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

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[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]
BS_01_G
chapter 1 -
11
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12. Installation restrictions for outdoor units
Do not install the unit where combustible gas may leak.
- If combustible gas accumulates around the unit, fire or explosion may result.
• Provide sufficient space around the unit for effective operation, efficient air movement, and ease of access for
maintenance.
• Note that refrigerant gas is heavier than air and will therefore tend to collect in low spots such as basements.
• When an indoor unit that draws in outside air exits near the outdoor unit, be careful not to affect the normal
operation of the indoor unit.
• When the amount of drain water is excessive, drain water comes out of the outdoor unit along the panel during
heating operation. Provide sufficient space around the unit.
• 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 basement or machinery room, where the refrigerant stagnates.
• Install the outdoor unit in a place where at least one of the four sides is open.
• If the unit needs to be installed in a space where all four sides are blocked, confirm that one of these situations (A,
B, or C) is satisfied.
A: Secure sufficient installation space (minimum installation area: Amin).
Install the unit in a space with an installation area of Amin or more, corresponding to the refrigerant amount
(M). (M = factory-charged refri refrigerant to be added on site)
M (kg) Amin (m 2 )
Amin
10 112
20 223
30 334
40 445
50 556
60 667
B: Install the unit in a space with a wall height of ≤ 0.125 m.
Good Good Good NG
Wall height ≤ 0.125 m
(No restrictions apply to
the refrigerant amount)
Wall height ≤ 0.125 m
0000005109.BOOK 11 ページ ２０１９年５月９日 木曜日 午前１０時１分