035-15713-003 REV. A (0500)
8
Unitary Products Group
5.
Slope tubing toward outdoor unit
a.
When the coil is above the outdoor unit, the suction
line should be sloped with a fall of a least 1/4" per
foot toward the outdoor unit.
b.
When the outdoor unit is above the coil, the tubing
should be sloped downward along lateral distance
to the bottom, or from the vertical riser.
6.
Insulation of suction line.
a.
Standard suction lines come pre-insulated from the
factory with 3/8" closed cell insulation, adequate for
average installations.
NOTE:
In regions of extreme temperatures and humidity,
additional insulation may be required to prevent
excessive condensation and serious loss of capac-
ity.
b.
Do not insulate liquid and suction lines together.
c.
Liquid lines should not be insulated.
d.
Liquid lines should not be in bare contact with suc-
tion line. See Figure 3.
7.
Install refrigerant lines to indoor coil first. (The couplings
without Schrader Valves are to be connected to the
indoor coil. See Figure 9).
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 dia-
phragms are touching. (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 accessible.
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 dia-
phragms are touching. (Do not puncture diaphragms
at this time).
FIGURE 7 :
EXCESS TUBING
Liquid refrigerant under pressure. Liquid refrigerant
can cause severe frostbite. To avoid possible loss of
sight and/or frostbite use eye protection (safety
glasses or safety face shield). Wearing leather
gloves will offer protection to hands.
FIGURE 8 :
TYPICAL QUICK CONNECT
REFRIGERANT LINE SET
