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Environmental & Combustion Controls
AQ2514B4
Aquatrol Boiler Reset Control Panel

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Overview
The AQ251 family 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 in-creased energy efficiency 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.

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Features

• Use with AQ1000 2-wire polarity-insensitive communicating thermostats (AQ2514B2 and AQ2514B4) or dry contact thermostat (AQ2511B0).
• 0-10 Vdc modulating output for driving a modulating/condensing boiler.
• Displays outdoor temperature on all thermostats when used with an AQ12C10 outdoor sensor (included).
• Intuitive programming interface and armchair programming (can be programmed at your desk and taken to the job site "ready-to-install")
• Customizable control settings and schedules allow for greater level of control and comfort.
• Central programming of zone set points and setback.
• 1-stage zoning.
• Zoning Control for up to four zones as shipped; can be expanded to a total of 16 zones with AQ255 or AQ257 expansion zoning panels, and up to 64 zones by using AQ254 Add-a-Temperature expansion panels.
• Outdoor temperature compensation (reset), or Load reset based on indoor temperature feedback.
• Zone synchronization through Zone of Greatest Demand control.
• Domestic hot water priority and priority override protection.
• Line or low-voltage output for zoning equipment (pumps or valves).
• Boiler short cycling protection.
• Boiler post purge.
• Freeze protection.
• Pump/valve exercise.
• Boiler shock prevention from cold water returning to boiler.
• Automated test and purge feature for quick start-up and simplified troubleshooting.
• Integral 38 VA transformer with self resetting electronic fuse.
• 2 hour power supply (super-capacitor) to retain day and time settings during power outage.
• Non-volatile EPROM memory retains program settings during power outage.
Product Specifications  Back To Top
Application Boiler reset control for hydronic zoning system
Thermostat Compatibility AQ1000 Series 2-wire communicating thermostats
Setback Program 7 day, up to 2 setback periods/day.
User Interface (Setting, Programming) LCD Display and a 7 button Key Pad
Number of Communicating Zones Controlled 4
Boiler (Supply) Max. Control Temperature (F) OFF, 120F to 225 F
Boiler (Supply) Max. Control Temperature (C) OFF, 49C to 107 C
Boiler Min. Control Temperature (F) OFF, 59F to 180F
Boiler Min. Control Temperature (C) OFF, 15C to 82C
Outdoor Low Design Control Temperature (F) -60F to 32F
Outdoor Low Design Control Temperature (C) -51C to 0C
Return Min. Control Temperature (F) 80 F to 180 F
Return Min. Control Temperature (C) 27C to 82C
Boiler Differential 2F to 41F (1C to 23C), or Auto (minimum 2 minutes on time)
Boiler Heat Post Purge Off, 10 seconds to 30 minutes (factory default is 30 seconds)
Pump/Valve exercise 30 seconds per 2 weeks of space heating inactivity
Power Supply 120V/60Hz
R-C Output (on transformer) 38 VA, 24 Vac Class II
R-C Input (on Control and Zoning Modules) 24 Vac Class II (input on Control and Zoning Modules)
Supply/Return Sensor Lead Length: 10 ft. (3050 mm). 10 kilohm NTC thermistor at 25 C (77 F) +/- 0.5F (+/-0.3C) up to 500 ft (150 M) using 18 AWG or larger wire, beta=3892.
Auxiliary (Demand) Input External dry contacts connection only
Heat Demand (Thermostat R-W) Input External dry contacts connection only
DHW Demand Input External dry contacts connection only
Boiler (T-T) Output Rating 24 Vac, 0.5A, 12VA
Auxiliary Low Voltage Output Rating 24 Vac, 0.5A, 12VA
B-B Communication Bus Terminals Low voltage, Class II, 2-wire polarity-insensitive, digital communicating link to other Control or Zoning modules.
Zone Module Thermostat input Low voltage, Class II, 2-wire polarity-insensitive, digital communicating with power link to AQ1000 series thermostat.
Boiler Pump Output Rating 120 Vac/250 Vac 5A, 1/3HP
DHW Pump/Valve Output Rating 120 Vac/250 Vac 5A, 1/3HP
Auxiliary Pump Output Rating Dry contact output, 120 Vac/250 Vac 5A, 1/3 HP
Zone Output Contact Rating Pumps: 120 Vac/250 Vac, 5A, 1/3 HP
Zone Output Contact Rating Valves: 24 Vac, 0.5 A, 12 VA
Control and Zoning Panel Temperature Rating (F) 32 F to 130 F
Control and Zoning Panel Temperature Rating (C) 0 C to 55 C
Operating Humidity Range (% RH) 5 to 90% RH, non-condensing
Sensor Temperature Rating (F) -58 F to +230 F
Sensor Temperature Rating (C) -50 C to +110 C
Dimensions (in.) 16 1/2 in wide x 8 in. high x 3 3/8 in deep
Dimensions (mm) 42 cm wide x 20.3 cm high x 8.5 cm deep
Weight (kg) 2.6 kg
Weight (lb) 5.7 lbs
Tradeline Value Tradeline
Type of Zoning Devices Controlled Zone valves with end switches
Boiler Design Temperature (F) 80F to 210F
Boiler Design Temperature (C) 26C to 99C
WWSD (Warm Weather Shut Down) Temperature (F) Off, 35 F to 100 F
WWSD (Warm Weather Shut Down) Temperature (C) Off, 1 C to 38 C
Electrical Connections (Line Voltage) Wire-clamp screw terminals, Maximum 2 x 14 AWG each on line voltage terminals
Outdoor Sensor Lead Length: 10 ft. (3050 mm). 10 kilohm NTC thermistor at 25 C (77 F) +/- 0.5F (+/-0.3C) up to 500 ft (150 M) using 18 AWG or larger wire, beta=3892.
Replacement Parts AQ10X38 24 Vac 38 VA transformer
Replacement Parts AQ12C10 outdoor sensor
Replacement Parts AQ12C11 supply/return/mixed loop sensor
Replacement Parts AQ1574V4 4-zone valve with end switch expansion module
Replacement Parts AQ1510B0 boiler reset module
Approvals, Canadian Standards Association Certified, File No. LR76030

