FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
HVAC CONTROLS OR CONTROLLERS INCLUDING ALPHANUMERICDISPLAYSAND PUSH BUTTONS
Emerson Electric Company
a US Company
of 8000 WEST FLORISSANT AVENUE
ST. LOUIS,
MISSOURI 63136 USA
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE NATURE OF THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORME

FIELD
The present disclosure relates to controls or controllers for heating, ventilation, and air conditioning (HVAC) systems, which include alphanumeric displays and push buttons that may be used for selecting menu options, setting or adjusting operational parameters, recalling faults, etc.
BACKGROUND
This section provides background information related to the present disclosure which is not necessarily prior art.
The operational parameters of an HVAC appliance {e.g., furnace, air conditioner, etc.) may be set by using an HVAC control or controller. To set the operational parameters, a contractor, installer, or original equipment manufacturer may need to change the settings of one or more DIP (dual inline package) switches on the control or controller.
SUMMARY
This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
Exemplary embodiments are disclosed of controls for heating, ventilation, and/or air conditioning systems. In an exemplary embodiment, a control generally includes an alphanumeric display, a plurality of push buttons, and a processor. The processor is configured to receive a current user input through at least one of the push buttons and to determine a response to the current user input such as by using one or more previously received user inputs, if any, via one or more of the push buttons. The processor is also configured to implement the determined response, display a message on the alphanumeric display, and/or changing an operational parameter of the heating, ventilation, and/or air conditioning system.
In another exemplary embodiment of a control for a heating, ventilation, and/or air conditioning system, the control generally includes a plurality of multiple-segment light-emitting diode (LED) displays operable for displaying alphanumeric characters including

fault codes. The control also includes a plurality of momentary push buttons. The momentary push buttons and multiple-segment LED displays are configured to be usable for setting one or more values of one or more operational parameters of the control and for recalling fault codes for display by the multiple-segment LED displays. Exemplary embodiments are also disclosed of methods of controlling heating, ventilation, and/or air conditioning systems. In an exemplary embodiment, a method is performed by a processor of a control including an alphanumeric display, the control further including a plurality of push buttons. The method includes receiving a current user input through at least one of the push buttons and determining a response to the current user input. The determining is performed using one or more user inputs, if any, previously received through one or more of the push buttons. The method also includes implementing the determined response, displaying a message on the alphanumeric display, and/or changing an operational parameter of the heating, ventilation, and/or air conditioning system. Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
DRAWINGS
The drawings described herein are for illustrative purposes only of selected embodiments
and not all possible implementations, and are not intended to limit the scope of the
present disclosure.
FIG. 1 is a simplified diagram of a portion of a printed circuit board (PCB) of an HVAC
control or controller, the diagram showing DIP switches replaceable by an alphanumeric
display and push buttons in accordance with an exemplary embodiment of the present
disclosure;
FIG. 2 is a block diagram of an exemplary embodiment of a control or controller
including a microprocessor or micro-controller coupled with a key pad and an
alphanumeric display for setting operational parameters using the keypad;

FIG. 3 is a diagram of an exemplary embodiment of a human-machine interface (HMI)
menu structure for an HVAC control;
FIG. 4 is a diagram of an exemplary embodiment of a status display sequence for an
HVAC control; and
FIG. 5 is a flowchart illustrating an exemplary operational sequence for selecting a menu
and then setting or adjusting an operational parameter for the selected menu using the
control shown in FIG. 2 in accordance with an exemplary embodiment of the present
disclosure.
DETAILED DESCRIPTION
Example embodiments will now be described more fully with reference to the accompanying drawings.
Disclosed herein are exemplary embodiments of controls for heating, ventilation, and/or air conditioning (HVAC) systems. In various aspects, a control includes an alphanumeric display configuration having a plurality of multiple-segment displays, e.g., three seven-segment displays, etc. The control also includes a plurality of push buttons, and a processor configured to receive a current user input through at least one of the push buttons. The processor determines a response to the current user input. To make such a determination, the processor may use one or more previously received user inputs, if any, via one or more of the push buttons. Specifically and for example, the processor may use a sequence of signals from the push buttons, determine a length of time over which a signal is received from one of the push buttons, and/or determine a number of times a signal is received from one of the push buttons. To implement the determined response, the processor may display a message on the display configuration and/or change an operational parameter of the HVAC system. For example, at least one previous fault in the HVAC system may be displayed. Additionally or alternatively, the processor may change various operating parameters, including, but not limited to, a cooling off delay, outdoor tonnage, cubic feet per minute (CFM) per ton, heat off delay, inter-stage delay, and/or gas heating CFM.

