INSTALLATION : GARN® WHS/ETS DIGITAL CONTROLLER
EXTENDING THE SENSOR WIRES It is acceptable to extend the sensor wires for some of the sensors that connect to the Controller. Strictly comply with the following criteria: • Use stranded wire only for extensions, thermostat wire is not acceptable. • Sensor wires must not run parallel with or be attached to high voltage lines. • Making sure that the correct wire colors are continued for proper termination connections on the circuit board. • Do not run any sensor wires within 2 inches of any power source or current carrying wires. Doing so will induce current on the sensor wire resulting in erroneous reading and improper controller operation. • Do not zip-tie or attach sensor wire (or wire extensions) to any power sources or other high current wires.
Refer to the following table for acceptable extension lengths:
Minimum Wire Gauge of Extension (stranded)
Total Allowable Length (includes extension and lead)
Sensor
HOT WATER SUPPLY HOT WATER RETURN
18 AWG 18 AWG 18 AWG
35 ft 35 ft 50 ft
OUTDOOR TEMPERATURE
LOW WATER CUTOFF AND TANK TEMPERATURE SENSOR COMBUSTION AIR DAMPER (OPTIONAL) FLUE GAS TEMPERATURE DO NOT EXTEND WITH COPPER WIRE!
18 AWG
35 ft
18 AWG
50 ft
Use Flue Temperature Sensor Extension kit (12 ft) available at www.garnparts.com
18 ft
DO NOT MODIFY THE DIGITAL CONTROLLER OR ADD ADDITIONAL COMBUSTION CONTROLS
DO NOT MODIFY THE GARN® WHS/ETS DIGITAL CONTROLLER. Doing so will prevent the GARN® unit from operating correctly and result in: creosote formation in the heat
exchanger tubes and exhaust flue; create a fire hazard; damage the GARN® unit; void all manufacturer warranties. An overview of the operation of the Digital Controller can be found on pages 89-90.
Modifications to the GARN® WHS/ETS digital controller include, but are not limited to:
• Additional controls to cycle the induced draft blower on/off or modulate its speed. • The addition of any other control device that modifies the combustion process. • Bypassing the low water cut-off and/or tank temperature sensor
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GARN® WHS 1000 and WHS 2000 Manual | © HY-C® Company LLC | October 2024
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