This task covers:
Refrigeration Unit Service Tool Kit
General Safety Instructions
The polyurethane foam used as insulation in the air
conditioner will break down to form toxic gases if
exposed to the flame of a torch or brazing temperature.
Never use a heating torch on any part that contains
refrigerant. Heat causes the refrigerant to break down
and form carbonyl chloride (phosgene), a highly toxic
and corrosive gas. All refrigerant must be discharged
from the system and the entire system must be purged
with dry nitrogen before beginning any debrazing
1. Be sure the work area is well ventilated and that dry nitrogen is flowing through the refrigeration system at a
rate of 1 - 2 cfm (0.028 - 0.057 m3/minute). (See para 5-11.)
The polyurethane foam used as insulation in the air conditioner will break down to form
toxic gases if exposed to the flame of a torch or brazing temperature.
2. Protect insulation, wiring harnesses, and other components with appropriate shields.