Hydronic floor heating systems with features
A hydronic floor heating system as it relates to an HVAC apparatus, approach and system. Aspects of the present system and approach may include a radiant floor optimization mode, low floor temperature in vacation mode, modifying a 300 Hz, or so, reading principle base on implementation of Pseudo-random jittering of a reading event improving short-term accuracy of the individual readings, and a combination of hardware and software filters for using thermal sensors with extended cable length.
1. A hydronic floor heating system with floor heating elements, the system comprising:
a programmable thermostat controller comprising a display;
a first sensor configured to generate a signal indicative of an external temperature, wherein the first sensor is wired to the programmable thermostat with a cable in combination with a hardware filtration;
a second sensor configured to generate a signal indicative of an ambient temperature; and
a processor connected to the first and second temperature sensors,
wherein the processor is configured to present, via the display, a program schedule which allows a user to select one option when setting a low floor temperature limit, and
wherein the programmable thermostat includes software that contains a pseudo-random function which has a temperature reading interval of one or more seconds in a spread interval at random times.
2. The system of claim 1 , wherein the first sensor is connected to thermostat terminals and a measuring circuit.
3. The system of claim 2 , wherein the measuring circuit contains a capacitive low pass filter which filtrates interference at higher frequencies.
4. The system of claim 1 , wherein the processor is configured to present, via the display a Yes option to ignore low floor temperature limits during a set period and a No option to maintain the low floor temperature limit.
5. The system of claim 1 , wherein the program schedule allows the user to set a vacation mode by at least setting a single setpoint.
6. The system of claim 1 , wherein the programmable thermostat includes software that contains a more or less 300 Hz sampling process that ensures a filtering of 50 Hz and 60 Hz, or more or less than 50 Hz and 60 Hz.
7. The system of claim 1 , wherein the spread interval is at least +/−1/50 Hz.
8. The system of claim 1 , wherein the spread interval is at least +/−20 ms.
9. A hydronic floor heating thermostat configured to control one or more components of an HVAC system, the thermostat comprising:
a plurality of temperature sensors;
a display with buttons for selecting;
a controller configured to provide one or more control signals, wherein the controller is configured to assist a user in setting a temperature limit within the thermostat by at least providing a decisive selection within the display for the user to select or allow one temperature limit to be set, and in response perform an action; and
a processor configured to obtain temperature readings from the plurality of temperature sensors using a pseudo-random function which has a temperature reading interval of one or more seconds in a spread interval at random times.
10. The thermostat of claim 9 , wherein the decisive selection needs a Yes or No input from a user.
11. The thermostat of claim 9 , wherein the controller is configured to maintain only an “Away” setpoint based on a control mode.
12. The thermostat of claim 9 , wherein the plurality of temperature sensors are configured to measure at least external temperature and ambient temperature.
13. The thermostat of claim 9 , wherein the thermostat is connected to an external sensor using an extended cable of at least 5 m.