Stulz CeilAir CW - Field Service; Leak Detection; Leak Repair; Refrigerant Piping

75OCH0006F08/13/2024
CEILAIR
®
CW & DX IOM
4.3.4.1 COMPRESSOR FAILURE
4.3 Field Service
It may be necessary to perform repairs on the refrigeration system. If field repairs are necessary, the following
procedures apply:
NOTE Use Proper Tools
Do not attempt to make repairs without the proper tools.
WARNING
If refrigerant gas is released in an enclosed area, it will displace oxygen and potentially suffocate those
nearby. Always ensure adequate ventilation during refrigeration repairs.
WARNING
Always recover all refrigerant prior to any system repairs. Failure to do so may result in system over
pressurization and rupture. Follow the guidelines in "Recovering Refrigerant" in section 3.4.1.
4.3.1 Leak Detection
Several methods can be used to detect a leak in the refrigeration system. The most modern and easiest
method is to use an electronic leak detector. Follow the manufacturer’s directions and any leak can be quickly
located. A second method is to use soap bubbles. Apply a solution of soapy water with a brush or sponge to
the joints and connections in the refrigeration lines. A leak in the lines will cause bubbles to form.
4.3.2 Leak Repair
When a leak is located, properly reclaim the remaining refrigerant charge before beginning repairs. Adjacent
piping must be thoroughly cleaned by removing all paint, dirt, and oily film. Use a wire brush, sandcloth, or
sandpaper and wipe the area with clean, dry cloths. Protect nearby parts from heat damage by wrapping
them with water-soaked cloths.
4.3.3 Refrigerant Piping
When replacing components within the cabinet of the unit the following consumable materials are
recommended. Use SILFOS alloy solder for copper-to-copper repairs (e.g., the piping discharge or suction
line). Use brazing flux (Stay-Silv #45) with 45% silver brazing solder on brass-to-copper (e.g., Schrader
valves), on copper-to-steel, and on steel-to-steel repairs.
When component replacement is complete, remove all traces of flux. After any repair, pressure check the
system for leaks prior to recharging the system.
4.3.4 General Common Repairs/Component Replacement
4.3.4.1 Compressor Failure
The compressor is the most important component of the air conditioner. Numerous safety devices are
provided to protect the compressor from failing.