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38BC / 38BH
Pump Down and check the refrigerant charge
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.
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.
Cooling only unit
1
12
2
4
3
Legend:
Outdoor coil
Compressor
Metering device
Strainer
Vapor valve
Liquid valve
Service pressure port
Indoor unit coil
Liquid distributor
Cooling metering device
Heating metering device
Additional suction
accumulator
R-410A
7
5
14
6
Reversing valve
Crankcase heater
(for 38BCS units only)
Discharge muffler
Gas
Liquid + Gas
Liquid
Check the refrigerant charge
• This check becomes necessary after any refrigerant leak due to
incorrect connection, or after replacement of the compressor.
• The best method to correctly charge refrigerant is to completely
empty the refrigerant circuit using refrigerant recovery
equipment. Then charge the exact quantity of refrigerant
according to the data shown on the unit nameplate. This can be
done with charging equipment of the "Dial a charge" type.
• R-410A refrigerant cylinders contain a dip tube which allows
liquid refrigerant to flow out with the cylinder in a vertical
position with the valve at the top.
Charge R-410A units with the cylinder in a vertical position
and a commercial-type metering device in the manifold hose
in order to vaporize the liquid refrigerant before it enters in
the unit.
Charge refrigerant into the suction-line.
Heat pump unit
9
15
8
1
2
4
11
10
9
15
1
2
4
11
10
E N G L I S H
13
7
5
12
6
Cooling cycle
13
7
5
12
6
Heating cycle
8
8
GB - 11
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