Mitsubishi Electric LOSSNAY LGH-F300RX5-E Handbook page 21

3 Bypass ventilation prohibited
When the conditions described below are applicable, the ventilation mode will be fixed at Lossnay ventila-
tion. 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.
When the outdoor temperature is 46.4°F (8°C) or lower. ( 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 50°F (10°C) to one higher than 50°F
(10°C).
When there is an outdoor temperature ( Outdoor Air ) thermistor fault.
When, in the automatic ventilation mode, there is an outdoor temperature ( Outdoor Air ) or indoor tem-
perature ( Return Air ) thermistor fault.
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 control-
ler or the K-control remote controller for Mr. Slim, or the MA remote controller or the ME remote controller
for City Multi indoor units. The ventilation mode will be switched in conjunction with the set temperature of
the air conditioner remote controller. Note that the "b" map will be followed while Mr. Slim and City Multi
indoor units are stopped.
Heating mode (Winter)
110
Bypass
100
Ventilation
90
80
Undetermined area
70
60
50
40
Lossnay
Ventilation
30
30 40
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.
Undetermined area
Bypass
Ventilation
77°F(25°C)
7.2°F(4°C)
Bypass ventilation
Prohibition
Remote controller
temperature
Set temperature
46.4°F(8°C)
50 60 70 80 90
Indoor Temperature °F
110
Ventilation
100
90
80
70
60
50
Bypass ventilation
Prohibition temperature
40
46.4°F(8°C)
30
100 110 30
─ 21 ─
Cooling mode (Summer)
Lossnay
Undetermined area
77°F(25°C)
40 50 60 70 80
Indoor Temperature °F
Bypass
Ventilation
90 100 110