Mitsubishi Electric CITY MULTI PUHY-P-ZKMU-A Installation Manual page 15

Satisfy the minimum insertion depth in the table below when expanding on-site
piping
Pipe diameter
(mm [in])
5 [7/32] or more, less than 8 [11/32]
8 [11/32] or more, less than 12 [1/2]
12 [1/2] or more, less than 16 [21/32]
16 [21/32] or more, less than 25 [1]
25 [1] or more, less than 35 [1-13/32]
35 [1-13/32] or more, less than 45 [1-25/32]
After evacuation and refrigerant charging, ensure that the handle is fully
open. If operating with the valve closed, abnormal pressure will be imparted
to the high- or low-pressure side of the refrigerant circuit, giving damage to
the compressor, four-way valve, etc.
Determine the amount of additional refrigerant charge by using the formula,
and charge refrigerant additionally through the service port after completing
evacuation.
After completing work, tighten the service port and cap securely so as not to
generate any gas leakage. (Refer to the table on the below for appropriate
tightening torque.)
Appropriate tightening torque:
Outer diameter
Cap
of copper pipe
(N·m/kg·cm) (N·m/kg·cm)
(mm [in])
ø9.52 [3/8] 15/150
ø12.7 [1/2] 20/200
ø15.88 [5/8] 25/250
ø19.05 [3/4] 25/250
ø25.4 [1] 25/250
ø28.58 [1-1/8] 25/250
Caution:
Keep the valve closed until refrigerant charging to the pipes to be
added on site has been completed. Opening the valve before charging
the refrigerant may cause damage to the unit.
Do not use a leak detection additive.
[Fig. 10.2.3]
A B
Caution:
Make sure to seal-off the openings for the pipe and wire retrieval.
Small animals, rainwater, or snow entering through the openings may
cause damage to the device.
Minimum insertion depth
(mm [in])
6 [1/4]
7 [9/32]
8 [11/32]
10 [13/32]
12 [1/2]
14 [9/16]
Size of
Shaft Service port
hexagonal
(N·m/kg·cm)
wrench (mm)
6/60 4
9/90 4
15/150 6 12/120
30/300 6
30/300 10
- - 16/160
A Example of closure materials
B Fill the gap at the site
Make sure to seal-off the space around
areas where the wires and refrigerant
pipes enter the unit to ensure that small
animals, rainwater, or snow cannot
enter the unit through such openings
and cause damage to the unit.
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