Honeywell AQ25A Catalog Page

AQUATROL Zoning System

AQ25A Programmable Relay Control Panel for Hydronic Zoning
System

• Displays outdoor temperature on all AQ1000 Series thermostats
when used with an AQ12C10 outdoor sensor (included).

• Intuitive programming interface and armchair programming (can be
programmed at your desk and taken to the job site “ready-to-install”).

• Customizable control settings and schedules allow for greater level
of control and comfort.

• Controls up to 2 stages of heat from a single thermostat.

• Central programming of zone set points and setbacks

• 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-Temperature
panels.

The AQ25A family of AQUATROL Programmable Relay Boiler
Controls provides simplified, energy-efficient control of single­temperature, residential hydronic heating systems. The AQ25A
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. AQ25A
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.

• Use with AQ1000 2-wire dry contact communicating thermostats and
most digital thermostats.

• 0-10 Vdc modulating output for driving a modulating/condensing
boiler.

Application: Boiler control for zoned hydronic systems
Dimensions, Approximate: 16 1/2 in wide x 8 in. high x 3 3/8 in deep

(42 cm wide x 20.3 cm high x 8.5 cm deep)

Powe r Su pply: 120V/60Hz
User Interface (Setting, Programming): (LCD Display and a 7 button

Key Pad) (DIP Switches on zoning modules)

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 polarity-

insensitive, digital communicating with power link to AQ1000 series
thermostat.

Setback Program: 7 day, up to 2 setback periods/day.
Boiler Heat Post Purge: Off, 10 seconds to 30 minutes (factory default

is 30 seconds)

Boiler (T-T) Output Rating: 24 Vac, 0.5A, 12VA
Boiler Differential: 2F to 41F (1C to 23C), or Auto (minimum 2 minutes

on time)

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

inactivity

• Zone synchronization through Zone of Greatest Demand control.

• Domestic hot water priority and priority override protection.

• Line or low-voltage output for zoning equipment (pumps or valves).

• Boiler short cycling protection.

• Boiler post purge.

• Freeze protection.

• Pump/valve exercise.

• Boiler shock prevention from cold water returning to boiler.

• Automated test and purge feature for quick start-up and simplified
troubleshooting.

• Integral 38 VA transformer with self resetting electronic fuse.

• 2 hour power supply (super-capacitor) to retain day and time settings
during power outage.

• Non-volatile EPROM memory retains program settings during power
outage.

Auxiliary Pump Output Rating: Dry contact output, 120 Vac/250 Vac

5A, 1/3 HP

Auxiliary Low Voltage Output Rating: 24 Vac, 0.5A, 12VA
Auxiliary (Demand) Input: External dry contacts connection only
Zone Output Contact Rating: Pumps: 120 Vac/250 Vac, 5A, 1/3 HP

Valves: 24 Vac, 0.5 A, 12 VA

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:

connection only

B Communication Bus Terminals: Low voltage, Class II, 2-wire

B-

polarity-insensitive, digital communicating link to other Control or
Zoning modules.

R-C Input (on Control and Zoning Modules): 24 Vac Class II (input

on Control and Zoning Modules)

R-C Output (on transformer): 38 VA, 24 Vac Class II
Operating Humidity Range (% RH): 5 to 90% RH, non-condensing
Weight: 5.7 lbs (2.6 kg)
Approvals
Canadian Standards Association: CSA C/US Certified to CSA and

UL Standards, File No. LR76030

External dry contacts

Type of
Zoning

Product Number

* AQ25A42B/U Zone pumps or

* AQ25A44B/U Zone valves with

* TRADELINE models • SUPER TRADELINE models

186 customer.honeywell.com 70-6910

Devices
Controlled

2-wire valves
(line voltage)

end switches

Number of
Zones
Controlled

4 120 Vac/250

4 120 Vac/250

Boiler Pump
Output
Rating

Vac 5A, 1/3HP

Vac 5A, 1/3HP

Weight

5.7 lbs 2.6 kg AQ15A00B boiler control module; AQ12C11 supply/return/mixed

5.7 lbs 2.6 kg AQ15A00B boiler control module; AQ15740B 4-zone valve with

Replacement Partslb kg

loop sensor; AQ12C10 outdoor sensor; AQ10X38 24 Vac 38 VA
transformer; AQ15540B 4-zone pump expansion module

end switch expansion module; AQ12C11 supply/return/mixed
loop sensor; AQ12C10 outdoor sensor; AQ10X38 24 Vac 38 VA
transformer