Lennox International Inc 2SCU13 warranty Refrigerant Metering Device

Refrigerant Line Sets: Installing Vertical Runs (new construction shown)

NOTE: Similar installation practices	Outside Wall
should be used if line set is to be	Wood Block
installed on exterior of outside wall.
	Between Studs

Vapor Line Wrapped with Armaflex

Liquid Line

Outside Wall

IMPORTANT:

Refrigerant lines must not contact structure.

Caulk

IMPORTANT: Refrigerant lines must not contact wall.

Vapor Line Liquid Line

Wire Tie

Inside Wall

Strap

Sleeve

Wire Tie

Wood Block

Wire Tie

Strap

PVC Pipe Fiberglass

Insulation

Sleeve

Figure 8

3.Use silver alloy brazing rods (5% or 6% silver alloy for copper-to-copper brazing or 45% silver alloy for copper-to-brass or copper-to-steel brazing) which are rated for use with HCFC-22 refrigerant.

4.Remove the Schrader core assemblies before brazing to protect them from damage due to extreme heat. Replace the cores when brazing is complete.

5.Wrap a wet cloth around the valve body and copper tube stub to protect them from heat damage during brazing.

6.Braze the line set to the service valve. Quench the joints with water or a wet cloth to prevent heat damage to the valve core and opening port. The tube end must stay bottomed in the fitting during final assembly to ensure proper seating, sealing, and rigidity.

7.Install the factory-supplied fixed orifice (or thermal expansion valve which is sold separately and which is approved for use with HCFC-22 refrigerant) in the liquid line at the indoor coil.

Page 6

Refrigerant Metering Device

2SCU13 units are designed for use with either fixed orifice or TXV systems. Refer to the appropriate following section for information on installing the chosen refrigerant meter- ing device.

Fixed Orifice Systems

2SCU13 units are shipped with a fixed orifice refrigerant metering device. Replace the existing indoor unit fixed orifice with the orifice supplied with this unit. Place the supplied fixed orifice sticker on the indoor cabinet after installation. See Table 3 for the proper fixed orifice size for each unit. In nonstandard applications, the provided fixed orifice may not be appropriately sized.

Install the fixed orifice as shown in Figure 9. Do not twist cap tubes when loosening the seal nut from the orifice housing. Use wrench to back up the distributor.

Expansion Valve Systems

Expansion valves equipped with Chatleff-type fittings are available from the manufacturer. See Table 4 for proper TXV for each unit.

# 48283B006