iAIRE, LLC
SHVAC
Residential Mini-Split and Mounting Kit I/O/M
56
9k - 24k Installation and Maintenance (cont’d)
Air Conditioner Service Manual
26
At the time of maintenance, if the relative humidity is lower than 40%, it is necessary to wear anti-
static clothing and gloves.
If the combustible refrigerant is found leaking during the maintenance, it is a must to immediately take
forced ventilation and plug up the leak source.
If the product is damaged to the extent that it is a must to open the refrigerating system for
maintenance, it is a must to carry the product back to the maintenance station for maintenance. (It is
prohibited to weld the refrigerant pipe and do other operations on the user’s site.)
It is necessary to return the air conditioner to its initial state if it is necessary to provide visiting service
again due to lacking spare part during the maintenance. Moreover, it is a must to ensure that the
refrigerating system is in secure ground connection.
If it is necessary to provide visiting service with a refrigerant cylinder, the volume of refrigerant filled in
such refrigerant cylinder should not exceed the stipulated value. When such cylinder is stored in a
vehicle or placed on the installation or maintenance site, it is necessary to place it vertically and
securely and keep it away from any place where there is any heat source, combustion source,
radiation source or electrical equipment.
5). Requirements for the site of maintenance-station
The maintenance location should be well-ventilated, with leveled ground and not in a basement.
The maintenance should be divided into welding and non-welding areas both of which should be
labeled clearly. There should be a certain safety distance between the two areas. The maintenance
location should be equipped with ventilating and air-exhausting equipment to prevent the refrigerant
gas from aggregating.
It is necessary to provide some relevant instruments such as combustible refrigerant leak detector
and have a leak detecting instrument management system. It is necessary to confirm that the leak
detector can work normally before maintenance.
The main power switch should be set outside the maintenance location and equipped with protective
(explosion-proof) devices.
It is necessary to provide firefighting devices such as dry powder or carbon dioxide fire extinguisher
appropriate for extinguishing the electrical fire and keep such firefighting devices in a usable
condition.
Temporary wires and sockets are prohibited on the maintenance location.
6). Requirements for fill the refrigerants
It is necessary to use nitrogen to clear the cyclic system before operating the refrigerating system and
vacuumize the outdoor unit for 30 minutes at least.
It is necessary to ensure that there is no cross contamination among different refrigerants when the
refrigerant filling device is used. The total length including the refrigerant pipeline should be as short
as possible in order to reduce the residual refrigerant inside such pipeline.
It is necessary to vertically place the refrigerant storage tanks.
It is necessary to ensure that the refrigerating system is in ground connection before the refrigerant is
filled.
When filling the refrigerant, it is necessary to fill corresponding type and volume of refrigerant as per
the requirements on the product nameplate and overfilling is prohibited.
It is necessary to seal the system in a safe sealing way after maintaining the refrigerating system.
It is necessary to ensure that the maintenance will not damage or reduce the safety protection grade
of the original system.
7). In-maintenance welding
It is necessary to ensure that the maintenance location is well-ventilated.
Before welding the outdoor unit, it is a must to confirm that the refrigerating system has been drained
