R410A Mini Split Chiller 50Hz
MCAC-UTSM-2014-01
54
Caution
Too large torque will harm the bell-mouth and too small will cause leakage. Please determine the torque
according to the table below:
Pipe gauge
Tightening torque
Flare dimension A
Min (mm) Max
Flare shape
Φ6.4
15
～
16N.m
(153
～
163kgf.cm)
8.3
8.7
Φ9.53
25
～
26N.m
(255
～
265kgf.cm)
12.0
12.4
Φ12.7
35
～
36N.m
(357
～
367kgf.cm)
15.4
15.8
Φ15.9
45
～
47N.m
(459
～
480kgf.cm)
18.6
19.0
Φ19.1
65
～
67N.m
(663
～
684kgf.cm)
22.9
23.3
3. How to expel the air
A. Expel the air with refrigerant in outdoor unit: connect the wiring between water pump box and
outdoor unit, refer to the example below:
1. Totally fasten the joint nut of stop valve B and nut C and D.
2. Loosen the joint nut of stop valve A a little.
3. For 3~5m s piping, turn the valve rod of B anticlockwise to 45°for about 6~7seconds. After the air is
expelled from A, fasten the joint nut of stop valve A. (Refer to former page for the torque)
4. Totally open the valve rods of stop valve A and B.
5. Totally fasten the valve bonnet.
B.
Expel the air with vacuum pump (following procedures are for all the Lo-stop valve)
1. Connect the charging hose of the manifold valve with the charging inlet of the Lo-stop valve. (All the
Hi-stop valves should be closed)
2. Connect the connection of charge hose with vacuum pump.
3. Totally open the Lo-lever of the manifold valve.
4. Turn on the vacuum pump. First loosen the joint nut of Lo-stop valve a little to check whether the air
comes in (the noise of vacuum pump changes and the indicator of multi-meter turns to be above 0). Then
fasten the joint nut.
