Gree GMV MTAC VRF Series, Service Manual

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Gree GMV MTAC VRF for North America
76
NOTICE!
Liquid pipe that is within 20m(65-5/8feet) doesn’t need to be added with refrigerant.
First confirm that there is no leakage from the system. When compressor is not working,
charge additional R410a with specific amount to the unit through the filling opening of the liquid
pipe valve of the outdoor unit. If required amount cannot be quickly filled due to pressure increase
of the pipe, then set the unit in cooling startup and fill refrigerant from the low pressure check valve
of the outdoor unit.
(3) Calculation example.
IDU:
No.
IDU
①
IDU
②
Model Wall-mounted type GMV-ND06G/B4B-T(U) Wall-mounted type GMV-ND06G/B4B-T(U)
Liquid pipe:
No. A a b
Pipe size(mm/inch) Φ6.35(Φ1/4) Φ6.35(Φ1/4) Φ6.35(Φ1/4)
Length(m/feet) 5(16-3/8) 5(16-3/8) 5(16-3/8)
Total length of each liquid pipe
Φ6.35: A+b+a =5+5+5=15m (49-1/8feet)
Quantity of indoor unit: 2 sets
Therefore, the minimum quantity of additional refrigerant =0.2×2+15×0.022=0.73kg(25.7oz)
7 Electric Wiring
(1) All electrical installation must be performed by qualified technicians in accordance with local laws, regulations
and this user manual.
(2) Use air conditioner specialized power supply and make sure that it is consistent with system’s rated voltage.
(3) Do not pull the power cord with force.
(4) Caliber of the power cord must be large enough. A damaged power cord or connection wire must be replaced
by specialized electrical cords.
(5) Connect the unit to specialized grounding device and make sure it is securely grounded. It’s a must to install air
switch and current circuit breaker that can cut off the power of the entire system. The air switch should include
magnetic trip function and thermal trip function so that system can be protected from short circuit and overload.
(6) Air conditioner belongs to class I electrical appliance, so it must be securely grounded.
(7) The yellow-green wire inside the unit is a ground wire. Do not cut it off or secure it with tapping screws,
otherwise it will lead to electric shock.
(8) Power supply must include secure grounding terminal. Do not connect the ground wire to the following:
①
Water pipe;
②
Gas pipe;
③
Drain pipe;
④
Other places that are deemed as not secure by professional
technicians.