Honeywell AQ25A Series Technical Reference Booklet page 47

AQ250 Series Hydronic Control Panels
Need new photo of AQ250
PRODUCT DESCRIPTION
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 using up to three
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
To ensure correct installation and proper operation of
the control, perform the 7 installation steps in the
order numbered in the "Contents" below.
Specifications ...................................................................
1 Installation Preparation ..................................................
2 Mounting ........................................................................
3 Wiring Procedure ...........................................................
4 Configure the Control Panel DIP Switches .................... 14
5 Test and Check Out the Installation ............................... 17
6 Purge Air from all System and Zone Piping .................. 19
7 Document and Keep a record of all System Settings .... 19
Troubleshooting ................................................................ 19
PRODUCT DATA
Contents
2
3
4
5
68-0306-02