HONEYWELL AQ2504B2 Aquatrol Boiler Control Panel for 4 Zone Pumps or Valves. The AQ2504B family of Aquatrol Boiler Controls provides simplified, energy-efficient control of single-temperature, residential hydronic heating systems. It works with the AQ1000T communicating thermostats to convert 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 and reduced boiler cycling.

Features:

• Factory configured for control of up to four zones plus domestic hot water.

• Expandable up to 16 zones with expansion zoning modules (sold separately).

• Single stage boiler control synchronized to zone-of-greatest-demand.

• Reduced boiler short-cycling.

• Integral Domestic Hot Water control.

• Installer selectable DHW Priority.

• Installer selectable DHW Priority Override.

• Replacement Parts: AQ1554P2 4-zone pump expansion module. AQ10X38 24 Vac 38 VA transformer, AQ12C10 outdoor sensor, AQ12C11 supply/return sensor.

Product Specifications:

• Application: Boiler control for hydronic zoning system

• Thermostat Compatibility: AQ1000T Series 2-wire Communication Thermostats

• User Interface (Setting, Programming): DIP Switches

• Number of Communicating Zones Controlled: 4

• 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.

• Heat Demand (Thermostat R-W) Input: External dry contacts connection only

• DHW Demand Input: External dry contacts connection only

• Boiler (T-T) Output Rating: 24Vac, 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 (C1-C2) 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: 120 Vac/250 Vac, 5A, 1/3 HP

• 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: Pump or 2-wire valve (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: AQ12C10 outdoor sensor

• Replacement Parts: AQ12C11 supply/return sensor

• Approvals, Canadian Standards Association: Certified

• Approvals, Underwriters Laboratories Inc: File No. LR76030