Mitsubishi Electric PUZ-WZ50VAA Service Manual page 5

[2] Warning for service
(1) The user should never attempt to repair the unit or transfer it to another location. If the unit is installed incorrect-
ly, water leakage, electric shock, fire or explosion may result. If the outdoor unit must be repaired or moved, ask
a dealer or a competent electrician with the requisite professional qualifications in your jurisdiction.
(2) Do not alter the unit. Consult a dealer or authorised technician for repairs. If alterations or repairs are not per-
formed correctly, water leakage, electric shock, fire or explosion may result.
(3) For installation and relocation work, follow the instructions in the Installation Manual.
(4) The unit must only be installed/serviced/relocated/repaired/disposed, including any work undertaken on a related
refrigerant circuit, by a competent electrician, with the requisite professional qualifications to install this unit and
perform electrical works in your jurisdiction. Please contact your dealer for them.
Failure to conduct electric work, deal with the refrigerant circuit(s) and install/service/relocate/repair or dispose
the unit correctly in accordance with the foregoing and all laws and regulations may lead to prosecution, water
leakage, electric shock or fire.
Mitsubishi Electric does not accept responsibility for any direct, indirect, special or consequential loss, damage,
liability or expense incurred or suffered which results from any works undertaken by an unqualified or third party
installer, or any failure, claim, damage or deficiency caused to a unit by improper installation, servicing, reloca-
tion, repair or disposing.
(5) The unit must be installed according to the Installation Manual in order to minimize the risk of damage from
earthquakes, typhoons, or strong winds. An incorrectly installed unit may fall down and cause damage or inju-
ries.
The unit must be securely installed on a structure that can sustain its weight. If the unit is mounted on an unsta-
ble structure, it may fall down and cause damage or injuries.
(6) Refrigerant pipes connection shall be accessible for maintenance purposes.
(7) If the outdoor unit is installed in a small room, measures must be taken to prevent the refrigerant concentration in
the room from exceeding the safety limit in the event of refrigerant leakage.
Consult an installer regarding the appropriate measures to prevent the allowable concentration from being
exceeded. Be sure to install it in an appropriate place according to section 2.4 "Choosing the outdoor unit installa-
tion location", 2.5 "Minimum installation area" and 2.6 "Protective Zone".
Should the refrigerant leak and cause the concentration limit to be exceeded, hazards due to lack of oxygen, fire, or
explosion hazards in the room may result.
Ventilate the room if refrigerant leaks during operation. If refrigerant comes into contact with a flame, there is risk of
fire or explosion.
(8) Keep gas-burning appliances, electric heaters, electrical switches and other ignition sources away from the
around the outdoor unit, protective zone and the location where installation, repair, and other work will be per-
formed.
If refrigerant comes into contact with a flame, a fire or explosion will occur.
Static electricity is also an ignition source. Anti-static measures (anti-static and static electricity elimination)
should be taken before work.
(9) When servicing the heat pump unit, use only the specified refrigerant (R290) to charge the refrigerant lines.
Do not mix it with any other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant line, and
may result in an explosion and other hazards.
The use of any refrigerant other than that specified for the system will cause mechanical failure or system mal-
function or unit breakdown. In the worst case, this could lead to a serious impediment to securing product safe-
ty.
(10) After installation or servicing has been completed, the installer or service provider must check for refrigerant
leaks by using a professional leak detector tool. If refrigerant leaks into the room and comes into contact with
the flame of a heater, or portable cooking range, sparks, static electricity or objects with high surface tempera-
ture (>370°C), a fire or explosion will occur, and all persons in close or adjacent vicinity of the leak must be
immediately advised to move away to a safe distance in order for the area to be checked by a professional.
(11) Do not remove the parts from the unit by flame such as brazing and by tools such as a hacksaw or mechanical
cutting tools which can cause sparking.
(12) Do not use low temperature solder alloy in case of brazing the refrigerant pipes.
(13) When the installer and the service provider is performing brazing work, be sure to ventilate the room sufficiently
or work outside. Make sure that there are no hazardous or flammable materials nearby.
Do not brazing the pipe and unit which contain refrigerant. Make sure that the refrigerant has been removed
completely before brazing.
(14) When performing the work in a closed room, small room, or similar location, provide adequate ventilation due to
open the door or windows and using a fan compliant with R290.
If refrigerant leaks and accumulates, it may ignite and explosion.
(15) When performing the work, make sure that there are no refrigerant leaks by detector before and during perform-
ing the work.
In the event of refrigerant leakage, to do as follows:
- Evacuate any people from the danger zone.
- From a safe position, switch off the electricity supply for all system components.
- Remove ignition sources from the danger zone.
- Do not operate the unit until repairs are completed.
OCH816
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