Stirling PA19W User manual

AFTER SALES SUPPORT
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AUS MODEL: PA19W PRODUCT CODE: 703227 11/2020
Model Number PA19W
Wi-Fi Portable Air Conditioner
(1.9kW Cooling)
SERVICE MANUAL

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AUS MODEL: PA19W PRODUCT CODE: 703227 11/2020
Important safety precautions concerning refrigerant R290
WARNING: Combustible & Dangerous
This symbol alerts you to take care as the appliance contains
a flammable refrigerant: R290 (propane). Take extra care when
installing the unit and when carrying out maintenance. R290 is
a colourless and odourless hydrocarbon gas. It is an efficient
refrigerant with a low Global Warming Potential (GWP) and no
potential for ozone depletion.
While R290 is highly flammable, there will be no risk of burning and explosion if the
appliance is properly installed and maintained following all instructions and safety
advice in the supplied manuals.
R290-Specific Safety Advice
WARNING!
• The room in which this air conditioner is installed must have a minimum area of more
than 4m2. (This unit is designed for use in a room of approximately 10–14m2 size.)
• The appliance shall be stored in a well-ventilated area without continuously
operating sources, such as open flames, an operating ignition gas appliance or an
operating electric heater. Do not expose the appliance to high heat, sparks and open
flames.
• Do not pierce or burn the appliance.
• Do not use means to accelerate the defrosting process or to clean, other than those
recommended by the manufacturer.
• Be aware that refrigerants may not contain an odour.
• The ratings of the fuse installed in the built-in control unit are T, 2AL, 250V~.
• This air conditioner has been fully charged with refrigerant at the factory. Should a
recharge become necessary, it may only be recharged by a professional installer.
• Maintenance must only be carried out by properly qualified, authorised personnel. If
the appliance requires maintenance or service, contact our after sales support centre.
• The service technician must strictly comply with:
– all safety instructions in the manual provided with the appliance
– all relevant provisions of gas-related local laws and regulations.
• After servicing the appliance, the service technician must:
– check that air cannot enter the refrigerant system
– check for refrigerant leaks when moving the air conditioner
– carry out a test cycle under controlled conditions after installing the unit and record
the operating data.

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AUS MODEL: PA19W PRODUCT CODE: 703227 11/2020
Service Instructions
• Special training additional to usual refrigerating equipment repair
procedures is required. For maintenance, service and repair operations, the
working personnel needs to be certified.
• Examples for such working procedures are:
– breaking into the refrigerating circuit
– opening of sealed components
– opening of ventilated enclosures.
Specific information for service personnel
• The installation of pipe work shall be kept to a minimum.
• Pipe work shall be protected from physical damage and shall not be installed in
an unventilated space.
• Compliance with national gas regulations shall be observed.
• Mechanical connections made by brazing or welding shall be accessible for
maintenance purposes.
Table: Minimum room area (m2): R290
LFL
(kg/m3)h0(m)
Charge amount (M) (kg)
Minimum room area (m2)
0.152kg 0.228kg 0.304kg 0.456kg 0.608kg 0.76kg 0.988kg
0.038
0.6 82 146 328 584 912 1541
1.0 30 53 118 210 328 555
1.8 9 16 36 65 101 171
2.2 6 11 24 43 68 115
h0is the room height.
The maximum refrigerant charge amount is 140g.
WARNING: Keep any required ventilation openings clear of obstruction.

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AUS MODEL: PA19W PRODUCT CODE: 703227 11/2020
Service Instructions (Cont.)
1. 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, points 1.2 to 1.6 below
shall be completed prior to conducting work on the system.
1.1 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.
1.2 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.
1.3 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 toxic or
flammable atmospheres. Ensure that the leak detection equipment being
used is suitable for use with all applicable refrigerants, i.e. non-sparking,
adequately sealed or intrinsically safe.
1.4 Presence of fire extinguisher
If any hot work is to be conducted on the refrigeration equipment or any as-
sociated parts, appropriate fire extinguishing equipment shall be available
to hand. Have a dry powder or CO2 fire extinguisher adjacent to the charg-
ing area.
1.5 No ignition sources
No person carrying out work in relation to a refrigeration system which
involves exposing any pipe work 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 sufficiently far away
from the site of installation, repairing, removing and disposal, during which
refrigerant can possibly be released to the surrounding space. Prior to work
taking place, the area around the equipment is to be surveyed to make sure
that there are no flammable hazards or ignition risks. “No Smoking” signs
shall be displayed.

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Service Instructions (Cont.)
1.6 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.
2. Checks to the refrigeration equipment
2.1 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 manufacturer’s technical department for assistance.
2.2 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.
3. Checks to electrical devices
3.1 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.
3.2 Initial safety checks shall include:
– that capacitors are discharged: this shall be done in a safe manner to
avoid possibility of sparking
– that no live electrical components and wiring are exposed while charging,
recovering or purging the system
– that there is continuity of earth bonding.

