Wiring Procedure - Honeywell AQ25A Series Technical Reference Booklet

AQ251 SERIES BOILER RESET CONTROL PANELS

3 WIRING PROCEDURE

The AQ251 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 are wired to the R and C input
terminals of the Control Module.
• For those Control Panel models that come with Zoning
Modules included, (all but the AQ25110B), the transformer's
low voltage outputs are also wired to the R and C inputs of
the Zoning Module. The B-B "Exp. Bus" terminals of the
Control Module are wired to the B-B "Exp. Bus IN" terminals
of the Zoning Module.
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.
69-1974—04
TO EXPANSION ZONING MODULES
(IF INSTALLED)
STEP 2
Fig. 4. Wiring sequence.
Fig. 5. Low voltage wiring for the AQ15100B Control Module.
Beginning with the top left of Fig. 4 and moving clockwise
around the panel, wire components to the AQ251 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 9
• "Step 5 – Line Voltage System Outputs" on page 12
• "Step 6 – Connection to Line Voltage Power" on page 13
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STEP 5
Step 2 – Control Panel Wiring
Wire the Temperature Sensors, System Demands, Low
Voltage Outputs, and Communication Bus (Refer to Fig. 5 for
wiring terminals on the top of the AQ251):
• "Temperature Sensor Wiring" on page 7
• "System Demands Wiring" on page 7
• "Low Voltage Outputs Wiring" on page 8
• "Communication Bus Wiring" on page 8
6
STEP 3
Zone 1 Zone 2 Zone 3 Zone 4
STEP 4
M27738A
M27739A