Mounting; Wiring Procedure - Honeywell AQ25A Series Technical Reference Booklet

2 MOUNTING

This section describes how to mount the Control Panel,
Expansion Zoning Panels, and the Thermostats.
Mount AQ25A Control Panel
Mount the control panel on the wall:
1. Use the template supplied with the AQ25A Series
Programmable Boiler Control Panel to mark mounting
holes for panels.
2. Install two top screws, mount the panel, and install the
two lower screws.
WIRE
CHANNEL
PLUGS
Fig. 3. Orientation of wire channel plugs for creating pass-through wire channel and
Mount and Wire Thermostats in the Zones
Install the thermostats on the walls in the zones that are to be
controlled by the AQ251 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 AQ25A Control
Panel.
NOTE: 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 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.
WIRE
CHANNEL
PLUGS
for joining Control Panel to Expansion Zoning Panels.
5
AQ25A SERIES PROGRAMMABLE BOILER CONTROL PANELS
Mount Expansion Zoning Panel(s)
If there are Expansion Zoning Panels to install, they should be
mounted on the wall now.
1. Remove wire channel plugs from the AQ25A Control
Panel and any Expansion Panels (see Fig. 3).
2. Mount Expansion Zoning Panel on the right-hand end of
the AQ25A 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 from a wiring channel between the Control Panel
and the Expansion Zoning Panel (see Fig. 3) and to
connect the two panels together.
4. Repeat steps 1–3 for any additional Expansion Zoning
Panels.

3 WIRING PROCEDURE

The AQ25A 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 (21 and 22)
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 AQ25A
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 9
• "Step 4 – Zoning Equipment Wiring" on page 9
• "Step 5 – Line Voltage System Outputs" on page 12
• "Step 6 – Connection to Line Voltage Power" on page 13
M23733A
69-2119—02