Wiring Procedure - Honeywell AQ25A Series Technical Reference Booklet

Mount and Wire Thermostats in the Zones
Install the thermostats on the walls in the zones that are to be
controlled by the AQ2000 Series panels, and (if not done
already) run low voltage thermostat wire (24 gauge or heavier)
from the thermostats back to the Zoning Modules connected to
the AQ254 Control Panel.
When using AQ1000 thermostats, refer to the installation
instructions included with the AQ1000 thermostats.
Connect floor sensors (part # AQ12C20) to the thermostats for
any space heating zones with in-floor heating, where
temperature regulation of the floor is required.
Spare Fuse
The AQ254 includes a fuse to protect the electronic circuit that
drives the variable speed injection pump output. Although it is
unlikely that the fuse will be blown – as injection pumps rarely if
ever exceed the 1/6 HP rating for this output – there is a spare
fuse attached to the side of the AQ254 housing. See Fig. 3 for
location of this spare fuse. If additional replacement fuses are
needed, please contact Honeywell Technical Support at 1-800-
318-0815.
3A FUSE
Fig. 3. Location of spare fuse for AQ254
Expansion Control Panel
AQ25400B "ADD-A-TEMPERATURE" EXPANSION CONTROL PANEL

2 WIRING PROCEDURE

The AQ254 Control Panel is pre-wired at the factory, making
for faster installation:
• The low voltage output terminals located at the top of the
AQ10X38 transformer are wired to the R and C input
terminals of the AQ15400B Control Module, and
• The line voltage terminals on the bottom of the AQ10X38
transformer are connected to the N and L terminals on the
bottom of the AQ15400B Control Module.
NOTES: If not otherwise specified, low voltage wiring should
Beginning with the top left of Fig. 4 on page 6 and moving
clockwise around the panel, wire components to the AQ254
Expansion Control Panel and Expansion Zoning Panels (if
installed) in the following six steps:
• "Step 1 – Low Voltage Transformer Wiring" on page 7
• "Step 2 – Low Voltage Control Panel Wiring" on page 7
• "Step 3 – Communications Bus Wiring" on page 8
• "Step 4 – Line Voltage Wiring" on page 8
• "Step 5 – Connection to Expansion Zoning Panels" on
page 8
• "Step 6 – Connection to Line Voltage Power" on page 8
SPARE
FUSE
M13884
5
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 14 gauge copper conductors.
Several wiring diagrams are included in this
document. For additional information, refer to
http:// customer.honeywell.com or your local
distributor.
69-1987—02