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.
Table 4
9
outdoor model indoor model orifice size
HR18D2VAEHB2400VD2M20055
HR24D2VA
EHB2400VD2M20059
HR30D2VA
E HB3600VD2M20-T TXV(36K)
HR36D2VA
E HB3600VD2M20-T TXV(36K)
HR42D1VA
EHB4800VD3M22078
HR48D1VA
EHB4800VD3M22085
HR60D1VA
E HB6000VD1M22-T TXV(60K)
Fixed orifice size
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