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  • Caleffi iSolar WMZ G1 kWh (Btu) Heat Meter - 257202A G1

    - with Data Connection to DL2 Datalogger

    Product ID • 257202A00000

  • This Product is no longer available through Houseneeds.com. It has either been discontinued, made obsolete, or is no longer available for sale. Please select another product. Please click here to see Replacement Product.

Overview

The iSola WMZ-G1 is an energy heat meter for thermal solar systems and conventional heating systems. The WMZ-G1 calculates energy by integrating flow rate and temperature from a Vortex Flow Sensor (VFS) Grundfos Direct Sensor and temperature difference in the flow and return piping using a Relative Pressure Sensor (RPS) Grundfos Direct Sensor. The calculated heat energy value is displayed in kWh (kilowatt hours) and stored. A memory feature guarantees that the adjusted system parameters and the calculated heat energy quantity are maintained in the case of power loss. A red/green operating control lamp continuously indicates four operating states: normal operation, measured value outside pre-selected alarm limits, defective sensor, or no supply voltage. An integrated dry contact output alarm relay can be connected to an additional signaling device or to a building management system.

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Manuals & Docs

Technical Specs

Caleffi Solar Controller iSolar4- 257202A G1 Specs

  • Housing plastic
    PC-ABS
  • Display
    4 lines LCD
  • Inputs
    2 Grundfos Direct Sensors
  • Output
    1 relay
  • Switching relay capacities
    2 (1) A 24V
  • Interface
    VBus data connection
  • Power supply
    24V AC or DC
  • Flow measuring range
    NA15015 0.25 - 3 gpm (1-12 lpm)
  • NA15016 0.50
    10 gpm (2-40 lpm)
  • Flow accuracy
    1.5%
  • Flow response time
    < 1 sec.
  • Relative Pressure Sensor (RPS)
    Yes
  • Pressure measuring range
    0 - 150 psi (0-10 bar)
  • Pressure accuracy
    2% FS
  • Pressure response time
    < 1 sec.
  • Max. fluid temperature
    250° F
  • Temperature accuracy range
    32 - 210°F
  • Temperature accuracy
    2%
  • Temperature response time
    < 1sec.
  • Suitable fluids
    water, glycol solution
  • Max percentage of glycol
    50%
  • Bodu Material
    brass
  • Seals
    EPDM
  • Sensor housing
    composites (PPS, PA66)
  • Connection
    1" male union thread

Info & Links

Solar Heating and Solar Domestic Hot Water with Flat Panels Example

Solar Heating / Solar Domestic Water with Evacuated Tubes and Boiler Example

Solar Domestic Hot Water, Solar Heating and Solar Pool Heating with Flat Panels

Solar Domestic Water with a Water Heater as a Backup Heat Source Example

Solar Panels for Domestic Water and Space Heating with a Boiler as the Backup Heat Source Example

Solar Panels for Domestic Water and Space Heating Pre-Heating into a Gas Combination Boiler Example

Solar Space Heating with a Backup Gas/Electric Boiler Installation Diagram

Hot Water Output examples for 3 locations

Solar Hot Water System Install - Waitsfield Vermont

Solar Hot Water System Install - Maine

Solar Hot Water System Install - Upstate New York

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