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SWIMMING POOL HEAT PUMP TYPE PX
5.
MAINTENANCE AND INSPECTION
Check the water supply device and the release often.
You should avoid the condition of no water or air
entering into system, as this will influence unit's
performance and reliability. You should clear the pool/
spa filter regularly to avoid damage to the unit as a
result of the dirty of clogged filter.
The area around the unit should be dry, clean and well
ventilated. Clean the side heating exchanger regularly
to maintain good heat exchange as conserve energy.
The operation pressure of the refrigerant system should
only be serviced by a certified technician.
Check the power supply and cable connection often.
Should the unit begin to operate abnormally, switch it
off and contact the qualified technician.
Discharge all water in the water pump and water
system, so that freezing of the water in the pump or
water system does not occur. You should discharge the
water at the bottom of water pump if the unit will not
be used for an extended period of time. You should
check the unit thoroughly and fill the system with
water fully before using it for the first time
Checks to the area
Prior to beginning work on systems containing flammable
refrigerants, safety checks are necessary to ensure that
the risk of ignition is minimised. For repair to the
refrigerating system, the following precautions shall be
complied with prior to conducting work on the system.
Work procedure
Work shall be undertaken under a controlled procedure
so as to minimise the risk of a flammable gas or vapour
being present while the work is being performed
General work area
All maintenance staff and others working in the local
area shall be instructed on the nature of work being
carried out. Work in confined spaces shall be avoided.
The area around the workspace shall be sectioned off.
Ensure that the conditions within the area have been
made safe by control of flammable material.
Checking for presence of refrigerant
The area shall be checked with an appropriate refrigerant
detector prior to and during work, to ensure the technician
is aware of potentially flammable atmospheres. Ensure
that the leak detection equipment being used is
suitable for use with flammable refrigerants, i.e.
non-sparking, adequately sealed or intrinsically safe.
Presence of fire extinguisher
If any hot work is to be conducted on the refrigeration
equipment or any associated parts, appropriate fire
extinguishing equipment shall be available to hand.
Have a dry powder or CO2 fire extinguisher adjacent to
the charging area.
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No ignition sources
No person carrying out work in relation to a refrigeration
system which involves exposing any pipe work that
contains or has contained flammable refrigerant shall
use any sources of ignition in such a manner that it may
lead to the risk of fire or explosion. All possible ignition
sources, including cigarette smoking, should be kept
su ciently far away from the site of installation, repairing,
removing and disposal, during which flammable refrige-
rant can possibly be released to the surrounding space.
Prior to work taking place, the area around the equip-
ment is to be surveyed to make sure that there are no
flammable hazards or ignition risks. "No Smoking" signs
shall be displayed.
Ventilated area
Ensure that the area is in the open or that it is adequately
ventilated before breaking into the system or conducting
any hot work. A degree of ventilation shall continue during
the period that the work is carried out. The ventilation
should safely disperse any released refrigerant and
preferably expel it externally into the atmosphere.
prolonged period of no usage.
Checks to the refrigeration equipment
Where electrical components are being changed, they
shall be fit for the purpose and to the correct specification.
At all times the manufacturer's maintenance and service
guidelines shall be followed. If in doubt consult the manu-
facturer's technical department for assistance. The
following checks shall be applied to installations using
flammable 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.
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.
Alterations which serve the technological progress as well as errors excepted!
SWIMMING POOL HEAT PUMP TYPE PX
Repairs to sealed components
1 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 detec-
tion shall be located at the most critical point to
warn of a potentially hazardous situation.
2 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 connec-
tions, terminals not made to original specification,
damage to seals, incorrect fitting 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 flammable atmospheres.
Replacement parts shall be in accordance with the
manufacturer's specifications.
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 on them.
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 flammable atmosphere. The test
apparatus shall be at the correct rating. Replace com-
ponents only with parts specified by the manufacturer.
Other parts may result in the ignition of refrigerant in
the atmosphere from a leak.
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.
Detection of flammable refrigerants
Under no circumstances shall 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) shall not be used.
Alterations which serve the technological progress as well as errors excepted!
Leak detection methods
The following leak detection methods are deemed
acceptable for systems containing flammable re-
frigerants. Electronic leak detectors shall be used to
detect flammable refrigerants, but the sensitivity may
not be adequate, or may need re-calibration. (Detection
equipment shall 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 shall be set at a percentage of
the LFL of the refrigerant and shall 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 shall be
avoided as the chlorine may react with the refrigerant
and corrode the copper pipe-work. If a leak is suspected,
all naked flames shall be removed/ extinguished. If a
leakage of refrigerant is found which requires brazing,
all of the refrigerant shall be recovered from the
system, or isolated (by means of shut off valves) in a
part of the system remote from the leak. Oxygen free
nitrogen (OFN) shall then be purged through the
system both before and during the brazing process.
Removal and evacuation
When breaking into the refrigerant circuit to make
repairs or for any other purpose conventional
procedures shall be used. However, it is important
that best practice is followed since flammability is a
consideration. The following procedure shall be
adhered to:
- Remove refrigerant;
- Purge the circuit with inert gas;
- Evacuate;
- Purge again with inert gas;
- Open the circuit by cutting or brazing.
The refrigerant charge shall be recovered into the
correct recovery cylinders. The system shall be „flushed"
with OFN to render the unit safe. This process may
need to be repeated several times. Compressed air or
oxygen shall not be used for this task. Flushing shall
be achieved by breaking the vacuum in the system
with OFN and continuing to fill until the working
pressure is achieved, then venting to atmosphere, and
finally pulling down to a vacuum. This process shall be
repeated until no refrigerant is within the system.
When the final OFN charge is used, the system shall
be vented down to atmospheric pressure to enable
work to take place. This operation is absolutely vital if
brazing operations on the pipe-work are to take place.
Ensure that the outlet for the vacuum pump is not
close to any ignition sources and there is ventilation
available. working on them.
Labelling
Equipment shall be labelled stating that it has been
de-commissioned and emptied of refrigerant. The
label shall be dated and signed. Ensure that there are
labels on the equipment stating the equipment
contains flammable refrigerant.
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