AUX-DC inverter ARV outdoor unit individual series technical manual
108
4. Additional refrigerant
4.1 Operation procedure
Calculate the required refrigerant volume by the length of liquid pipe → recharge refrigerant.
Additional refrigerant charge volume =
(
L1×0.52
)
+
(
L2×0.34
)
+
(
L3×0.25
)
+
(
L4×0.17
)
+
(
L5×0.11
)
+
(
L6×0.054
)
+
(
L7×0.022
)
4.2 Steps for recharging refrigerant
1. Make sure vacuum drying is qualified before recharging refrigerant.
2. Calculate the required refrigerant volume by the diameter and the length of liquid pipe.
3. Use electronic scale or fluid infusion apparatus to weigh the recharged refrigerant volume.
4. Use soft pipe to connect refrigerant cylinder, pressure gauge, and examine valve of outdoor unit. And
recharge in liquid mode. Before recharging, clear the air in the so
ft pipe and pressure gauge’s pipe.
5. After recharge is finished, using gas leak detector or soap water, inspect for refrigerant leakage in
expansionpart of indoor and outdoor units.
Caution
The recharged refrigerant volume must be calculated according to the formula in the outdoor
technicalreference manual. Calculation cannot be made according to running current, pressure and
temperature ascurrent and pressure will change depending on the difference of temperature and
length of pipeline.
The calculation result must be recorded for reference (Better to make a table);
In cold temperature, use warm water and hot air to warm up refrigerant storage cylinder.
Charge the additional refrigerant from the gas pipe or liquid pipe. After the system is running, if it is
neededto charge refrigerant during maintenance, charge at the gauge point.
4.3 Recharging R410A refrigerant
If R410A refrigerant is adopted, confirm the following items before recharging,
1. R410A refrigerant compatible vacuum pump with one-way valve.
2. R410A refrigerant compatible pressure gauge.
3. R410A refrigerant compatible recharging soft pipe and connector.
4. Charging method: Recharge in liquid phase.
Pipe size of liquid side
(mm)
L1
Ф25.4
L2
Ф22.22
L3
Ф19.05
L4
Ф15.88
L5
Ф12.7
L6
Ф9.52
L7
Ф6.35
Additional refrigerant
charge per meter (kg)
0.52
0.34
0.25
0.17
0.11
0.054
0.022
Содержание ANB66FVAMT
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