Honeywell AQ252 Catalog Page

AQUATROL Zoning System

AQ252 Universal Injection/Mixing Boiler Reset Control Panel for Hydronic Zoning System

The AQ252 family of AQUATROL Universal Injection/Mixing Boiler Reset Controls provides simplified, energy-efficient outdoor temperature compensated control of single-temperature, residential hydronic heating systems. The AQ252 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 with outdoor reset for increased energy efficiency with reduced boiler cycling. AQ252 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 communicating thermostats or most digital dry contact thermostats.

•Controls one boiler loop and one mixed temperature loop.

•Use of variable speed injection pump or motorized mixing valve for mixed temperature loop control.

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

Application: Controls one boiler and one mixing (either variable speed injection or floating valve mixing) loop in a hydronic zoning system.

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)

Power Supply: 120V/60Hz

User Interface (Setting, Programming): (LCD Display and a 7 button Key Pad)

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.

Setback Program: 7 day, up to 2 setback periods/day.

Boiler Design Temperature: 80F to 210F (26C to 99C)

Boiler (Supply) Min. Control Temperature: OFF, 59F to 180F (OFF, 15C to 82C)

Boiler (Supply) Max. Control Temperature: OFF, 120F to 225 F (OFF, 49C to 107 C)

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 5A, 1/3HP

DHW Demand Input: External dry contacts connection only

Outdoor Low Design Control Temperature: -60F to 32F (-51 C to 0 C) Return Minimum Control Temperature: 80 F to 180 F (27C to 82C) Variable Speed Injection Pump Output: Triac modulated; 120 Vac,

2.1A, 1/6HP

Pump/Valve exercise: 30 seconds per 2 weeks of space heating inactivity

Secondary Pump Output Rating: 120 Vac 5A, 1/3HP

•Displays of outdoor temperature on all AQ1000 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.

•Central programming of set points and setback.

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

•Zoning Control for up to four zones as shipped; can be expanded to a total of 16 zones with AQ255 or AQ257 expansion zoning panels, and up to 64 zones by using AQ254 Add-a-Temperature expansion panels.

•Outdoor temperature compensation (reset), or Load reset based on indoor temperature feedback.

•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.

•4 hours 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

Mixing Valve Floating Output (Com,O,C): 24Vac rated dry contacts Mixing Valve Modulating Output: 0-10 Vdc

WWSD (Warm Weather Shut Down) Temperature: Off, 35 F to 100 F (Off, 1 C to 38 C)

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: External dry contacts connection only

Secondary Loop Mixing (Supply) Design Temp Range: 70 F to 210 F (21 C to 99 C)

Secondary Loop Mixing (Supply) Max Control Temp Range:

80 F to 210 F (27 C to 99 C)

Secondary Loop Return Min Control Temp Range: 80 F to 180 F (27 C to 82 C)

Secondary Loop Mixing (Supply) Min Control Temp Range: 3 5 F to 150 F (2 C to 66 C)

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 (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: 6.0 lbs (2.7 kg)

Approvals

Canadian Standards Association: CSA C/US Certified to CSA and UL Standards, File No. LR76030

188

customer.honeywell.com

70-6910

AQUATROL Zoning System


		Type of Zoning	Number of Zones	Boiler Pump
	Product Number	Devices Controlled	Controlled	Output Rating	Replacement Parts

*	AQ25242B/U	Zone pumps or 2-wire	4	120 Vac/250 Vac 5A,	AQ15200B universal injection/mixing boiler reset module;
		valves (line voltage)		1/3HP	AQ12C11 supply/return/mixed loop sensor;
					AQ12C10 outdoor sensor; AQ10X38 24 Vac 38 VA transformer;
					AQ15540B 4-zone pump expansion module

*	AQ25244B/U	Zone valves with end	4	120 Vac/250 Vac 5A,	AQ15200B universal injection/mixing boiler reset module;
		switches		1/3HP	AQ15740B 4-zone valve with end switch expansion module;
					AQ12C11 supply/return/mixed loop sensor; AQ12C10 outdoor sensor;
					AQ10X38 24 Vac 38 VA transformer

* TRADELINE models • SUPER TRADELINE models

AQ254 Add-a-Temperature Injection/Mixing Expansion Control Panel for Hydronic Zoning System

expands the total network capacity by up to 16 zones when used with AQ255 and/or AQ257 zoning panels.

	• Acts as an add-on Control panel to the Main (AQ250, AQ25A,
	AQ251, AQ252) Control panel.
	• Allows each of the 16 zones connected to it to be assigned to the
	system's primary or secondary loop.
	• Up to 3 AQ254 panels can be added to a Main (AQ250, AQ25A,
	AQ251 or AQ252) Control panel.
	• Mixed loop temperature is controlled by a variable speed injection
	pump or motorized mixing valve connected to the AQ254.
	• Intuitive programming interface and armchair programming (can be
	programmed at your desk and taken to the job site “ready-to-install”)
The AQ254 Add-a-Temperature Expansion Control Panel is used in	• Customizable mixing control settings allow for greater level of control
	and comfort.
conjunction with an AQ250, AQ25A, AQ251 or AQ252 Control	• Zone synchronization through Zone of Greatest Demand control.
Panel. It provides one additional loop temperature control	• Integral 38 VA transformer with self resetting electronic fuse.
capability for the AQ2000 control panel it is connected to and

Application: Expanded zone control and mixed loop temperature control in a hydronic zoning system

Mixed loop target temperature is reset by either outdoor temperature or calculated system load based on indoor temperature feedback Mixing is target controlled by a variable speed injection pump or motorized mixing valve

Dimensions, Approximate: 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)

Power Supply: 120V/60Hz

User Interface (Setting, Programming): (LCD Display and a 3 button Key Pad)

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

Variable Speed Injection Pump Output: Triac modulated; 120 Vac, 2.1A, 1/6HP

Secondary Pump Output Rating: 120 Vac 5A, 1/3HP

Auxiliary Pump Output Rating: Dry contact output, 120 Vac/250 Vac 5A, 1/3 HP

Sensor Temperature Rating: -58 F to +230 F (-50 C to +110 C) Secondary Loop Mixing (Supply) Design Temp Range: 70 F to 210

F (21 C to 99 C)

Secondary Loop Mixing (Supply) Max Control Temp Range: 80 F to 210 F (27 C to 99 C)

Secondary Loop Return Min Control Temp Range: 80 F to 180 F (27 C to 82 C)

Secondary Loop Mixing (Supply) Min Control Temp Range: 35 F to 150 F (2 C to 66 C)

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 (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: 3.9 lbs (1.8 kg)

Approvals

Canadian Standards Association: CSA C/US Certified to CSA and UL Standards, File No. LR76030


	Product Number	Mixing Valve Floating Output (Com,O,C)	Replacement Parts

*	AQ25400B	24Vac rated dry contacts	AQ15400B Add-A-Temperature expansion control module;
			AQ12C11 supply/return/mixed loop sensor;
			AQ10X38 24 Vac 38 VA transformer

* TRADELINE models • SUPER TRADELINE models

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