Vivax ACP-48COFM140GEEI, User Manual

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6.8
Vacuum Operation
1) Make sure that the liquid and gas stop valve of the outdoor unit are closed fully during the
operation.
2)
As shown in the following figure, expel the gas from the refrigerant pipes by the vacuum
pump.
1: Outdoor unit
2: Service port
3: Liquid side stop valve
4: Gas side stop valve
5: Pressure-vacuum gauge
6: Hi-knob
7: Lo-knob
8: Vacuum pump
3)
Open the pump and turn on the knobs to
evacuate the gas in the liquid and gas pipes.
4)
When the pressure of the system is less than -0.1Mpa (-1bar), keep the system for more than
one hour under the condition.
5)
Then turn off the knobs and the pump, and if the pressure of the pressure-vacuum gauge
does not rise within 2 hours, the system is under a vacuum. Otherwise, the system has
leaked, please look for where the gas leaks in.
6.9
Refrigerant Charging
6.9.1 The refrigerant has been charged into the outdoor unit before shipped from the
manufacturer, while additional refrigerant still need be charged into the refrigerant pipe
during the field installation.
6.9.2 Calculation of the Additional Refrigerant Charging
1) Get the refrigerant charge of the outdoor unit from the nameplate.
Note:
♦
The refrigerant charge of the outdoor unit does not include the charged additionally in the
indoor unit, BU module and the refrigerant pipe.
♦
For the length of the connecting pipe is decided on the field, the amount of additional
refrigerant shall be decided depending on the dimension and the length of the liquid pipe
used on the field.
♦
Record the additional refrigerant charge for future maintenance.
♦
It does not need to add refrigerant if the total length of liquid pipe is within 30m.
2) Calculating the Mass of Additional Refrigerant
Additional Refrigerant Charge (kg) =
Σ
the Liquid Pipe Length of
Φ6.35x0.022kg/m +
Σ
the
Liquid Pipe Length of
Φ9.52x0.054kg/m-1.47(kg)
♦
If the additional refrigerant charge is negative, it does not need to add the refrigerant.