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Flex + Series
14
one hour under the condition.
1: Outdoor unit
2: Liquid side stop valve
3: Gas side stop valve
4: Pressure-vacuum gauge
5: Hi-knob
6: Lo-knob
7: Vacuum pump
Fig. 17
5) Turn off the knobs firstly and then 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.
6.8 Refrigerant Charging
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 in the field installation.
6.8.1 Calculation of the Additional Refrigerant Charging
1) G
et the refrigerant charge of the outdoor unit from the nameplate.
NOTICE
1) The refrigerant charge of the outdoor unit does not include the charged additionally in the indoor unit,
BU module and the refrigerant pipe.
2) 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.
3) It does not need to add refrigerant if the total length of liquid pipe is within 30m (98-3/8feet).
4) Record the amount of additional refrigerant for convenience of future maintenance.
2) Calculating the Mass of Additional Refrigerant
Additional Refrigerant Charge (kg/oz) = Σ the Liquid Pipe Length of Φ6.35 × 0.022kg/m
(0.020oz/inch)+
Σ the Liquid Pipe Length of Φ9.52×0.054kg/m (0.048oz/inch)-1.47kg(51.86oz)
NOTICE! If the additional refrigerant charge is negative, it does not need to add refrigerant.
3) Example:
GWHD(56S)ND3CO
Fig. 18
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