automatic water heater control system

2021/05/21

After the heating is completed screen displays "completed". Thanks in advance. In one case, the offset may be 9 degrees. Although the invention has been described with respect to at least one illustrative example, many variations and modifications will become apparent to those skilled in the art upon reading the present specification. Also, the temperature of the inlet flow may vary with the source of the inlet flow. All controls, switches and fill/drain valves,materials (except heater) are supplied along with complete installation and wiring instructions. No. Owner name:

The heating element is positioned in the heat exchanger tank and is configured to heat the liquid passing through the water tank from the inlet to the outlet. Second is to change the code. Does the connection and codes are the same? Plastic case USB mobile charger Rotary encoder Display Arduino pro mini 5v Relay module Switch Knob AC Socket Temperature sensor Buzzer 10k SMT resistor 4.7k resistor 1k resistor3-pin Mains cord SPDT Slide switch Immersion Water Heater. Alternatively, the temperature of the mixed flow may be measured by other temperature sensors known in the art, such as thermocouples, resistance temperature detectors (RTDs), thermistors, and the like. 5, and is obtained by empirical testing.

The thermostat then calls for more heat to be supplied to the water, but by that time much of the storage tank is filled with unheated water. control water heater remote gas rheem tankless temperature residential system parts heaters wired main The shell 30 may be manufactured from ANSI SA-53 grade B carbon steel pipe. FIG.

Hello Sir Sandilya. Finally, for fire rates greater than about 66%, both the first and second circuits supply current as controlled by their respective contactors 100 and 102, and the third circuit is adjusted to meet the remaining percentage. For the exemplary heater, a 100% fire rate corresponds to 20 mA and 0% fire rate corresponds to 4 mA.

Did you make this project? It is contemplated, however, that this is only an example, and that the stacking rate of change threshold value may be any suitable value, depending on the application.

The heat exchanger tank 12 may be constructed from an upright, substantially cylindrical shell 30, having an upper circular flange 32 and a lower circular flange 34. At step (6), the tuning valves 62 and 82 are adjusted again to satisfy a second condition, i.e., that the temperature of the mixed flow is a predetermined temperature, i.e., about 3-4 F., lower than the setpoint temperature. It is therefore the intention that the appended claims be interpreted as broadly as possible in view of the prior art to include all such variations and modifications. At other times of the day, demand will be lower, and the flow rate will also be lower. The temperature sensor 26 is preferably a Balco wire, such as a Balco wire manufactured by Minco Products, Inc., of Minneapolis, Minn. As is known in the art, the Balco wire is a resistive element whose resistance changes with temperature. Water flow rates through the water heating system 10 depend, in part, on the demands by the users as described above, and thus may vary during operation. 5. Inline/Circulation Water Heater brochure. The inlet flow pipe 16 and the outlet flow pipe 20, may each be 2 inch diameter pipes, manufactured from standard carbon steel pipe and attached to the shell by welding. 2 is a perspective view in partial section illustrating a portion of the water heating system in accordance with the invention. In the exemplary embodiment, the heater 14 includes 27 heating elements 40 which are controlled by three circuits, as described below. Thank You in Advance Sir. The water flow continues through the copper tube 64, to a second compression fitting 68, and to a tee connector 70, which may be manufactured from carbon steel. If stacking is detected, then the setpoint for the heater may be lowered so that the outlet water temperature is within a safe limit. An orifice disk 52 or similar structure may be positioned inside the inlet flow pipe 16, slightly downstream from the inlet diverting pipe 18 to divert a portion of the inlet flow to the inlet diverting pipe 18. "use strict"; In an alternative water heater approach (not shown), the heat output may be controlled by an electric current flow through a resistive heating element. Steps (7) through (9) are repeated for each additional data point; preferably, the process is repeated for fire rates of 30% to 90% at 10% increments. Alternative materials may be used, such as, for example, carbon steel with a polyimide coating, or a copper-nickel alloy, such as C 70600, or a glass fiber material, such as vinylester resin. Copyright 2005 - var mdate = new Date(); document.write(mdate.getFullYear()); Southeast Church Supply. The temperature control system comprises a temperature sensor configured to determine the temperature of the mixed flow in the mixed flow pipe.

Each resistor wire 44 is connected to a respective terminal pin 50 (only one of which is shown in FIG. the constant is in a range from one degree to five degrees F.; and. SECURITY INTEREST;ASSIGNOR:ADEMCO INC.;REEL/FRAME:047337/0577, Owner name: A voltage is applied across the wire, and the voltage drop is used to calculate the temperature. thank you. Each TCU combines precise, automatic temperature control with easy operation for unmatched reliability and performance. Conversely, less or no heat is produced if the current is reduced or turned off, respectively.

The first pattern may include frequent small to medium water draws and heating. An exemplary load controller is Model BLC Series Base Load Controller manufactured by HDR Power Systems, Inc. of Columbus, Ohio. As yet another alternative, a plurality of contactors may be utilized to provide incremental control, with increased control provided by increasing the number of contactors. During this second iteration, the adjustment of tuning valves 62 and 82 at steps (3) and (6) is performed to arrive at a single setting for each tuning valve that satisfies both the first condition and the second condition. The exemplary heater 14 described above is controlled by three circuits, and each circuit is configured to handle approximately 33% of the power to the unit. This stacking detection technique may be based on the water heater heating/cooling behavior and water draw timing.

At step (2), the flow rate and the temperature of the inlet flow are adjusted until the temperature of the outlet flow is at the setpoint temperature, which is typically 130 F. At step (3), the tuning valve 62 on the inlet flow diverting pipe 18 and the tuning valve 82 on the outlet flow diverting pipe 22 are each adjusted to satisfy a first condition, i.e., that the temperature of the mixed flow is a predetermined temperature, i.e., about 1-2 F., above the temperature of the outlet flow. the controller determines a water temperature change rate from the sense signal; the controller provides the control signal according to the water temperature set point mechanism and the sense signal; and. Were from the Philippines.

The temperature sensor may sense the water temperature at or near the bottom of the water heater tank, which during stacking is less than the water temperature set point, even though the water at or near the top of the water heater tank may be substantially hotter than the water temperature set point. Subsequently, steps (1) through (6) are repeated. All functions of this Complete Automatic Control System are operated by one 3-way "on," "off," "drain" switch. A water heater may have at least one heating element or heater, such as a gas-fired burner and/or electric element. is if it 220V or 5V. the controller detects stacking and compensates the set point mechanism according to the sense signal to keep temperature stacking of the water within a safe limit.

For the Temperature Adjust, is it possible to do that automatically like turn it off and on when the temperature reaches a certain degree. Solder wire for 220v input and 5v output. Aerco International, Inc. (Northvale, NJ), 392/465, 392/498, 122/14.1, 122/13.07, 392/485, 392/474, 392/466.

Attach that bracket to the immersion water heater so as to fit the temperature sensor and secure the wire with zip tie.Note: Since the temperature sensor is fitted very near to heating element, temperature raises very fast and the heater will be shutdown. (function (d, t) { Where is the updated schematic diagram? The present invention pertains to thermal control systems and particularly to control systems for water heaters. A portion of the flow in the inlet flow pipe 16 is diverted into an inlet diverting pipe 18, which may include several components. If significant stacking exists in the tank, then the bottom water may be heated much faster than the top water. generation, Electric instantaneous water heater with enhanced temperature control, Dynamically-stopped and statically-balanced valve, <- Previous Patent (Apparatus and method). 19, 2007, which has the same assignee as the present application. The flow rates and inlet temperatures used in steps (2) and (5) in the first iteration are used in the second iteration. You also have the option to opt-out of these cookies. Only when the heating rate is high enough (and the burner has been on for a long time) may the setpoint offset be reduced. Necessary cookies are absolutely essential for the website to function properly. After completion please upload image. 2004-2022 FreePatentsOnline.com.

A first tuning valve on the inlet flow diverting pipe is provided to control flow in the inlet diverting pipe. Sir! The present invention may include another approach and several changes and/or additions to the approach indicated herein and in U.S. patent application Ser. All rights reserved. To recap, stacking may happen when water draw and heating fall into one of the following patterns. All the connections are same. This system has a buzzer i.e., when the water is heated buzzer starts to sound. To take advantage of the heat-rises principle, the heater is typically located at or near the bottom of the water heater tank. These cookies do not store any personal information. electric elements or furnace tubes with furnace tubes with submerged combustion chamber, Electronics And Telecommunications Research Institute, " "". Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. The mixed flow temperatures at 10% fire rate and 100% fire rate are recorded. I used EEPROM library for last memory. & Terms of Use.

A further object of the present invention is to provide an empirical relationship between the temperature of a mixed flow of inlet water and outlet water and the current applied to the heating element to maintain the setpoint temperature. The inlet flow diverting pipe 18 may be connected to the inlet flow pipe 16 by a 2 carbon steel weldolet 50. In one example case, the normal temperature set point may be, for example, 135 degrees Fahrenheit (F) and the differential may be 10 degrees. Also, the heating cycles may occur relatively often. What is the problem sir? Consequently, water flow rates may be in the range of about 0 gpm to about 10 gpm for the exemplary embodiment, and about 60 gpm for larger capacity water heating systems in accordance with the invention. The resulting relationship is plotted in a table, such as the exemplary table illustrated in FIG. While the water heating system disclosed in the '547 patent was a substantial improvement over the prior art, the present invention seeks to go even further and provides an electric water heating system that provides substantially constant temperature control with reduced complexity and cost to manufacture the system. Sir were having a trouble. During subsequent operation of the water heater, processing block, If, however, the rate of change of the water temperature does not exceed the stacking rate of change threshold value, as determined in decision block, If the rate of change of the water temperature is greater than the stacking rate of change threshold value, then, in block, If the burner has been activated for a period of time that is greater than the burner on recovery time, then, in block, If the burner has not been activated for a period of time that is greater than the burner on recovery time, then, in block, If the burner has been off for a period of time greater than the burner off recovery time, then, in block, If the burner has not been off for a period of time greater than the burner off recovery time, then, in block, Each time the control sequence is called, in decision block, If the offset is greater than zero and the BurnerOffTime is greater than the OffRecoveryDelay, then, in block, If WaterTemperature is less than the set point minus the offset minus the differential, then the control sequence moves to block, After the burner has been turned on, in decision block, If both the offset is greater than zero and the BurnerOnTime is greater than the BurnRecoveryDelay, then, in block, If WaterTemperature is greater than the Set point minus the offset, then the control sequence moves to block. 11/764,940, filed Jun. It may be noted that deep water draws normally do not cause stacking after heating. But opting out of some of these cookies may have an effect on your browsing experience. When turned ON for first time we have to set down the temperature because the default temp is above 100 c. To change the temperature click the button of rotary encoder.

1. For example, if the process controller commands 25% fire rate to the heater, the third circuit is adjusted to about 75% of the third circuit's total output. 11/764,940, filed Jun. In this version I added temperature adjustment using rotary encoder and also added a display. All such other embodiments, therefore, are intended to be included within the spirit and scope of the appended claims. For an incompressible fluid such as water, the heat capacity c is constant. In some cases, the offset may be from 1 degree to 20 degrees, as desired. can you please picture the whole circuit. The water heating system in accordance with the invention maintains the temperature of the outlet flow by adding heat to the water in the heat exchanger tank 12. if the temperature change rate is small during a long burn time, then the set point is not returned to an initial setting; and. upon subsequent heating of the water by the heating element, if the water temperature change rate is greater than N times the base heat rate where, N is greater than one, then set point is reduced M degrees. A temperature measurement device, such as a Balco wire or thermocouple, is placed in the outlet flow pipe 20 to measure the outlet temperature, along with the mixed flow temperature sensor 26, described above, to measure the temperature of the mixed flow. Water heaters often heat water using the heat rises principle. The mixed flow passes through the mixed flow pipe 24, which may include a close nipple 90 connected to a second tee connector 92. In order to prepare this graph, temperature measurements are made of the outlet flow and the mixed flow. A water heater control system comprising: a water temperature sensor for providing a sense signal indicative of a temperature of water proximate to the sensor; a heating element for heating water proximate to the element according to a control signal; and, a controller having a water temperature set point mechanism for receiving the sense signal and for sending the control signal; and. One is placing the sensor away from the heating element.

5 is loaded into the process controller 96 as a table look-up function. FIG. Thanks for letting me know.

The temperature control system modulates the current to the heating element in response to the temperature of the mixed flow based on a predetermined empirical relationship between the current applied to the heating element and the temperature of the mixed flow. The inlet flow pipe 16 is located towards the top of the shell 30 and communicates with the interior of the shell 30. There are two ways to rectify this problem. As illustrated in FIG. No. The fire rate is percentage of fall current.

4, the temperature of the mixed flow is detected by the temperature sensor 26.

These and other features, aspects, and advantages of the present invention will become better understood with regard to the following detailed description, appended claims, and accompanying drawings. Thank You in advanced sir.