17
Refrigerant Charging.
When charging a system with refrigerant
that is in a vacuum with vacuum pump,
the above process is very important to
remove moisture inside system. The
moisture can cause system damage or
failure.
Charge refrigerant into a system through
a filter/drier in the charging line. This
extra drier will insure that all refrigerant
supplied to the system is clean and dry.
Weigh the refrigerant drum before
charging so an accurate record can be
kept of the weight of refrigerant put in
the system. Liquid refrigerant can be
added directly into the receiver tank and
charging 90% of system refrigerant
capacity.
Start the system and finish charging until
the sight glass indicates a full charge and
the proper amount have been weighed in.
If the refrigerant must be added to the
system through the suction side of the
compressor, charge in vapor form only.
Liquid charging must be done in the high
side only and with liquid metering devices.
If R-404A is used, liquid must be charged
and read up refrigerant explanatory.
Start-up.
Use the following operating procedure after the installation has been completed,.
1)
Check all electrical and refrigerant connections. Check if the electrical status is
in manual and if there are no holes in the refrigerant lines. Start-up
2)
Check all fans on the evaporator and condensing unit to be sure they are
operational and turning the proper direction.
3)
Check high and low pressure switch, pressure regulating valves, and adjust if
necessary.
4)
Continue charging until system has sufficient refrigerant for proper operation.
Do not overcharge. Bubbles in a sight glass may be caused by a restriction as
well as a shortage of refrigerant. Check service valve and open if refrigerant is
sufficiently charged and you still have bubbles in the sight glass.
5)
Observe system and do not leave unit unattended until the system has reached
normal operating conditions.
WARNING : SCROLL COMPRESSOR IS DIRECTIONAL DEPENDENT.
IF NOISY, SWITCH ANY TWO SUPPLY LINES.