Brochure

38 63-8702
AQ255 and AQ257 Zoning Expansion Panel for Hydronic Zoning System
AQ255 expansion zoning panels work with AQ2000 boiler control
panels and AQ1000 communicating thermostats to control up to four
space heating zones, up to 16 zones with additional panels.
• Features AQ255 for zoning with pumps or zone valves without end
switches
• Auto test function tests zones at system start up and allows for
operator controlled testing of zones
• LED lights offer visual diagnostics of zone operation
• Adjacent zoning panels can operate different zone equipment
• Easily switch from zone valves to pumps with same zoning module
• R-C transformer and B-B data bus terminal connections (network
communication) for easy expansion
• Zones can energize a group pump via Aux Out dry contacts
• Zone synchronization through zone control
Application: Zoning control for hydronic zoning system
Thermostat Compatibility: AQ1000 Series 2-wire communicating
thermostats and most digital thermostats
User Interface: DIP Switches
R-C Input (on Control and Zoning Modules): 24 Vac Class II (input on
Control and Zoning Modules)
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.
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
Approvals, CSA: CSA C/US Certified to CSA and UL Standards, File No.
LR76030
Approximate, Dimensions: 9 1/2 in. wide x 8 in. high x 3 3/8 in. deep
(24 cm wide x 20.3 cm high x 8.5 cm deep)
Temperature Ratings: Panel – 32°F to 130°F (Panel – 0°C to 55°C)
Material Number Zoning Devices Controlled Number of Zones Zone Output Contact Rating Weight Replacement Parts
AQ25542B/U Zone pumps or 2-wire valves
(line voltage)
4 120 Vac/250 Vac, 5A, 1/3 HP 2.1 lbs (1 kg) AQ15540B 4-zone pump expansion module
AQ25742B/U 2-wire valve (24 Vac) 4 120 Vac/250 Vac, 0.5A, 12VA 3.9 lbs (1.8 kg) AQ10X38 24 Vac 38 VA transformer,
AQ15540B 4-zone pump expansion module
AQ25744B/U Zone valves with end switches
(24 Vac)
4 120 Vac/250 Vac, 0.5A, 12VA 3.9 lbs (1.8 kg) AQ10X38 24 Vac 38 VA transformer,
AQ15740B 4-zone valve with end switch
expansion module
Hydronic Zoning System