157650-UIM-B-1105
4
Unitary Products Group
7.
Install refrigerant lines to indoor coil first. (The couplings without
Schrader Valves are to be connected to the indoor coil. See Figure
5).
a.
Form the tubing so it is properly aligned with the connections
on the coil.
b.
Remove plugs and caps from connections.
c.
Check that the rubber seals in connection ends are intact.
d.
Be sure surfaces are clean.
e.
Lubricate the rubber seals with clean refrigerant oil and make
connections.
f.
Thread couplings together by hand to be sure they are not
cross threaded. Tighten coupling so diaphragms are touch-
ing. (Do not puncture diaphragms at this time).
8.
Install refrigerant line to outdoor unit. (The couplings with Schrader
Valves are to be connected to the outdoor unit.
a.
Form the tubing so it is properly aligned with the connections
on the outdoor unit. Insure the Schrader Valves are accessi-
ble.
b.
Check that the rubber seals in connection ends are intact.
c.
Be sure surfaces are clean.
d.
Lubricate the rubber seals with clean refrigerant oil and make
connections.
e.
Thread couplings together by hand to be sure they are not
cross threaded. Tighten coupling so diaphragms are touch-
ing. (Do not puncture diaphragms at this time).
9.
Tightening couplings.
a.
Tighten indoor coil couplings with wrenches; using wrench on
stationary fitting of coupling and liquid line fitting at coil while
nut is being tightened. See Figure 6. Tighten the nut until the
coupling bottoms out.
b.
Then tighten an additional 1/6 turn to complete the knife edge
seal.
c.
Tighten outdoor unit couplings, with wrenches using a
wrench on the stationary fitting of the coupling while nut is
being tightened. Tighten the nut until the coupling bottoms
out.
d.
Then tighten an additional 1/6 turn to complete the knife edge
seal.
10. Check for leaks.
a.
After the line set connections have been made they should
be checked for leaks.
b.
If the valves were kept clean and lubricated per instruction no
leaks should be found.
c.
Use leak detect solution or soap solution for leak testing. An
electronic leak detector is recommended.
REFRIGERANT LINE SUPPORT
Refrigerant lines should be supported in a way that no dips or sags
occur. We recommend four feet between supports. If refrigerant lines
are to be attached to the home structure, care should be taken to elimi-
nate the transmission of vibrations. Attach the refrigerant lines to the
indoor coil first. Remove plugs from the indoor coil, then clean joints to
be brazed. Braze refrigerant lines to the indoor coil. Attach refrigerant
lines to the outdoor unit.
CHARGING AND LEAK TESTING
On systems with or without service valves the refrigerant should be
recovered or recycled in accordance with EPA regulations. In some
cases this may require putting piercing valves on both the high and low
sides of the system.
When recovering refrigerant from a system, with a burnout, follow a
safe procedure due to possible contamination.
Contaminated refrigerant must be recovered and returned to the local
refrigeration supply house for proper disposition.
FIGURE 5: Typical Quick Connect Refrigerant Line Set
FIRST CONNECTION
TO INDOOR COIL
SECOND CONNECTION
TO OUTDOOR COIL
INSULATION
FIGURE 6: Quick Connect Coupling Connections
DO NOT vent refrigerant to the outdoors.
Avoid getting the refrigerant in the eyes or on the skin.
TIGHTEN
BACK UP
BACK UP
TIGHTEN