Literature and other Resources Download Back To Top
Mounting Template - (AQ2514B2 Control Panel Mounting)
direct mail postcard - (AQ251 AQ251 Heating System Control)
bill stuffer - (AQ251 AQ251 Heating System Control)
direct mail postcard - (AQ251 AQ Outdoor Reset Panels)
Stuffer - (AQ251 AQ Outdoor Reset Panels)
Installation Job Record - (AQ2511B0 Outdoor Reset Zone Synchronizing Boiler Control)
Installation Job Record - (AQ2514B2 Boiler Reset Zone Synchronizing Control Panel)
Installation Job Record - (AQ2514B4 Boiler Reset Zone Synchronizing Control Panel)
Product Data - (AQ251 AQ251 Series Hydronic Control Panels)
User Operation and Maintenance - (AQ251 AQUATROL Zone Synchronizing Boiler Reset Controls)
Mounting Template - (AQ2511B0 Control Panel Mounting)
Sell Sheet - (AQ2511BO AQ2511BO Outdoor Reset Control Panel)
direct mail postcard - (AQ251 AQ251 Heating System Control (Homeowner))
CD ROM - (AQ2514B2 AQ2000 Product Selection Tool CD)
Boiler Reset Control Panel for Pumps or Valves Main(Photo_BW - Web Quality Image)
Boiler Reset Control Panel for Pumps or Valves Main(Photo_BW - Print Quality Image)
Boiler Reset Control Panel for Pumps or Valves Main(Photo_BW - Web Quality Image)
Boiler Reset Control Panel for Pumps or Valves Main(Photo_BW - Print Quality Image)
Boiler Reset Control Panel for Pumps or Valves Main(Photo_Color - Web Quality Image)
Boiler Reset Control Panel for Pumps or Valves Main(Photo_Color - Print Quality Image)
Boiler Reset Control Panel for Pumps or Valves Main(Photo_Color - Web Quality Image)
Boiler Reset Control Panel for Pumps or Valves Main(Photo_Color - Print Quality Image)
Aquatrol Boiler Reset Control Panel Main(Photo_BW - Web Quality Image)
Aquatrol Boiler Reset Control Panel Main(Photo_BW - Print Quality Image)
Aquatrol Boiler Reset Control Panel Main(Photo_BW - Web Quality Image)
Aquatrol Boiler Reset Control Panel Main(Photo_BW - Print Quality Image)
Aquatrol Boiler Reset Control Panel Main(Photo_Color - Web Quality Image)
Aquatrol Boiler Reset Control Panel Main(Photo_Color - Print Quality Image)
Aquatrol Boiler Reset Control Panel Main(Photo_BW - Web Quality Image)
Aquatrol Boiler Reset Control Panel Main(Photo_BW - Print Quality Image)
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