DHW Controller dd2m

14^th October                  Software release notes

1. Add config variable SPTY setpoint type, this controls the way in which the slave zone is supervised by it's master zone.
   • SPTY=0 Occupation times are updated from the master, or from a supervisor. This is the default operation.
   • SPTY=1 Local occupation times are ignored, the controller follows the setpoint set on SVSP supervised setpoint, which is sent every minute from the master controller. The master controller is responsible for the Optimum start calculations.
2. A master controller will be released soon which enables DHW setpoint and measured values to be monitored and changed.
   
3. Correct operation of setpoint adjustment limits SPMD,SPRG both for occupied and non occupied setpoints.
4. Config variables for fuzzy control constants moved to fixed location C70-C78 to allow the possibility of global changes with the appropriate PC software.
5. Multiple length flashing of status led when zone is registered, long flash equates to 10. Thus zone 23 two long three short.
6. Add support for Pump changeover modules.
7. Add support for registration to secondary/multiple heat/cool sources. Error Led flashes heat source number in red, or cool source number in yellow.
8. Add two new driver types for immersion heater control

• type=10

  relayA time proportioning control of DHW valve

  relay B immersion heater control, needs auxiliary contactor.
  

• type=11

  relay A & B valve positioning control of DHW valve

  relay C immersion heater control, needs auxiliary contactor.
  The immersion heater is used if Outside Temperature is less than Summer temperature defined by config variable SUMR, default value 15C, and the Boiler Flow temperature (or secondary Heat source) is less than Low Flow temperature defined by LOFL, default value 30C.
  
  The immersion is also used to 'boost' the DHW recovery time if after 15 minutes the Boiler Flow temperature is not higher than the DHW temperature and the DHW control loop is still calling for maximum heat. Boost is disabled if the Outside temperature is above the 'summer temperature'.
  

10. Add new config variables

• SUMR Summer temperature default 15 see above
• LOFL Low Flow temperature default 30 see above
• VMDO Valve mode which has two settings
  • =0 DHW valve stays closed until boiler flow temperature greater than current DHW temperature.
    =1 boiler flow temperature ignored, default setting
    
    
    

11. Inputs, Switches, Sensors & Knobs made available as config style communication request.