42PQV/38VBH
GB - 18
Pump Down and refrigerant cycle
Gas
Liquid + Gas
Liquid
Cooling cycle
Heating cycle
Legend:
Outdoor coil
Compressor
Check valve
Strainer
Vapor valve
Liquid valve
Service pressure port
Indoor until coil
Liquid distributor
Cooling + Heating expansion device
Heating expansion device
Additional suction acumulator
Reversing valve
Filter drier
Discharge muffler
Pump-down
Pump-down is an operation intended to collect all the system
refrigerant in the outdoor unit.
This operation must be carried out before disconnecting the
refrigerant tubing in order to avoid refrigerant loss to the
atmosphere, if it becomes necessary to disconnect the
refrigerant connections for unit repair, removal or disposal
in this case, after removal, unit must be delivered to an
appropriate disposal centre or the original dealer.
Refrigerant Cycle
Heat pump unit
Shut off the liquid valve with the Allen wrench.
Turn the system on in cooling with fan operating at high velocity.
(Compressor will immediately start, provided 3 minutes have
elapsed since the last stop).
After 2 minutes of operation, shut the suction valve with the same
wrench.
Turn the system off and switch mains supply off.
Disconnect tubing.
After disconnection, protect valves and tubing ends from dust.
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