Operation Manual
Document nr. : 053682
Version : V1.1
MC 795D
Client : General
Page : 5 of 16
3
Control of the thermostat.
Normally the displays show the measured humidity and the selected setpoint.
Switching the thermostat on and off.
With the
ON/OFF
key the MC 795D can be switched on and off. Is the hygrostat switched off, all
displays are off. No control function is active.
Select and change humidity setpoint.
With the
UP
and
DOWN
keys the desired setpoint can be selected. The LED's next to the
setpoint display indicate which setpoint is shown.
By pushing the
SETPOINT
key, the setpoint starts flashing. With the
UP
and
DOWN
keys the
setpoint can be changed. By pressing the
SETPOINT
key again, the new setpoint is accepted.
Read-out and switching sensors on and off.
By pressing the
SENS
key the humidity of the first sensor is shown in the upper display.
The lower display shows the number of the sensor and of the sensor is switched on or off. 'S1on'
means that the humidity of sensor 1 is shown and that the sensor is switched on.
Sensors that are switched on are used for the control, switched off sensors not. If more sensors
for a hygrostat are switched on, the control is based on the average of those sensors.
If during the read-out of a sensor is pressed on the
SETP
key, a sensor can be switched on or
switched off.
By pressing the
SENS
key once again, the next sensor is shown. After all sensors are shown,
the average measured humidity and the setpoint are shown in the display.
Reset the alarm.
As soon as an alarm situation occurs and an error message appears on the display can, by
pressing the
RESET ALARM
key, the alarm be reset.
The error message remains in the display, until the cause of the error is solved.
Day/night input.
If the
NIGHT
input is closed, the MC 795D turns to the night mode. The
NIGHT
LED will light.
The setpoints are increased with the night offset.
External alarm input.
If the external alarm input is closed, an alarm message “FE” appears in the display. The alarm
relay is activated. By pressing the
RESET ALARM
key, the alarm be reset. The error message
remains in the display, until the cause of the error is solved.