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www.manitowocfsusa.com 800-225-9916 13
Refrigerant Charging
The refrigerant charge should be added to the system through the liquid line service
valve. Do not charge liquid refrigerant into the suction service valve! The initial charge
should be determined by weight and sight glass indication. Start the system. If the
condensing temperature is 105° F or greater, charge the system until the sight glass
clears. If the condensing unit temperature is below 105° F, reduce the condenser face
surface area to raise the discharge pressures above 105° F and proceed to charge to a
clear sight glass. Return to a full condenser face area when charging is complete.
CAUTION
Do not charge liquid refrigerant into the suction service valve. Do not overcharge the
system. These conditions can permit liquid refrigerant to enter the compressor and
cause damage to internal components resulting in premature system failure.
Operational Start-Up
The first 2 – 4 hours of operation after initial start-up is a critical time. Do not just start
the system and leave. Pressure values, compressor and evaporator superheat, and
inspecting for excessive vibrations and loose connections are some of checks that must
be performed prior to leaving the system.
Pre-Start Checks:
Verify that all service valves are fully open.
Ensure that all refrigerant and electrical connections are tight.
Verify that the wiring and piping is properly routed and secured.
The compressor mounting bolts are properly adjusted (see compressor mounts
on page 14).
All fan motors and mounting brackets are tight.
The condensing unit base and evaporator coil are properly secured.
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