INSTALLATION : GARN® WHS/ETS DIGITAL CONTROLLER
5) CONNECTING THE SENSOR WIRES TO CONTROLLER CIRCUIT BOARD There are currently (2) versions of the control board in the field. The location of the wiring is different for each board revision. Identify the board revision and then refer to the appropriate wiring pictures.
All sensors are low voltage and are wired on-site. The color of wiring for the fresh air damper and end switch may vary from what’s shown in the manual.
Connect as shown in the following figures. The yellow two prong mini connector on the flue sensor only fits with the correct orientation: the pins are polarized (one large pin and one small pin). The controller will still operate if the Outdoor Sensor, Hot Water Supply Sensor and Hot Water Return Sensors are not connected, but the digital display will flash. The controller will NOT operate unless the low water cut-off, flue temperature sensor, and tank temperature sensor are properly connected and functioning. Tighten all wiring connections firmly. Loose connections may prevent the controller from operating correctly. Leave the pre-installed white jumper wire connected on the contacts
labeled “END SW” if the optional combustion air damper will NOT be used.
REV A WIRING PICTURES Both red and white wires for the supply and return sensors are connected to the same terminal screws. The black wire from each sensor lead goes to its respective terminal.
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GARN® WHS 1000 and WHS 2000 Manual | © HY-C® Company LLC | October 2024
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