Tadiran Telecom SUV2-H18/1CFA-N Service Manual page 27

CAUTION!
1. Do not wrap the pipe too tightly, otherwise the insulation effect would be weakened. Additionally, make sure the drain
hose is separated from the pipe.
2. After that, fi ll the hole on the wall with sealing material to prevent wind and rain coming into the room.
Refrigerant Charging and Trial Running
● 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 fi 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 fi gure (Fig.5), expel the gas inside the indoor unit and
refrigerant pipe out by the vacuum pump.
4. When the compressor 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).
● Calculation of the Additional Refrigerant Charging
1. Refrigerant Charge in the Outdoor Unit before Shipment
Table 8
Notes:
(1). The refrigerant charge mentioned in the table above is not include those charged additionally in the indoor unit and
the refrigerant pipe.
(2). 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.
(3). 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 listed in the table below, no additional refrigerant will be
charged.
Table 9
SUV2-H18/1CFA-N
SUV3-H24/1CGA-N
SUV4-H28/1CGA-N
SUV4-H36/1CKA-N
SUV5-H42/1CKA-N
Additional refrigerant charge= ∑ Extra Liquid Pipe Length×22g/m (liquid pipe Φ6.35mm)
Notes:
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.
Model
SUV2-H18/1CFA-N
SUV3-H24/1CGA-N
SUV4-H28/1CGA-N
SUV4-H36/1CKA-N
SUV5-H42/1CKA-N
Model
Manometer
"LO" knob
Refrigerant Charge (kg)
1.4
1.9
2.4
3.9
4.0
Total Liquid Pipe Length (a+b+c+d+e)
≤10m
≤30m
≤40m
≤50m
Installation Manual Installation Manual
Manometer
"HI" knob
Hose
vacuum pump
Gas Valve
Fig.5
23