life.
Filter-Driers
In general, the pressure drop across the field-installed filter-drier should be in the 6 to 10 psi range It
should be monitored and changed when the pressure drop reaches 10 psi. After changing the filter-
drier, check for leaks before recharging and returning unit to operation.
Liquid Line Solenoid
The field installed liquid line solenoid valve does not normally require any maintenance. Reliable
operation of the solinoid valve is necessary for the pump-down function of the unit's control system.
To Next Page
Loading...
Need help?
General