Product Info
Literature

Overview

AQ251 AQUATROL boiler reset controls for single temperature, residential hydronic heating systems, provide energy-efficient outdoor-temperature compensated control to convert single zone heating sysem or upgrade relay-logic zoning systems.

Features

0 to 10 Vdc modulating output for driving a modulating/condensing boiler
Displays outdoor temperature on all AQ1000 thermostats when used with the included AQ12C10 outdoor sensor
Customizable control settings allow for greater control and comfort
Intuitive and accessible programming interface and central program of zone set points and setback
Zoning control for up to four zones and can be up to 64 zones using expansion panels
Boiler short cycling protection, boiler post purge and boiler shock prevent from cold water returning to boiler
Domestic hot water priority and priority override protection, as well as an automated test and purge feature
Test and purge feature for quick start-up and simplified troubleshooting

Product Specifications

Application: Boiler reset control for hydronic zoning system
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 (lb): 5.7 lbs
Weight (kg): 2.6 kg
Approvals, Canadian Standards Association: CSA C/US Certified to CSA and UL Standards, File No. LR76030
Tradeline Value: Tradeline
Thermostat Compatibility: AQ1000 Series 2-wire communicating thermostats and most digital thermostats
Setback Program: 7 day, up to 2 setback periods/day.
User Interface: LCD Display and a 7 button Key Pad
Number of Zones: 4
Zoning Devices Controlled: Pumps or 2-wire valves
Boiler Control Temperature (F): Supply--Max: OFF, 120F to 225 F; Min: OFF, 59F to 180F; Differential--2 F to 41 F or Auto (minimum 2 minutes on time)
Boiler Control Temperature (C): Supply--Max: OFF, 49C to 107 C; Min: OFF, 15C to 82C; Differential--1 C to 23 C or Auto (minimum 2 minutes on time)
Boiler Design Temperature (F): 80F to 210F
Boiler Design Temperature (C): 26C to 99C
Outdoor Low Design Control Temperature (F): -60F to 32F
Outdoor Low Design Control Temperature (C): -51 C to 0 C
Return Min. Control Temperature (F): 80 F to 180 F
Return Min. Control Temperature (C): 27C to 82C
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
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)
Demand Input: Heat Demand (Thermostat R-W), Auxiliary Demand, and DHW Demand--External dry contacts connection only
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.
Output Ratings: Boiler (T-T)-- 24 Vac, 0.5A, 12VA; Auxiliary Low Voltage-- 24 Vac, 0.5A, 12VA; Boiler Pump-- 120 Vac/250 Vac 5A, 1/3HP; DHW Pump/Valve-- 120 Vac/250 Vac 5A, 1/3HP; Auxiliary Pump-- Dry contact output, 120 Vac/250 Vac 5A, 1/3 HP
Zone Output Contact Rating: Pumps: 120 Vac/250 Vac, 5A, 1/3 HP,Valves: 24 Vac, 0.5 A, 12 VA
Electrical Connections: Wire-clamp screw terminals, Maximum 2 x 14 AWG each on line voltage terminals
Operating Humidity Range (% RH): 5 to 90% RH, non-condensing
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
Sensor: Supply/Return Sensor--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, Lead Length: 10 ft. (3050 mm); Outdoor Sensor--10 kilohm NTC thermistor at 25 C (77 F) ± 0.5F (±0.3C) up to 500 ft (150 M) using
Replacement Parts: AQ10X38 24 Vac 38 VA transformer,AQ15540B 4-zone pump expansion module,AQ12C11 supply/return/mixed loop sensor,AQ15100B boiler reset module,AQ12C10 outdoor sensor
Temperature Ratings (C): Panel--0 C to 55 C; Sensor-- -50 C to +110 C
Temperature Ratings (F): Panel--32 F to 130 F; Sensor-- -58 F to +230 F
Supply Voltage: 120V 60 Hz