iAIRE, LLC
55
SHVAC
Residential Mini-Split and Mounting Kit I/O/M
9k - 24k Installation and Maintenance (cont’d)
Air Conditioner Service Manual
25
Pressure Gauge
A) The pressure gauges should be calibrated regularly.
B) The pressure gauge used for Refrigerant 22 can be used for Refrigerants R290
and R161; the pressure gauge used for R410A can be used for Refrigerant 32.
Fire Extinguisher
It is necessary to carry fire extinguisher(s) when installing and maintaining an air
conditioner. On the maintenance site, there should be two or more kinds of dry
powder, carbon dioxide and foam fire extinguishers and that such fire extinguishers
should be placed at stipulated positions, with eye-catching labels and in handy
places.
Maintenance
1). Inspections before maintenance.
(1) Inspection of maintenance environment
There should be no leaked refrigerant in the room before operation.
It is only allowed to operate in a room which meets the area requirement on the nameplate.
It is necessary to make the room keep a continuous ventilation state at the time of maintenance.
The room in the maintenance should be free from fire or welding, smoking, drying oven or any other goods
temperature higher than 370
℃
(R290)/548
℃
(R32) which easily produces fire.
During the maintenance, it is necessary to ensure that any person’s any mobile phone or any electronic
product with radiation in the room is powered off.
The maintenance area should be equipped with a drying powder or carbon dioxide fire extinguisher and
that such fire extinguisher can work.
(2) Inspection of maintenance equipment
Check the maintenance equipment is applicable to the refrigerant or not and it is only allowed to use the
professional equipment recommended by the air conditioner manufacturer.
Check the refrigerant leak detector whether has been calibrated. The set maximum alarm concentration
of the refrigerant leak detector should not exceed 25% of the lower explosion limit (LEL), the refrigerant
leak detector must be working during maintenance.
2) Inspection of air conditioner
It is necessary to ensure that the air conditioner is in reliable ground connection before maintenance.
Make sure powered supply to air conditioner is off. Before maintenance, it is necessary to cut off the
power and discharge the capacitor power which used in the air conditioner. If it is a must to need the
power supply during the maintenance, it is necessary to do ongoing leak detection at the most dangerous
position/point in order to avoid potential danger.
Check the warning labels on the air conditioner whether are in good condition. It is necessary to replace
the damaged or smeared warning labels.
3). Leak inspection before maintenance
Before maintenance, use the leak detector or concentration detector (pump-type) recommended by
the corresponding air conditioner manufacturer to check the air conditioner leak or not.
Warning
If leak may exist, it is necessary to move all the fire out from the site or extinguish fire and then
immediately shut off the air conditioner. Meanwhile, it is necessary to make sure well-ventilated.
4). Safety principles during the maintenance
At the time of maintenance, it is necessary to ensure well-ventilation on the site.
It is prohibited to use fire including welding, smoking or other purposes. It is prohibited to use mobile
phones.
