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Duty cycle control for hot water boiler
I have a pretty typical 196's 6 unit with a central hw cast iron boiler and unit thermostats. Since these buildings tend to need little heat due to internal gains, outdoor reset is useless since the system can heat the structure with 140F water on the design day. What I need is a simple duty cycle control, like those for steam, without the additional return sensors, etc. to prevent abuse of the "free" heat by tenants . Any ideas who makes these..remember cost is an issue since this is a very small building as are several others I am working with. This should be a very simple control.
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