Exemplary embodiments are disclosed herein of control boards for controllers or controls, which may be used with furnace controls (e.g., integrated furnace control (IFC), etc.), air handler controls, unitary controls, among other possible controls or controllers for residential HVAC or commercial HVAC. in an exemplary embodiment, a control includes an alphanumeric display configuration having a plurality of multiple-segment displays (e.g., light-emitting diode (LED) seven-segment displays, etc.) and a keypad with push buttons (e.g., two or more momentary push buttons, etc.) for setting operational parameters, recalling fault codes, etc. In operation, the LED display and keypad may be used far selecting a menu and then setting on adjusting an operational parameter for the selected menu. As another example, the LED display and keypad may be used for recalling a fault. As a further example, a control's delays may be set using the LED display and keypad.
With reference now to the figures, FIG. 1 illustrates a portion of a control printed circuit board (PCB) 20 including a DIP switch configuration 28 (shown in dashed lines).DIP switch configurations, which occupy considerable space on PCBs, are commonly used on conventional PCBs for HVAC controls. In various aspects of the present disclosure, such DIP switches may be replaced, e.g., by an alphanumeric display and push buttons that can occupy considerably less space than a DIP switch configuration. An example alphanumeric display (e.g., a LED display configuration 32,etc.) and example push buttons 36 are shown on the PCB 20 for the sake of comparison as to amounts of occupied board space.
FIG. 2 is a diagram of an example control lOOfor a heating, ventilation, and/or air conditioning system. The control 100 includes an alphanumeric display 108. In the present example embodiment, the alphanumeric display 108includes three (3) light-emitting diode (LED) seven-segment displays 112. In various aspects, an alphanumeric display may include one or more dot matrix displays, one or more multiple-segment displays having more than or fewer than sevei) segments, etc.
The control 100 also has a plurality of keys or push buttons, e.g., momentary push buttons 120aand 120bprovided on a keypadl 28 Although two push buttons (120a, 120b)

are shown in FIG. 2, more than two push buttons may be provided in alternative embodiments.
A microcontroller 132 includes a processor 136configured to receive a current user input through at least one of the push buttons (120a, 120b) and to determine how to respond to the current user input. To determine a response, the processor 136 may use one or more user inputs, if any, previously received via the push button(s) (120a, 120b). To implement the determined response, the processor 136 may, e.g., display a message on the alphanumeric display 108and/or change an operational parameter of the HVAC system. The microcontroller 132 also includes memory 140 in which, e.g., operational parameters may be stored and changed in response to user input via the push buttons (120a, 120b). FIG. 3 is a diagram of an example human-machine interface (HMI) menu structure 200, e.g., for the control 100. The menu structure 200includes a plurality of menus 208, e.g., a Status menu 210, an Error menu 212, a Last Four Faults menu 214, a Code Release Number menu 216, a Cooling Off Delay menu 218, an Outdoor Tonnage menu 220, a CFM/Ton menu 222, a Heat Off Delay menu 224, an Inter-Stage Delay menu 226, and a Heating CFM menu 228.
With the exception of the Status menu 210as further described below, each menu 208 provides one or more menu options 240. In the present example HMI menu structure 200, the Error menu 212 provides Active Error(s) 242, the Last Four Faults menu 214 provides History Error(s) 244, the Code Release Number menu 216provides a Code Release Number 246, the Cooling Off Delay menu 218 provides Cooling Off Delay Options 248, the Outdoor Tonnage menu 220 provides Ton Options 250, the CFM/Ton menu 222 provides CFM Options 252, the Heat Off Delay menu 224 provides Heat Off Delay Options 254, the Inter-Stage Delay menu 226 provides Inter-Stage Delay Options 256, and the Heating CFM menu 228 provides Heating CFM Options 258. In the present example embodiment, and referring to FIG. 2, the two push buttons (120a, 120b) may be used to navigate the menu structure200. One push button, e.g., the button 120a (a"menu key") may be used, e.g., to browse the menus208, and the other push button 120b (an "option key") may be used, e.g., to browse the menu options240. When

