Airwell KXV Series, Инструкция по эксплуатации

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Engineering manual
225
Indoor unit tubing connection
Indoor unit type
007 009 012 015 018 021 024
030 036
Gas tubing(mm) Φ 12.7 Φ 15.88
Liquid tubing(mm) Φ 6.35 Φ 9.52
Table 3-6 Indoor unit tubing connection (l1, l2…ln-1)
1.4.9 Additional Refrigerant Charge

Refrigerant Charge Amount at shipment (for outdoor unit)
YAV112 YAV140
Heat Pump Unit (kg)
4.5 5.5

According the refrigerant pipe length and dimension, we need charge additional refrigerant.
The required additional refrigerant charge (kg) =
（
25×a+55×b+120×c
）
×
10
-3
a: Total length of Φ 6.35 (m) liquid tube
b: Total length of Φ 9.52(m) liquid tube
c: Total length of Φ 12.7(m) liquid tube.
1.4.10 Leakage test
After the refrigerant piping has finished, execute a leakage test. For a leakage test, connect a nitrogen gas bomb as shown
in the figure blow, and apply pressure.

Be sure to apply pressure from the service ports of the packed valves (or ball valves) at liquid side, discharge gas
side, and suction gas side.

An air tight test can be only performed to the service ports at liquid side, discharge gas side, and suction gas side of
the outdoor unit.

Close fully valves at liquid side, discharge gas side, and suction gas side. As there is possibility that nitrogen gas
enters in the refrigerant cycle, re-tighten the valve rods before applying pressure.
(Re-tightening of the valve rods are unnecessary for valves at discharge gas side because they are ball vales.)

For each refrigerant line, apply pressure gradually with steps at liquid side, discharge gas side, and suction gas side.
WARNING

Be sure to apply pressure to suction gas side, discharge gas side, and liquid side.

Never use “Oxygen”, “Flammable gas” and “Noxious gas” in an leakage test.
Table 3-7