The AQ250 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. The boiler control of the AQ250 can ensure
ample supply of hot water for both space heating and priority
generation of domestic hot water for bathing, dishes and
laundry.
FEATURES
The AQ250 Series Hydronic Control Panels have the following
features:
• Zoning Control for up to four, single-stage zones or
two, two-stage 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 us ing up to thre e
AQ254 Add-a-Temperature expansion panels and
additional expansion zoning modules.
• Controls one boiler loop.
• Zone synchronization through Zone of Greatest
Demand control.
• Domestic hot water (DHW) priority and priority
override protection.
• Use with digital non-communicating thermostats or
AQ1000 2-wire polarity insensitive communicating
thermostats.
• Automated test feature for quick start-up and
simplified troubleshooting.
• Boiler freeze protection (in the event of network
communication failure).
• Boiler short cycling protection, post purge, and shock
prevention from cold water returning to boiler.
• Line or low-voltage output for zoning equipment
(pumps or valves).
• Integral 38 VA transformer with self resetting
electronic fuse.
IMPORTANT
T o ensure correct installation and proper operation of
the control, perform the 7 installation steps in the
order numbered in the “Contents” below.
R–C Output (on transformer): 38 VA, 24 Vac Class II
Interface and Timings:
User Interface: DIP Switch settings
Boiler Heat Post Purge: 30 seconds; not adjustable
Pump/Valve exercise: 30 seconds per 2 weeks of space
heating inactivity; not adjustable
Thermostat Compatibility: Digital thermostats and/or
AQ1000 Series 2-wire communicating thermostats
Supply/Return Loop Sensor: 10K ohm NTC thermistor at
77°F (25°C) ± 0.5°F (±0.3°C). Lead length: 10 ft. (3.0 m);
up to 500 ft. (150 m) using 18 AWG or larger wire,
beta=3892.
Dimensions (HxWxD): 8.0 x 13 x 3.3 in. (20.3 x 32.9 x
8.5 cm) approximate
Weight: 4.9 lb. (2.2 kg)
Approvals: Canadian Standards Association: Certified, File
No. LR76030
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:
1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).
2. Honeywell Customer Care
1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
68-0306—052
AQ250 SERIES HYDRONIC CONTROL PANELS
WARNING
1INSTALLATION PREPARATION
NOTES: Through out these instructions, the following
terminology conventions are used:
— AQ150 refers to the AQ15000B Control Module;
— AQ155 refers to the AQ15540B Zoning Module.
— AQ157 refers to the AQ15740B Zoning Module.
— AQ250 is used when the information applies to both
the AQ25042B and AQ25044B Control Panels. Where
there are specific instructions or details relating to the “42B” or “-44B” Control Panels, the full model number
(i.e. AQ25044B) is used;
— AQ255 refers to all of the AQ25542B, AQ25582B and
AQ25742B Expansion Zoning Panels
— AQ257 refers to the AQ25744B Expansion Zoning
Panel. Where there are specific instructions or details
relating to the “-42B”, “-82B”, “-42B”, or “-44B”
Expansion Zoning Panels, the full model number (i.e.
AQ25744B) is used;
— Control Module refers to the component within an
AQ2000 Series Control Panel that performs the master
control operations. See Table 1 on page 2 for specific
models.
— Control Panel refers to an assembled product,
consisting of a transformer, Control Module and Zoning
Module, all contained within an AQ2000 panel
enclosure;
— Expansion Zoning Panel refers to an assembled
product, consisting of a Zoning Module and, if
applicable, a transformer, contained within an AQ2000
panel enclosure. Zoning Modules are available in either
4-zone or 8-zone configurations. Refer to Honeywell
literature Form No. 69-1981 for more information on
these products.
— Zoning Module refers to the component within an
AQ2000 Series Control Panel or Zoning Expansion
Panel.
When Installing this Product…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
the application.
3. Installers must be trained, experienced, and licensed
service technicians.
4. Follow local codes for installation and application.
5. After installation is complete, check out the product
operation as printed in these instructions.
Risk of electrical shock.
Can cause severe injury, property damage or death.
Disconnect power supply before installation and before
servicing.
Check That You Have All the Necessary
Equipment For a Successful Installation
• AQ2000 Series components:
— AQ250 Control Panel
— AQ Expansion Zoning Panels (if more than four space
heating zones in the system)
— Digital thermostats (one for every space heating zone
being controlled)
• Boiler supply and return temperature sensors (included with
the AQ250 Control Panel)
• Low voltage thermostat wire
• Zoning equipment (zone valves or pumps)
Read All Instructions Carefully Before
Proceeding
The AQ250 Control Panels are a part of a totally new series of
hydronic controls. And although they - and other AQ2000
system components - are very easy to install and operate, they
are different than other hydronic controls that you have
previously installed. So take a moment to read through this
quick installation guide before
Failure to follow them could damage the product or cause a
hazardous condition.
beginning the installation.
