Portable Chiller: MGD-15W-ADV-02
Page: 52
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: 317-881-1277
Service Department Fax: 317-885-8683
5.5
CHECKING THE REFRIGERANT CHARGE
A.
All standard chillers are manufactured with thermostatic
expansion valves as the metering device to the evaporator.
B.
All standard chillers have a refrigerant sight glass with a
moisture indicator. To check the refrigerant charge under
normal operating conditions:
1.
Remove the plastic cap covering the sight glass.
2.
Start the chiller and allow system pressures and
temperatures to stabilize.
Sight Glass
3.
With the unit operating at 100% capacity (not in the “capacity control” mode)
the sight glass should appear clear with no foam or bubbles evident. If foam or
bubbles are evident, the chiller has suffered from a loss of refrigerant and should
be checked by a qualified refrigeration technician.
4.
The “dot” in the middle of the sight glass is the moisture indicator. It should
appear green at all times. A white or yellow color indicates moisture has invaded
the refrigeration system, which is detrimental to the life of the compressor. The
filter-drier should be replaced by a qualified refrigeration technician.
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