Charging Additional Refrigerant - Mitsubishi Electric City Multi PURY-HP-TNU-A Série Manuel D'installation

a: ø3/8; 32 ft
b: ø3/8; 16 ft
c: ø1/4; 16 ft
d: ø1/4; 32 ft
e: ø1/4; 16 ft
f: ø3/8; 16 ft
g: ø3/8; 16 ft
h: ø3/8; 16 ft
The total length of the high-pressure piping and liquid piping in each case is as follows:
ø1-1/8 total length: 131 (A)
ø3/4 total length: 9 (A ) + 3 (A
1
ø3/8 total length: 32 (B) + 16 (C) + 16 (D) + 16 (E) + 16 (F) + 16 (G) + 16 (H) + 16 (I) + 32 (a) + 16 (b) + 16 (f)
+ 16 (g) + 16 (h) = 240
ø1/4 total length: 16 (c) + 32 (d) + 16 (e) = 64
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 = (131 × 3.54) + (12 × 1.51) + (240 × 0.59) + (64 × 0.23) + 106 + (15 × 4) + 177

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)
ø9.52 (ø3/8)
ø12.7 (ø1/2)
ø15.88 (ø5/8)
ø19.05 (ø3/4)
ø25.4 (ø1)
ø28.58 (ø1-1/8)
・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.
・After evacuation and refrigerant charging, ensure that the service valves are fully open. Do not operate the unit with the service valves closed.
WT09112X02
) = 12
2
= 981.2 oz (Fractions are rounded up.)
Shaft (N·m) Size of hexagonal wrench [mm (in)]
15 6
20 9
25 15
25 30
25 30
25 -
Service port cap (N·m)
4 (3/16)
4 (3/16)
6 (1/4)
6 (1/4)
10 (7/16)
-
GB-28
12
16
Ⓐ
Siphon pipe
Ⓐ