Differential controller for swim Differential controller for swimming pool solar hot water system - NOT variable
Model DC20-1807C

Differential controller for swimming pool solar hot water system Variable -  Can also be used for hot tubs, drain back solar hot water systems and solar heated outside showers etc.

** Each of these Differential Controllers are built with quality components and are thoroughly checked and tested before shipment.

For 12vDC models click the links below:
https://www.ebay.co.uk/itm/265791037971 - Variable prewired
https://www.ebay.co.uk/itm/265791041547 - Variable terminal blocks

For other 250vAC/DC models click the links below:
 https://www.ebay.co.uk/itm/265769726518 - Variable terminal blocks
https://www.ebay.co.uk/itm/265769733540 - Variable prewired

Specifications:

 

Feed voltage: 12v DC

Output: 12vDC 4A

Manual override switch to turn on the pump at any time and at any temperature

Temperature range: from 0°C to 90°C (32°F to 194°F)

Differential controller dimensions - 85x50x21mm (3.35x1.97x0.83 Inches)

Led indication when operating

Differential range: Approx. 20°C (68°F) with Approx. 1.5°C of Hysteresis
HS Code: 85423190

*** After much experimentation 20°C (68°F) is an ideal differential temperature.

Supplied with 2x waterproof sensors

Operation:

Whenever hot water sensor is measured to be hotter than the cool water sensor by approximately 20°C, the differential pump controller switches on which then supplies 12vDC to a water pump and led comes on. The output remains on, until the measured temperature difference between the two sensors has fallen to below 20°C (68°F)

For example:

The hot sensor can be located on the output of a solar panel, the cool sensor can be located in the water or on a water pipe of a swimming pool
In this way when water in the solar panel is hotter than the pool water by 20°C or above - the 12vDC water pump will switch on.

Say the temperature of the swimming pool water is +18°C (64°F) and when the temperature of the solar panel reaches +38°C (100°F) (18°C+20°C) or greater then the pump will switch on. 

Please note: solar panels can and often do reach temperatures of about +70°C (158°F) when the sun is shining which can give an approximate output water temperature of between +30°C (86°F) and +50°C (122°F)...and perhaps more!

 
The differential pump controller also has a manual override switch which can turn the pump on at any time and at whatever temperature.
 
Information: Model DC20-1807C
These differential pump controllers are batch processed for quality.
 

Package content:

1x 12vDC differential pump controller

2x waterproof sensors with wire lengths of 25cm - (the wire can be extended up to 15 Metres/50 feet)

Wiring diagram and user manual (English)

Additional items required:

12vDC brushless water pump (240 to 480 litres per hour).

12vDC power supply >= 2 amps but amperage dependant on water pump

 

   Auction notes and Seller's payment instructions

Important Auction Notes:

 

Your purchase is a contract - You will enter into a legally binding contract to purchase the item. Purchase the item ONLY if you're serious about buying the item.

If the seller is unable to establish contact with the winning bidder within 3 days of the end of the auction or if payment is not received within 5 days, we will cancel the auction, the bidder shall be reported to eBay and the seller will file an Unpaid Item Dispute against the bidder.

Payment Instructions:

Please only bid if you intend to complete the purchase.

The package will only be delivered to the delivery address on the eBay account

Estimated Delivery Times:

UK and most European countries: Approx. 7-15 Days

Outside of Europe: Approx. 21-55 days

International Buyers - Please Note:
Import duties, taxes and charges are not included in the item price or shipping charges. Unfortunately it is the responsibility of the buyer if these charges are payable.

Proof of despatch is always obtained.

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