INSTALLATION : GARN® WHS/ETS DIGITAL CONTROLLER
DO NOT USE CELLULOSE INSULATION . The acid treatment of the cellulose will corrode the steel tank. Use only fiberglass insulation around the electric element box.
7) Fill the insulation enclosure to 6” above the tank portion of the GARN® WHS. 8) In an industrial setting, the unit may be wrapped with pre-formed, high-density non-combustible fibrous insulation covered with a fireproof canvas and plaster overcoat. This would eliminate the construction of an insulation enclosure and allow ongoing easy access to all sides of the unit. GARN ® WHS/ETS DIGITAL CONTROLLER REFER TO THE OVERVIEW OF THE DIGITAL CONTROLLER SECTION OF THIS MANUAL FOR A DESCRIPTION OF THE CONTROLLER BUTTONS AND LCD DISPLAY MESSAGES.
The GARN® WHS/ETS digital controller was developed to perform the following functions:
• Increase unit efficiency by eliminating blower operation beyond the termination of combustion. • Provide measurement (+/- 5°F) of flue gas, thermal storage, hot water supply, and hot water return temperatures. ONLY CONNECT AS INDICATED IN THESE INSTRUCTIONS. There are several connections that are not used on the controller circuit board. The GARN® WHS/ETS Controller does not play any role in the control or distribution of the heated water, other than monitoring water temperatures. The digital controller uses a pre-programmed chip that is upgradeable as control improvements are developed. With minor alterations the controller and sensors can be retrofitted to almost all existing GARN® WHS units dating back to 1990. The digital controller will terminate blower operation when the flue gas temperature (FGT) is within 5°F (V1.XX chip) or 20°F (V2.XX chip) of the thermal storage temperature (TST) for 10 minutes. When the controller terminates the blower, little to no firewood should remain in the firebox. The 10 minute delay: • Allows time for reloading if the operator wants to add additional fuel to the combustion chamber without needed to restart the controller after reloading. • Ensure complete combustion of the wood pile. The following components are included with the basic Wood Heating Only version of the WHS/ETS Digital controller: 1. Low Water Cut-Off (LWCO) & Thermal Storage/Tank Temperature Sensor (TST) – UL listed with brass stem, 5-wire lead, 2- piece plastic fitting, and an integrated tank temperature sensor. 2. Flue Gas Temperature Sensor (FGT) –Type K thermocouple with 60” lead and 1/4” x 1/4” brass compression fitting.
3. Outdoor Temperature Sensor (OT) – RTD temperature device with 25’ 3 wire lead. 4. Hot Water Supply Sensor (HWS) - RTD temperature device with 25’ 3 wire lead. 5. Hot Water Return Sensor (HWR) - RTD temperature device with 25’ 3 wire lead.
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GARN® WHS 1000 and WHS 2000 Manual | © HY-C® Company LLC | October 2024
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