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Williams 728
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  1. Lowtemp

    HVAC / radiant /hydronic gurus? help me identify this thermostat

    The cycling feature is shut off on your old thermostat. Look at the second dip switch. Yours is set to "on/off no compressor delay" The delay only works if that switch is set the other way. Hope that helps.
  2. Lowtemp

    HVAC / radiant /hydronic gurus? help me identify this thermostat

    That thermostat is discontinued. The time delay is only used if you have it hooked up for cooling. A normal thermostat can be used to replace this.
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