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
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