Concrete Slab Heating Control

[Qcvictor]

Hi Guys
This is my script for controlling my heater concrete slab, everything is working excepted in cold temperature the Geo stuck because geothermal output temp is too low, I added another probe on the geothermal output for monitoring this temperature.
Need help for introduced this new sensor for stop the Geo unit until she goes up a couple degrees for restart....
Any clue ?

Code: Select all

local heating_probe = 'SensorTempSlab'    --Probe Name Concrete Slab
local heating_probe_geo = 'SensorTempGeo' --Probe Name Geothermal Outpout Slab
local thermostat_setpoint = 'Thermostat'  --Virtual Thermostat 
local heating_unit = 'GeoUnit'            --Virtual Switch Relay On/off Geothermal Unit
local OnOff = 'Heating Slab On/Off'       --Virtual Switch Script On/Off  

local heating_probe_geo_consigne = 35     --Minimum Temp Geothermal Outpout Threshold (°c)
local hysteresis = 0.5                    --Setting Hysteresis (°c)

commandArray = {}

if (otherdevices[OnOff]=='On') then
    
-- loop through all the devices
for deviceName,deviceValue in pairs(otherdevices) do
        if (deviceName== thermostat_setpoint ) then

            if tonumber(deviceValue) < tonumber(otherdevices[heating_probe]-hysteresis) then
        
                if (otherdevices[heating_unit] == "On") then
                
                commandArray[heating_unit]='Off'
                print("Heating is Off")
                end
            
            elseif tonumber(deviceValue) > tonumber(otherdevices[heating_probe]+hysteresis) then
                if (otherdevices[heating_unit] == "Off") then
                commandArray[heating_unit]='On'
                
                print("Heating is On")
                end
                
                      
                end
            end
        end

-- loop through all the variables
for variableName,variableValue in pairs(uservariables) do

end
                elseif (devicechanged[OnOff]=='Off') and (otherdevices[heating_unit]=='On') then
                        commandArray[heating_unit]='Off'
                    print ('chauffage extinction')
                end

return commandArray