Hayward S.Line Pro Fi 25kW Installation & Operation Manual page 44

6. MAINTENANCE AND INSPECTION MAINTENANCE AND INSPECTION
Repairs to sealed components
1) During repairs to sealed components, all electrical supplies shall be disconnected from
the equipment being worked upon prior to any removal of sealed covers, etc. If it
isabsolutely necessary to have an electrical supply to equipment during servicing, then a
permanently operating form of leak detection shall be located at the most critical point to
warn of a potentially hazardous situation.
2) Particular attention shall be paid to the following to ensure that by working on electrical
components, the casing is not altered in such a way that the level of protection is affected.
This shall include damage to cables, excessive number of connections, terminals not made
to original specification, damage to seals, incorrect fitting of glands, etc.
Ensure that apparatus is mounted securely.
Ensure that seals or sealing materials have not degraded such that they no longer serve
the purpose of preventing the ingress of flammable atmospheres. Replacement parts shall
be in accordance with the manufacturer's specifications.
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
Repair to intrinsically safe components Repair to intrinsically safe components
Do not apply any permanent inductive or capacitance loads to the circuit without ensuring Do not apply any permanent inductive or capacitance loads to the circuit without ensuring
that this will not exceed the permissible voltage and current permitted for the equipment in that this will not exceed the permissible voltage and current permitted for the equipment in
use. use.
Intrinsically safe components are the only types that can be worked on while live in the Intrinsically safe components are the only types that can be worked on while live in the
presence of a flammable atmosphere. The test apparatus shall be at the correct rating. presence of a flammable atmosphere. The test apparatus shall be at the correct rating.
Replace components only with parts specified by the manufacturer. Other parts may result Replace components only with parts specified by the manufacturer. Other parts may result
in the ignition of refrigerant in the atmosphere from a leak. in the ignition of refrigerant in the atmosphere from a leak.
Cabling Cabling
Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration,
sharp edges or any other adverse environmental effects. The check shall also take into sharp edges or any other adverse environmental effects. The check shall also take into
account the effects of aging or continual vibration from sources such as compressors or account the effects of aging or continual vibration from sources such as compressors or
fans. fans.
Detection of flammable refrigerants Detection of flammable refrigerants
Under no circumstances shall potential sources of ignition be used in the searching for or Under no circumstances shall potential sources of ignition be used in the searching for or
detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) detection of refrigerant leaks. A halide torch (or any other detector using a naked flame)
shall not be used. shall not be used.
Leak detection methods Leak detection methods
The following leak detection methods are deemed acceptable for systems containing The following leak detection methods are deemed acceptable for systems containing
flammable refrigerants. flammable refrigerants.
Electronic leak detectors shall be used to detect flammable refrigerants, but the sensitivity Electronic leak detectors shall be used to detect flammable refrigerants, but the sensitivity
may not be adequate, or may need re-calibration. (Detection equipment shall be calibrated 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 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 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 of the LFL of the refrigerant and shall be calibrated to the refrigerant employed and the
appropriate percentage of gas (25 % maximum) is confirmed. appropriate percentage of gas (25 % maximum) is confirmed.
Leak detection fluids are suitable for use with most refrigerants but the use of detergents Leak detection fluids 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 containing chlorine shall be avoided as the chlorine may react with the refrigerant and
corrode the copper pipe-work. corrode the copper pipe-work.
If a leak is suspected, all naked flames shall be removed/ extinguished. If a leak is suspected, all naked flames shall be removed/ extinguished.
If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be
recovered from the system, or isolated (by means of shut off valves) in a part of the system recovered from the system, or isolated (by means of shut off valves) in a part of the system
remote from the leak. Oxygen free nitrogen (OFN) shall then be purged through the system remote from the leak. Oxygen free nitrogen (OFN) shall then be purged through the system
both before and during the brazing process. both before and during the brazing process.
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