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.
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. Contact your
distributor technical service for line sets longer than 50 feet
or with more than 20 feet vertically between the indoor and
outdoor unit.
On applications where liquid floodback to the compressor
may occur, a suction line accumulator is recommended.
Please note accumulators are factory installed in heat
pumps, if required. Contact your distributor technical
service for further information.
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 pliable silicon-based caulk, RTV or a vibration damping
material.
Service Valve Type
The outdoor condensing unit is supplied with sweat brass
service valves with copper stubs. All service valves are
positioned to seal refrigerant in the unit with gauge ports
open to connecting lines. Gauge ports have Schraeder
valve core installed and require use of charging hoses with
depressors. DO NOT heat valve body above 250 degrees
F. Service valves must be wrapped with wet rags or
otherwise protected from heat during brazing. Use care to
ensure no moisture enters valves or Schraeder valve cores
if wet rags are used.
Brazing Connections
WARNING
FIRE HAZARD!
Refrigerant and oil mixture under pressure
could ignite as it escapes and contacts brazing
torch resulting in FIRE. Make sure the
refrigerant charge is properly removed from
both the high and low sides of the system
before brazing any component or lines.
FAILURE TO DO SO COULD RESULT IN
BODILY INJURY OR DEATH.
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.
Apply heat absorbing paste or heat sink product to
prevent damage to the service valve.
4.
Braze joint, using a suitable brazing alloy for copper
to copper joints.
5.
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 condensing units are pre-charged at the factory
with adequate refrigerant to handle 15 feet of refrigerant
tubing.
20407502
ISSUE 0144
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