초록 ▼

A control unit and a related method of operation for controlling the temperature of the water circulated in the radiant loop of a hydronic heating system. The control unit includes temperature setting dials that can be used to adjusts the reset curve used to determine the desired secondary, radiant

A control unit and a related method of operation for controlling the temperature of the water circulated in the radiant loop of a hydronic heating system. The control unit includes temperature setting dials that can be used to adjusts the reset curve used to determine the desired secondary, radiant loop water temperature. The control unit generates a linear reset curve between two setpoints such that the control unit can calculate a desired secondary loop water temperature based on the reset curve and the present outdoor air temperature. The control unit monitors the temperature of the water returning to the boiler from both the primary loop and the secondary, radiant loop. The control unit monitors the return water temperature over a first interval and, based on the rate of change in the return water temperature, calculates a predicted return water temperature at a second interval in the future. If the predicted return water temperature is lower than the user-selected minimum return water temperature, the control unit operates the modulating valve to reduce the amount of heated water flowing to the secondary, radiant loop.

대표청구항 ▼

[ We claim:] [1.] A hydronic heating system including a main boiler and a circulating pump for circulating a supply of heated water between a primary loop and a secondary, radiant loop coupled to the primary loop by a modulating valve, the system comprising:a control unit in communication with the m

[ We claim:] [1.] A hydronic heating system including a main boiler and a circulating pump for circulating a supply of heated water between a primary loop and a secondary, radiant loop coupled to the primary loop by a modulating valve, the system comprising:a control unit in communication with the modulating valve to control the amount of heated water to the secondary, radiant loop, wherein the control unit comprises:a maximum radiant loop water temperature dial used to set a maximum radiant loop water temperature;a minimum radiant loop water temperature dial used to set a minimum radiant loop water temperature;a maximum outdoor air temperature dial used to set a maximum outdoor air temperature; anda minimum outdoor air temperature dial used to set a minimum outdoor air temperature;wherein the control unit calculates a linear reset curve based on the maximum radiant loop water temperature, the minimum radiant loop water temperature, the maximum outdoor air temperature, and the minimum outdoor air temperature and operates the modulating valve to control the temperature of the water in the secondary, radiant loop based on the calculated linear reset curve.