Honeywell AQ252 Operation Manual

AQUATROL Zone Synchronizing Universal

Injection/Mixing Boiler Reset Controls

AQ252

USER OPERATION AND MAINTENANCE

APPLICATION

The AQ252 series of AQUATROL® Universal Injection/Mixing Boiler Reset Controls provides simplified, energy-efficient outdoor temperature compensated control of a hightemperature boiler loop and a lower temperature mixed loop in 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 and with reduced boiler cycling. The boiler controls of the AQ252 can ensure ample supply of hot water for both space heating and priority generation of domestic hot water for bathing, dishes and laundry.

When AQ1000 communicating thermostats are used with the AQ252 Zoning Modules, they can use the same wiring as existing thermostats. Night setback operation can be programmed from the AQ252 panel.

WARNING

Risk of electrical shock.

Can cause severe injury, property damage or death.

Only trained, experienced, licensed service technicians should service this Control Panel. The front cover of the AQ251 Control Panel should not be removed, as this will expose the user to potentially dangerous line voltage (120V) electricity.

Congratulations!

The AQUATROL AQ252 installed on your heating system is the most powerful, yet user-friendly hydronic heating control system available on the market for residential and light commercial installations.

This document contains all the information you need to program the comfort settings of the AQ252 and to customize its operation for your home or business. For detailed information on the operation of this control, please consult the trained hydronic heating professional that installed the AQ252 control.

	CONTENTS
Application ........................................................................	1
Familiarization with Control ..............................................	2
User Interface ..................................................................	2
LCD Display Panel Layout ................................................	3
Programming Instructions .................................................	4
Troubleshooting ................................................................	6
System Status and Error Codes .......................................	6
User Menu Structure .........................................................	8

This AQUATROL AQ252 control panel was installed by a trained hydronic heating contractor. To service this product, or for any questions relating to its installation, please contact:

Installing contractor: ___________________________________________________________________

Address: _____________________________________________________________________________

Phone: (________) __________________________________________________________

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AQUATROL ZONE SYNCHRONIZING UNIVERSAL INJECTION/MIXING BOILER RESET CONTROLS

Table 1. AQ252 Models

Model	Function	DHW	Zones	Zone Control
AQ25242B	Universal Injection/Mixing	Selectable DHW priority, with	2 – 16,	Line voltage circulators or 2-wire zone
	Boiler Reset Control Panel	optional priority override	in sets of 4	valves
	with integrated zoning
AQ25244B	Universal Injection/Mixing	Selectable DHW priority, with	2 – 16,	24 Vac zone valves with end switches
	Boiler Reset Control Panel	optional priority override	in sets of 4
	with integrated zoning

AQ252 Approvals and Standards:

Canadian Standards Association: Certified, File No. LR76030

Replacement Parts and Accessories:

AQ1000TN2: non-programmable zone thermostat AQ15200B: Replacement universal injection/mixing reset

boiler control module

AQ15740B: 4-zone valve expansion module AQ15540B: 4-zone pump expansion module AQ10X38: 24 Vac 38 VA transformer AQ12C10: Replacement sensor, outdoor

AQ12C11: Replacement sensor, supply and return on boiler loop and supply sensor on secondary loop

AQ12C20: Floor / slab sensor

FAMILIARIZATION WITH CONTROL

User Interface

The AQ252 User Interface consists of an LCD screen (16 characters by 3 rows) and a 7-button keypad for navigating the menus, as illustrated in Fig. 1.

Keypad

The 7- button keypad provides the following functions.

Menu Press this button to access the User Menu. When pressed while in a sub-menu, the sub-menu’s values are saved before going up one level in the current menu.

Home Press this button to leave the User or Installer Menu and return to the Home Page display screen.

OK Press this button to enter a sub-menu of the active menu item. A menu item is active when the indicator arrow (←) is positioned beside the item.

^ and v Press these buttons to scroll up/down in the menu

items. Pressing one of these buttons automatically exits the edit mode, and the selection moves to the previous or next menu item.

– and + Press these buttons to decrease/increase the value of a selected menu item, or to scroll through a list of pre-defined options.

- If the menu item being modified is a number, the displayed value will decrease/increase by pressing these buttons. When holding the – or + button for more than a second, the values automatically decrease/increase at a faster pace, similar to setting the time on a digital clock radio.

- If the menu item is an option, pressing these buttons scrolls through the list of available options one at a time.

