Automatic Ventilation Switching - Mitsubishi Electric Lossnay series Technical Manual

9. Automatic Ventilation Switching

(Refer to technical manual (Control) page C-40)
Effect of Automatic Ventilation Mode
The automatic damper mode automatically provides the correct ventilation for the conditions in the room. It eliminates the need
for manual switch operations when setting the Lossnay ventilator to "bypass" ventilation. The following shows the effect "bypass"
ventilation will have under various conditions.
(1) Reduces Cooling Load
If the air outside is cooler than the air inside the building during the cooling season (such as early morning or at night),
"bypass" ventilation will draw in the cooler outside air and reduce the cooling load on the system.
(2) Cooling Using Outdoor Air
During cooler seasons (such as between spring and summer or between summer and fall), if the occupants in a room
cause the temperature of the room to rise, "bypass" ventilation will draw in the cool outside air and use it as is to cool the
room.
(3) Night Purge
"Bypass" ventilation can be used to release hot air from inside the building that has accumulated during the hot summer
season.
LGH-RX -E series has night purge function, that is used in the summer to automatically ventilate a room at night while
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the air conditioner is stopped, to discharge accumulated heat and thereby reduce the air conditioning load the next
morning. (Selectable function)
(4) Cooling the Office Equipment Room
During cold season, outdoor air can be drawn in and used as is to cool rooms where the temperature has risen due to
office equipment use. (Only when interlocked with City Multi and M-Series or P-Series indoor units.)
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CHAPTER 5 System Design Recommendations
U-55