507043-01
Issue 1222
Page 4 of 8
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 m ore) in an attic will require insulation. Route
refrigeration line sets to m inim ize length.
DO NOT let refrigerant lines com e in direct contact with
foundation. W hen running refrigerant lines through the
foundation or wall, openings should allow for a sound and
vibration absorbing m aterial to be placed or installed
between tubing and foundation. Any gap between
foundation or wall and refrigerant lines should be filled with
a vibration dam ping m aterial.
Before m aking 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 form ation on the inside of the tubing.
The following is the recom m ended m ethod for m aking
braze connections at the refrigerant line connections:
1.
Debur and clean refrigerant tube end with em ery
cloth or steel brush.
2.
Insert tubing into swage fitting connection.
3.
W rap 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 m ust be checked for
leaks after brazing and before evacuation. The
recom m ended procedure is to apply a trace am ount of
vapor refrigerant (approxim ately 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 m ay also be checked for leaks using a
halide torch or pressure and soapy solution. After
com pletion of leak check, relieve all pressure from system
before evacuation.
Evacuating And Charging Instructions
These outdoor units are pre-charged at the factory with
adequate refrigerant to handle
15 feet
of refrigerant tubing.
1.
Connect the vacuum pum p to the center hose of the
m anifold gauge set, the low-pressure m anifold
gauge to the vapor service valve and the high
pressure m anifold gauge to the liquid service valve.
2.
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.
3.
Follow the vacuum pum p m anufacturer's
instructions. Allow the pum p to operate until the
system has been evacuated down to 300 m icrons.
Allow the pum p to continue running for an additional
15 m inutes. Turn OFF the pum p and leave the
connections secured to the two (2) service valves.
After 5 m inutes, if the system fails to hold 1000
m icrons or less, check all connections for tight fit and
repeat the evacuation procedure.
4.
Isolate the vacuum pum p from the system by closing
the shutoff valves on the gauge-set. Disconnect the
vacuum pum p.
5.
After evacuation of the connecting lines, rem ove 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.
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.
It is unlawful to release refrigerants into the
atm osphere.
If ANY refrigerant tubing is buried, provide a 6 inch
vertical rise at service valve. Refrigerant tubing
lengths up to 36 inches m ay be buried without further
special consideration. For lengths above 36 inches,
consult your local distributor.
