Servicing and Repair Information
Ensure the markings on the equipment continues to be visible
and legible. Markings and signs that are illegible must be
corrected.
Ensure the refrigerating pipes or components are installed in
a position where they are unlikely to be exposed to any
substance that may corrode refrigerant containing
components, unless the components are constructed of
materials that are inherently resistant to being corroded or
are suitably protected against being so corroded.
16.4 Checks to Electrical Devices
Repair and maintenance to electrical components must include
initial safety checks and component inspection procedures. If a
fault exists that could compromise safety, then electrical supply
must NOT be connected to the circuit until the safety fault is
satisfactorily corrected. If the fault cannot be corrected
immediately but it is necessary to continue operation, an
adequate temporary solution must be used. This must be
reported to the owner of the equipment, so all parties are
advised.
The following are required initial safety checks:
Ensure that capacitors are discharged—this must be done in a
safe manner to avoid possibility of sparking.
Ensure that no live-electrical components and wiring are
exposed while charging, recovering, or purging the system.
Ensure that there is continuity of earth bonding.
16.5 Repairs to Sealed Components
Sealed-electrical components must be replaced.
16.6 Repair to Intrinsically Safe Components
Intrinsically safe components must be replaced.
16.7 Check Cabling
Check that cabling will not be subject to wear, corrosion,
excessive pressure, vibration, sharp edges, or any other adverse
environmental effects. The check must also take into account the
effects of aging or continual vibrations from sources such as
compressors or fans.
16.8 Detection of Flammable Refrigerants
Under NO circumstances may 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 flame) must
NOT be used.
The following leak-detection methods are deemed acceptable for
all refr
igerant systems:
• Electronic leak detectors may be used to detect refrigerant
leaks but in the case of flammable refrigerants, the sensitivity
may not be adequate or may need re-calibration. (Detection
equipment must be calibrated in a refrigerant-free area.).
Ensure that the detector is not a potential source of ignition
and is suitable for the refrigerant used. Leak-detection
equipment must be set to a percentage for the Lower-
Flammable Limit (LFL) (25% maximum) of the gas that is
confirmed.
• Leak detection fluids are also 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. Examples of
leak detection fluids are:
— bubble method
— fluorescent method agents.
If a leak is suspected, all naked flames must be removed/
e
xtingui
shed.
If a leakage of refrigerant is found that requires brazing, all of the
refrige
rant must be recovered from the system or isolated (by
means of shut-off valves) in a part of the system remote from the
leak.
16.9 Removal and Evacuation
When breaking into the refrigerant circuit to make repairs—or for
any other purpose—conventional procedures must be used.
However, for flammable refrigerants it is important that best
practice be followed, since flammability is a consideration. The
following procedure must be adhered to:
1. Safely remove refrigerant following local and national
regulations
2. Evacuate
3. Purge the circuit with inert gas (optional for A2L)
4. Evacuate (optional for A2L)
5. Continuously flush or purge with inert gas when using flame
to open circuit
6. Open the circuit.
The refrigerant charge must be recovered into the correct
r
ecovery c
ylinders if venting is not allowed by local or national
codes. For appliances containing flammable refrigerants, the
system must be purged with oxygen-free nitrogen to render the
appliance safe for flammable refrigerants. This process might
need to be repeated several times. Compressed air or oxygen
must not be used for purging refrigerant systems.
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EC Series Heat Pumps — 8733841499 (2024/05)
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