Dehumidifier 50, 35, 22 Pint · Important Safety Instructions · 9
7. Repair To Intrinsically Safe Components
Do not apply any permanent inductive or capacitive loads to the circuit without ensuring
that this will not exceed the permissible voltage and current for the unit in use. Intrinsically
safe components are the only types that can be worked on while live and in the presence
of a ammable atmosphere. The test apparatus shall be at the correct rating. Replace the
components only with parts specied by the manufacturer. Other parts may result in the
ignition of refrigerant in the atmosphere from a leak.
8. Cabling
Check that the cabling will not be subject to wear, corrosion, excessive pressure, vibration,
sharp edges, or any other adverse environmental effects. The check shall also consider the
effects of aging or continual vibration from sources such as compressors or fans.
9. Detection Of Flammable Refrigerants
Under no circumstances shall potential sources of ignition be used in searching for or
detecting refrigerant leaks. A halide torch (or any other detector using a naked ame) shall
not be used.
10. Leak Detection Methods
The following leak detection methods are deemed acceptable for systems containing
ammable refrigerants. Electronic leak detectors shall be used to detect ammable
refrigerants, but the sensitivity may not be adequate, or may need re-calibration.
(Detection equipment shall be calibrated in a refrigerant-free area.) Ensure that the
detector is not a potential source of ignition and is suitable for the refrigerant used. Leak
detection equipment shall be set at a percentage of the LFL of the refrigerant and shall
be calibrated to the refrigerant employed and the appropriate percentage of gas (25%
maximum) is conrmed. Leak detection uids are suitable for use with most refrigerants,
but the use of detergents containing chlorine shall be avoided as the chlorine may react
with the refrigerant and corrode the copper pipework. If a leak is suspected, all naked
ames shall be removed / extinguished. If a refrigerant leak is found (which requires
brazing), all refrigerants shall be recovered from the system, or isolated (by means of
shut off valves) in a part of the system that is situated remotely from the leak. Removal of
refrigerant shall be according to Removal and evacuation.
11. Removal And Evacuation
When breaking into the refrigerant circuit to make repairs or for any other purpose,
conventional procedures shall be used. Considering ammability, follow best practices.
Adherence to the following procedures is a must:
a. Removing the refrigerant following local and national regulations;
b. Purging the circuit with inert gas;
c. Evacuation;
d. Purging again with inert gas;
e. Opening the circuit by cutting or brazing;
f. The refrigerant charge shall be recovered into the correct recovery cylinders if
venting is not allowed by local and national codes. For appliances containing
ammable refrigerants, the system shall be purged with oxygen-free nitrogen to
NOTE: The use of silicon sealant may inhibit the effectiveness of some types
of leak detection equipment. Intrinsically safe components do not have to be
isolated prior to working on them.
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