Honeywell AQ251 User Manual

AQUATROL Zone Synchronizing Boiler Reset Controls

AQ251

USER OPERATION AND MAINTENANCE

thermostats in the home can display the actual outdoor temperature when an outdoor sensor is connected to the AQ251 Control Panel.

WARNING

Only trained, experienced, licensed service technicians should service this Control Panel. The front cover of the AQ251 Control Panel should not be removed, as this will expose the user to potentially dangerous line voltage (120V) electricity.

Congratulations!

The AQUATROL AQ251 installed on your heating system is the most powerful, yet user-friendly hydronic heating control

APPLICATION

The AQ251 series of AQUATROL® Boiler Reset Controls provides simplified, energy-efficient outdoor temperature compensated control of single-temperature, residential hydronic heating systems. The AQ251 easily converts a single zone heating system into a room-by-room comfort control system, or upgrades a basic, relay-logic zoning system to intelligent “Zone of Greatest Demand” control with outdoor reset for increased energy efficiency and with reduced boiler cycling.

AQ251 boiler controls can ensure ample supply of hot water for both space heating and priority generation of domestic hot water for bathing, dishes and laundry.

When AQ1000 communicating thermostats are used with the AQ251 Zoning Modules, they can use the same wiring as existing thermostats. Night setback operation can be programmed from the AQ251 panel. Thanks to the network communication capability of the AQ251 controls, AQ1000

system available on the market for residential and light commercial installations.

This instruction sheet contains all the information you need to program the comfort settings of the AQ251 and to customize its operation for your home or business. For detailed information on the operation of this control, please consult the trained hydronic heating professional that installed the AQ251 control.

Application ........................................................................ 1

Familiarization with Control .............................................. 2

User Interface .................................................................. 2

LCD Display Panel Layout ................................................ 3

Programming Instructions ................................................. 4

Troubleshooting ................................................................ 6

System Status and Error Codes ....................................... 6

User Menu Structure ......................................................... 8

CONTENTS

This AQUATROL AQ251 Control Panel was installed by a trained hydronic heating contractor. To service this product, or for any questions relating to its installation, please contact:

Installing contractor: ________________________________________________________

Address: __________________________________________________________________

Phone: (_______) __________________________________________________________

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AQUATROL ZONE SYNCHRONIZING BOILER RESET CONTROLS

Table 1. AQ251 Models

Model Function DHW Zones Zone Control

AQ25142B Reset Boiler Control Panel

with integrated zoning

AQ25144B Reset Boiler Control Panel

with integrated zoning

AQ25110B Reset Boiler Control Panel

with no integrated zoning

Selectable DHW priority, with optional priority override

2 – 16, in sets of 4

2 – 16,

Line voltage circulators or 2-wire zone valves

24 Vac zone valves with end switches

in sets of 4

1 None; user can add zoning with

Expansion Zoning Panels (sold separately)

AQ251 Approvals and Standards:

Canadian Standards Association: Certified, File No. LR76030

Replacement Parts and Accessories:

AQ1000: non-programmable zone thermostat AQ15100B: Replacement Boiler Reset Control Module AQ15740B: 4-zone valve expansion module AQ15540B: 4-zone pump expansion module AQ10X38: 24 Vac 38 VA tran s f o r m e r AQ12C10: Replacement sensor, outdoor AQ12C11: Replacement sensor, supply and return on boiler

loop

AQ12C20: Replacement floor / slab sensor

FAMILIARIZATION WITH CONTROL

User Interface

The AQ251 User Interface consists of an LCD screen (16 characters by 3 rows) and a 7 button keypad for navigating the menus as illustrated in Fig. 1.

Keypad

The 7- button keypad provides the following functions. Menu Press this button to access the User Menu. When

pressed while in a sub-menu, the sub-menu’s values are saved before going up one level in the current menu.

Home Press this button to leave the User or Installer

Menu and return to the Home Page display screen.

OK Press this button to enter a sub-menu of the active

menu item. A menu item is active when the indicator arrow (←) is positioned beside the item.

and v Press these buttons to scroll up/down in the menu

items. Pressing one of these buttons automatically exits the edit mode, and the selection moves to the previous or next menu item.

– and + Press these buttons to decrease/increase the value

of a selected menu item, or to scroll through a list of pre-defined options.

- If the menu item being modified is a number, the displayed value will decrease/increase by pressing these buttons. When holding the – or + button for more than a second, the values automatically decrease/increase at a faster pace, similar to setting the time on a digital clock radio

- If the menu item is an option, pressing these buttons scrolls through the list of available options one at a time.

