27
VG79D920H01
en
<Example>
Outdoor unit model: m-MOCU-G02-050 ×
2
Total capacity of connected indoor units: 44 kW < Total capacity ≤ 54 kW
* Refer to the pipe connection examples in section 9-4 for the pipes marked with the letters below.
A: ø15.88; 40 m
B: ø19.05; 10 m
C: ø19.05; 15 m
D: ø15.88; 10 m
a: ø12.7; 10 m
b: ø12.7; 5 m
c: ø12.7; 10 m
d: ø12.7; 10 m
e: ø12.7; 10 m
The total length of each liquid piping is as follows:
ø19.05 total length: 10 (B) + 15 (C) = 25
ø15.88 total length: 40 (A) + 10 (D) = 50
ø12.7 total length: 10 (a) + 5 (b) + 10 (c) + 10 (d) + 10 (e)= 45
Therefore, when the piping length from the outdoor unit to the farthest indoor unit is longer than 30.5 m (100 ft),
Amount of additional charge = (25 × 0.26) + (50 × 0.18) + (45 × 0.11) + 6.0 × 2 + 4.5
= 37.0 kg (Fractions are rounded up.)
9-9-2. Charging additional refrigerant
Charge the calculated amount of refrigerant in the liquid state to the unit through the service port after the completion
of piping work. Upon completion of all work, securely tighten all service port caps and shaft caps to prevent refrigerant
leakage.
・
Do not vent the refrigerant into the atmosphere.
・
Refer to the table below for the appropriate tightening torque.
Pipe size [mm (in)]
Shaft cap (N·m)
Shaft (N·m)
Size of hexagonal wrench [mm (in)]
Service port cap (N·m)
ø9.52 (ø3/8)
22
6
4 (3/16)
12
ø12.7 (ø1/2)
27
10
4 (3/16)
ø15.88 (ø5/8)
32
12
4 (3/16)
ø19.05 (ø3/4)
50
30
8 (3/8)
ø25.4 (ø1)
50
30
8 (3/8)
ø28.58 (ø1-1/8)
22
-
-
16
・
If the refrigerant tank does not have a siphon pipe, charge the liquid refrigerant with the tank upside-down as shown
in the figure below.
Ⓐ
Ⓐ
Siphon pipe
・
After evacuation and refrigerant charging, ensure that the service valves are fully open. Do not operate the unit
with the service valves closed.
