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AQUATROL Zone Synchronizing
Boiler Reset Controls
AQ251
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
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: (_______) __________________________________________________________
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
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 ........................................................................
Familiarization with Control ..............................................
User Interface ..................................................................
LCD Display Panel Layout ................................................
Programming Instructions .................................................
Troubleshooting ................................................................
System Status and Error Codes .......................................
User Menu Structure .........................................................
CONTENTS
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Summary of Contents for Honeywell AQ251
- Page 1 AQ251 panel. Thanks to the network communication capability of the AQ251 controls, AQ1000 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:...
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Page 2: Familiarization With Control
- If the menu item being modified is a number, the displayed value will decrease/increase by pressing The AQ251 User Interface consists of an LCD screen (16 these buttons. When holding the – or + button for characters by 3 rows) and a 7 button keypad for navigating more than a second, the values automatically the menus as illustrated in Fig. -
Page 3: Lcd Display Panel Layout
HOME PAGE DISPLAY displayed. The option is automatically saved when the The Home Page is the default view displayed on the AQ251 indicator arrow is scrolled away from the value being Control Panel's LCD screen. -
Page 4: Programming Instructions
— The time display in 12 hour (e.g., 7:00 PM) or 24 hour format (e.g., 19:00). Program the AQ251 by using the keypad and LCD display to — Date and time of day – allows building owner to reset select parameters from the User Menu. Refer to Fig. 1 on day and time of day in the event of a power outage of page 2 for an illustration of the LCD screen and keypad. - Page 5 10:00P … NOTES: Schedule times are in 15-minute intervals. SAT WAKE 6:00A To have the AQ251 ignore a program change SAT LEAVE --:-- (and therefore keep the previous program's set- SAT RETRN --:-- point temperature), position the cursor beside the...
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Page 6: Troubleshooting
Boiler is in ready mode during Installer Setup. PMP EXER Boiler is disabled while the AQ251 is exercising all pumps and valves connected to the AQUATROL network. POST PURG Boiler is active with Post Purge operation and is sending the purged water to the Boiler (Primary) loop. - Page 7 System Status page of AQUATROL network, its settings are communicated to the the AQ251 indicating “Lost Zone A-xx”, where “xx” is the AQ251's Boiler Control Module (AQ1520M0) within 10 specific identity, or address, of the lost zone. This helps the seconds of being connected.
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Page 8: User Menu Structure
FACTORY DEFAULT TIMES FOR MON THROUGH FRI. FACTORY DEFAULT TIMES FOR SAT AND SUN. M27750 Fig. 3. User Menu Structure. AQUATROL® is a registered trademark of Honeywell International Inc. Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North...