Midea MDFA-76CRN2, Manual

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MCAC-UTSM-12
71

Uncover the screw-cap in the air intake panel, and then lessen the screws.

Take off the air intake panel; ensure which place secure enough will not make risk to the other people.
Fig-13
NOTE:
Please beware of the foot screw, which may be hurt for the pass-by people, make sure enough security of that, prevent accident
occurs.
3. Installation of Outdoor Units
3.1 Important: Construction Checkpoints
1). Installation
Check the model and name to avoid mistaken installation.
2). Refrigerant pipe

The refrigerant pipes must have the specified diameter.

Nitrogen of a certain pressure must be filled into the refrigerant pipe before welding.

The refrigerant pipe must undergo heat insulation treatment.

After the refrigerant pipe is installed completely, the indoor unit cannot be powered on before performing
the airtight test and creating a vacuum.
3). Pressure test
The refrigerant pipe must undergo the airtight test [with 2.94MPa (30kgf/cm
2
G) nitrogen].
4). Creating a vacuum
Be sure to use the vacuum pump to create a vacuum of the connective pipe at both air side and liquid side
concurrently.
5). Refrigerant replenishment

If the pipe is longer than the reference pipe, the refrigerant replenishment quantity for each outdoor unit
should be calculated through the formula obtained according to the actual length of the pipe.

Record the refrigerant replenishment quantity, actual length of pipe and the height difference of the indoor &
outdoor units onto the operation confirmation table (on the electric control box) of the outdoor unit in
advance for future reference.
6). Electric wiring

Select the power supply capacity and wire size according to the design manual. The power wire size of the
air conditioner should be greater than that of ordinary motors.
Put down the air intake panel, before electric connection: