Installation Restrictions; Outdoor Units; Hbc Controllers - Mitsubishi Electric HYBRID CITY MULTI PURY-M200-300YNW-A Data Book

2. Installation restrictions

2. Installation restrictions
Observe the following restrictions that apply to the installation of units.

2-1. Outdoor units

 R32 is heavier than air—as well as other refrigerants—so tends to accumulate at the base (in the vicinity of the floor). If R32
accumulates around the base, it may reach a flammable concentration in case the room is small. To avoid ignition, maintain a
safe work environment by ensuring appropriate ventilation. If the refrigerant leaks in a room or an area that has insufficient
ventilation, refrain from using flames until the work environment is improved by ensuring appropriate ventilation.
 Do not install the outdoor unit in a semibasement, basement, or machinery room, where the refrigerant remains in the room
when it leaks out.
 Install the outdoor unit in a space where at least one side is open.
Good
Figure 1
NG
(Example: semibasement, basement)

2-2. HBC controllers

 When installing an HBC 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 2. (The installation restrictions can be simply found by using
the flowchart.)
Refrigerant concentration and required quantity of safety measures
Figure 2
(height of ceiling space = 1.8 m)
80
70
60
At least two
50
safety measures
40
are required.
30
20
10
0
0
 Do not place an ignition source in a space where an HBC controller is installed or adjacent spaces not shielded by firewalls.
Examples: Lighters, combustion heaters, combustion boilers, and combustion cookers
 All of the above-mentioned restrictions apply not only to new installations but also to relocations and layout changes.
MEES18K044
Good
NG
(Example: space with a louver)
* Space with a louver is not counted as opened side.
NG (ISO 5149)
At least one
safety measure
is required.
Construction guidance
50 100 150 200 250 300 350 400 450 500 550 600 650
Room volume [m 3 ]
SAFETY HANDLING FOR R32
Good
3