Daikin Rebel Applied DPSA - Information and Training; Commissioning; Maintenance; Repair

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www.DaikinApplied.com 95 IM 1287-6 • REBEL APPLIED ROOFTOP
Information and Training
The training should include the substance of
the following
• Information about the explosion potential of ammable
refrigerants to show that ammables may be dangerous
when handled without care.
• Information about potential ignition sources, especially
those that are not obvious, such as lighters, light
switches, vacuum cleaners, electric heaters.
• Information about the di󰀨erent safety concepts:
— Unventilated: Safety of the appliance does not
depend on ventilation of the housing. Switching
o󰀨 the appliance or opening of the housing has no
signicant e󰀨ect on safety. Nevertheless, it is possible
that leaking refrigerant may accumulate inside the
enclosure and ammable atmosphere will be released
when the enclosure is opened.
— Ventilated enclosure: Safety of the appliance
depends on ventilation of the housing. Switching
o󰀨 the appliance or opening of the enclosure has a
signicant e󰀨ect on safety. Care should be taken to
ensure su󰀩cient ventilation before.
— Ventilated room: Safety of the appliance depends on
the ventilation of the room. Switching o󰀨 the appliance
or opening of the housing has no signicant e󰀨ect
on safety. The ventilation of the room shall not be
switched o󰀨 during repair procedures.
• Information about refrigerant detectors:
— Principle of function, including inuences on the
operation.
— Procedures, how to repair, check or replace a
refrigerant detector or parts of it in a safe way.
— Procedures, how to disable a refrigerant detector in
case of repair work on the refrigerant carrying parts.
• Information about the concept of sealed components and
sealed enclosures according to IEC 60079-15:2010.
• Information about the correct working procedures:
— Commissioning
a. Ensure that the oor area is su󰀩cient for the
refrigerant charge or that the ventilation duct is
assembled in a correct manner.
b. Connect the pipes and carry out a leak test before
charging with refrigerant.
c. Check safety equipment before putting into
service.
— Maintenance
a. Portable equipment shall be repaired outside or in
a workshop specially equipped for servicing units
with ammable refrigerants.
b. Ensure su󰀩cient ventilation at the repair place.
c. Be aware that malfunction of the equipment may
be caused by refrigerant loss and a refrigerant leak
is possible.
d. Discharge capacitors in a way that won’t cause any
spark. The standard procedure to short circuit the
capacitor terminals usually creates sparks.
e. Reassemble sealed enclosures accurately. If seals
are worn, replace them.
f. Check safety equipment before putting into
service.
— Repair
a. Portable equipment shall be repaired outside or in
a workshop specially equipped for servicing units
with ammable refrigerants.
b. Ensure su󰀩cient ventilation at the repair place.
c. Be aware that malfunction of the equipment may
be caused by refrigerant loss and a refrigerant leak
is possible.
d. Discharge capacitors in a way that won’t cause
any spark.
e. When brazing is required, the following procedures
shall be carried out in the right order:
• Remove the refrigerant. R-32 should always be recovered
and never released directly into the environment. Take
care that the drained refrigerant will not cause any
danger. In doubt, one person should guard the outlet.
Take special care that drained refrigerant will not oat
back into the building.
• Evacuate the refrigerant circuit.
• Remove parts to be replaced by cutting, not by ame.
• Purge the braze point with nitrogen during the brazing
procedure.
• Carry out a leak test before charging with refrigerant.
a. Reassemble sealed enclosures accurately. If seals
are worn, replace them.
b. Check safety equipment before putting into
service.
— Decommissioning
a. The refrigerant charge must be removed before
decommissioning.
b. Ensure su󰀩cient ventilation at the equipment
location.
c. Be aware that malfunction of the equipment may
be caused by refrigerant loss and a refrigerant leak
is possible.
d. Discharge capacitors in a way that won’t cause
any spark.
e. Remove the refrigerant. R-32 should always be
recovered and never released directly into the
environment. Take care that the drained refrigerant
will not cause any danger. In doubt, one person
should guard the outlet. Take special care that
drained refrigerant will not oat back into the
building.
— Disposal