Cutsheet: GARN® WHS-2000
TEMPERATURE SENSORS (INCLUDED): The GARN WHS Digital Controller (4) reads and displays temperatures from the following temperature sensors:
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Sensor Acronym
Description
TST
Thermal Storage Temperature
FGT
Flue Gas Temperature
HWS HWR
Hot Water Supply Hot Water Return
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OT
Outdoor Air Temperature
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2
THERMAL PERFORMANCE: Annual Efficiency Rating..................................74% (HHV) / 79% (LHV) Firing Rate 1 ..............................................................................311,000 btuh Heat Delivered to Thermal Storage 1 .................................860,000 btu Heat Output Rate.........................................................See Table 1 Below 1 Based on a single fuel charge of 155 lbs red oak with 22% moisture content. Values will vary based on fuel species, moisture content, and unit elevation. There is a fundamental difference between the ring rate and output rate (building heat load). Firing (Heat Input) Rate: the rate at which heat is added to the thermal storage from the process of wood combustion and the efficiency of the heat exchanger. Heat Output Rate: the rate at which heat is removed from the thermal storage and delivered to the connected heating system. With conventional wood heating systems, the equipment attempts to match the firing rate to the output rate. With the GARN WHS, the firing rate is nearly constant during the wood combustion process while the output rate varies. The operator continues to add wood until the thermal storage temperature is up to 195°F. Table 1 illustrates how long the GARN WHS thermal storage will last before the need to re-fire. For example, with a heat load of 75,000 btuh and a lower system operating temperature of 125°F, re-firing is required every 13.8 hours.
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8
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ELECTRONICS AND CONTROLS (INCLUDED):
Blower Motor: The blower motor is connect to a blower wheel inside the GARN’s custom designed blower housing. The blower motor produces an induced draft on the combustion chamber so that backdrafting is minimized when the combustion door is opened. Flue Gas Temperature Sensor: Monitors flue gas temperature. Sensor Stem: The sensor stem has two functions: to provide a Low Water CutOff (LWCO) signal and to monitor the thermal storage tank water temperature (TST). Digital Controller: Starts the blower motor when a fire is started. Stops the blower motor when the fire has burned all of the wood. Uses digital feedback from the flue gas temperature sensor and sensor stem to ensure safe and efficient operation.
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ELECTRIC HEATING PACKAGE (OPTIONAL ACCESSORY):
The Electric Heating Package turns the GARN unit into an electric heating system. The Digital Controller (4) can interface with the utility’s off-peak/discounted rate programs. The following electronics and controls components are optional and must be purchased in addition to the standard GARN package: Electric Element Box: A UL® listed box bolts to the front of the GARN unit to protect the electric elements. Electric Element Box Cover: A cover for the Electric Element Box (5). Electric Element(s): A total of 3, 6, or 9 electric elements (5.5 kW at 240 VAC each) thread into the flanges on the front of the GARN unit. Sequencer: Turns the electric elements on one after another in sequence to provide a smooth and gradual power-up.
Lowest System Operating Temperature [°F] 110 125 145
200,000 150,000 100,000 75,000 60,000 50,000 40,000 30,000 20,000
6.4 8.5
5.2 7.0
3.7 5.0 7.4 9.9
12.7 10.4 16.8 13.8 20.9 17.2 25.0 20.6 31.0 25.5 40.9 33.7 60.1 49.5
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12.3 14.7 18.2 24.1 35.3
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Table 1: Time Between Firings (hours) Based on Heat Load and System Operating Temp. (assumes thermal storage temperature starts at 195°F)
© 2016 HY-C® Company
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Rev: 20160513 Supersedes: Init
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