Electrical devices checks
Table 5:
Item
number
Safety consideration
1 Repair and maintenance to electrical components must include initial safety checks and
component inspection procedures.
2 If a fault exists that could compromise safety, then do not connect any electrical supply
to the circuit until the fault is satisfactorily dealt with. If the fault cannot be corrected
immediately but it is necessary to continue operation, use an adequate temporary
solution. This must be reported to the owner of the equipment so all parties are advised.
3 Initial safety checks must include:
• Ensure capacitors are discharged: take care to avoid the possibility of sparking.
• Ensure no live electrical components and wiring are exposed while charging,
recovering, or purging the system.
• Ensure there is continuity of earth bonding.
Detection of refrigerant
Table 6:
Item
number
Safety consideration
1 Under no circumstances shall potential sources of ignition be used in the searching for
or detection of refrigerant leaks. Do not use a halide torch or any other detector using a
naked flame.
2 The following leak detection methods are deemed acceptable for all refrigerant systems.
• Electronic leak detectors may be used to detect refrigerant leaks but, in the case
of flammable refrigerants, the sensitivity may not be adequate or may need re-
calibration. Calibrate the detection equipment in a refrigerant-free area. Ensure that
the detector is not a potential source of ignition and is suitable for the refrigerant
used. Set leak detection equipment at a percentage of the LFL of the refrigerant and
calibrate to the refrigerant employed. Ensure the appropriate percentage of gas with
a maximum of 25% is confirmed.
• Leak detection fluids are also suitable for use with most refrigerants but avoid the
use of detergents containing chlorine as the chlorine may react with the refrigerant
and corrode the copper pipework. Examples of leak detection fluids are bubble
method and fluorescent method agents.
3 If a leakage of refrigerant is found that requires brazing, recover all of the refrigerant
from the system or isolate the leakage by means of shut-off valves in a part of the
system remote from the leak. Remove refrigerant according to the Removal and
evacuations section of the outdoor unit's Installation Manual.
Installation Manual: R-454B Outdoor Split-System Air Conditioner12
Johnson Controls Ducted Systems
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