Brochure

63-8702 37
AQ250 Electronic Relay Boiler Control Panel for Hydronic Zoning System
AQ250 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.
• 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
• Line or low-voltage output for zoning equipment, including pumps
or valves
• Features zone synchronization through the zone control
• Includes domestic hot water priority, priority override protection
and boiler short cycling protection
• Automated test feature for quick start-up and simplified
troublshooting
Application: Boiler control for zoned hydronic systems
Thermostat Compatibility: AQ1000 Series 2-wire communicating
thermostats and most digital thermostats
User Interface: DIP Switches
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
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) ±0.5°F (±0.3°C) 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) ± 0.5°F (±0.3°C) up to 500 ft (150M)
using 18 AWG or larger wire, beta=3892, Lead Length: 10 ft.
(3050mm)
Approvals, CSA: CSA C/US Certified to CSA and UL Standards, File No.
LR76030
Approximate, Dimensions: 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)
Weight: 4.9 lbs (2.3 kg)
Temperature Ratings: Panel – 32°F to 130°F; Sensor – -58°F to
+230°F (Panel – 0°C to 55°C; Sensor – -50°C to +110°C)
Supply Voltage: 120V 60 Hz
Material Number Zoning Devices Controlled Number of Zones Zone Output Contact Rating Replacement Parts
AQ25042B/U Zone pumps or 2-wire valves
(line voltage)
4 Pumps: 120 Vac/250 Vac,
5A, 1/3 HP, Valves: 24 Vac,
0.5 A, 12 VA
AQ10X38 24 Vac 38 VA transformer, AQ15540B 4-zone pump
expansion module, AQ12C11 supply/return/mixed loop sensor,
AQ15000B boiler control module
AQ25044B/U Zone valves with end switches 4 Pumps: 120 Vac/250 Vac,
5A, 1/3 HP, Valves: 24 Vac,
0.5 A, 12 VA
AQ10X38 24 Vac 38 VA transformer, AQ12C11 supply/return/mixed
loop sensor, AQ15000B boiler control module, AQ15740B 4-zone
valve with end switch expansion module
Hydronic Zoning System