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4. Repairs to sealed components
4.1 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 detection shall be located at the most critical point to warn of a
potentially hazardous situation.
4.2 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 connections, terminals not made to original
specification, damage to seals, incorrect fitting of glands, etc. Ensure that
the apparatus is mounted securely.
4.3 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.
NOTE The use of silicon sealant can inhibit the effectiveness of some types
of leak detection equipment.
Intrinsically safe components do not have to be isolated prior to working on
them.
5. Repair to intrinsically safe components
5.1 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.
5.2 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.
5.3 Replace components only with parts specified by the manufacturer. Other
parts may result in the ignition of refrigerant in the atmosphere from a leak.
6. 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.
7. 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.
Service Instructions (Cont.)

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AUS MODEL: PA19W PRODUCT CODE: 703227 11/2020
8. Leak detection methods
The following leak detection methods are deemed acceptable for all refrigerant
systems.
8.1 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 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 (lower flammable limit, 0.038 kg/m3) of the refrigerant
and shall be calibrated to the refrigerant employed, and the appropriate
percentage of gas (25% maximum) is confirmed.
8.2 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.
8.3 If a leak is suspected, all naked flames shall be removed/extinguished.
8.4 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.
9. Removal and evacuation
9.1 When breaking into the refrigerant circuit to make repairs – or for any other
purpose – conventional procedures shall be used. However, for flammable
refrigerants 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.
9.2 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 purging refrigerant systems.
9.3 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.
Service Instructions (Cont.)

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9.4 Ensure that the outlet for the vacuum pump is not close to any ignition sources
and that ventilation is available.
10 Charging procedures
In addition to conventional charging procedures, the following requirements shall be
followed.
10.1 Ensure that contamination of different refrigerants does not occur when using
charging equipment. Hoses or lines shall be as short as possible to minimise
the amount of refrigerant contained in them.
– Cylinders shall be kept upright.
– Ensure that the refrigeration system is earthed prior to charging the system
with refrigerant.
– Label the system when charging is complete (if not already).
– Extreme care shall be taken not to overfill the refrigeration system.
10.2 Prior to recharging the system, it shall be pressure-tested with the appropriate
purging gas.
10.3 The system shall be leak-tested on completion of charging but prior to
commissioning. A follow up leak test shall be carried out prior to leaving the
site.
11. Decommissioning
Before carrying out this procedure, it is essential that the technician is completely
familiar with the equipment and all its detail. It is recommended good practice
that all refrigerants are recovered safely. Prior to the task being carried out, an oil
and refrigerant sample shall be taken in case analysis is required prior to re-use of
reclaimed refrigerant. It is essential that electrical power is available before the task
is commenced.
11.1 Become familiar with the equipment and its operation.
11.2 Isolate system electrically.
11.3 Before attempting the procedure, ensure that:
– mechanical handling equipment is available, if required, for handling
refrigerant cylinders
– all personal protective equipment is available and being used correctly
– the recovery process is supervised at all times by a competent person
– recovery equipment and cylinders conform to the appropriate standards.
11.4 Pump down refrigerant system, if possible.
11.5 If a vacuum is not possible, make a manifold so that refrigerant can be
removed from various parts of the system.
11.6 Ensure that the cylinder is situated on the scales before recovery takes place.
Service Instructions (Cont.)

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11.7 Start the recovery machine and operate in accordance with manufacturer’s
instructions.
11.8 Do not overfill cylinders. (No more than 80% volume liquid charge.)
11.9 Do not exceed the maximum working pressure of the cylinder, even
temporarily.
11.10 When the cylinders have been filled correctly and the process completed,
make sure that the cylinders and the equipment are removed from site
promptly and all isolation valves on the equipment are closed off.
11.11 Recovered refrigerant shall not be charged into another refrigeration system
unless it has been cleaned and checked.
12. 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.
13. Recovery
13.1 When removing refrigerant from a system, either for servicing or
decommissioning, it is recommended good practice that all refrigerants are
removed safely.
13.2 When transferring refrigerant into cylinders, ensure that only appropriate
refrigerant recovery cylinders are employed. Ensure that the correct number
of cylinders for holding the total system charge are available. All cylinders
to be used are designated for the recovered refrigerant and labelled for that
refrigerant (i.e., special cylinders for the recovery of refrigerant). Cylinders shall
be complete with pressure relief valve and associated shut-off valves in good
working order. Empty recovery cylinders are evacuated and, if possible, cooled
before recovery occurs.
13.3 The recovery equipment shall be in good working order with a set of
instructions concerning the equipment that is at hand and shall be suitable
for the recovery of all appropriate refrigerants including, when applicable,
flammable refrigerants. In addition, a set of calibrated weighing scales shall
be available and in good working order. Hoses shall be complete with leak-
free disconnect couplings and in good condition. Before using the recovery
machine, check that it is in satisfactory working order, has been properly
maintained and that any associated electrical components are sealed to
prevent ignition in the event of a refrigerant release. Consult manufacturer if in
doubt.
13.4 The recovered refrigerant shall be returned to the refrigerant supplier in the
correct recovery cylinder, and the relevant waste transfer note arranged. Do not
mix refrigerants in recovery units and especially not in cylinders.
Service Instructions (Cont.)

