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 AQ252 Control Panel.
When using AQ1000 thermostats refer to the installation
instructions (form #69-2005) included with the AQ1000
thermostats.
If not done already, run low voltage thermostat wire (24 gauge
or heavier) from the thermostats back to the Zoning Modules
connected to the AQ252 Control Panel.
NOTES: 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 only 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.
STEP 1
STEP 6
Step 1 – Transformer Wiring
Factory pre-wiring of the Control Panels is shown as dotted
lines in Fig. 4.
In addition to the pre-wiring, run low voltage jumper wires from
available R and C terminals on the secondary of the
transformer to the R and C terminals of any Expansion Zoning
Panel.
AQ252 Universal Injection/Mixing Boiler Reset Control Panels

3 WIRING PROCEDURE

The AQ252 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 (26 and 27)
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 and moving clockwise
around the panel, wire components to the AQ252 Control
Panel and Expansion Zoning Panels (if installed) in the
following six steps:
®
• "Step 1 – Transformer Wiring"
• "Step 2 – Control Panel Wiring"
• "Step 3 – Thermostats Wiring" on page 9
• "Step 4 – Zoning Equipment Wiring" on page 11
• "Step 5 – Line Voltage System Outputs" on page 13
• "Step 6 – Connection To Line Voltage Power" on page 14
TO EXPANSION ZONING MODULES
(IF INSTALLED)
STEP 2
STEP 5
Fig. 4. Wiring sequence.
Step 2 – Control Panel Wiring
Wire the Temperature Sensors, System Demands, Low
Voltage Outputs, and Communication Bus (Refer to Fig. 5 on
page 8 for wiring terminals on the top of the AQ252):
• "Temperature Sensor Wiring" on page 8
• "System Demands Wiring" on page 9
• "Low Voltage Outputs Wiring" on page 9
• "Communication Bus Wiring" on page 10
7
STEP 3
Zone 1 Zone 2 Zone 3 Zone 4
STEP 4
M27684A
69-1986—02