HP H2H3, N2H3 manual Service Valves, Brazing Connections Fire Hazard

INSTALLATION INSTRUCTIONS

Figure 7	Liquid Line Filter-Drier
	Installed at Indoor Coil
Filter-Drier	38-1 1-84

F. SERVICE VALVES

Service valves are closed and plugged from the factory. Outdoor units are shipped with a refrigerant charge sealed in the unit. Leave the service valves closed until all other refrigeration system work is complete or the charge will be lost. Leave the plugs in place until line set tubing is ready to be inserted.

Heat pumps require a piston metering device in the liquid service valve for proper heating operation. Piston and retainer are shipped in the piston body of the liquid service valve, temporarily held in place with a plastic cap. Do not remove the plastic cap until line set tubing is ready to be installed.

Refer to Figure 8 and follow these steps for piston installation:

1.Remove plastic cap holding piston and retainer in piston body of liquid service valve.

2.Check that piston size (stamped on side of piston) matches with number listed on unit rating plate. Return piston to piston body of liquid service valve (either direction).

Return retainer to piston body.

NOTE: Small end of retainer fits inside piston body, with O-ring sealing against inside of piston body

3.Find plastic bag taped to unit containing copper adapter tube with brass nut.

4.Install adapter tube against retainer and thread

brass nut onto liquid service valve. Tighten nut finger tight, then wrench additional ½ turn only.

3-phase R-22 Split System Heat Pump

Service valve bodies are brass and suction tube stub is copper.

Figure 8	Liquid Service Valve with Piston
	and Sweat/Flare Adapter Tube

PISTON BODY

LIQUID

SERVICE

VALVE

PISTON

PISTON RETAINER

BRASS NUT

SWEAT/FLARE ADAPTER TUBE

G. BRAZING CONNECTIONS

!WARNING

FIRE HAZARD

Failure to follow this warning could result in per‐ sonal injury, death, and/or property damage.

Refrigerant and oil mixture could ignite and burn as it escapes and contacts brazing torch. Make sure the refrigerant charge is properly removed from both the high and low sides of the system be‐ fore brazing any component or lines.

Clean line set tube ends with emery cloth or steel brush. Remove any grit or debris.

Insert line set tube ends into service valve tube stubs.

Apply heat absorbing paste or heat sink product between service valve and joint. Wrap service valves with a heat sinking material such as a wet cloth.

Braze joints using a Sil-Fos or Phos-copper alloy.

!CAUTION

PRODUCT DAMAGE HAZARD

Failure to follow this caution may result in product damage.

Braze with Sil-Fos or Phos-copper alloy on cop‐ per-to-copper joints and wrap a wet cloth around rear of fitting to prevent damage to TXV.

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