Mitsubishi Electric City Multi CMH-WM250V-A, Service Handbook

Page: 23 / 436

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
12 -
chapter 1 BS_01_G
1
Che
ck Bef
o
re
Se
rvicing
13. Installation restrictions for Hydro units
C: Create an appropriate ventilation open area.
NG
Good
Longitudinal
direction
Width of an opening
≥ 0.9 m
Height from the ground to
an opening ≥ 0.125 m
Opening:
•
Must occupy 80% of the
longitudinal side of a space.
• Must have an opening ratio of
75% or higher.
(Example: space with a louver)
(Example: basement)
Height of an opening
≥ 0.15 m
• Do not place an ignition source in a space where a Hydro unit is installed or adjacent spaces not shielded by
firewalls.
Examples: Lighters, combustion heaters, combustion boilers, and combustion cookers
• Figure 2 shows the minimum floor areas required for given amounts of refrigerant in various refrigerant
systems. Make sure the installation conditions meet the requirements shown in the figure. Take appropriate
safety measures in accordance with the instructions provided in Figure 2.
• When installing a Hydro unit in a machine room or a riser, minimum floor area requirements shown in Figure 2
(system refrigerant amount / minimum floor area ≤ 0.11) must be observed, and the Hydro unit must be installed
at a height of 1.8 meters or higher.
• All of the above-mentioned restrictions apply not only to new installations but also to relocations and layout
changes.
[Restrictions for Hydro unit installation]
Observe the following restrictions that apply to the installation of Hydro unit.
Figure 2
In addition to what is listed below, floor-standing units will require an agitator.
0
10
20
30
40
50
60
70
80
0 50 100 150 200 250 300 350 400 450 500 550 600 650
At least two safety
measures are
required.
Room volume [m
3
]
System refrigerant amount [kg]
NG (ISO 5149)
At least one safety
measure is required.
Construction guidance
0000005109.BOOK 12 ページ ２０１９年５月９日 木曜日 午前１０時１分