the menu key 120a is pressed, the alphanumeric display 108may show the next available menu 208, e.g., in a sequence and cycle indicated by arrows 270 in FIG. 3.When a user has activated a menu208, he or she may press the option keyl20bto navigate to and scroll through available menu option(s) 240, e.g., as indicated by arrows 274a and 274b in FIG. 3.
Status Menu
In the present example embodiment, activating the Status menu 210 causes a current operation mode of the HVAC system to be displayed in the alphanumeric display 108. Example operation modes and example corresponding display codes for an HVAC system are listed in Table 1.Of course, in general, various codes, abbreviations, fonts, etc. could be used in various aspects of the disclosure, depending on (among other things) the structure of an alphanumeric display used in a given embodiment. For example, where a seven-segment display is used, a font conforming to the seven-segment structure would be used in the display. In the tables and examples herein, fonts have been used (for the purpose of clarity of explanation) that would not necessarily conform to the structure of a given display.
Table 1. HMI Mode Display

MODE DISPLAY
#3 DISPLAY
#2 DISPLAY
#1
IDLE I D L
CONTINUOUS FAN C O F
COOLING C O L
MECHANICALHEAT H P
GAS HEAT G H 1
The display of a current operating mode may or may not be followed by a display of additional information. For example, FIG. 4 illustrates an exemplary embodiment of a status display sequence 300.As shown in FIG. 4, if a blower of the HVAC system is

running, a display 304of the current operating mode is replaced after, e.g., a one-second delay, by a display 308of the blower CFM, e.g., as a code beginning with "A" and followed by a two-digit number representing actual CFM to the blower divided by 100, rounded down to an integer. If an alarm is detected in the HVAC system, the display 308 of the blower CFM (or the display 304of the current operating mode, if the blower is not running) is replaced after, e.g., one second by a display 312 of an alarm error code. An error code is displayed in the alphanumeric display 108, e.g., as a code beginning with "E" and followed by a two-digit error code. If more than one alarm is active, then the alarm with the highest priority, or the latest alarm of equal-priority active alarms, may be displayed. Thus, for example, when more than one status is active, the active statuses may be displayed in a rotation in which an active status is displayed for one second, the alphanumeric display 108 is switched off for one second, the next active status is then displayed for one second, etc.
Example display codes for menus 208 and their corresponding menu options 240 are listed in Table 2.
Table 2. HMI Display Codes

Menu Menu Options
Display 3 Display
2 Display 1 Display 3 Display 2 Display 1
Status Menu N/A
Error Menu E R R E alarm code(s)
Last 4 Faults L 4 F E

Code Release Number C R CR Number

Menu Menu Options
Cooling
Off Delay C 0 D Delay, Seconds

Delay, Seconds

Delay, Seconds

E H
Outdoor Tonnage 0 D T Actual Tonnage

Actual Tonnage

Actual Tonnage

Actual Tonnage
CFM/Ton C P T Actual CFM/Ton

Actual CFM/Ton

Actual CFM/Ton
Heat Off Delay H 0 D Delay, Seconds

Delay, Seconds

Delay, Seconds

Delay, Seconds
Inter-Stage Delay I s D Delay, Seconds

Delay, Seconds

Delay, Seconds

Delay, Seconds
Gas
Heating
CFM G H C Actual CFM/10

Actual CFM/10

Actual CFM/10

Actual CFM/10
Error Menu
Referring again to FIG. 3, to navigate from the Status menu 210 to the Error menu 212, the user may press the menu keyl20aonce. The user thenpresses the option key 120bto browse all active alarm(s) in the Active Error(s) 242. If no alarm is active, the alphanumeric display 108shows "E", "0" and "O.'Tn the present embodiment, as many as four active alarms may be included in the Active Error(s) 242, although in other

