- 15 -
NO
NO
7
7
Testing Air Tightness
There are no changes from the conventional method. Note that a refrigerant leak detector for R22 will not work
for R407C.
<Items to be strictly observed>
1. Pressurize the equipment with nitrogen up to the design pressure, and then measure the equipment’s air-tight-
ness, taking temperature variations into account.
2. When investigating locations of leaks using a refrigerant, be sure to use R407C.
3. Make sure that R407C is in a liquid state when charging the circuit.
<Rationale>
1. Use of oxygen to pressurize the equipment may cause an explosion.
2. If gas refrigerant is used, the composition of the remaining refrigerant in the cylinder will change and become
unusable.
<Caution>
A leak detector for R407C is commercially available, and it should be acquired.
Halide Torch
R22 Leak Detector
