Goodman Mfg CONDENSING AC UNIT SINGLE / THREE PHASE AIR CONDITIONERS, IO-402G Suct Liq

WARNING

To avoid possible explosion, use only returnable (not disposable) service cylinders when removing refrig- erant from a system.

•Ensure the cylinder is free of damage which could lead to a leak or explosion.

•Ensure the hydrostatic test date does not exceed 5 years.

•Ensure the pressure rating meets or exceeds 400 lbs.

When in doubt, do not use cylinder.

Refrigerant Lines

NOTE: For improved refrigerant management, equip the evaporator coil with a field-supplied thermal expansion valve (TXV) and the liquid line with a field-supplied liquid line solenoid. Ensure the solenoid is installed as close as possible to the evaporator coil to prevent refrigeration migration in the compressor “OFF” cycle.

Use only refrigerant grade (dehydrated and sealed) copper tub- ing to connect the condensing unit with the indoor evaporator. After cutting the tubing, install plugs to keep refrigerant tubing clean and dry prior to and during installation. Tubing should always be cut square keeping ends round and free from burrs. Clean the tubing to prevent contamination.

Do NOT let refrigerant lines come in direct contact with plumb- ing, ductwork, floor joists, wall studs, floors, and walls. When running refrigerant lines through a foundation or wall, openings should allow for 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 pliable silicon-based caulk, RTV or a vibration damping material. Avoid suspending refrigerant tubing from joists and studs with rigid wire or straps that would come in contact with the tubing. Use an insulated or suspension type hanger. Keep both lines separate and always insulate the suction line.

Cond Unit	REFRIGERANT LINE LENGTH (ft)
	0-24		25-49*		50-74**
(Tons)		Line	Diameter (In.		OD)
	Suct	Liq	Suct	Liq	Suct	Liq
7 1/2	1 1/8	5/8	1 3/8	5/8	1 3/8	5/8
10	1 3/8	5/8	1 5/8	5/8	1 5/8	5/8

*Full rating line size

**Lines greater than 74 feet in length or vertical elevation changes more than 50 feet refer to the Remote Cooling

Service Manual or contact your distributor for assistance.

Insulation is necessary to prevent condensation from forming and dropping from the suction line. Armflex (or satisfactory equivalent) with 3/8” min. wall thickness is recommended. In severe conditions (hot, high humidity areas) 1/2” insulation may be required. Insulation must be installed in a manner which protects tubing from damage and contamination.

Where possible, drain as much residual compressor oil from existing systems, lines, and traps; pay close attention to low areas where oil may collect. NOTE: If changing refrigerant types, ensure the indoor coil and metering device is compat- ible with the type of refrigerant being used; otherwise, the in- door coil must be replaced. To facilitate oil return to the com- pressor, a horizontal suction line should be pitched (1/2” per 10’ toward the condensing unit.

Filter Drier and Sight Glass

A liquid line filter drier is factory installed. Field-install the sup- plied sight glass/moisture indicator on the liquid line as close as practical to the service valve.

Burying Refrigerant Lines

If burying refrigerant lines can not be avoided, use the following checklist.

1.Insulate liquid and suction lines separately.

2.Enclose all underground portions of the refrigerant lines in waterproof material (conduit or pipe) sealing the ends where tubing enters/exits the enclosure.

3.If the lines must pass under or through a concrete slab, ensure lines are adequately protected and sealed.

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