embodiments, more or fewer active alarms may be shown. When an alarm is active, it is also included in the History Error(s) 244 for the Last Four Faults menu 214. Last Four Faults Menu
To navigate from the Error menu 212 to the Last Four Faults menu 214, the user may press the menu keyl20aonce. The user then presses the option key 120bto browse the last four faults in the History Error(s) 244. If no alarm is in the History Error(s) 244,the alphanumeric display 108 shows "E", "O" and "O".ln the present embodiment, as many as four history alarms may be included in the History Error(s) 244, although in other embodiments, more than or fewer than four history alarms may be shown. To clear all alarms from the History Error(s) 244, the user may, e.g., press the option key 120bfor five (5) seconds. The alphanumeric display 108may signal, e.g. ,"E", "0" and "0" intermittently, e.g., l/4 second on and 1/4 second off, to indicate that the alarm(s) are successfully removed. The alphanumeric display 108 then may return to the Last Four Faults menu 214. Code Release Number Menu
To navigate from the Last Four Faults menu 214 to the Code Release Number menu 216, the user may press the menu keyl20aonce. The user then presses the option key 210btoreview the code release number for firmware of the HVAC system. Cooling Off Delay Menu
To navigate from the Code Release Number menu 216 to the Cooling Off Delay menu 218, the user may press the menu keyl20aonce. The user then presses the option key 120bto browse Cooling Off Delay Options 248. In the present example embodiment, as many as four delay options may be made available in the Cooling Off Delay Options 248, although in other embodiments, more than or fewer than four delay options may be made available. In the present example embodiment and as shown in Table 2, three of the Cooling Off Delay Options 248 are displayed and selectable as numbers of seconds of delay. A fourth option, enhanced mode, may be displayed, e.g., as an "E" together with an "H."

Outdoor Tonnage, CFM/TON, Heat Off Delay, Inter-Stage Delay, Heating CFM Menus
The menus 220, 222, 224, 226, and 228and their corresponding menu options250, 252, 254, 256, and 258may be reached in the same or similar manner as previously discussed. In the present example embodiment and as shown in Table 2, Ton Options 250 may be displayed and selectable as numbers of actual tonnage. CFM Options 252 may be displayed and selectable as numbers of actual CFM per ton. Heat Off Delay Options 254 and Inter-Stage Delay Options 256 may be displayed and selectable as numbers of seconds of delay. Heating CFM option 258 may be displayed and selectable as numbers of actual CFM divided by 10.
If, e.g., the control 100 is in normal operation, a user-selected option becomes effective on the next valid call for heat or cooling. Generally, in various embodiments when a user browses menu options 240, a default option, or an option previously selected and currently in effect in the HVAC system, may be displayed first. Any additional available options for the corresponding menu 208may be subsequently displayed in response to user input, e.g., via the option key 120b.
It should be noted that other or additional menus, options and/or operating parameters and conditions could be included for display and/or selection in various embodiments. In various HVAC control embodiments, an option may be made available and selectable by a user's entry of a user-selected number or other character. For example, the user may hold down a momentary option key for a length of time corresponding to a digit or other character to enter that digit or character as an option value (or as part of an option value having more than one digit or character.) in such exemplary manner, the user is not limited to preset options but may enter a different option value. In various embodiments, such user-entered option values may be displayed in an alphanumeric display and used by the control, e.g., to change an operating parameter of the HVAC system. Referring again to FIGS. 2 and 3, at HVAC system power-up, a pre-designated signal may be displayed on the alphanumeric display 108 for a pre-designated time period, after which the Status menu 210 is displayed. Generally, while any menu 208other than the

