6.7.3
Connecting the refrigerant connections to the outdoor
unit
1. Remove the protective side panels from the outdoor unit.
2. Unscrew the nuts on the stop valves.
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.
3. Thread 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.
Caution
Keep the refrigerant connection in place on the outdoor unit with a
spanner so as not to twist the internal pipe.
Tab.24 Torque load
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
6.7.4
Adding the necessary quantity of refrigerant fluid
If the refrigerant connection pipes exceed the lengths below, add
refrigerant fluid via the refrigerant fluid stop valve using a safety loader.
Caution
Prevent oil traps.
If the pipes are not connected immediately, plug them to prevent
moisture from entering.
Tab.25 Quantity of refrigerant fluid to be added
Length of refrigeration 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.32
MW-5000512-2
Fig.33
MW-1001302-2
(1)
(2)
(2)
6 Installation
34
7762758 - v05 - 19082020
