Emerson COPELAND H Series User Manual page 16

e. Electrical
- All electrical work must be done in accordance with the National Electrical
Code and existing local codes.
- Power supply must be the same as specified on the unit's name plate.
- Voltage fluctuations in excess of 10 percent must be corrected.
- Before starting the unit, ensure that all protective devices are in place and
that all wiring is secure.
f. Brazing Recommendation
Maintain a flow of oxygen-free nitrogen through the system at a very low pressure
during brazing. Nitrogen displaces the air and prevents the formation of copper
oxides in the system. If copper oxidization is allowed to form, the copper oxide
material can later be swept through the system and block screens such as those
protecting capillary tubes, thermal expansion valves, and accumulator oil return
holes. This minimizes any entry of contaminants and moisture.
- Remove the liquid line connection cap.
- Then remove the suction connection cap.
- Open both valves midway.
- Care should be taken to avoid the holding charge from releasing too quickly.
- Be sure tube fitting inner diameter and tube outer diameter are clean prior to
assembly.
- Since both tubes are extended from the condensing unit housing, we
recommend insulating the housing by using a wet cloth on the copper tubing.
- Recommended brazing materials: a copper / phosphorous or copper /
phosphorous / silver alloy rod should be used for joining copper to copper
whereas to join dissimilar or ferric metals, use a silver alloy rod, either flux
coated or with a separate.
- Use a double tip torch.
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