TDMA CONTROL 602-702 Eng Nov.doc
69
9
Troubleshooting and Functon
Control
In the event that a temperature sensor becomes defective (short or open), the
controller will respond according to the tables set out below. Whenever a fult
occurs, the LCD display will flash with the fault and the Service Engineer’s
telephone number (if programmed).
Interruption
Sensor Nr. ...
If a sensor is interrupted, the display shows the measure opposite.
Short Circuit
Sensor Nr. ...
A sensor short circuit will appear on the display with the message opposite.
The fault messages are only programmed for functions and their outputs! If a
function (eg. Yield) is not activated and no sensor connected, no error will be
displayed. There will be no reaction to the absence of the sensor. A fault
message will be generated if the collector sensor is not installed when the
system is powered up.
9.1
Solar Control without Additional Function
Sensor Failure
Action
Collector Sensor
Solar pump = Off
Cooling = Normal operation
DHW heating = Normal operation
Store Top Sensor
Solar pump = Off
Cooling = Off
DHW Heating = Off
Store Bottom Sensor
Solar pump = Off
Cooling = Normal operation
DHW Heating = Normal operation
9.2
Solar Control with Active Frost Protection Control
Sensor Failure
Action
Collector Sensor
Solar pump = Off
Cooling = Normal operation
DHW heating = Normal operation
Store Top Sensor
Solar pump = Off
Cooling = Off
DHW Heating = Off
Store Bottom Sensor
Solar pump = Off
Cooling = Normal operation
DHW Heating = Normal operation