Method of controlling boiler

Abstract

Disclosed herein is a method of controlling a boiler. In the boiler control method, the boiler is controlled depending both on a room temperature and on a return water temperature, whereby, unnecessary operation of the boiler is minimized. Further, the boiler is controlled depending on a desired room temperature and a corresponding return water temperature in a non-sleeping time zone, and the boiler is variably controlled, in the sleeping time zone, within a variable sleeping-time room temperature range and a variable sleeping-time return water temperature range. Moreover, in the present invention, a temperature control deviation is within ±0.5° C. and a return water temperature control deviation is within ±1° C. so that the room temperature and the temperature of a floor of the room can be maintained constant. Thus, energy consumption can be markedly reduced.

What is claimed is: 
     
         1 . A method of controlling a boiler comprising a boiler control unit and a room controller, the method comprising:
 turning on the boiler;   setting a room-temperature-corresponding return water temperature;   setting a room-temperature-corresponding variable sleeping-time room temperature;   setting a variable sleeping-time return water temperature corresponding to the variable sleeping-time room temperature;   setting a desired room temperature using a temperature setting switch;   sensing a room temperature using a room temperature sensor;   sensing a return water temperature using a return water temperature sensor;   determining a current time using a timer; and   determining whether the current time is in a non-sleeping time zone or a sleeping time zone,   wherein at the determining whether the current time is in the non-sleeping time zone or the sleeping time zone, when the current time is in the non-sleeping time zone, the boiler is controlled under a non-sleeping time zone control mode, and when the current time is in the sleeping time zone, the boiler is controlled under a sleeping time zone control mode,   wherein the sleeping time zone control mode comprises comparing the room temperature sensed by the room temperature sensor with the variable sleeping-time room temperature,   wherein at the comparing the room temperature with the variable sleeping-time room temperature,   when the room temperature is higher than the variable sleeping-time room temperature, operation of the boiler is stopped, and   when the room temperature is lower than the variable sleeping-time room temperature, the sleeping time zone control mode further comprises comparing the return water temperature with variable sleeping-time return water temperature, wherein at the comparing the return water temperature with variable sleeping-time return water temperature, when the return water temperature is lower then the variable sleeping-time return water temperature, the boiler is operated, and when the return water temperature is higher than the variable sleeping-time return water temperature, the operation of the boiler is stopped.   
     
     
         2 . The method as set forth in  claim 1 , wherein the non-sleeping time zone control mode comprises
 comparing the room temperature sensed by the room temperature sensor with the desired room temperature,   wherein at the comparing the room temperature with the desired room temperature,   when the room temperature is higher than the desired room temperature, the operation of the boiler is stopped, and   when the room temperature is lower than the desired room temperature, the non-sleeping time zone control mode further comprises comparing the return water temperature with the room-temperature-corresponding return water temperature, wherein at the comparing the return water temperature with the room-temperature-corresponding return water temperature, when the return water temperature is lower than the room-temperature-corresponding return water temperature, the boiler is operated, and when the return water temperature is higher than the room-temperature-corresponding return water temperature, the operation of the boiler is stopped.   
     
     
         3 . The method as set forth in  claim 1 , wherein the room-temperature-corresponding return water temperature is set to a temperature higher than the desired room temperature by 10° C., the room-temperature-corresponding variable sleeping-time room temperature is set to a temperature lower than the desired room temperature by from 1° C. to 3° C., and the variable sleeping-time return water temperature corresponding to the variable sleeping-time room temperature is set to a temperature lower than the room-temperature-corresponding return water temperature by from 1° C. to 3° C. 
     
     
         4 . The method as set forth in  claim 1 , wherein signal transmission between the boiler control unit and the room controller is conducted by an interface RS 485. 
     
     
         5 . The method as set forth in  claim 1 , wherein signal transmission between the boiler control unit and the room controller is conducted by an interface power line modem. 
     
     
         6 . The method as set forth in  claim 1 , wherein signal transmission between the boiler control unit and the room controller is conducted by an interface RF or Bluetooth. 
     
     
         7 . The method as set forth in  claim 1 , wherein a temperature control deviation of the return water temperature sensor is within ±1° C., and a temperature control deviation of the room temperature sensor is within ±0.5° C. 
     
     
         8 . The method as set forth in  claim 1 , wherein in the sleeping time zone control mode,
 the variable room temperature is varied in such a way that at a sleep start time, the variable room temperature is equal to the desired room temperature, is gradually reduced from the sleep start time to a predetermined time of a sleeping time zone, is maintained for a predetermined duration, is gradually increased again to a wake-up time, and then is equal to the desired room temperature at the wake-up time, and   the variable return water temperature has a temperature variation value equal to a temperature variation value of the variable room temperature from the sleep start time to the wake-up time.   
     
     
         9 . The method as set forth in  claim 2 , wherein in the non-sleeping time zone control mode,
 the variable room temperature is equal to the desired room temperature during the non-sleeping time zone, and   the variable return water temperature has a temperature deviation equal to a temperature deviation of the variable room temperature during the non-sleeping time zone.