ESR31 R3 Solar Controller

The ESR31-R3 is as per ESR21-R3 but has a modified readout including a schematic visua. In open loop solar systems, increases system efficiency and pump reliability by starting pump on high speed to increase starting ability and slows pump down to minimize mixing in the tank.

The ESR31 is a differential control unit which has been consciously made easy to install and operate. Its wide range of controls makes it useful in a multitude of applications: with solar thermal systems for domestic water and swimming pools, water heater loading, ventilation control, burner requirements with a holding circuit, air flap control for earth collectors with a temperature window, etc.

• All of the switch-on and switch-off points can be set separately

• Clear display with icons for all of the values and schematic of the system displayed

• Status display for immediate recognition of extraordinary conditions

• Solar start function

• Pump blockage if collector overheats

• Anti-freeze function

• Heat meter

• Speed control

• Use of 3 temperature sensors of types KTY (2 k?) or PT1000

• Overvoltage protection at all inputs

• Very easy to install and operate

• Min/Max thresholds -20 to 150deg.C

• Differential temperature 0 to 99deg.C

• Accuracy typ.+/-2%

• Operating voltage 230 V AC 50-60HZ

• Power Consumption max. 3VA

• Rated current load 1.5A resistive-inductive cos phi 0.6

• Transformer short circuit proof

• ESR21 Controller Manual