Status menu 210 is displayed, if no signal from the push buttons 120a, 120b is received for a predetermined time period, e.g., 30 seconds, the control lOOmay return to display the Status menu 210automatically, without selecting any currently-displayed option. A control may be used for controlling operation of an HVAC system in accordance with one example method indicated generally in FIG. 5 by reference number 400. The method 400 shall be described with reference to the control 100 and the menu structure 200. In process 404, the Status menu 210is displayed, e.g., until in process 408 a key is detected as having been pressed. In process 412, it is determined which key was pressed. If both the menu keyl20a and the option key 120b were pressed, e.g., pressed simultaneously for more than 10 seconds, then in process 416 the control 100 resets system options to factory default values, flashes a pre-designated signal on the alphanumeric display 108 to indicate a successful reset, and returns to the Status menu 210 in process 404. If in process 412 it is determined that the menu key 120a was pressed, then in process 420 the control 100 proceeds to the next menu 208, which is displayed in process 424. In process 428, it is determined (a) that a key was pressed and (b) which key was pressed. If the menu key 120a was pressed, then in process 432, the control 100 proceeds to the next menu 208, e.g., in the pre-designated cycle shown in FIG. 3 (which cycle may resume with the Status menu 210, if the menu key 120a was pressed while the Heating CFM menu 228 was displayed).
If in process 428 the option key 120b was pressed, then in process 440a menu option 240 associated with the menu 208previously shown in process 424is displayed. In process 444, it is determined (a) that a key was pressed and (b) which key was pressed. If the menu key 120a was pressed, then the user has selected the displayed menu option 240. Accordingly in process 448, the control 100 saves the user selection, which may be e.g., a change to an HVAC system parameter, and returns to repeat the display of the associated menu 208 in process 424. If the option key 120b was pressed in process 444, it is determined in process 454 whether the current menu 208 makes more than one menu option 240 available. If yes, then in process 458 the next available menu option 240is displayed. Processes 428, 440, 444, 454, and 458 may be repeated as the user cycles

through the available menu options 240before selecting one (by pressing the menu key 120a.)If no additional menu options240are available, then the last-displayed menu option 240is displayed in process 440, until in process 444 it is determined that the user pressed the menu key 120a.
The method 400 is only one example of how a control may use an alphanumeric display and push buttons to display and present user options as to various system conditions, modes, and operating parameters. Other or additional selections and selection sequences may be provided for various types of systems.
In exemplary embodiments, the use of at least three seven-segment LED displays in conjunction with two momentary push buttons allow contractors, original equipment manufacturers (OEMs), etc. to establish the operational settings for the control and to use the same display for fault recall. This may be achieved by pressing one or more of the momentary push buttons to enter a menu. The menu may be a parameter setting menu, fault recall menu, or other.
With the LED displays and push buttons, exemplary embodiments of the controls or controllers disclosed herein may thus provide an improved display and user interface that is more user friendly and/or more appealing to end users {e.g., contractors, OEMs, etc.) as compared to some controls or controllers having DIP switches to set operational parameters and a single LED having a variety of blink rates to determine fault codes. As recognized by the inventors hereof, it can be difficult to set the DIP switches of an IFC to set the values for proper furnace operation. For example, the control's delays may have to be set externally using DIP switches and resistor networks. The DIP switches may also be restricted to be used for setting only limited parameters. It can also be hard to identify faults with historical codes correlated to the blinking of a single LED. Exemplary embodiments disclosed herein may use a plurality of momentary switches and a multi-digit LED display that may provide one or more of the following advantages, such as easier setup of the operational parameters, allowing features to be added to the control, easier parameter settings, reduced printed circuit board (PCB) space, added visual effect, cost savings, etc. One or more "modes" can be entered by means of button presses by

