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Environmental & Combustion Controls
AQ2504B2
Aquatrol Boiler Control Panel

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Overview
The AQ250 family of AQUATROL Boiler Controls provides simplified, energy-efficient control of single temperature, residential hydronic heating systems. The AQ250 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 for increased energy efficiency with reduced boiler cycling. AQ250 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

• 1-stage zoning.
• Zoning Control for up to 4 zones as shipped; can be expanded to a total of 16 zones with AQ255 or AQ257 expansion zoning panels and up to 64 zones when used with AQ254 Add-A-Temp panels.
• Line or low-voltage output for zoning equipment (pumps or valves).
• Zone synchronization through Zone or Greatest Demand control.
• Domestic hot water priority and priority override protection.
• Boiler short cycling protection.
• Boiler post purge.
• Freeze protection.
• Pump/valve exercise.
• Boiler shock prevention from cold water returning to boiler.
• Automated test feature for quick start-up and simplified troubleshooting.
• Integral 38 VA transformer with self-resetting electronic fuse.
• CSA C/US Certified to CSA and UL Standards, File No. LR76030
Product Specifications  Back To Top
Application Boiler control for zoned hydronic systems
Thermostat Compatibility AQ1000 Series 2-wire communicating thermostats
User Interface (Setting, Programming) DIP Switches
Number of Communicating Zones Controlled 4
Boiler Heat Post Purge 30 seconds (sent to DHW tank or Zone of Greatest Demand - selectable)
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
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.
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
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.
ZR-ZC Contact Rating 120 to 240 Vac, 1/3 HP
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.) 13 in wide x 8 in. high x 3 3/8 in deep
Dimensions (mm) 33 cm wide x 20.3 cm high x 8.5 cm deep
Weight (kg) 2.3 kg
Weight (lb) 4.9 lbs
Tradeline Value Tradeline
Type of Zoning Devices Controlled Zone pumps or 2-wire valves (line voltage)
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 AQ1500B0 boiler control module
Replacement Parts AQ1554P2 4-zone pump expansion module
Replacement Parts AQ10X38 24 Vac 38 VA transformer
Replacement Parts AQ12C11 supply/return/mixed loop sensor
Approvals, Canadian Standards Association Certified, File No. LR76030

Literature and other Resources Download Back To Top
Installation Job Record - (AQ2504B2 RelayPLUS Zone Synchronizing Boiler Control)
Installation Job Record - (AQ2504B4 RelayPLUS Zone Synchronizing Boiler Control)
Quick Installation Guide - (AQ250 Hydronic Control Panels)
Competitive Comparison - (AQ250 & AQ25A AQ250 and AQ25A Control Panel Feature Comparison)
Mounting Template - (AQ2504B4 Control Panel Mounting)
CD ROM - (AQ2504B4 AQ2000 Product Selection Tool CD)
Boiler Control Panel for Pumps or Valves Main(Photo_BW - Web Quality Image)
Boiler Control Panel for Pumps or Valves Main(Photo_BW - Print Quality Image)
Boiler Control Panel for Pumps or Valves Main(Photo_BW - Web Quality Image)
Boiler Control Panel for Pumps or Valves Main(Photo_BW - Print Quality Image)
Boiler Control Panel for Pumps or Valves Main(Photo_Color - Web Quality Image)
Boiler Control Panel for Pumps or Valves Main(Photo_Color - Print Quality Image)
Boiler Control Panel for Pumps or Valves Main(Photo_Color - Web Quality Image)
Boiler Control Panel for Pumps or Valves Main(Photo_Color - Print Quality Image)
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