Hitachi RAS-8FSXNS2E Installation & Operation Manual page 48

◆ air365 Max Pro scenarios
Model Gas Ø High / Low
ID22.2
RAS-5FSXNP2E
→OD15.88
ID22.2
RAS-6FSXNP2E
→OD19.05
ID22.2
RAS-8FSXNP2E
→OD19.05
RAS-10FSXNP2E
ID22.2
RAS-12FSXNP2E
→OD25.4
ID22.2
RAS-14FSXNP2E
→OD25.4
ID25.4
RAS-16FSXNP2E
→OD28.58
ID25.4
RAS-18FSXNP2E
→OD28.58
3.5 Air-Tight Test
1 Check to ensure that spindles of the stop valves for High/Low pressure gas, Low pressure gas
and Liquid pipes are closed completely before air-tight test.
2 The refrigerant used for this outdoor unit is R410A only. Use the manifold gauge and the
charging hose for exclusive use of R410A.
3.5.1 Tightening check of stop valves
After connecting the pipe, remove the caps of stop valves for high/low pressure gas, low pressure
gas (for heat recovery system only) and liquid. Tighten the open-close spindle in the closing
direction according to the following tightening torque.
1 Remove the stop valve caps before performing the airtight test after connecting the refrigerant
piping. Tighten the spindle (valve) in clockwise direction according to the following tightening
torque.
2 Perform the work after warming the spindle part with a dryer etc. when controlling the stop
valve in a cold area. O-ring of the spindle part will harden at the low temperature and the
refrigerant leakage may occur.
3 Do not apply an excessive force after fully opening the spindle. (Tightening Torque: < 5.0N.m)
The back seat is not provided.
4 When each valve is opened, remove tags "Close" (Accessories) and attach tags "Open" instead.
PMML0628 rev.0 - 05/2023
2 pipes system
Liquid Ø
B C
-
-
ID12.7
→OD9.52
ID12.7
-
→OD9.52
-
-
OD15.88
→OD12.7
-
3 pipes system
Gas Ø
High / Low
Low pressure
pressure
A B
ID22.2 ID22.2
→OD15.88 →OD12.7
ID22.2 ID22.2
→OD19.05 →OD15.88
ID25.4 ID22.2
→OD19.05 →OD15.88
ID25.4 ID22.2
→OD22.2 →OD19.05
- -
- -
ID25.4
-
→OD22.2
ID25.4
-
→OD22.2
Liquid Ø
C
-
-
ID12.7
→OD9.52
ID12.7
→OD9.52
-
-
OD15.88
→OD12.7
-
3
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