ECR EMI America Series Installation, Operation And Maintenance Manual page 16

Refrigerant piping
1. Clean the ends of tubing and insert into
fittings (Figure 15).
2. Before brazing (
a. Protect valves by wrapping with a wet
rag "heat sink" before brazing.
b. Use a shield to protect the paint as
shown. (The shield can be made from
scrap metal.)
3. Braze tubing into fittings, using a continu-
ous nitrogen purge.
4. The suction line must be insulated the
entire length with closed cell, foam tube
insulation.
5. Do not insulate the liquid line.
6. Connect the outdoor unit according to
the instructions supplied with unit.
NOTICE
1. Maximum equivalent pipe run should
comply with Table 1, Page 8.
2. Horizontal pipe runs should be
slightly inclined, so as to encourage
oil to flow in the direction of the
compressor, for better oil return.
3. Good refrigeration practices must be
employed to ensure the correct pres-
sure drop and good oil return.
Pressure test
evacuate the tubing and indoor unit to 500 microns or less, with service valves remaining
front seated (closed).
Comfort where it counts
• Installation, Operation and Maintenance Manual •
Refrigerant Piping
Figure 16):
all field installed piping with nitrogen. Using a suitable vacuum pump,
CACG/CAHG & CACH/CAHH
(continued)
Figure 15
Figure 16
Wet rag heat sink
CAUTION
16
Air Handlers
Clean ends of tubing
Place wet rag "heat shield over
valves plus a sheet metal shield
to protect paint
P/N 240007756, Rev. A [051509]
shield