Honeywell AQ252 Operation Manual
AQUATROL Zone Synchronizing Universal
Injection/Mixing Boiler Reset Controls
AQ252
USER OPERATION AND MAINTENANCE
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.
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.
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: _____________________________________________________________________________
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.
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
CONTENTS
Phone: (________) __________________________________________________________
69-1990-02
AQUATROL ZONE SYNCHRONIZING UNIVERSAL INJECTION/MIXING BOILER RESET CONTROLS
A
A
Table 1. AQ252 Models
Model Function DHW Zones Zone Control
AQ25242B Universal Injection/Mixing
Boiler Reset Control Panel
Selectable DHW priority, with
optional priority override
2 – 16,
in sets of 4
Line voltage circulators or 2-wire zone
valves
with integrated zoning
AQ25244B Universal Injection/Mixing
Boiler Reset Control Panel
Selectable DHW priority, with
optional priority override
2 – 16,
in sets of 4
24 Vac zone valves with end switches
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
and v Press these buttons to scroll up/down in the menu
^
– and + Press these buttons to decrease/increase the value
menu item. A menu item is active when the
indicator arrow (←) is positioned beside the item.
items. Pressing one of these buttons automatically
exits the edit mode, and the selection moves to the
previous or next menu item.
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
- CALL FOR HEAT
- CALL FOR DHW
- SIGNAL ON AUXILIARY INPUT
GRAPHIC SHOWING
THE PERCENTAGE
OF THE BOILER’S
HEATING CAPACITY
T WHICH IT’S
OPERATING; ARROWS
BOVE AND BELOW
THE BAR SHOW THE
TREND OF THE
BOILER’S
TEMPERATURE
(UP OR DOWN)
STATUS OF LINE VOLTAGE OUTPUTS
- PRIMARY (BOILER) HEAT
- DHW PUMP
- SECONDARY PUMP
- AUXILIARY “PUMP” OUTPUT
69-1990—02 2
STATUS OF SYSTEM OUTPUTS
- AUXILIARY OUTPUT ACTIVE
- BOILER T-T OUTPUT ACTIVE
GRAPHIC SHOWING THE DEGREE OF
MIXING IN THE SECONDARY LOOP:
# OF BARS INCREASES AS A) THE
INJECTION PUMP SPEED INCREASES,
B) THE VOLTAGE OF THE MODULATING
VALVE SIGNAL INCREASES OR C) THE
ACTUAL MIX TEMPERATURE APPROACHES
THE MAXIMUM MIX TEMPERATURE
Fig. 1. LCD display and keypad layout.
DISPLAY AREA SHOWING
SYSTEM STATUS AND MENU
OPTIONS AND SELECTIONS
MADE
DOWN ARROW, IF DISPLAYED,
INDICATES THAT OTHER MENU ITEMS
EXIST BELOW AND CAN BE VIEWED
BY SCROLLING DOWN WITH
THE BUTTON.
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
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.
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 (
• 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
2. The OK button, when pressed, defaults the time
or v) to scroll through the menu options.
^
must
use the – or + button to change the time.
setting to “--:--” (midnight).
• 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 (
arrow (←) is beside the desired option. Use the – or +
or v) until the indicator
^
buttons to set the value for that item.
• To move back (up) one level within a menu, press the
Menu button.
• 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.
HOME PAGE (SIMPLE)
HOME PAGE (DETAIL)
LCD DISPLAY
WEDNESDAY 9:30A
PROGRAM: LEAVE
OUTDOOR: -5
WEDNESDAY 9:30A
PROGRAM: LEAVE RETRN SLEEP WAKE OCC UNOCC
OUTDOOR: -5
TARGET: 180 WWSD BOILER: 180
RETURN: 160
SECONDARY: 100
SEC TARGET: 100 WWSD DHW: 100
ZONE COUNT: 31
-
-
Fig. 2. Home Page displays (Simple and Detail).
3 69-1990—02
KEYPAD
Menu
Home
M27699
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