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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.

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.

Page 4 of 17

CAUTION

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 the proper refrigerant. Provide a

separate shut-off valve to vacuum pump to avoid

contaminating vacuum pump oil with refrigerant.

The valves should be kept in the "front seated"

(closed) position. This will allow evacuation of the

refrigeration lines and the indoor coil, without disturbing the

factory charge in the outdoor unit.

Follow the vacuum pump manufacturer 's

instructions. Allow the pump to operate until the system

has been evacuated down to 300 microns. Allow the pump

to continue running for an additional 15 minutes. Turn OFF

the pump and leave the connections secured to the two (2)

service valves. After 5 minutes, if the system fails to hold

500 microns or less, check all connections for tight fit and

repeat the evacuation procedure.

4. Isolate the vacuum pump from the system by

closing the shutoff valves on the gauge-set. Disconnect

the vacuum pump.

Opening Service Valves

After evacuation of the connecting lines, remove the

The

service valve cap and fully insert the hex wrench into the

stem. A back-up wrench is required on the valve body to

open the valve stem. Back-out counterclockwise until the

valve stem just touches the coined edge.

Wrench sizes:

3/8 service valve: 3/16" Hex wrench

3/4 service valve: 5/16" Hex wrench

7/8 service valve: 5/16" Hex wrench

Issue 0946

506318-01