R410A 50Hz Tropical Split AC MCAC-UTSM-2012-12
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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.
In order to prevent disoperation of the air conditioner, do not interleave or entwine the power cable
(380~415V/3N/50Hz) with the connection wires (low-voltage wires) of the indoor/outdoor unit.
Power on the indoor unit after performing the airtight test and making a vacuum.
7). Trial run
Perform the trial run only after the outdoor unit has been powered on for over 12 hours.
3.2 Installation Space
When installing the unit, leave a space for maintenance shown in the following figure. Install the power
supply at the side of the outdoor unit.
Ensure enough space for installation and maintenance. (Fig-14 and Fig-15)
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