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Houseneeds.com    Home / Solar Water Heating / Caleffi iSolar Relay Controls / iSolar4 257240A Buy
Caleffi iSolar4 Controller 257240A Buy Page

Solar with 1 electronic output relay for pump speed control and 1 speed control relay for thermostatic control of second pump

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Caleffi iSolar 4 Solar Controller - 257240A
Click here for more info on Caleffi - iSolar 4 Controller - With 2 Control Relays for Solar Pump and Second Pump or Valve, includes 3 sensors, Vbus connection - 257240A 
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Caleffi - iSolar 4 Controller - With 2 Control Relays for Solar Pump and Second Pump or Valve, includes 3 sensors, Vbus connection - 257240A $224.75 
iSolar intelligent Web Enabled Datalogger to connect to Delta T Controllers
Click here for more info on Caleffi iSolar DL Datalogger - Connects to iSolar Controllers through Vbus - Includes Software - 257201A 
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Caleffi iSolar DL Datalogger - Connects to iSolar Controllers through Vbus - Includes Software - 257201A $409.75 
Click here for more info on Caleffi iSolar RS232 Interface iSolar controllers through Vbus - Includes Software - 257203A 
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Caleffi iSolar RS232 Interface iSolar controllers through Vbus - Includes Software - 257203A On Sale!
$173.75
$109.75 

iSolar Delta T Replacement Sensors
Click here for more info on Caleffi FKP6 collector sensor with 5 foot black cable - Platinum RTD type - 1000 Ohm - minus 58 to 355 degrees - 257205 
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Caleffi FKP6 collector sensor with 5 foot black cable - Platinum RTD type - 1000 Ohm - minus 58 to 355 degrees - 257205 $23.95 
Click here for more info on Caleffi FRP6 Storage Tank Sensor with 8 foot Gray Cable - Platinum RTD type - 1000 Ohm - 15 to 200 degrees - 257206 
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Caleffi FRP6 Storage Tank Sensor with 8 foot Gray Cable - Platinum RTD type - 1000 Ohm - 15 to 200 degrees - 257206 $22.75 
Click here for more info on Caleffi FKP9 Collector Screw Mount Sensor with 5 foot black cable - Platinum RTD type - 1000 Ohm - minus 58 to 355 degrees - 257207 
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Caleffi FKP9 Collector Screw Mount Sensor with 5 foot black cable - Platinum RTD type - 1000 Ohm - minus 58 to 355 degrees - 257207 $36.75 
Click here for more info on Caleffi Replacement Fuse T4A - 257208 
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Caleffi Replacement Fuse T4A - 257208 $1.95 
Caleffi iSolar Accessories
Click here for more info on Caleffi Electrical Mounting Box For ISolar Controllers - NA10120 
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Caleffi Electrical Mounting Box For ISolar Controllers - NA10120 $28.75 
Click here for more info on Caleffi Lightning Protection for FKP6 Collector Sensor - NA15006 
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Caleffi Lightning Protection for FKP6 Collector Sensor - NA15006 $28.75 
Click here for more info on Caleffi FKP6 Collector Sensor Well with 3/4 inch NPT Thread - NA257209/NA15029 
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Caleffi FKP6 Collector Sensor Well with 3/4 inch NPT Thread - NA257209/NA15029 $17.25 


Caleffi Solar Controller iSolar4 - 257240A Features:

  • Delta T Cotrol - When the switch-on difference is reached, the pump is activated until the differential temperature drops below
  • Maximum tank temperature - When the adjusted maximum tank temperature is exceeded, the pump switches off
  • Collector emergency shutdown - If adjusted collector temperature is exceeded, the solar pump is switched off
  • System cooling - If the temperature rises to the maximum collector temperature the solar pump remains on until the temperature drops
  • Minimum collector temperature - a minimum set temperature which must be exceeded before the solar pump is switched-on
  • Antifreeze function - If the adjusted temperature drops, the solar pump is switched on to protect the fluid from freezing
  • Tank Cooling Function - In the evening, the solar pump continues running until the storage tank is cooled down
  • Tube Collector Function - The controller measures an increase of heat rise in the collector and adjusts operation for maximum efficiency
  • Heat Generation Measrurement KWh (BTu) - The heat generated is measured by the flow and the temperature of feed and return sensors
  • Operating hours counter - Operating hours counter stores the solar operating hours of the respective relay
  • Manual operating mode - For control and servicing, the operating mode of the controller can be switched manually

Click here to view PDF Manuals, PDF Documents, PDF Specifications on this product Caleffi iSolar4 257240A Controller PDF Manuals and Brochures - Click Here

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