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1.Tubing should be cut square. Make sure it is round and free of burrs at the connecting ends.
Clean the tubing to prevent contamination from entering the system.
2.Make sure that both refrigerant stop valves at the outdoor unit are closed.
3.Push the tubing into the fitting until it stops. This prevents flux from getting into the system.
4.Remove the cap and Schrader valve core from the service port to protect the valve seals.
5.Wrap a wet rag around the valve stub before brazing.
6.Braze the joints of interconnecting tubing. Flow dry nitrogen into the shutoff valve port
and through the tubing while brazing.
7.After brazing quench with a wet rag to cool the joint. Reinstall the Schrader core in the valve,
if removed for brazing.
8.Pressurize the lines to 150 psi maximum with dry nitrogen. Check for leaks at all joints with
liquid detergent. If a leak is found, repair it after removing the nitrogen. Repeat the process
and re-ckeck.
9.Do not purge the lines with refrigerant. Evacuate the lines and indoor coil.
Refrigerant Metering Devices
Replace the existing indoor unit fixed orifice with the orifice supplied with the outdoor unit.
See table 4 for the fixed orifice size for each unit.
Fixed orifice size
outdoor model
orifice size
indoor model
078
071
062
057
083
HC18D2
VAR
HC42D2
VAR
HC36D2
VAR
HC30D2
VAR
HC24D2
VAR
HB2400VD1M20
HB4800VD1M22
HB3600VD1M22
HB2400VD1M20
HB3600VD1M22
8
Table 4