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Manual
Filling the system
Verification before
commissioning
Start-up
8
BC251686497767en-US0801
Installation & Maintenance
• Wear protective stuff like goggles and protective
gloves.
• Never start the compressor under vacuum. Keep
the compressor switched off.
• Before charging the refrigerant, verify that the oil
level is visible in the oil sight glass and between
25% to 75% full.
• Use only the refrigerant for which the unit is
designed for.
• Fill the refrigerant in liquid phase into the
condenser or liquid receiver. Ensure a slow
Use safety devices (such as safety pressure
switches and mechanical relief valves) in
compliance with both generally and locally
applicable regulations and safety standards. Make
sure that the devices are operational and properly
set.
Check that the settings of high-pressure
switches and relief valves don't exceed the
maximum service pressure of any system
component.
• Never start the unit when no refrigerant is
charged.
• All service valves must be in the open position.
• Check compliance between unit and power
supply.
• Check that the crankcase heater is working.
• Check that the fan can rotate freely.
• Check that the protection sheet has been
removed from the backside of condenser.
• Balance the HP/LP pressure.
• Energize the unit. It must start promptly. If
the compressor does not start, check wiring
conformity, voltage on terminals and sequence
phase.
charging of the system to 58 - 70psi for R404A/
R507A or R22, and approx. 30psi for R134a.
• Do not put liquid refrigerant through the suction
line.
• It is not allow to mix additives with the oil and/or
refrigerant.
• The remaining charge is done until the
installation has reached a level of stable nominal
condition during operation.
• Never leave the filling cylinder connected to the
circuit.
Warning – Charging from
suction valve during start up can
damage the compressor.
• Verify that all electrical connections are
properly fastened and in compliance with local
regulations.
• When a crankcase heater is required, it must be
energized at least 12 hours before initial start-up
and start-up after prolonged shut-down or belt
type crankcase heaters.
• Eventual reverse rotation of a 3-phase
compressor can be detected by the following
phenomena: unit doesn't start, the compressor
doesn't build up pressure, it has abnormally
high sound level and abnormally low power
consumption. In such case, shut down the unit
immediately and connect the phases to their
proper terminals.
• If the rotation direction is correct, the low-
pressure gauge shall show a declining pressure
and the high-pressure gauge shall show an
increasing pressure.
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