Only if the RTD-10 is operated in Duty/Standby mode an auxiliary space sensor can be fitted to provide alarm monitoring in the controlled space. The space sensor is wired between input S4 and '0V' (on the same terminal block) of the master RTD-10 (RS485 address '0').
The sensor should be a 10kΩ NTC Thermistor (we do not recommend any specific thermistor) mounted on a suitable vertical surface in the monitored space. The sensor should be wired to the RTD-10 using a twisted pair cable no longer than 100 metres.
- The auxiliary thermistor may be very sensitive to temperature changes. Minimal changes may cause an alarm signal if placed improperly. Please contact your installer or Daikin technical support to ask if they have any recommendation with regards to how or where to place the auxiliary sensor, or if there is a way to cover it to change thermal capacity.
- It is possible to change the L1 and L2 temperature differences (we advise against that) as follows::
- Set the RTD-10 to Standard operation mode (DIP switches 1 and 2 OFF)
- Using Modbus, change the Duty/Standby L1 Alarm Temperature difference by writing the value to Holding Register 11212 (DeltaT in DegC).
- Using Modbus, change the Duty/Standby L2 Alarm Temperature difference by writing the value to Holding Register 11213 (DeltaT in DegC).
- Set the RTD-10 to Duty/Standby mode (DIP switches and 2 ON)
Note that this auxiliary space sensor is only for alarm monitoring (level 1 and 2 alarms in RTD-10 Duty/Standby operation mode). For further information see the RTD-10 attached installation instructions, pages 11 - 13.
Daikin units usually monitor the space temperature via the return air temperature sensor or the wired remote controller. However, in Duty/Standby mode it is not possible to use the remote controller's thermistor for alarm monitoring.