40
A Series Inverter Modular Air-cooled Chiller (Heat Pump)
■ Checks on electrical devices
Repair and maintenance to electrical components shall include initial safety checks and component
inspection procedures. If a fault exists that could compromise safety, then no electrical supply shall be
connected to the circuit until it is satisfactorily dealt with. If the fault cannot be corrected immediately but it
is necessary to continue operation, an adequate temporary solution shall be used. This shall be reported
to the owner of the equipment so all parties are advised.
Initial safety checks shall include:
(1) that capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking.
(2) that no live electrical components and wiring are exposed while charging, recovering or purging the
system.
(3) that there is continuity of earth bonding.
■ Repairs to sealed components
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 is absolutely 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.
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 aected. This shall include damage to
cables, excessive number of connections, terminals not made to original specication, damage to seals,
incorrect tting 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 ammable atmospheres. Replacement parts shall be in accordance with the
manufacturer’s specications.
NOTE
The use of silicon sealant may inhibit the eectiveness of some types of leak detection equipment.
Intrinsically safe components do not have to be isolated prior to working on them.
■ Repair to intrinsically safe components
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 use.
Intrinsically safe components are the only types that can be worked on while live in the presence of a
ammable atmosphere. The test apparatus shall be at the correct rating.
Replace components only with parts specified by the manufacturer. Other parts may result in the
ignition of refrigerant in the atmosphere from a leak.
■ Cabling
Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or
any other adverse environmental eects. The check shall also take into account the eects of ageing or
continual vibration from sources such as compressors or fans.
■ Detection of ammable refrigerants
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 ame) shall not be used.
To Next Page
Loading...
