Figure 4-35. Expansion Valve
REFRIGERANT UNDER PRESSURE
is used in the operation of this equipment
or severe injury may result if you fail to observe safety precautions.
Never use a heating torch on any part that contains Refrigerant 22.
Do not let liquid refrigerant touch you, and do not inhale refrigerant gas.
(1) Be sure refrigerant has been discharged. (See paragraph 4-5.)
(2) Tubing should be nitrogen purged during all brazing/debrazing operations. (See paragraph 4-6.)
(3) Unwrap insulation tape (black cork tape) from joints that are to be debrazed and from the sensing bulb.
(4) Loosen the screws and nuts in the bulb straps that attach the sensing bulb to the suction line, and pull the
bulb out of the straps. Take care to note the position (center top of suction line) of the bulb.
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