Air Conditioner Service Manual
15
6) Make sure no foreign objects are left in the unit after finishing installation.
Improper installation may lead to fire hazard, explosion, electric shock or injury.
Safety precautions for Installing and Relocating the unit.
To ensure safety, please be mindful of the following precautions.
Warnings
When installing or relocating the unit, be sure to keep the refrigerant circuit free from air or substances other than the specified
refrigerant.
Any presence of air or other foreign substance in the refrigerant circuit will cause system pressure rise or compressor rupture,
resulting in injury.
When installing or moving this unit, do not charge the refrigerant which is not comply with that on the nameplate or unqualified
refrigerant.
Otherwise, it may cause abnormal operation, wrong action, mechanical malfunction or even series safety accident.
When refrigerant needs to be recovered during relocating or repairing the unit, be sure that the unit is running in cooling mode.
Then, fully close the valve at high pressure side (two-way valve). About 30-40 seconds later, fully close the valve at low pressure
side (3-way valve), immediately stop the unit and disconnect power. Please note that the time for refrigerant recover should
not exceed 1 minute.
If refrigerant recovery takes too much time, may be cause compressor overheat, resulting in injury.
During refrigerant recovery, make sure that two-way valve and 3-way valve are fully closed and power is disconnected before
detaching the connecting pipe.
If compressor starts running when the valves is open and connecting pipe is not yet connected, air will be sucked in and cause
pressure rise and then compressor overheat or gas leak, resulting in injury.
When installing the unit, make sure that connecting pipe is securely connected before the compressor starts running.
If compressor starts running when the valves is open and connecting pipe is not yet connected, air will be sucked in and cause
pressure rise and then compressor overheat or gas leak, resulting in injury.
Prohibit installing the unit at the place where there may be leaked corrosive gas or flammable gas.
If there leaked gas around the unit, it may cause explosion and other accidents.
Do not use extension cords for electrical connections. If the electric wire is not long enough, please contact a local service
center authorized and ask for a proper electric wire.
Poor connection may lead to electric shock or fire.
Use the specified types of wires for electrical connections between the indoor and outdoor units. Firmly clamp the wires so
that their terminals receive no external stresses.
Electric wires with insufficient capacity, wrong wire connections and insecure wire terminals may cause electric shock or fire.
Introduction R32, R290 air conditioner installation
Introduction to Refrigerants R32 & R290
The refrigerants used for air conditioners are environmentally friendly hydrocarbons R32 and R290. The two
kinds of refrigerants are combustible and odorless. Moreover, they can burn and explode under certain condition.
However, there will be no risk of burning and explosion if you comply with the following table to install your air
conditioner in a room with an appropriate area and use it correctly.
Compared with ordinary refrigerants, Refrigerants R32 & R290 are environmentally friendly and do not destroy
the ozone sphere and that their values of greenhouse effect are also very low.
R32/R290 air conditioner installation area requirement
m1=(4m
3
)×LFL, m2=(26m
3
) ×LFL, m3=(130m
3
) ×LFL
Where LFL is the lower flammable limit in kg/m
3
, R290 LFL is 0.038kg/m
3
, R32 LFL is 0.306kg/m
3
.
For the appliances with a charge amount m1<M<m2:
The maximum charge in a room shall be in accordance with the flowing: M
max
=2.5×(LFL)
(5/4)
×h
0
×A
1/2
The required minimum floor area A
min
to install an appliance with refrigerant charge M(kg) shall be in
accordance with following: A
min
= (M/ (2.5 x (LFL)
(5/4)
x h
0
)) 2
Where:
M
max
is the allowable maximum charge in a room, in kg;
M is the refrigerant charge amount in appliance, in kg;
A
min
is the required minimum room area, in m2;
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