Midea Tropical R410A High Efficient Duct Technical Manual 50Hz MCAC-UTSM-201707
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Repair the leak and test again.
To verify that the system has no leaks, simply close the valve to the vacuum pump suction
to isolate the pump and hold the system under vacuum. Watch the micron gauge for a few
minutes. If the micron gauge indicates a steady and continuous rise, it is an indication of a
leak. If the gauge shows a rise, then levels off after a few minutes and remains fairly
constant, its an indication that the system is leak free but still contains moisture and may
require further evacuation if the reading is above 350 microns.
After vacuum, according to the diameter and length of the connective pipe of liquid side between
the indoor unit and outdoor unit, calculate the refrigerant replenishment quantity. The refrigerant
for replenishment is R410A.
Notes:
Please check and record the replenished quantity of the air conditioner.
5. Heat Insulation of Refrigerant Pipe
In order to prevent faults caused by condensate of the refrigerant pipe and drain pipe, perform
condensate prevention and heat insulation properly. If it is forecast that high humidity and
temperature environment (Condensate temperature is over 23°C ) may exist in the ceiling, e.g., inside
the ceiling with slab, ceiling which is in the same environment as the outdoor air. It is necessary to
apply 10mm or thicker adiabatic wool (16~20kg/m
2
) to the refrigerant pipe and the drain pipe in
addition to applying the general heat insulation materials. Enough heat insulation materials should
also be applied to the refrigerant joint and the pipe joint.
Notes: The heat insulation of drain pipe refers to the installation of indoor unit.
Please use heat-resistant materials as heat insulation material of the air-side pipe. (e.g., EPT)
Cover heat insulation materials separately at the liquid side and the air side. Moreover, perform
heat insulation thoroughly for the air-side pipes of the indoor unit, and prevent water from
dripping outside the unit.
After applying the auxiliary heat insulation materials, use vinyl resin tape to seal refrigerant pipe
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