Service manual

54
5�2 Refrigerant Charging and Trial Running
a. Refrigerant Charging
1) The refrigerant has been charged into the outdoor unit before shipment, while additional refrigerant still need be
charged into the refrigerant pipe during the eld installation.
2) Check if the liquid valve and the gas valve of the outdoor unit are closed fully.
3) As shown in the following gure, expel the gas inside the indoor unit and refrigerant pipe out by the vacuum
pump.
“LO” knob
Manometer
Manometer
“HI” knob
Vacuum pump
Hose
Gas Valve
4) When the compress is not running, charge the R410A refrigerant into the refrigerant pipe from the liquid valve of
the outdoor unit (do not do it from the gas valve)
b. Calculation of the Additional Refrigerant Charge
1) Refrigerant Charge in the Outdoor Unit before Shipment
Model MC-E36AI MC-E42AI
Refrigerant Charge (kg) 3.6 4.8
Notes
：
a. The refrigerant charge mentioned in the table above is not included those charged additionally in the indoor unit
and the refrigerant pipe.
b. The amount of the additional refrigerant charge is dependent on the diameter and length of the liquid refrigerant
pipe which is decided by the actual yield installation requirement.
c. Record the additional refrigerant charge for future maintenance.
2) Calculation of the Additional Refrigerant Charge
If the total refrigerant pipe length (liquid pipe) is smaller than that listed in the table below, no additional refrigerant
will be charged.
Model Total Liquid Pipe Lenght (a+b+c+d+e)
MC-E36AI
≤
40m
MC-E42AI
≤
50m
Additional Refrigerant Charge2=∑Extra Liquid Pipe Length×22g/m
(
liquid pipe 1/4''
).
Note: if the total refrigerant pipe length is larger than that listed in the table above, the additional refrigerant for the
extra length of the pipe needs to be charged as per 22g/m.
3) Example : MC-E42AI
a
b
c
d
e
Indoor Unit
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