Heating control - user manual
www.solarcontrols.cz
Instructions for the installation and setup
of the device
Page 27 of 58
“Input – output temperature” – the temperature sensor on the pipe exiting the boiler. Obligatory in all
cases.
“Output – circulation pump” – it switches on the circulation pump of the boiler.
“Output temp. steepness request” – the control according to a) requires the operation of the
circulation pump.
“Delayed output temp. steepness request” - ditto, delayed by the “Output temp. steepness request off
– delay” item.
“Differential thermal control request” – the control according to b) requires the operation of the
circulation pump.
“Circulation pump request” – logical sum (function OR) of both requests for the operation of the
circulation pump.
“Input temperature” – the temperature of water entering the boiler.
“Output temperature” – the temperature of water exiting the boiler.
“Output temperature steepness” – it shows the steepness (change) of the output temperature in half-
minute intervals. This value is used only for the control according to a).
“Threshold control off-timer” – in the case of a) it shows the time until the expiration of the request
for the operation of the circulation pump.
“Circulation pump power” – if a PWM-controlled circulation pump is used, it shows its current power
in %.
“PWM-controlled circulation pump” – tick if you use a circulation pump whose power is proportionally
controlled (usually) by means of the PWM signal. In this case the Ext1 or Ext2 outputs must be used.
As the power supply of this pump is usually separated from the signal conductor, it is possible to use
the “Status duplicate” block in the “Others” tab for switching on the power supply on the basis of the
switching on of the Ext1 or Ext2 output. PWM control requires both temperature sensors.
“Run on output temp. sensor error” – tick if you want to switch on the circulation pump in the case of
a defect on the output temperature sensor. This function treats a possible accident state involving the
overheating of the boiler if the output temperature sensor is not functional and the controller cannot
react to the behaviour of the boiler. The boiler must be protected with a safety valve, nevertheless
this option allows you to secure a state in which the controller is working but the sensor is not.
“Minimum power of circulation pump” – it shows the minimum power of the PWM-controlled
circulation pump if it is used and if its operation is requested.
“Minimum output temperature to switch on” – the circulation pump is activated only when the output
temperature is higher than this limit. Set it according to the requirements of the connected boiler.
“Minimum output temperature steepness to switch on” – the control according to a) is activated only
when the output temperature steepness exceeds this limit.
“Thermal diff. to switch on” – the control according to b) is activated only when the difference
between the output and input temperatures exceeds this limit.
“Thermal diff. to switch off” – the control according to b) is deactivated when the difference between
the output and input temperatures drops under this limit.
