Honeywell AQ25A Series Technical Reference Booklet page 299

Transformer Module
• Powerful 38 VA capacity
• Factory pre-wired to the control and
zoning modules
• Powerful enough to drive internal electronics,
up to 16 thermostats and 4 zone valves**
without needing to add external transformers
• Self-resetting electronic fuse protects
transformers from excessive load equipment
from zoning
** Applies to most electric and thermally actuated zone valves,
like Honeywell V8043E1012 or MT-4. High power-consuming
zone valves (such as Taco heat motor valves) will require
additional (up to four times more) transformer capacity (VA).
Expansion/Diagnostics
Control Module
• Large dot matrix display with easily
understandable menus (full words, no
acronyms or icons)
• Displays valuable system information
and diagnostics on system status page
for quick troubleshooting
• Easy-to-read backlit screen
• Simple and logically laid-out
menu selection
• Clearly labeled input and
output connections
• Integrated control of Domestic Hot
Water — priority and priority override
Zone 1
Power In
Zoning Module
• LED lights for valuable diagnostics
• Auto test function allows for sequenced testing of
zones; includes pause/restart capability
• Easily switch from zone valves to pumps with
same zoning module – just flip one DIP switch
• Allows zoning with either "Normally Open" or
"Normally Closed" zone valves
• Zones can be set to operate group pump
• Expansion zoning panels connect quickly and
easily and can be connected directly to main AQ
panel or in another part of the house – up to 500
feet away!
• Adjacent zoning panels can operate different
zone equipment — one panel may control 4
pumps and another may control 4 zone valves
Thermostats
Zone 2 Zone 3 Zone 4
Power Out — Zones
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