6.6.3
Connecting the refrigerant connections to the outdoor
unit
Caution
Keep the refrigerant connection in place on the outdoor unit with a
spanner so as not to twist the internal pipe.
1 Do not use a spanner on this part of the valve, there is a danger of
the refrigerant leaking.
2 Recommended position of the spanners for tightening the nut.
Tab.22
Association with an out
door unit
Indoor module gas line fitting
Indoor module fluid line fitting
4.5 to 16 kW
Original nut
Original nut
1. Remove the protective side panels from the outdoor unit.
2. Unscrew the nuts on the stop valves.
3. Slip the nuts onto the pipes.
4. Bead the pipes.
5. Apply refrigerant oil to the beaded parts to facilitate tightening and
improve the seal.
6. Connect the pipes and tighten the nuts with a torque wrench.
Tab.23
External diameter of
the pipe (mm/inch)
External diameter of
the cone fitting (mm)
Torque load (N.m)
6.35 - 1/4
17
14 - 18
9.52 - 3/8
22
34 - 42
12.7 - 1/2
26
49 - 61
15.88 - 5/8
29
69 - 82
19.05 - 3/4
36
100 - 120
6.6.4
Quantity of refrigerant fluid to be added
If the refrigerant connection pipes are more than 10 metres long, add more
refrigerant fluid.
Caution
Prevent oil traps.
If the pipes are not connected immediately, plug them to prevent
moisture from entering.
Tab.24 For AWHP 4.5 MR
Length of refrig
eration pipe
7 m
10 m
15 m
20 m
30 m
Yg/m
0
+ 0.045 kg
+ 0.120 kg
+ 0.195 kg
+ 0.345 kg
(1) The outdoor unit is pre-charged with 1.3 kg of refrigerant fluid.
(2) Calculation: Xg = Yg/m x (pipe length (m) – 7)
Fig.41
MW-1001302-1
1
2
2
Fig.42
MW-5000512-2
6 Installation
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AWHP-2 PBS-i
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