Mitsubishi Electric CITY MULTI CMB-M-V-J1 Manuel D'installation page 12

Piping length and height between indoor unit and BC controller
100
90
80
70
60
50
40
30
20
10
0 5
Height difference between
the main BC controller and indoor unit (m)
Fig. 1
BC
Sub
Fig. 2
BC
Fig. 1
Indoor Indoor
unit unit
Warning:
(When R32 refrigerant is used)
• Do not use means to accelerate the defrosting process or to clean, other
than those recommended by the manufacturer.
• The unit shall be stored in a room without continuously operating ignition
sources (for example: open flames, an operating gas appliance or an
operating electric heater.)
• Do not pierce or burn.
• Be aware that refrigerants may not contain an odour.
• The unit shall be installed, operated and stored in a room with a floor area
according to the following figure.
• When installing a BC controller, take safety measures in accordance with
the European Standard, based on the system refrigerant amount and the
room volume as shown in the figure below. (The installation restrictions
can be simply found by using the flowchart provided on a separate sheet.)
12
100
90
80
70
60
50
40
30
20
10
10 15 0
Fig. 2
Fig. 2
Sub
BC
Fig. 1 Fig. 1
Indoor
unit
*3
5 10
Height difference between
the main BC controller and indoor unit (m)
*3 When the piping length or the height difference exceeds the restriction
specified in Fig. 1, connect a sub BC controller to the system. The
restriction for a system with a sub BC controller is shown in Fig. 2.
When a given system configuration falls within the shaded area in Fig.
2, increase the size of the high-pressure pipe and the liquid pipe
between the main and sub BC controller by one size. When using
P/M32, P/M40, P/M50, P/M100, or P/M125 model of indoor units,
increase the size of the liquid branch pipe between the sub BC
controller and indoor unit by one size.
When using P/M140 or larger model of indoor units, the restriction
shown in Fig. 1 cannot be exceeded.
80
70
60
50
40
30
20
10
0
0 50
Notes:
• Refer to the outdoor unit manual about additional refrigerant amount of
BC and maximum amount of system refrigerant.
• Be sure to protect pipings from physical damage.
• Do not open the control box cover when charging refrigerant.
- Doing so may cause sparks, resulting in fire.
15
NG (ISO 5149)
At least two safety
measures are
At least one safety
required.
measure is required.
Construction guidance
100 150 200 250 300 350 400 450 500 550 600 650
Room volume [m ]
3