Summary of the content on the page No. 1
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 A
Summary of the content on the page No. 2
AQUATROL ZONE SYNCHRONIZING BOILER RESET CONTROLS Table 1. AQ251 Models Model Function DHW Zones Zone Control AQ25142B Reset Boiler Control Panel Selectable DHW priority, with 2 – 16, Line voltage circulators or 2-wire zone with integrated zoning optional priority override in sets of 4 valves AQ25144B Reset Boiler Control Panel Selectable DHW priority, with 2 – 16, 24 Vac zone valves with end switches with integrated zoning optional priority override in sets of 4 AQ25110B Reset Boiler Control
Summary of the content on the page No. 3
AQUATROL ZONE SYNCHRONIZING BOILER RESET CONTROLS NOTES: LCD Display Panel Layout 1. When setting times for the setback schedule, you The LCD on the AQ251 Control Panel is used to: must use the – or + button to change the time. — Monitor system status and performance. 2. The OK button, when pressed, defaults the time — Select and/or modify control settings for the hydronic setting to “--:--” (midnight). system. — Diagnose and troubleshoot system problems. • If the active menu item leads to a
Summary of the content on the page No. 4
AQUATROL ZONE SYNCHRONIZING BOILER RESET CONTROLS — The time display in 12 hour (e.g., 7:00 PM) or 24 hour Programming Instructions 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. more than 4 hours (refer to Troubleshooting section). — The
Summary of the content on the page No. 5
AQUATROL ZONE SYNCHRONIZING BOILER RESET CONTROLS changes temporarily, requiring the 2. Programming all days at the same time: temperature to be at a comfort level 24 • Select EDIT ALL DAYS from the Program Settings hours/day. sub-menu. UNOCC: In UNOCC mode, the AQ251 holds the • A sub-menu displays where you can change the temperature of UNOCCUPIED programs WAKE program time for all days, the LEAVE (LEAVE and SLEEP). This might be used if program time for all days, etc. the building will be
Summary of the content on the page No. 6
AQUATROL ZONE SYNCHRONIZING BOILER RESET CONTROLS Upon restart, the AQ251 displays its clock settings as: YEAR TROUBLESHOOTING = 2008, MONTH = JAN, DATE = 1. The message PLS SET DAY/TIME displays. This displayed message continues until the DATE and TIME OF DAY are updated. Power Disruption The AQ251’s system and thermostat (zone settings) NOTE: If the power failure parameter is set to Backlight parameters are stored in non-volatile memory and are (USER MENU > PREFERENCES/TIME), the LCD u
Summary of the content on the page No. 7
AQUATROL ZONE SYNCHRONIZING BOILER RESET CONTROLS Table 2. LCD Status Notices and Error Messages. (Continued) LCD Display Parameter Meaning NO RETURN PROBE n/a No return sensor connected or it is defective. NO SUPPLY PROBE n/a No supply sensor connected or it is defective. SHORT CYCLE PROT n/a There is a call for heat, but less than two minutes have elapsed since the last firing of the boiler (prevents short cycling). VALVE INIT n/a Motorized mixing valve controlling the secondary loop is being
Summary of the content on the page No. 8
AQUATROL ZONE SYNCHRONIZING BOILER RESET CONTROLS USER MENU STRUCTURE Press the Menu button on the keypad to display the User Menu. Fig. 3 illustrates all possible User Menu selections. USER MENU SYSTEM STATUS PREFERENCES/TIME ZONE SETTINGS PROGRAM SETTINGS STATISTICS 1 SYSTEM STATUS PREFERENCES / TIME ZONE SETTINGS (All or Single) PROGRAM SETTINGS STATISTICS AUX IN EM.SHUT MODE: AUTO LAST DATA RESET: 2000 JAN 01 BOILER UNITS: °F EDIT ALL ZON
