THIS PROCEDURE MUST BE PERFORMED BY A QUALIFIED TECHNICIAN.
A low voltage (24VAC) room thermostat can be used for room temperature control with the ThermElect Hydronic system. If so, Steffes recommends using a digital thermostat. To initiate a heat call, the system needs a switch closure from R to H. This energizes the primary loop pump outputs.
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Comfort Plus Hydronic 12 Position Low Voltage Terminal Block Coding |
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|---|---|
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R = Low Voltage Hot |
O = Reversing Valve Input |
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C = Low Voltage Common |
O2 = Reversing Valve Output |
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Y = Compressor/Stage 1 Heat Call |
H = Hydronic Heat |
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W = Stage 2 Heat Call |
OS = Outdoor Temperature Sensor |
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Y2 = Compressor Output |
SC = Outdoor Temperature Sensor Common |
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G = Fan Call |
DS = Duct Temperature Sensor |
