Product Manual — Doc. 8622E HZ-THSTAT • 10
Supported Systems
The HZ-THSTAT can control the following heating and cooling systems with or without Humidity
control:
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1 or 2-stage heat
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1 or 2-stage cool
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1 or 2-stage heat, 1 or 2-stage cool
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1 or 2-stage heat pump with 1 or 2 stage auxiliary heat
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1 or 2-stage dual fuel heat pump with 1 or 2 stage auxiliary heat
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Radiant floor only (floor warming and or space heating)
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1 or 2 stage heat (stage 1 radiant floor with or without floor warming), 1 or 2 stage cool
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1, 2, or 3 stage heat (stage 1 radiant floor with or without floor warming), 1 or 2 stage cool heat
pump with 1 stage aux heat
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1, 2, or 3 stage heat (stage 1 radiant floor with or without floor warming), 1 or 2 stage cool dual
fuel heat pump with 1 stage aux heat
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2-Pipe FCU with 1 or 2 Stage Heat/Cool, with Radiant Floor Stage and Floor Warming, and Aux
Heat Stage
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2-Pipe FCU with 1 or 2 Stage Heat, with Radiant Floor Stage and Floor Warming, and Aux Heat
Stage
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2-Pipe FCU with 1 or 2 Stage Cool, with Radiant Floor Stage and Floor Warming, and Aux Heat
Stage
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4-Pipe FCU with 1 Stage Heat/Cool, with Radiant Floor Stage and Floor Warming, and Aux Heat
Stage
NOTES:
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2-stage heating: Unlike traditional furnaces that turn on and run at full capacity with each
demand for heating, 2-stage heat operates like two separate furnaces to maintain a more
consistent temperature in the home. The unit starts out running in its first stage, and
operates at a fraction of its heating capacity. This reduced capacity is sufficient to warm the
home on mild winter days. But when the temperature outside goes very low, the furnace
adjusts to full capacity (second stage) to meet the demand for heat within the home.
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2-stage cooling: In warm weather, the first stage of the cooling equipment operates at a
fraction of the total cooling capacity. On very hot days, the second stage of the cooling
equipment energizes, and the cooling system operates at full capacity.
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