Carrier 38GL...G - Pump Down and Refrigerant Circuit; Pump-down; Refrigerant Circuit

E - 11
GB - 11
ENGLISH
38GL...G / 38GLS...G / 38YY...G / 38YYS...G
Pump Down and refrigerant circuit
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.
Cooling cycle
Heating cycle
2
11
6
14
16
18
10
15
12
4
7
5
7
17
8
13
1
2
11
6
14
16
18
10
15
12
4
7
5
7
17
8
13
1
Legend:
햲 Outdoor coil
햳 Compressor
햴 Metering device
햵 Strainer
햶 Vapor valve
햷 Liquid valve
햸 Service pressure port
햹 Additional pressure port
햻 Indoor unit coil
햽 Liquid distributor
햾 Cooling metering device
햿 Heating metering device
헀 Additional suction accumulator
헁 Reversing valve
헂 Defrost end thermostat
헃 Crankcase heater
헄 Discharge muffler
Gas
Liquid + Gas
Liquid
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.
Compressor damage may occur if run at a negative suction
pressure.
Cooling only unit
Heat pump system
2
4
5
6
7
7
8
10
3
1
17
18
Refrigerant circuit