Mitsubishi LGH-15RX5-E Handbook page 29

3 Bypass ventilation prohibited
When the conditions described below are applicable, the ventilation mode will be fixed at Lossnay ventilation.
When bypass ventilation has been set from the remote controller or the system controller, damper operation
will be set to Lossnay ventilation, even though bypass ventilation is displayed on the ventilation mode display.
G When the outdoor temperature is 8ºC or lower. (Product condensation prevention)
When bypass ventilation prohibition has been set under this condition, the prohibition will be cancelled
when the outdoor temperature goes from a temperature of less than 10 ºC to one higher than 10ºC.
G When there is an outdoor temperature (Outdoor Air) thermistor fault.
G When, in the automatic ventilation mode, there is an outdoor temperature (Outdoor Air) or indoor tempera-
ture (Return Air) thermistor fault.
G When Lossnay is set to the automatic ventilation mode and interlocked with Mr.Slim or City Multi indoor units
set to the fan operation mode.
4 Damper operation
The damper provides control with a 30 second period. Accordingly, a delay of 30 seconds maximum may be
generated from ventilation mode switching to damper operation.
5 Automatic ventilation algorithm temperature map
Ventilation mode switching of Lossnay ventilation/Bypass ventilation in the automatic ventilation mode is in
accordance with the following map.
a. Systems interlocked with Mr. Slim and City Multi indoor units
The map will differ depending on the operation mode that has been set with the A-control remote controller
or the K-control remote controller for Mr. Slim, or the MA remote controller or the ME remote controller for
City Multi indoor units. There will be switching to the ventilation mode in conjunction with the set tempera-
ture of the air conditioner remote controller. Note that the "b" map will be followed while Mr. Slim and City
Multi indoor units are stopped.
40
Lossnay
Ventilation
35
30
Remote controller
Set temperature
25
20
15
10
Bypass ventilation
Prohibition temperature 8ºC
5
0
0 5
Lossnay ventilation area
Bypass ventilation area
Undetermined area
When operation starts under this condition, Lossnay ventilation will be activated.
When this condition is reached after operation starts, the current ventilation mode is maintained.
Cooling mode
Undetermined area
Bypass
Ventilation
10 15 20 25 30
Indoor temperature ºC
40
35
Ventilation
30
25
Undetermined area
20
15
10
5 Lossnay
Ventilation
0
35 40
0
— 29 —
Heating mode
Undetermined area
Bypass
Remote controller
Set temperature
5 10 15 20 25
Indoor temperature ºC
Bypass
Ventilation
4ºC
30 35 40