Ducane (HVAC) 2HP13 warranty Recommended Liquid & Vapor Tube Diameters, Installation of Line Sets

Recommended Liquid & Vapor Tube Diameters (In.)

Unit Size		LIQUID		VAPOR
	Connection Dia.		Tube Dia.	Connection Dia.	Tube Dia.
018	3/8"		3/8"	3/4	3/4
024	3/8"		3/8"	3/4	3/4
030	3/8"		3/8"	3/4	3/4
036	3/8"		3/8"	3/4	3/4
042	3/8"		3/8"	7/8	7/8
048	3/8"		3/8"	7/8	7/8
060	3/8"		3/8"	7/8	*1-1/8

*FIELD SUPPLIED 7/8 X 1-1/8 CONNECTOR REQUIRED ON BOTH ENDS OF VAPOR TUBING.

It is important that no tubing be cut or seals broken until you are ready to actually make connections to the evaporator and to the condenser section. DO NOT remove rubber plugs or copper caps from the tube ends until ready to make connections at evaporator and condenser. Under no circumstances leave the lines open to the atmosphere for any period of time, if so unit requires additional evacuation to remove moisture.

Be extra careful with sharp bends. Tubing can "kink" very easily, and if this occurs, the entire tube length will have to be replaced. Extra care at this time will eliminate future service problems.

It is recommended that vertical suction risers not be up-sized. Proper oil return to the compressor should be maintained with suction gas velocity.

Installation of Line Sets

DO NOT fasten liquid or suction lines in direct contact with the floor or ceiling joist. Use an insulated or suspension type of hanger. Keep both lines separate, and always insulate the suction line. Long liquid line runs (30 feet or more) in an attic will require insulation. Route refrigeration line sets to minimize length.

DO NOT let refrigerant lines come in direct contact with foundation. When running refrigerant lines through the foundation or wall, openings should allow for a sound and vibration absorbing material to be placed or installed between tubing and foundation. Any gap between foundation or wall and refrigerant lines should be filled with a vibration damping material.

If ANY refrigerant tubing is buried, provide a 6 inch vertical rise at service valve. Refrigerant tubing lengths up to 36 inches may be buried without further special consideration. For lengths above 36 inches, consult your local distributor.

Before making braze connections, be sure all joints are clean. Before heat is applied for brazing, dry nitrogen should be flowing through the tubing to prevent oxidation and scale formation on the inside of the tubing.

The following is the recommended method for making braze connections at the refrigerant line connections:

1.Debur and clean refrigerant tube end with emery cloth or steel brush.

2.Insert tubing into swage fitting connection.

3.Wrap wet rags over valves to protect from heat.

4.Allow dry nitrogen to flow through refrigerant lines.

5.Braze joint, using a suitable brazing alloy for copper to copper joints.

6.Quench the joint and tubing with water using a wet rag. Leave rag on fitting body and re-wet with water to help cool area.

Leak Check

Refrigeration lines and indoor coil must be checked for leaks after brazing and before evacuation. The recommended procedure is to apply a trace amount of vapor refrigerant (approximately two ounces or 3 psig) into the line set and indoor coil, then pressurize with 150 psig of dry nitrogen. Use a refrigerant leak detector to check all joints. The system may also be checked for leaks using a halide torch or pressure and soapy solution. After completion of leak check, relieve all pressure from system before evacuation.

Evacuating And Charging Instructions

NOTE: Intentional release of CFC or HCFC refrigerant to the atmosphere violates Federal Law. It may also violate State and Local Codes. Check all Federal, State and Local Codes before proceeding.

These outdoor units are pre-charged at the factory with adequate refrigerant to handle 15 feet of refrigerant tubing.

NOTE: DO NOT use any portion of the charge for purging or leak testing. It is mandatory that a thorough evacuation of the refrigeration lines and indoor coil be performed.

The liquid line and suction line service valves have been closed after final testing at the factory. DO NOT disturb these valves until the lines have been leak checked and evacuated or the charge in the unit may be lost.

1.Connect the vacuum pump to the center hose of the manifold gauge set, the low-pressure manifold gauge to the vapor service valve and the high pressure manifold gauge to the liquid service valve.

NOTE: Unnecessary switching of hoses can be avoided and complete evacuation of all lines can be achieved by also connecting a branch hose from the manifold gauge center port to a cylinder of R-

22.Provide a separate shut-off valve to vacuum pump to avoid contaminating vacuum pump oil with refrigerant.

100402-07 Issue 0733 Page 4 of 18