Heat Pump - Carrier 38YY...G Installation Manual

38YY...G / 38YYS...G
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.
Compressor damage may occur if run at a negative suction
pressure.
Cooling cycle
15
11
18
14
2
16
4
13 12
8
Legend:
Outdoor coil
Compressor
Metering device
Strainer
Vapor valve
Liquid valve
Service pressure port
Additional pressure port
Indoor unit coil
R-410A
Refrigerant charge control
heat pump unit
Te Ta
5
7
17
6
7
Liquid distributor
Cooling metering device
Heating metering device
Additional suction
accumulator
Reversing valve
Defrost end thermostat
Crankcase heater
Discharge muffler
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.
11
10
18
1
2
16
4
13 12
8
E N G L I S H
Heating cycle
15
7 5
14
Ti
17
6
7
Gas
Liquid + Gas
Liquid
10
GB - 11