INVENTOR M2GHP290-12, User Manual

Page: 7 / 64

EN 7
|Warnings (for using R290/R32 refrigerant only)
The repair and the maintenance to the electrical
components must include safety checks and
also component inspection procedures. If there
is any fault, that may compromise the safety of
the work applied, then no electrical supply shall
be connected to the circuit until it is corrected. If
the fault cannot be corrected immediately but it
is necessary to continue operation, a temporary
solution may be applied, such as the reporting
to the owner of the equipment, so all parties are
informed.
Initial safety checks shall include:
Capacitors are discharged, in a safe manner to
avoid any possible sparking. No active electrical
components and wirings are exposed while
charging, recovering or purging the system. That
there is continuity of earth bonding.
7. Repairs to sealed components
1) During any performed repairs to sealed
components, all electrical supplies must be
disconnected from the equipment prior to this
act. If it is necessary to have an electrical supply
to the equipment during its servicing, then a
leak detector should be applied as to warn if
there are any signs of potential hazards present.
2) There should be particular attention to
the following as to ensure, that by working on
electrical components there is no alteration
to the casing in such a way that the level of
protection is affected. This includes damage to
the cables, excessive number of connections,
terminals not designed to original specifications,
any damage to seals, the incorrect fitting of
glands, etc.
Ensure the unit is mounted securely.
Ensure that the seals or any sealing materials
have not degraded in such a manner as
to no longer serve its purpose, preventing
flammable gases entering the atmosphere. Any
replacement parts should be in accordance as
per the manufacturer’s specifications.
NOTE: The use of silicon sealant may affect
the efficiency of some types of leak detection
equipment. Safe components do not have to be
isolated prior to working.
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, allowed for the
equipment in use. Intrinsically safe components
are the only type that can be worked on, while
live in the presence of flammable atmosphere.
The test apparatus should be at the correct
rating. Any replacement of parts should be as
specified by the Manufacturer, as other parts
may result in an ignition of refrigerant gas from
a possible leak.
9.Cabling
Please check that cables are not subject to wear,
corrosion, excessive pressure, vibration, or any
other adverse environmental effects. Aging or
continual vibration, should also be taken into
account.
10. Detection of flammable refrigerants
Under no circumstance may a potential ignition
source, such as a halide torch or any detector
with the use of a flame, may be used.
11. Leak detection methods
The following leak detection methods are
acceptable for systems containing flammable
refrigerants.
Electronic leak detectors may be used to detect
flammable refrigerants. However, the sensitivity
may not be adequate, or it is possible it may
need re- calibration.
(Detection equipment should be calibrated in
a refrigerant- free area) It should be ensured
that the detector is not a possible ignition
source and is suitable for the refrigerant used.
Leak detection equipment should be set at a
percentage of the LFL of the refrigerant used.
Leak detection equipment should be set at
a percentage of the LFL of the refrigerant
and should be calibrated to the refrigerant
employed and the appropriate percentage
of gas (25% maximum) is confirmed. Leak
detection fluids are suitable for use with
most refrigerants but the use of detergents
containing chlorine must be avoided as the
chlorine may react with the refrigerant and
corrode the copper pipe- work. If a leak is
suspected, all flames must be extinguished. If a
leakage of refrigerant is spotted which requires
brazing, all of the refrigerant shall be recovered
from the system, or isolated (by means of
shutting off the valves) in a part of the system
away from the leak. Oxygen free nitrogen (OFN)
should then be purged through the system
both before and during the brazing process.
12. Removal and evacuation
When interfering with the refrigerant circuit