Charging Additional Refrigerant - Mitsubishi Electric CITY MULTI PUHY-P72TNU-A Manual De Instalación

B : ø3/8; 32 ft
C : ø3/8; 49 ft
D : ø3/8; 32 ft
a : ø3/8; 32 ft
b : ø3/8; 16 ft
c : ø1/4; 32 ft
d : ø1/4; 32 ft
e : ø3/8; 32 ft
The total length of each liquid piping is as follows:
ø1/2 total length: 131 (A)
ø3/8 total length: 32 (B) + 49 (C) + 32 (D) + 32 (a) + 16 (b) + 32 (e) = 193
ø1/4 total length: 32 (c) + 32 (d) = 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 × 1.19) + (193 × 0.58) + (64 × 0.23) + 0 + 124

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.
<Notice>
・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)
ø22.2 (ø7/8)
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.
WT09452X01
= 406.6 oz (Fractions are rounded up.)
Service port cap (N·m)
25
30 14
35
24.5 18
GB-41
Ⓐ
Ⓐ Siphon pipe