Burkert Type 8660 - Manual (Page 14)

Type 8660 Control Center
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6.2 Functions
Heating operation
The cooling water which is heated by the motor of the bus has a temperature of
approximately +80 ºC. By means of a water pump in the motor and the
supplementary water pump, the heated water is directed by a motor valve with
variable flow (front box valve) from the heat exchanger in the front box over a
thermostat controlled valve, to the heaters in the floor and roof areas.
The temperature in the front box area can be controlled by the motor valve. Under
the direction of a position regulator, the valve setting will be adjusted based on the
preset temperature set point.
Ventilation operation
The desired blower lever for the ventilation of the front box area can be set with the
middle knob (rotary switch). Blower lever 1 is already usable when the ignition is
switched on. Blower levels 2 and 3 can only be switched on when the motor is
running. With the front box flaps, the air direction can be directed toward the
windshield, toward the driver (foot area), or toward both. The unit in the passenger
area can be separately switched in Ignition on, Motor off and Motor on.