Product Info
Literature

Overview

AQ250 AQUATROL boiler controls for single temperature, residential hydronic heating systems ensure ample supply of hot water for space heating and domestic uses. Convert single zone heating systems or upgrade relay-logic zoning systems.

Features

Use with AQ1000 two-wire communicating thermostats, or most dry contact digital thermostats
Offers zoning control for up to four zones and controls up to two stages of heat from a single thermostat
Can expand up to 16 zones with AQ255 or AQ257 or up to 64 zones with AQ254 Add-A-Temp panels
Line or low-voltage output for zoning equipment, including pumps or valves
Features zone synchronization through the zone or Greatest Demand control
Includes domestic hot water priority, priority override protection and boiler short cycling protection
Automated test feature for quick start-up and simplified troublshooting

Product Specifications

Application: Boiler control for zoned hydronic systems
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 (lb): 4.9 lbs
Weight (kg): 2.3 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
User Interface: DIP Switches
Number of Zones: 4
Zoning Devices Controlled: Zone pumps or 2-wire valves (line voltage)
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
R-C Output (on transformer): 38 VA, 24 Vac Class II
R-C Input (on Control and Zoning Modules): 24 Vac Class II
Demand Input: Heat Demand (Thermostat R-W) 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.
ZR-ZC Contact Rating: 120 to 240 Vac, 1/3 HP
Output Ratings: Boiler (T-T)-- 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
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,AQ15000B boiler control module
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