Table - Bard CTHAC181-A Installation Instructions Manual

Step 8. Wrap a wet rag around the copper stub before brazing.
Step 9. Flux the copper tube and insert into the stub. Braze the
joint using an alloy of silver or copper and phosphorus
with a melting temperature above 1,100° F for copper
to copper joints. The phosphorus will act as a flux,
therefore, no flux will be required.
A copper-silver alloy with a high silver content should
be used when iron or steel material is involved in the
joint. These alloys require the use of silver solder flux.
Alloys containing phosphorus should not be used with
iron or steel. Phosphorus reacts with the iron, forming
iron phosphate which is extremely brittle.
CAUTION
1. Brazing alloys with a melting temperature
below 700° F should not be used. 2. Lead-tin
or tin-antimony solders should not be used
due to their low melting point and necessity
for corrosive fluxes.
To further prevent the formation of copper oxide inside
the tubing, dry nitrogen may be purged through the
refrigerant system during brazing.
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Manual 2100-292
WARNING
Never purge or pressurize a system with
oxygen. An explosion and fire will result.
Step 10. After brazing, quench with wet rag to cool the joint and
remove any flux residue.
Step 11. Leak test all connections using an electronic leak
detector or a halide torch.
Step 12. Evacuate suction line, liquid line and indoor unit
through outdoor unit base valves.
Step 13. Open both the suction and liquid base valves to the
fully open position. Refer to section later in installation
instructions for details on setting proper system charge.
Table 5 — Tubing Chart
Basic
Condensing 0 - 20
Unit Model Liquid Suction
CTHAC181 1/4" 5/8"
CTHAC241 3/8" 5/8"
CTHAC301 3/8" 5/8"
CTHAC361 3/8" 5/8"
CTHAC421 3/8" 3/4"
CTHAC481 3/8" 7/8"
CTHAC601 3/8" 7/8"
Refrigerant Line Length (Ft.)
21 - 60 61 - 100
Liquid Suction Liquid
1/4" 5/8" 3/8"
3/8" 3/4" 3/8"
3/8" 3/4" 3/8"
3/8" 3/4" 1/2"
3/8" 7/8" 1/2"
3/8" 7/8" 1/2"
3/8" 7/8" 1/2"
Suction
3/4"
3/4"
3/4"
7/8"
7/8"
1-1/8"
1-1/8"