STATUS OF SYSTEM DEMANDS

STATUS OF SYSTEM OUTPUTS

DISPLAY AREA SHOWING

- CALL FOR HEAT

- AUXILIARY OUTPUT ACTIVE

SYSTEM STATUS AND MENU

- CALL FOR DHW

- BOILER T-T OUTPUT ACTIVE

OPTIONS AND SELECTIONS

- SIGNAL ON AUXILIARY INPUT

MADE

GRAPHIC SHOWING

THE PERCENTAGE

OF THE BOILER’S

HEATING CAPACITY

AT WHICH IT’S

OPERATING; ARROWS

ABOVE AND BELOW

THE BAR SHOW THE

TREND OF THE

BOILER’S

TEMPERATURE

(UP OR DOWN)

STATUS OF LINE VOLTAGE OUTPUTS

GRAPHIC SHOWING THE DEGREE OF

DOWN ARROW, IF DISPLAYED,

INDICATES THAT OTHER MENU ITEMS

- PRIMARY (BOILER) HEAT

MIXING IN THE SECONDARY LOOP:

EXIST BELOW AND CAN BE VIEWED

- DHW PUMP

# OF BARS INCREASES AS A) THE

BY SCROLLING DOWN WITH

- SECONDARY PUMP

INJECTION PUMP SPEED INCREASES,

THE

BUTTON.

- AUXILIARY “PUMP” OUTPUT

B) THE VOLTAGE OF THE MODULATING

VALVE SIGNAL INCREASES OR C) THE

ACTUAL MIX TEMPERATURE APPROACHES

THE MAXIMUM MIX TEMPERATURE

UP ARROW, IF DISPLAYED, INDICATES THAT OTHER MENU ITEMS EXIST ABOVE AND CAN BE VIEWED BY SCROLLING UP WITH THE BUTTON.

?? ARROW INDICATES

THE CURRENTLY SELECTED “ACTIVE” MENU ITEM.

M27698

Fig. 1. LCD display and keypad layout.

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AQUATROL ZONE SYNCHRONIZING UNIVERSAL INJECTION/MIXING BOILER RESET CONTROLS

LCD Display Panel Layout

The LCD on the AQ252 Control Panel is used to:

—Monitor system status and performance.

—Select and/or modify control settings for the hydronic system.

—Diagnose and troubleshoot system problems.

The layout of the display is logical and simple to navigate. The information displays so that you can see at a glance the system’s operating temperatures, as well as the status of the system equipment, such as a call for heat, DHW pump ON, Boiler T-T terminals energized, etc. Fig. 1 on page 2 illustrates the layout and features of the LCD display panel and keypad.

•If the active menu item leads to a further sub-menu, pressing the OK button displays the sub-menu options on

the LCD. Scroll through this sub-menu to position the indicator arrow (←) beside the desired menu item to input or modify. Choose one of the options provided or input the desired value for the menu item. When satisfied, scroll to another item and your selection will be saved.

•To define or modify another item within the same menu,

scroll the up and down buttons (^ or v) until the indicator arrow (←) is beside the desired option. Use the – or + buttons to set the value for that item.

•To move back (up) one level within a menu, press the Menu button.

LCD Display Navigation

This section describes how the keypad is used to navigate the LCD display and menus.

•The LCD displays up to three lines of text at a time. For menus with more than three lines, use the up and down buttons (^ or v) to scroll through the menu options.

•As the menu is scrolled up or down, the indicator arrow (←) shows which menu item is active.

•If the active menu item is part of a list of predefined options (e.g., Day of the Week) press the – or + button to scroll through the available options until the preferred option is displayed. The option is automatically saved when the indicator arrow is scrolled away from the value being edited.

•If the active menu item requires you to define a value (e.g., a setpoint), use the – or + button to decrease or increase the value until the desired value is displayed. The selection will be saved when the indicator arrow is scrolled up or down.

NOTES:

1.When setting times for the setback schedule, you must use the – or + button to change the time.

2.The OK button, when pressed, defaults the time setting to “--:--” (midnight).

•To return to the Home Page display, press the Home button.

NOTE: The AQ252 automatically returns to the Home Page display after 60 minutes of inactivity on the keypad.

HOME PAGE DISPLAY

The Home Page is the default view displayed on the AQ252 Control Panel's LCD screen.

There are two Home Page views - Simple and Detail.

•Simple view shows 3 lines of text and is a brief description of the system operation.

•Detail view includes the same 3 lines plus 10 lines of additional information. Detail view is the factory default.

The choice of the Simple or Detail Home Page view is made from the USER MENU > PREFERENCES/TIME menu option.

The Home Page display information for the Simple and Detail views is illustrated in Fig. 2.

	LCD DISPLAY			KEYPAD
HOME PAGE (SIMPLE)
	WEDNESDAY	9:30A
	PROGRAM:	LEAVE
	OUTDOOR:	-5		Menu
HOME PAGE (DETAIL)	WEDNESDAY	9:30A
			RETRN SLEEP WAKE OCC UNOCC
	PROGRAM:	LEAVE
	OUTDOOR:	-5		Home
	TARGET:	180		WWSD - -
	BOILER:	180
	RETURN:	160
	SECONDARY:	100	WWSD - -
	SEC TARGET:	100
	DHW:	100
	ZONE COUNT:	31		M27699

Fig. 2. Home Page displays (Simple and Detail).

3	69-1990—02