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INSTALLATION OF REFRIGERANT PIPES
Serial No.
Diameter (inch)
Length (m)
L1
0.375
20
L2
0.375
10
L4
0.375
10
1A
0.25
5
NO.
1
2
3
4
Liquid side
Gas side
Service port
Name Outdoor unit
stop valve
stop valve
When the liquid and gas stop valves have not been opened, the system is under the vacuum:
1) Refer to the left of the Fig. 20, connect the R410A tank to the system.
2) Turn on the R410A tank and the Hi-knob, charge the R410A refrigerant into the system from the liquid side
stop valve. The Lo-knob should be closed completely.
3) Turn off the R410A tank and the Hi-knob immediately, when the adding refrigerant is enough.
4) Turn on the liquid and gas side stop valves in an anticlockwise direction slowly and completely.
If the pressure of the system is too high to charge refrigerant, you can do as follow:
1) Turn on the liquid and gas side stop valves in an anticlockwise direction slowly and completely.
2) Turn on the power of the air conditioner, and set cooling mode, running more than 0.5h when outside
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temperature is higher than 59 F DB.
a) Refer to the left of the Fig. 20, connect the R410A tank to the system.
b) Turn on the R410A tank and the Lo-knob, charge the R410A refrigerant into the system from the gas side stop
valve. The Hi-knob should be closed completely.
c) Turn off the R410A tank and the Lo-knob immediately, when adding refrigerant is enough.
3) Turn on the power of the air conditioner, and set heating mode, running more than 0.5h when outside
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temperature is lower than 59 F DB.
a) Refer to the right of the Fig. 20, connect the R410A tank to the system.
b) Turn on the R410A tank and the Hi-knob, charge the R410A refrigerant into the system from service port. The
Lo-knob should be closed completely.
c) Turn off the R410A tank and the Hi-knob immediately, when adding refrigerant is enough.
* Make sure the liquid and gas side stop valves are opened completely after the installation.
* Make sure exact refrigerant charge for the liquid pipe
* Additional refrigerant charge must be measured exactly.
* Make sure charging the liquid refrigerant into the system.
* Please prevent the refrigerant leakage from your body when removing charging hose.
* Please heat the refrigerant tank with hot water or hot air when the outside temperature is too low. However, it
must be forbidden to heat with fire directly, otherwise it may lead to explosion.
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !
1B
0.25
5
1C
0.25
5
2A
0.25
5
2B
0.25
5
2C
0.25
5
5
6
7
8
Pressure-
Hi-knob
Lo-knob
R410A tank
Scale
vacuum gauge
P17 OF 32
WIRING CONNECTION
9
REQUIREMENTS OF POWER CIRCUIT AND CABLE
Note:
* The total length of the transmission line between the outdoor unit and the furthest BU module is not more than
180ft. Otherwise, the system will not work possibility.
* The specifications of the power cable and transmission line listed in the table above are determined based on
the maximum power (maximum amps) of the unit.
* The specifications of the power cable listed in the table above are applied to the conduit-guarded multi-wire
copper cable (like, YJV copper cable, consisting of PE insulated wires and a PVC cable jacket) used at 104 F
and resistible to 194 F. If the working condition changes, they should be modified according to the related
national standard.
* The specifications of the air switch listed in the table above are applied to the breaker with the working
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temperature at 104 F. If the working condition changes, they should be modified according to the related national
standard.
* The length of the recommended power cable should be less than 15 meters; otherwise, the diameter of the
power cable is not enough.
* Mentioned power cable and transmission line length is just a reference value. It may be different depending on
the condition of installation, humidity or materials, etc.
GROUND REQUIREMENTS
* The air conditioner is classified as a Class I appliances, so its ground ways must be reliable.
* The ground wire must be fixed on the screw hole with the sign as the right figure.
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !
ELECTRICAL WIRING WORK
The "L1", "3" terminals are connected to the live wire, the "L2", "N(1)" terminals
are connected to the neutral wire and the "2" terminal is connected to the
transmission line.
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P18 OF 32
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