Automatic Ventilation Switching - Mitsubishi Electric Lossnay LGH-100RX3-CAN Technical Manual

9. Automatic Ventilation Switching

9.1 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 troublesome switch operations when setting the Lossnay ventilator to "By-pass" ventilation. The following shows the effect
"By-pass" 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), "By-
pass" 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 people in a room cause the
temperature of the room to rise, "By-pass" ventilation draw in the cool outside air and use it as is to cool the room.
3. Night purge
"By-pass" ventilation can be used to release hot air from inside the building that has accumulated in buildings a business dis-
trict during the hot summer season.
4. Office equipment room cooling
During cold season, outdoor air can be drawn in and used as is to cool rooms where the temperature has risen due to the
use of office equipment.
(Only when interlocked with City Multi and Mr. Slim indoor unit)
9.2 Switching between Heat Recovery and By-
pass in the Automatic Ventilation Mode
Control of the automatic ventilation mode is performed according to the table below and automatic algorithm temperature maps.
Note that operation is fixed at heat recovery when the fan is stopped or when there is an abnormality with the thermistor.
When in automatic ventilation mode when not interlocked with City Multi or
Mr. Slim indoor unit. ( Including when interlocked by external control input. )
When the outside temperature has been 28°C or higher in the last 24 hours.
Interlocked with City Multi indoor
unit
Interlocked with Mr. Slim indoor
unit
Note:
There is a maximum delay of 30 seconds during damper switching.
Even if "By-pass" is selected by the Lossnay remote controller, Lossnay ventilation will be performed if the outdoor tempera-
ture is 8°C or less. This is to prevent condensation.
When multiple City Multi indoor units are connected in a group, the average set temperature for each indoor unit will be the
target temperature. The set temperature is the target temperature for the Mr. Slim indoor unit.
In the case of ( b ) when the indoor unit is stopped for the winter, cooling with outdoor air is performed because equipment in
the room may cause a rise in indoor temperature.
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Conditions
Fan mode operation for all interlocked indoor units. Fixed to Lossnay ventilation.
Heating mode for one or more inter-
locked indoor units.
When indoor units are stopped and only
Lossnay unit is operated.
Conditions other than the above.
Mr. Slim in fan mode.
Mr. Slim in heating mode.
Mr. Slim in ventilation mode.
Conditions other than the above.
Temperature Map
According to ( a ) .
According to ( b ) .
According to ( c ) .
Fixed to Lossnay ventilation.
According to ( d ) .
Fixed to Lossnay ventilation.
According to ( c ) .
According to ( a ) or ( d ) .
According to ( d ) .