Installation, Operation and Maintenance Manual
VariCool EZ-Fit
28
Subject to change without notice.
Refrigerant System
Each refrigerant circuit contains a liquid line sight glass
If bubbles appear in the sight glass, the system is either
undercharged with refrigerant or there may be a restriction in
the liquid line upstream of the sight glass However, bubbles
will appear every now and then in units with a hot gas
bypass valve Bubbles will also appear upon compressor
start up, but normally clear to pure liquid after a few minutes
of operation
Check the filter drier for obstructions If the temperature drop
across the filter drier is more than 3° to 5°, there is a good
likely hood that the filter drier is blocked to some extent and
should be replaced
The sight glass contains a moisture indicator that changes
color when moisture is present in the refrigerant system glass
If the color of this indicator is green or blue, the refrigerant is
normal When the indicator is yellow, an abnormal condition
exists, such as moisture within the refrigerant circuit If an
abnormal appearance exists, servicing is required by a
qualified technician
INFORMATION
After installation and during equipment
start up, the sight glass may appear pink
or purple This occurs during prolonged
periods of non-operation and should turn
blue or green after several hours (up to
12) of operation
Water Side Economizer Coil
If a unit contains the optional water side economizer coil it
may also require a periodic cleaning These coils will need
to be cleaned using a chemical solution These are available
commercially Follow all manufacturer recommendations
and safety warnings
Water Valves
At least once a quarter check the water vales to make sure
that no leaks are present Look at the valve stem and all
piping joints
If any leaks are found follow the manufacturers
recommendations for tightening any seals or replacing any
gaskets
