66
SENSOR FAILURE/ACTUATOR AND PUMP EXERCISE15.0
15.1 Sensors/Controller Failure
If a Room sensor/controller is defective or if the communication
to the unit is interrupted, an alarm will be triggered. Depending
on the system configuration the control will continue in one of the
following ways.
- If there are several units on the same channel which have a
room sensor (which is still intact), the control will continue as
before, however without contribution from the defective unit
- If no valid room sensor/controller is found, the system will run at
constantly 20% ON
The emergency program is only valid for channels with heat
control. Channels with cooling control will always run at 100%
OFF in connection with a defective room sensor.
15.2 Actuator and Pump Exercise
If no automatic ON/OFF sequence of pumps occur over a 72
hour period, an exercise of these components will take place.
The actuators will be activated for 3 minutes. The pumps will be
started for 10 seconds during that period and there will be no
firing of the boiler.
To Next Page
Loading...