Familiarize Yourself With the AQ250 Control
Panel Layout
Refer to Fig. 1 on page 4. All AQ250 Control Panels consist of
three functional components:
1. AQ10X38 transformer (power supply module), which
connects to 120 V ac power and supplies 24 V ac power to
the Control Module and Zoning Modules
2. AQ15000B boiler / DHW Control Module, which controls
the boiler and domestic hot water (DHW) functions as
well as coordinating the overall operation of the hydronic
system.
3. One of two different 4-zone Zoning Modules:
• AQ15740B (part of the AQ25044B Control Panel)
for zoning with 24 Vac zone valves with
switches.
• AQ15540B (part of the AQ25042B Control Panel)
for zoning with either line voltage circulators or 24
Vac zone valves without
AQ250 Control Panels can control a maximum of 16 zones by
connecting additional Expansion Zoning Panels to the AQ250
Control Panel. Each Expansion Zoning Panel is configured
with its own bank of DIP switches, located in the left-most
section of each Zoning Module. To expand the capacity of an
AQ250 Control Panel beyond 16 zones, an AQ254 Add-ATemperature Expansion Control Panel is required. The
hydronic system can be expanded by 16 zones for each
AQ254 connected to the AQ2000 network. A maximum of
three (3) AQ254 Panels may be connected to an existing
AQ2000 Control Panel for a maximum of 64 zones connected
on the AQUATROL® network
NOTE: If an AQ254 Add-A-Temperature Expansion Control
Panel is used for controlling the temperature in a
mixed loop, it can reset the mixed loop temperature
using LOAD reset, but not OUTDOOR reset, as the
AQ250 panel does not have input terminals for an
outdoor sensor.
end switches.
end
368-0306—05
AQ250 SERIES HYDRONIC CONTROL PANELS
A
In general, the top terminals of the AQ2000 Series components
carry low voltage (24 Vac) power and the bottom terminals
carry line voltage (120 Vac) power. This is illustrated in Fig. 1.
The two exceptions to this are:
1. AQ15740B Zoning Module for use with zone valves with
end switches.
2. AQ15540B Zoning Module when used with low voltage
zone valves without
LINE VOLTAGE
(120 V)
end switches.
TRANSFORMER
CONTROL MODULE
ZR
For these the two exceptions, the bottom terminals of the
Transformer and Control Module carry line voltage (120 Vac),
but the bottom terminals of the Zoning Module will carry low
voltage (24 Vac) power.
The powered terminals on the bottom of the AQ2000 Series
Control Modules and Zoning Modules are connected internally,
as shown in Fig. 2. The voltage supplied to the N and L
terminals is also available at the adjacent terminal pairs when
the hot ( ) relays are switched.
ZONING MODULE
Boiler
DHW
Aux
Zone 1
Zone 2
Zone 3
Zone 4
M29032A
LOW VOLTAGE
(24 V)
LOW VOLTAGE
(24 V)
Fig. 1. AQ250 Control Panel layout (AQ25044B shown).
CONTACTS
SYMBOL
Fig. 2. Internal wiring for AQ2000 Series components line voltage relays.
2MOUNTING
This section describes how to mount the Control Panel,
Expansion Zoning Panels, and the Thermostats.
Mount AQ250 Control Panel
Mount the control panel on the wall:
1. Use the template supplied with the AQ250 Series
Control Panel to mark the four mounting holes for the
panel.
2. Install two top screws, mount the panel, and install the
two lower screws.
ZR
Boiler
DHW
Aux
Zone 1
Zone 2
Zone 3
Zone 4
M29033
Mount Expansion Zoning Panels
If there are Expansion Zoning Panels to install, mount them to
the wall now:
1. Remove wire channel plugs from the AQ250 Control
Panel and any Expansion Zoning Panels (see Fig. 3 on
page 5).
2. Mount Expansion Zoning Panel on the right-hand end of
the AQ250 Control Panel. Install two top screws of the
Expansion Zoning Panel, ensuring it is level with the
adjoining Control Panel, and install two lower screws.
3. Reverse wire channel plugs and re-insert them into their
slot, to form a wiring channel between the Control Panel
and the Expansion Zoning Panel (see Fig. 3 on page 5)
and to connect the two panels together.
68-0306—054
4. For any additional Expansion Zoning Panels, repeat
M23733A
WIRE
CHANNEL
PLUGS
WIRE
CHANNEL
PLUGS
steps 1–3.
AQ250 SERIES HYDRONIC CONTROL PANELS
Fig. 3. Orientation of wire channel plugs for creating pass-through wire channel and
for joining Control Panel to Expansion Zoning Panels.
