D.C. Inverter Multi VRF Modular
31
Suppose that A (Quantity of refrigerant added to connection pipe) =
∑
Length of liquid pipe x
Quantity of refrigerant added to liquid pipe per meter) = 5kg
R (Quantity of added refrigerant in total) = 5+0=5kg
After confirming that there is no leakage from the system, when the compressor is not in
operation, charge additional R410A with specified amount to the unit through the filling opening of
the liquid pipe valve of the outdoor unit. If required additional refrigerant can not be quickly filled for
increase of pressure in the pipe, set the unit at cooling startup and then fill the refrigerant from gas
valve of outdoor unit. If ambient temperature is low, the unit can’t be set to cooling mode but
heating mode.
4.5 Electric Wiring
4.5.1 Wiring precautions
Wiring should conform to national rules. All the parts, materials, electric work should be in
accordance with local codes.
Rated voltage and exclusive power supply should be used.
Power cord should be fixed soundly and reliable. Never forcibly pull the power cord.
Wire size of power cord should be large enough. The damaged power cord and connecting
wire should be replaced by exclusive cable.
All the electrical work should be performed by professional personnel as per local law,
regulation and this manual.
Connect the unit to the special earthing device and make sure the unit is earthed soundly.
Circuit breaker and circuit breaker is required to be set. Circuit breaker should have both
magnetic trip and thermal trip functions so as to protect the unit when short-circuit and
overload happens. D-type breaker is adviced to be used.
Wiring diagram attatched on the unit is prevailed.
4.5.2 Wiring of power cord
Every unit should have corresponding short-circuit and overload protection. And also a main
switch is required to control power supply or disconnection. See Fig.37.
Fig.37
Please refer to the following table for circuit breaker and circuit breaker for modular outdoor
units. 5-core cable is used and the wire size unit is mm
2
.
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