CACG/CAHG/CAHJ & CACH/CAHH/CAHK
Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
16
P/N 240008108, Rev. G [07/08/10]
Refrigerant Piping
(continued)
Clean ends of tubing
Figure 15
Place wet rag “heat shield over
Figure 16
valves plus a sheet metal shield
to protect paint
Wet rag heat sink
Shield
Refrigerant piping
Clean the ends of tubing and insert into
1.
fi tt ings ( Figure 15 ).
Before brazing (
2. Figure
16
):
Protect valves by wrapping with a wet
a.
rag “heat sink” before brazing.
Use a shield to protect the paint as
b.
shown. (Th
e shield can be made from
scrap metal.)
Braze tubing into fi tt ings, using a continu-
3.
ous nitrogen purge.
Th
e suction line must be insulated the
4.
entire length with closed cell, foam tube
insulation.
Do not insulate the liquid line.
5.
Connect the outdoor unit according to
6.
the instructions supplied with unit.
NOTICE
Maximum equivalent pipe run should
1.
comply with ( Table 1, Page 8 ).
Horizontal pipe runs should be
2.
slightly inclined, so as to encourage
oil to flow in the direction of the
compressor, for bett er oil return.
Good refrigeration practices must be
3.
employed to ensure the correct pres-
sure drop and good oil return.
CAUTION
Pressure test
all fi eld installed piping with nitrogen. Using a suitable vacuum pump,
evacuate the tubing and indoor unit to 500 microns or less, with service valves remaining
front seated (closed).