Mount and Wire Thermostats in the Zones
Install the thermostats on the walls in the zones that are to be
controlled by the AQ250 Control Panel.
When using AQ1000 thermostats refer to the installation
instructions included with the AQ1000 thermostats.
If not done already, run low voltage thermostat wire (24 gauge
or heavier) from the thermostats back to the Zoning Modules
connected to the AQ250 Control Panel.
NOTES: If not otherwise specified, low voltage wiring should
be run with 18 gauge thermostat wire and line voltage
wiring should be run with 14 gauge wire. AQUATROL
line voltage screw terminals are only approved for use
with 22 to 12 gauge copper conductors.
Several wiring diagrams are included in this document. For additional information, refer to
http:// customer.honeywell.com or your local distributor.
3WIRING PROCEDURE
The AQ250 Control Panel is pre-wired at the factory, making
for faster installation.
For all models, the low voltage output terminals located at the
top of the transformer secondary are wired to the R and C input
terminals of the Control Module, as well as the R and C inputs
of the Zoning Module. The B-B Exp. Bus terminals (13 and 14)
of the Control Module are wired to the B-B Exp. Bus IN
terminals of the Zoning Module.
Beginning with the top left of Fig. 4 on page 6 and moving
clockwise around the panel, wire components to the AQ250
Control Panel and Expansion Zoning Panels (if installed) in the
following six steps:
• “Step 1 – Transformer Wiring” on page 6
• “Step 2 – Control Panel Wiring” on page 6
• “Step 3 – Thermostats Wiring” on page 8
• “Step 4 – Zoning Equipment Wiring” on page 8
• “Step 5 – Line Volt age System Output s” on p age10
• “Step 6 – Connection To Line Voltage Power” on page 13
568-0306—05
AQ250 SERIES HYDRONIC CONTROL PANELS
A
STEP 1STEP 2STEP 3
TO EXPANSION ZONING MODULES
(IF INSTALLED)
ZR
Fig. 4. Wiring sequence.
Step 1 – Transformer Wiring
Factory pre-wiring of the Control Panels is shown as dotted
lines in Fig. 4.
In addition to the pre-wiring, run low voltage jumper wires from
available R and C terminals on the secondary of the
transformer to the R and C terminals of any Expansion Zoning
Panel.
Step 2 – Control Panel Wiring
Wire the Temperature Sensors, System Demands, Low
Voltage Outputs, and Communication Bus (Refer to Fig. 5 for
wiring terminals on the top of the AQ250):
• “Temperature Sensor Wiring”
• “System Demands Wiring” on page 7
• “Low Voltage Outputs Wiring” on page 7
• “Communication Bus Wiring” on page 7
DHW
Boiler
Aux
STEP 5STEP 6
ZRBoi l er
STEP 4
Aux.
DHW
M29034
Temperature Sensor Wiring
Connect the lead wires of each sensor to the corresponding
terminals on top of the AQ15000B Control Module. See Fig. 5.
The Boiler Supply and Return sensors can be installed either
as strap-on sensors or inserted into an immersion well that is
packed with thermally-conductive paste.
BOILER SUPPLY AND RETURN SENSORS
the Supply and Return Sensors should be installed on the
Both
supply and return piping of the boiler for proper operation of
the AQ250 Control Panel. Even if the AQ250 is connected to a
modulating condensing boiler with its own supply and/or return
sensors, the AQ250’s sensors should still be installed for the
control to operate.
The Boiler Supply water sensor should be installed on the
supply piping close to the exit port of the boiler, using one of
the AQ12C11 strap-on sensors supplied with the AQ250. See
Fig. 6 on page 7.
TO DHW AQUASTAT
(OPTIONAL)
TO “T-T” TERMINALS ON
BOILER AQUASTAT
TO B-B “EXP.BUS IN”
TERMINALS ON CONNECTED
ZONING MODULE
M29035A
IN FROM “C” TERMINAL
ON TRANSFORMER MODULE
ON TRANSFORMER MODULE
(FACTORY-WIRED)
(FACTORY-WIRED)
IN FROM “R” TERMINAL
TO BOILER SUPPLY SENSOR
TO BOILER RETURN SENSOR
TO SETPOINT LOAD
Fig. 5. Low voltage wiring for the AQ1520M0 Control
Module.
68-0306—056
The Boiler Return sensor should be installed on the return
piping as close to the entrance port to the boiler as practical,
using the other AQ12C11 strap-on sensor supplied with the
AQ250. The correct location is one that will measure the
temperature of all combined sources of water returning back to
the boiler.
Insulate strap-on sensors with pipe wrap to ensure accurate
boiler temperature sensing.
The Boiler Supply and Return water sensors come with 10 ft.
(3m) of wire to minimize the need for splicing.
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