time and/or sequence. Settings can be changed to improve or affect operation. Parameter values can be set to substantially any appropriate value rather than fixed discrete values. Codes from past operation can be viewed to help understand problems or to better diagnose problems. Data about operation can be viewed to make improvements. Exemplary embodiments disclosed herein may be used with an Integrated Furnace Control (IFC), an air handler control, a unitary control for heating and/or cooling appliances, among other possible controls or controllers for residential or commercial HVAC appliances or systems. Accordingly, aspects of the present disclosure should not be limited to use with any one particular type of control or controller. Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail. In addition, advantages and improvements that may be achieved with one or more exemplary embodiments of the present disclosure are provided for purpose of illustration only and do not limit the scope of the present disclosure, as exemplary embodiments disclosed herein may provide all or none of the above mentioned advantages and improvements and still fall within the scope of the present disclosure. Specific dimensions, specific materials, and/or specific shapes disclosed herein are example in nature and do not limit the scope of the present disclosure. The disclosure herein of particular values and particular ranges of values for given parameters are not exclusive of other values and ranges of values that may be useful in one or more of the examples disclosed herein. Moreover, it is envisioned that any two particular values for a specific parameter stated herein may define the endpoints of a range of values that may be suitable for the given parameter (the disclosure of a first value and a second value for

a given parameter can be interpreted as disclosing that any value between the first and second values could also be employed for the given parameter). Similarly, it is envisioned that disclosure of two or more ranges of values for a parameter (whether such ranges are nested, overlapping or distinct) subsume all possible combination of ranges for the value that might be claimed using endpoints of the disclosed ranges. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a,""an," and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises,""comprismg,""including," and "having," are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed. When an element or layer is referred to as being "on,""engaged to,""connected to," or "coupled to" another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present.In contrast, when an element is referred to as being "directly on,""directly engaged to,""directly connected to," or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between,""adjacent" versus "directly adjacent," etc.).As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be

only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first,""second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as
"inner,""outer,,,"beneath,""below,""lower,""above,""upper;, and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.

We Claim;
1. A control for a heating, ventilation, and/or air conditioning system, the control
comprising:
an alphanumeric display;
a plurality of push buttons; and
a processor configured to:
receive a current user input through at least one of the push buttons; determine a response to the current user inputusing one or more previously received user inputs, if any, via one or more of the push buttons; and
implement the determined response, display a message on the alphanumeric display, and/or change an operational parameter of the heating, ventilation, and/or air conditioning system.
2. The control of claim 1, wherein the alphanumeric display is operable for displaying at least one previous fault in the heating, ventilation, and/or air conditioning system.
3. The control of claim 1, wherein the alphanumeric display comprises a multiple-segment display.
4. The control of claim 1, wherein the alphanumeric display comprises three seven-segment light-emitting diode (LED) displays.
5. The control of claim 1, wherein the processor is configured to determine a response to the current user input by determining a length of time over which a signal is received from one of the push buttons, and/or by determining a number of times a signal is received from one of the push buttons.
6. The control of claim 1, wherein:
the push buttons comprise a menu key and an option key; and
the processor is configured to determine a response to the current user input
based on a sequence of signals from the menu key and option key.

7. The control of claim 1, wherein:
the alphanumeric display, push buttons, and processor are configured to be usable for changing one or more operational parameters of the heating, ventilation, and/or air conditioning system, including at least one or more of a cooling off delay, outdoor tonnage, cubic feet per minute (CFM) per ton, heat off delay, inter-stage delay, and/or gas heating CFM; and/or
the control is configured such that the alphanumeric display is operable for displaying at least one or more of a current mode of the heating, ventilation, and/or air conditioning system, a currently active fault in the heating, ventilation, and/or air conditioning system, and/or a current cubic feet per minute (CFM) of a currently running blower of the heating, ventilation, and/or air conditioning system.
8. The control of claim 1, wherein the control is configured such that an operational parameter of the heating, ventilation, and/or air conditioning system is changeable in accordance with a menu option displayed on the alphanumeric display.
9. A control for a heating, ventilation, and/or air conditioning system, the control comprising:
a plurality of multiple-segment light-emitting diode (LED) displays operable for
displaying alphanumeric characters including fault codes; and
a plurality of momentary push buttons;
the momentary push buttons and multiple-segment LED displays configured to be
usable for setting one or more values of one or more operational parameters of the
control and for recalling fault codes for display by the multiple-segment LED
displays.
10. The control of claim 9, wherein:
the plurality of multiple-segment light-emitting diode (LED) displays comprises at
least three seven-segment light-emitting diode (LED) displays; and/or
the plurality of momentary push buttons comprises at least two momentary push
buttons.

11. The control of claim 9, wherein:
the momentary push buttons are configured to allow user selection of a parameter setting mode or fault recall mode by pressing one or more of the momentary push buttons; and/or
the control is configured such that an operational parameter of the heating, ventilation, and/or air conditioning system is changeable in accordance with a menu option displayed on the multiple-segment LED displays.
12. The control of claim 9, further comprising a processor configured to receive a current user input through at least one of the momentary push buttons, the processor further configured to determine a response to the current user input, by using one or more previously received user inputs, if any, via one or more of the push buttons and to implement the determined response, display a message on the multiple-segment LED displays, and/or change an operational parameter of the heating, ventilation, and/or air conditioning system.
13. The control of claim 12, wherein:
the momentary push buttons comprise a menu key and an option key; and
the processor is configured to determine a response to the current user input based
on a sequence of signals from the menu key and option key.
14. The control of claim 9, wherein:
the momentary push buttons and multiple-segment LED displays configured to be usable for changing one or more operational parameters of the heating, ventilation, and/or air conditioning system, including at least one or more of a cooling off delay, outdoor tonnage, cubic feet per minute (CFM) per ton, heat off delay, interstage delay, and/or gas heating CFM; and/or
the control is configured such that the multiple-segment LED displays are operable for displaying at least one or more ofa current mode of the heating, ventilation, and/or air conditioning system, a currently active fault in the heating, ventilation, and/or air conditioning system, and/ora current cubic feet per minute

(CFM) of a currently running blower of the heating, ventilation, and/or air conditioning system.
15. A method of controlling a heating, ventilation, and/or air conditioning system, the
method performed by a processor of a control including an alphanumeric display
and a plurality of push buttons, the method comprising:
receiving a current user input through at least one of the push buttons; determining a response to the current user input, the determining performed using one or more user inputs, if any, previously received through one or more of the push buttons; and
implementing the determined response, displaying a message on the alphanumeric display, and/or changing an operational parameter of the heating, ventilation, and/or air conditioning system.
16. The method of claim 15, wherein the method includesdisplaying a message on the
alphanumeric display including at least one or more of:
at least one previous fault in the heating, ventilation, and/or air conditioning
system;
a current mode of the heating, ventilation, and/or air conditioning system;
a currently active fault in the heating, ventilation, and/or air conditioning system;
and/or
a current cubic feet per minute (CFM) of a currently running blower of the
heating, ventilation, and/or air conditioning system.
17. The method of claim 15, wherein the method includes changing an operational
parameter of the heating, ventilation, and/or air conditioning system including at
least one or more of:
a cooling off delay, outdoor tonnage, CFM per ton, heat off delay, inter-stage delay, and/or gas heating CFM.
18. The method of claim 15, wherein:
the alphanumeric display comprises a multiple-segment display; and/or

the alphanumeric display comprises three seven-segment light-emitting diode (LED) displays.
19. The method of claim 15, wherein determining a response to the current user input
comprises:
determining a length of time over which a signal is received from one of the push
buttons; and/or
determining a number of times a signal is received from one of the push buttons.
20. The method of claim 15, wherein:
the push buttons comprise a menu key and an option key, and the method includes determining a response to the current user input based on a sequence of signals from the menu key and option key; and/or
the method includes changing an operational parameter of the heating, ventilation, and/or air conditioning system in accordance with a menu option displayed on the alphanumeric display.