Installation manual

GB - 11
38GL...G9 / 38YY...G9 / 38YYS...G9
ENGLISH
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Gas
Liquid + Gas
Liquid
Legend:
햲 Outdoor coil
햳 Compressor
햴 Expansion device
햵 Strainer
햶 Vapor valve
햷 Liquid valve
햸 Service pressure port
햹 Additional pressure port
햺 Indoor unit coil
햻 Liquid distributor
햽 Cooling expansion device
햾 Heating expansion device
햿 Additional suction accumulator
헀 Reversing valve
헁 Defrost end thermostat
헂 Crankcase heater
헃 Discharge muffler
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.
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 and always considering the
additional charges shown in table “System charge”.
• R-410A systems must be charged with liquid refrigerant.
Charge R-410A units using a commercial-type metering device
applied to the manifold hose in order to vaporize the liquid
refrigerant before it enters the unit.
Cooling cycle
Heating cycle
Cooling only unit
Heat pump system