Air Purging - Carrier 42PQV Installation Manual

42PQV/38VBH
Refrigerant connections

Air purging

Use only a vacuum pump to purge air from the piping.
NEVER use the system compressor as a vacuum pump.
NEVER use the unit refrigerant gas to purge the connecting
pipes.
No additional refrigerant has been provided in the unit for this
purpose.
Remove the caps from the three-way valves.
Create a vacuum with a vacuum pump connected to the service
connection of the suction shut-off valve (gas), as shown, keeping
the shut-off valves completely shut until a 50 Pa (0.5 mbar)
vacuum has been reached.
Now open the liquid valve for 3 seconds, then quickly shut it to
check for possible leaks.
After the leak check, fully open the three-way valves.
Replace caps and check for leaks.
Once all connections have been completed, check for leaks by
using a leak detector specific for HFC refrigerants.
GB - 12
Three-way valve (liquid)
Needle valve
Valve cap
Valve needle
Allen (hex. head) wrench
Three-way valve (liquid)
Tube
Tube insulation
Fastening tape
Once all connections have been completed, check for leaks by
applying soapy water to them.
Finally wrap connections with anti-condensate insulation and
tighten with tape, without exerting great pressure on the insulation.
Repair and cover any possible cracks in the insulation.
Connection pipes and electric cables between indoor and outdoor
units must be fixed to the wall with appropriate conduits.
z
Flare nut
Liquid line (small diameter)
Gas line (large diameter)
Indoor unit
Outdoor unit
Vacuum pump
Pipe
Pipe insulation
Fastening tape