DiversiTech International Ltd.
Glaisdale Drive East, NG8 4LY
Nottingham United Kingdom
Email sales@pumph.co.uk
Phone +44(0)115 900 5858
8
FOR FURTHER INSTALLATION ADVICE PLEASE CALL THE TECHNICAL SUPPORT HELPLINE ON 0115 900 5858.
viii Checks to the refrigeration equipment
Where electrical components are being changed, they shall be t for the purpose and to the correct
specication. At all times the manufacturer’s maintenance and service guidelines shall be followed. If in doubt
consult the manufacturer’s technical department for assistance. The following checks shall be applied to
installations using ammable refrigerants:
The charge size is in accordance with the room size within which the refrigerant containing parts are installed;
The ventilation machinery and outlets are operating adequately and are not obstructed;
If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of
refrigerant; Marking to the equipment continues to be visible and legible. Markings and signs that are illegible shall
be corrected;
Refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any
substance which may corrode refrigerant containing components, unless the components are constructed of
materials which are inherently resistant to being corroded or are suitably protected against being so corroded.
viiii Checks to 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:
That capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking; That there no
live electrical components and wiring are exposed while charging, recovering or purging the system; That there is
continuity of earth bonding.
7. Repairs to sealed components
i 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.
ii 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 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 effectiveness of some types of leak detection equipment.
Intrinsically safe components do not have to be isolated prior to working on them.
8. 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 specied by the manufacturer. Other parts
may result in the ignition of refrigerant in the atmosphere from a leak.
9. Cabling
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 account the effects of aging or continual vibration
from sources such as compressors or fans.
WARNING
FOR USING R32/R290 REFRIGERANT
PAC-H-12
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