Honeywell AQ25A Series Technical Reference Booklet page 288

Easy To Install. Easy To Use.
Honeywell Aquatrol AQ2000 Series controls are designed to keep even the most complex systems simple.
EASy SElECTIon
Selecting the proper components for each system has
never been easier:
• Selection tools are available both electronically and hardcopy
• Answering just a few simple questions gets you exactly the
right configuration of controls for the job — less than
one minute from design to Bill of Materials
EASy InSTAllATIon
Ready to use with minimal installer setup:
• All panels come pre-assembled with: modules – transformer,
boiler controller, and – for most panels – a zoning module
• Expansion panels allow for system design versatility
• Expansion panels add-on simply and require only six field-
installed wires to connect to the system
• Control panel enclosures designed with plenty of finger room for
wiring, and multiple ground terminals
• Integral low and line voltage wire conduit within panel enclosure
allows you to connect multiple panels together without the need
for running wire outside panels to connect them
EASy ChoICE
The list of reasons to choose Honeywell AQ2000 Series controls goes on and on:
• Zone synchronization — Extends boiler life and saves
energy by minimizing boiler cycling.
• Domestic hot water priority and priority override —
Ensures adequate DHW supply even on the coldest days
(priority) while still supplying sufficient hot water to space
heating zones during sustained DHW demand.
• Boiler post purge – saves energy by delivering retained
heat stored in the boiler to space heating or DHW zones
where it can be used
• Freeze protection – Increases equipment life by activating
all valves and pumps associated with any zones that
have either lost communication with the control or if
boiler water temperature gets close to freezing
• Pump/valve exercise — Extends equipment life by
periodically activating all valves and pumps to prevent
seasonal start-up problems.
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EASy CoMMISSIonInG/SET-UP
Get up and running swiftly:
• Pre-programmed with most popular settings
• Armchair programmable (can be programmed at your desk
and taken to the jobsite ready to install)
• Auto test program sequentially activates and tests all
system inputs and outputs to ensure correct operation
• Convenient purge feature facilitates removal of air from the
system at start-up with activation of single or multiple zones
as selected, defined by the installer
EASy TRoUblEShooTInG
Multiple features simplify troubleshooting during setup or
in the event of a malfunction:
• Zone LEDs are illuminated on calls for heat
• A "quiet, yet audible" click occurs when relays are activated
• Diagnostic data (including zone ID number) is displayed on
the LCD with valuable descriptions of system activity (boiler
and DHW operation, active inputs, outputs and demands,
communication status etc.) For AQ250, diagnostics data
are displayed by coded blinking of LEDs
• Heat demand priority (override) protection – Provides
optional system priority to auxiliary loads (pool, spa, etc)
if desired.
• Boiler short-cycling protection — Used in combination with
zone synchronization to keep boiler on for at least 2 minutes
and prevent boiler from firing for at least 2 minutes after the
last heating cycle.
• Auto test — Confirms equipment is in working order by
energizing and de-energizing all inputs and outputs at
time of commissioning. AQ250 tests all inputs/outputs in
sequence. AQ25A, AQ251 and AQ252 offer increased
flexibility, allowing for testing of only the inputs, outputs,
demands and other functions as needed.
• Auto purge — Sequenced purging of all zones, to quickly
remove air before system start-up. Not available on
the AQ250.