Pump Down And Check The Refrigerant Charge - Carrier 38GL2M12G Installation Manual

38GL_M...G / 38YY(S)_M...G

Pump Down and check the refrigerant charge

38GL2M12G
38GL3M21G - 38GL3M30G
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.
Refrigerant charge control
Outdoor unit
Circuit A compressor
Circuit B compressor
Outdoor unit coil
Filter
Expansion device (Capillary)
Expansion device (Accurater)
Distributor
Solenoid valve
Service valve
Indoor unit coil A1
Indoor unit coil A2
Indoor unit coil B1
Indoor unit coilB2
Indoor unit coil A
Indoor unit coil B
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, using a balance
(see page 8).
• R-410A refrigerant cylinders contain a dip tube which allows
liquid refrigerant to flow from the cylinder in an upright
position.
Charge R-410A units with cylinder in upright position and a
commercial-type metering device in manifold hose in order to
vaporize the liquid refrigerant before it enters in the unit.
Charge refrigerant into suction-line.
38GL2M18G - 38GL2M24G - 38GL2M36G - 38GL2M48G
E N G L I S H
Gas
Liquid + Gas
Liquid
GB - 17