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Honeywell RESET CONTROLS AQ251 User Manual

Aquatrol zone synchronizing boiler reset controls, Aq251, Warning

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USER OPERATION AND MAINTENANCE

69-1979-04

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

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.

CONTENTS

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

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: (_______) __________________________________________________________