AQUATROL Zoning System
AQ250 Electronic Relay Boiler Control Panel for Hydronic Zoning System
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.
•Controls up to 2 stages of heat from a single thermostat.
•Use with AQ1000 2-wire communicating thermostats, or most dry contact digital thermostats.
•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.
Application: Boiler control for zoned hydronic systems
Dimensions, Approximate: 13 in wide x 8 in. high x 3 3/8 in deep (33 cm wide x 20.3 cm high x 8.5 cm deep)
Power Supply: 120V/60Hz
User Interface (Setting, Programming): (DIP Switches)
Electrical Connections (Line Voltage): Wire-clamp screw terminals, Maximum 2 x 14 AWG each on line voltage terminals
Control and Zoning Panel Temperature Rating: 32 F to 130 F (0 C to 55 C)
Thermostat Compatibility: AQ1000 Series 2-wire communicating thermostats and most digital thermostats
Zone Module Thermostat input: Low voltage, Class II, 2-wire polarityinsensitive, digital communicating with power link to AQ1000 series thermostat.
Boiler Heat Post Purge: 30 seconds (sent to DHW tank or Zone of Greatest Demand - selectable)
Boiler (T-T) Output Rating: 24 Vac, 0.5A, 12VA
DHW Pump/Valve Output Rating: 120 Vac/250 Vac 5A, 1/3HP
DHW Demand Input: External dry contacts connection only Pump/Valve exercise: 30 seconds per 2 weeks of space heating
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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 Valves: 24 Vac, 0.5 A, 12 VA
ZR-ZC Contact Rating: 120 to 240 Vac, 1/3 HP
Sensor Temperature Rating: -58 F to +230 F (-50 C to +110 C)
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
Heat Demand (Thermostat R-W) Input: 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.
R-C Input (on Control and Zoning Modules): 24 Vac Class II R-C Output (on transformer): 38 VA, 24 Vac Class II
Operating Humidity Range (% RH): 5 to 90% RH, non-condensing
Weight: 4.9 lbs (2.3 kg)
Approvals
Canadian Standards Association: CSA C/US Certified to CSA and UL Standards, File No. LR76030
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Type of Zoning |
Number of Zones |
Boiler Pump |
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Product Number |
Devices Controlled |
Controlled |
Output Rating |
Replacement Parts |
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* |
AQ25042B/U |
Zone pumps or 2-wire |
4 |
120 Vac/250 |
AQ15000B boiler control module; AQ12C11 supply/return/mixed loop |
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valves (line voltage) |
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Vac 5A, 1/3HP |
sensor; AQ10X38 24 Vac 38 VA transformer; AQ15540B 4-zone |
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pump expansion module |
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* |
AQ25044B/U |
Zone valves with end |
4 |
120 Vac/250 |
AQ15000B boiler control module; AQ15740B 4-zone valve with end |
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switches |
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Vac 5A, 1/3HP |
switch expansion module; AQ12C11 supply/return/mixed loop |
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sensor; AQ10X38 24 Vac 38 VA transformer |
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* TRADELINE models • SUPER TRADELINE models |
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<![endif]>Hydronic
<![if ! IE]><![endif]>Controls
70-6910 |
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185 |
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