Differential thermostat home solar hot water heating pump controller 12V 10A box

Limited Time Offer!

Hurry, our best price won’t last long! Click to check out the exclusive deal:

Click here to see the best price

Differential thermostat home solar hot water heating pump controller 12V 10A box

This controller is designed to control a 12VDC or 220VAC electric water pump in the solar hot water system

Have outputs for 2 probes which need to be connected to output pites of the solar panel and boiler. The differential is adjustable with the trimmer.

The probes are two NTC 10K and need to be soldered to insulated copper wires min 2x0.25 thickness.

Have led indication for working pump.

The output is Normally open contact with power 20A 12V and 7A 220V.

Technical data:
1. Voltage - 12 v DC

 Red - 12V+ 

 Black - 12V-

2. Temperature range: from 10C to 90 oC
   3. Differential range form   0.3  to 50C - set with trimmer.
   4. Relay Output : 7А/125V DC
                               7A/250V AC
                               20A/12V DC

Please note that output - two white wires is normally open contact - there don't have any voltage. 

Can be used with 12V or 220V pump

5. 
   Sensors - NTC 10K not waterproof.  Need to be soldered to wire - max length 15m
   
   Dimensions - 40x28x22 mm.
   
   Led indication for working load.
   
   Method of work - Whenever Probe 2  is measured to be hotter than Probe 1 , the output NO contact of the relay closes and led comes on. The output remains on until the measured temperature difference between the two sensors has fallen depending of the set differential by the trimmer.
   
   Setting differential temperature:
   
   The trimmer needs to be at an average position initially. Rotate it at left and right precisely until led go off.
   In this way thermostat is set at the lowest differential temperature and is ready for work.
   When you rotate it counterclockwise - increase the differential temperature. Please note that trimmer is not so precise and small rotating make big change of the temperature between two sensors.  
   
   For example - Probe 1 can be located at the output pipe of hot water boiler and Probe 2 - is to Output pipe of the solar panel. The output NO contact can be used to drive 12V or 220V up to 10A water pump.
   In this way - when the solar panel is hotter than boiler - the pump will come on.
   When the Differential temperature of the two probes is equal to the set by trimmer - the relay will be deactivated