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13.5 If compressors or compressor oils are to be removed, ensure that they
have been evacuated to an acceptable level to make certain that flammable
refrigerant does not remain within the lubricant. The evacuation process shall
be carried out prior to returning the compressor to the suppliers. Only electric
heating to the compressor body shall be employed to accelerate this process.
When oil is drained from a system, it shall be carried out safely.
14. Information about the correct working procedures:
Every working procedure that affects safety means shall only be carried out by
competent persons according to the below points:
14.1 Commissioning
• Ensure that the floor area is sufficient for the refrigerant charge or that the
ventilation duct is assembled in a correct manner.
• Connect the pipes and carry out a leak test before charging with refrigerant.
• Check safety equipment before putting into service.
14.2 Maintenance
• Portable equipment shall be repaired outside or in a workshop specially
equipped for servicing units with flammable refrigerants.
• Ensure sufficient ventilation at the repair place.
• Be aware that malfunction of the equipment may be caused by refrigerant
loss and a refrigerant leak is possible.
• Discharge capacitors in a way that won’t cause any spark. The standard
procedure to short-circuit the capacitor terminals usually creates sparks.
• Reassemble sealed enclosures accurately. If seals are worn, replace them.
• Check safety equipment before putting into service.
14.3 Repair
• Portable equipment shall be repaired outside or in a workshop specially
equipped for servicing units with flammable refrigerants.
• Ensure sufficient ventilation at the repair place.
• Be aware that malfunction of the equipment may be caused by refrigerant
loss and a refrigerant leak is possible.
• Discharge capacitors in a way that won’t cause any spark.
• When brazing is required, the following procedures shall be carried out in the
right order:
– Remove the refrigerant. If the recovery is not required by national
regulations, drain the refrigerant to the outside. 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 float back into
the building.
Service Instructions (Cont.)

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– Evacuate the refrigerant circuit.
– Purge the refrigerant circuit with nitrogen for 5 min.
– Evacuate again.
– Remove parts to be replaced by cutting, not by flame.
– Purge the braze point with nitrogen during the brazing procedure.
– Carry out a leak test before charging with refrigerant.
• Reassemble sealed enclosures accurately. If seals are worn, replace them.
• Check safety equipment before putting into service.
14.4 Decommissioning
• If the safety is affected when the equipment is putted out of service, the
refrigerant charge shall be removed before decommissioning.
• Ensure sufficient ventilation at the equipment location.
• Be aware that malfunction of the equipment may be caused by refrigerant
loss and a refrigerant leak is possible.
• Discharge capacitors in a way that won’t cause any spark.
• Remove the refrigerant. If the recovery is not required by national regulations,
drain the refrigerant to the outside. 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 float back into the building.
• Evacuate the refrigerant circuit.
• Purge the refrigerant circuit with nitrogen for 5 min.
• Evacuate again.
• Fill with nitrogen up to atmospheric pressure.
• Put a label on the equipment that the refrigerant is removed.
14.5 Disposal
• Ensure sufficient ventilation at the working place.
• Remove the refrigerant. If the recovery is not required by national regulations,
drain the refrigerant to the outside. Take care that the drained refrigerant will
not cause any danger. If in doubt, one person should guard the outlet. Take
special care that drained refrigerant will not float back into the building.
• Evacuate the refrigerant circuit.
• Purge the refrigerant circuit with nitrogen for 5 min.
• Evacuate again.
• Cut out the compressor and drain the oil.
Service Instructions (Cont.)

AFTER SALES SUPPORT
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AUS MODEL: PA19W PRODUCT CODE: 703227 11/2020
Compliance
This appliance has
been fully tested and
meets all requirements
as set out by
standards AS/NZS
60335.1 and AS/NZS
60335.2.40.
The RCM Mark (Regulatory Compliance Mark) indicates that the product
complies with the relevant guidelines of the ACMA as well as corresponding
government requirements for the safety of electrical devices.
Licensed service technician details
We recommend that you ask your licensed service technician to fill in the
details below so you have them on record should you need to contact the
technician in the future.
Please fill in the details below:
Name of service technician: ..................................................................
Licence number: ....................................................................................
Date of service: ......................................................................................
Signature: ..............................................................................................
Service Manual Version 1.1 July 2020
Technical specifications
Model PA19W
Cooling capacity 1.9kW
Refrigerant, quantity R290, 140g
Permissible excessive
operating pressure
Discharge 2.6MPa
Suction 1.0MPa
Max. allowable pressure Discharge 3.2MPa
Suction 1.2MPa
Weight 20kg
Rated voltage 220-240V~
Rated frequency 50Hz
Rated current 3.2A
Rated input 710W
Resistance class IP20
Dimensions (mm) 320(W) x 690(H) x 290(D)