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(13) 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 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 seals or sealing materials have not degraded to the point 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.
(14) 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
flammable 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.
<Caution items>
(1) The opposite side dimension of the Air to Water Heat Pump’s flared nut using R32 and the shape of the charge
port are the same as those of R410A.
(2) Be careful not to charge refrigerant by mistake. Should the different type of refrigerant mix in, be sure to
recharge the refrigerant.
(3) Do not mix the other refrigerant or refrigerating oil with the refrigerant.
(4) Since the pressure of R32 is 1.6 times higher than that of the former refrigerant (R22), use tools and parts with
high pressure resistance specification similar to R410A.
(5) In the installation time, use clean pipe materials and work with great attention so that water and others do not
mix in because pipes are affected by impurities such as water, oxide film, oil, etc. Use the clean pipes. Be sure
to braze while flowing nitrogen gas in the pipe. (Never use gas other than nitrogen gas.)
(6) For the earth protection, use a vacuum pump for air purge.
(7) R32 refrigerant is Single-component refrigerant that does not change its composition.
Although it is possible to charge the refrigerant with either liquid or gas, charge it with liquid.
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