Installation Of Line Sets; Evacuating And Charging; Leak Check; Evacuating & Charging - Allied Air 2HP13 Installation Manual

Recommended Liquid & Vapor Tube Diameters (In.)
LIQUID
Unit Size
Connection Dia. Tube Dia. Connection Dia. Tube Dia.
018 3/8"
024 3/8"
030 3/8"
036 3/8"
042 3/8"
048 3/8"
060 3/8"
*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.
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.
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.
100402-07
VAPOR
3/8" 3/4 3/4
3/8" 3/4 3/4
3/8" 3/4 3/4
3/8" 3/4 3/4
3/8" 7/8 7/8
3/8" 7/8 7/8
3/8" 7/8 *1-1/8
Use an insulated or
Any gap between
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.
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.
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