Honeywell AQ251 manual

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Table of contents for the manual

  • Page 1

    USER OPERATION AND MAINTENANCE 69-1979-04 AQUA TROL Zone Synchronizing Boiler Reset Controls AQ251 APPLICATION The AQ251 series of AQUA TROL® Boiler Reset Controls provides simplified, energ y-efficient outdoor temperature compensated control of sin gle-temperature, resid ential hydronic heating systems. The AQ251 easily converts a single zone hea[...]

  • Page 2

    AQUA TROL ZONE SYNCHRONIZIN G BOILER RESET CONTROLS 69-1979—04 2 T able 1. AQ251 Models AQ251 Approvals an d St andards: Canadian S tandards Association: Certified, File No. LR76030 Replacement Parts and Accessories: AQ1000: non-programmable zone thermostat AQ15100B: Replacement Boil er Reset Control Module AQ15740B: 4-zone valve expansion module[...]

  • Page 3

    AQUA TROL ZONE SYNCHRONIZI NG BOILER RESET CONTROLS 3 69-1979—04 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 probl ems. The layout of the display is lo gical and simple to n[...]

  • Page 4

    AQUA TROL ZONE SYNCHRONIZIN G BOILER RESET CONTROLS 69-1979—04 4 Programming Instructions Program the AQ251 by using the keypad and LCD display to select parameters from the User Menu. Refer to Fig. 1 on page 2 for an illustration of the LCD screen and keypad. NOTE: The figures in “User Menu S tructure” on page 8 provide a graphical layout of[...]

  • Page 5

    AQUA TROL ZONE SYNCHRONIZI NG BOILER RESET CONTROLS 5 69-1979—04 changes temporarily , requi ring the temperature to be at a comfort level 24 hours/day . UNOCC: In UNOCC mod e, the AQ251 holds the temperature of UNOCCUPIED programs (LEA VE and SLEEP). This might be used if the building will be unoccup ied for an extended period of time, such as a[...]

  • Page 6

    AQUA TROL ZONE SYNCHRONIZIN G BOILER RESET CONTROLS 69-1979—04 6 T ROUBLESHOOTING Power Disruption The AQ251’s system and ther mostat (zone settings) parameters are stored in non-volatile memory and are updated as they change. When a power disruption or lo ss of power occurs, the system configuration is retained in memory . When power is restor[...]

  • Page 7

    AQUA TROL ZONE SYNCHRONIZI NG BOILER RESET CONTROLS 7 69-1979—04 When a new AQ2000 component is conne cted on the AQUA TROL network, its settings are communicated to the AQ251's Boiler Control Module (AQ1520 M0) within 10 seconds of being connected. If the component is an AQ1000 thermostat, the setpoints for that zone thermostat can be modif[...]

  • Page 8

    AQUA TROL ZONE SYNCHRONIZIN G BOILER RESET CONTROLS Automation and Co ntrol Solutions Honeywell Internationa l Inc. Honeywell Limited-Hon eywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered T rademark © 2009 Honeywell Internationa l Inc. 69-1979—04 M[...]