Blueridge BHP15 Installation Instructions Manual - Page 4

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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.

Insert tubing into swage fitting connection.

Wrap wet rags over valves to protect from heat.

Allow dry nitrogen to flow through refrigerant lines.

Braze joint, using a suitable brazing alloy for copper to

copper joints.

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.

Page 4 of 11

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.

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

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

Replace service valve cap and torque to 8-11 ft-lb on

3/8" valves; 12-15 ft-lb on 3/4" valves; 15-20 ft-lb on 7/8"

valves. Use backup wrench on valve body when torquing

valve cap.

Install Electrical Accessories

Refer to the instructions packaged with the accessories.

Issue 1850

506318-03B