STATUS OF SYSTEM DEMANDS

- CALL FOR HEAT

- CALL FOR DHW

- SIGNAL ON AUXILIARY INPUT

GRAPHIC SHOWING THE PERCENTAGE OF THE BOILER’S HEATING CAPACITY

T WHICH IT’S

OPERATING; ARROWS

BOVE AND BELOW THE BAR SHOW THE TREND OF THE BOILER’S TEMPERATURE (UP OR DOWN)

STATUS OF LINE VOLTAGE OUTPUTS

- PRIMARY (BOILER) HEAT

- DHW PUMP

- AUXILIARY “PUMP” OUTPUT

STATUS OF SYSTEM OUTPUTS

- AUXILIARY OUTPUT ACTIVE

- BOILER T-T OUTPUT ACTIVE

DISPLAY AREA SHOWING SYSTEM STATUS AND MENU OPTIONS AND SELECTIONS MADE

DOWN ARROW, IF DISPLAYED, INDICATES THAT OTHER MENU ITEMS EXIST BELOW AND CAN BE VIEWED BY SCROLLING DOWN WITH THE BUTTON.

UP ARROW, IF DISPLAYED, INDICATES THAT OTHER MENU ITEMS EXIST ABOVE AND CAN BE VIEWED BY SCROLLING UP WITH THE BUTTON.

ARROW INDICATES THE CURRENTLY SELECTED “ACTIVE” MENU ITEM.

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Fig. 1. LCD Dot Matrix Display Layout.

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AQUATROL ZONE SYNCHRONIZING BOILER RESET CONTROLS

LCD Display Panel Layout

The LCD on the AQ251 Control Panel is used to:

— Monitor system status and performance. — Select and/or modify control settings for the hydronic

system.

— Diagnose and troubleshoot system problems.

The layout of the display is logical and simple to navigate. The information displays so that you can see at a glance the system’s operating temperatures, as well as the status of the system equipment, such as a call for heat, DHW pump ON, Boiler T-T terminals energized, etc. Fig. 1 on page 2 illustrates the layout and features of the LCD display panel and keypad.

LCD Display Navigation

This section describes how the keypad is used to navigate the LCD display and menus.

• The LCD displays up to three lines of text at a time. For menus with more than three lines, use the up and down buttons (

• As the menu is scrolled up or down, the indicator arrow (←) shows which menu item is active.

• If the active menu item is part of a list of predefined options (e.g., Day of the Week) press the – or + button to scroll through the available options until the preferred option is displayed. The option is automatically saved when the indicator arrow is scrolled away from the value being edited.

• If the active menu item requires you to define a value (e.g., a setpoint), use the – or + button to decrease or increase the value until the desired value is displayed. The selection will be saved when the indicator arrow is scrolled up or down.

or v) to scroll through the menu options.

NOTES:

1. When setting times for the setback schedule, you must

use the – or + button to change the time.

2. The OK button, when pressed, defaults the time setting to “--:--” (midnight).

• If the active menu item leads to a further sub-menu, pressing the OK button displays the sub-menu options on the LCD. Scroll through this sub-menu to position the indicator arrow (←) beside the desired menu item to input or modify. Choose one of the options provided or input the desired value for the menu item. When satisfied, scroll to another item and your selection will be saved.

• To define or modify another item within the same menu, scroll the up and down buttons ( arrow (←) is beside the desired option. Use the – or +

or v) until the indicator

buttons to set the value for that item.

• To move back (up) one level within a menu, press the Menu button.

• To return to the Home Page display, press the Home button.

NOTE: The AQ251 automatically returns to the Home Page

display after 60 minutes of inactivity on the keypad.

HOME PAGE DISPLAY

The Home Page is the default view displayed on the AQ251 Control Panel's LCD screen.

There are two Home Page views - Simple and Detail.

• Simple view shows 3 lines of text and is a brief description of the system operation.

• Detail view includes the same 3 lines plus 10 lines of additional information. Detail view is the factory default.

The choice of the Simple or Detail Home Page view is made from the USER MENU > PREFERENCES/TIME menu option.

HOME PAGE (SIMPLE)

HOME PAGE (DETAIL)

The Home Page display information for the Simple and Detail views is illustrated in Fig. 2.

LCD DISPLAY

WEDNESDAY 9:30A PROGRAM: LEAVE OUTDOOR: -5

WEDNESDAY 9:30A PROGRAM: LEAVE  RETRN SLEEP WAKE OCC UNOCC OUTDOOR: -5 TARGET: 180  WWSD BOILER: 180 RETURN: 160 DHW: 100 ZONE COUNT: 31

Fig. 2. Home Page displays (Simple and Detail).

KEYPAD

Home

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