Honeywell AQ25A Series Technical Reference Booklet page 12

AQ25A SERIES PROGRAMMABLE BOILER CONTROL PANELS
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 to the R and C terminals of any
Expansion Zoning Panel.
Temperature Sensor Wiring
Connect the lead wires of each sensor to the corresponding
terminals on top of the AQ15A Control Module. See Fig. 5.
The Boiler Supply and Return sensors can be installed either
as strap-on sensors or inserted into an immersion well that is
packed with thermally conductive paste.
69-2119—02
TO EXPANSION ZONING MODULES
(IF INSTALLED)
STEP 2
Fig. 4. Wiring sequence.
Fig. 5. Low voltage wiring for the AQ15A10B Control Module.
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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 AQ25A):
• "Temperature Sensor Wiring"
• "System Demands Wiring" on page 7
• "Low Voltage Outputs Wiring" on page 8
• "Communication Bus Wiring" on page 8
BOILER SUPPLY AND RETURN SENSORS.
Both the Supply and Return Sensors should be installed on the
supply and return piping of the boiler for proper operation of
the AQ25A Control Panel. Even if the AQ25A is connected to a
modulating condensing boiler with its own supply and/or return
sensors, the AQ25A's sensors should still be installed for the
control to operate.
The Boiler Supply water sensor should be installed on the
supply piping close to the exit port of the boiler, using one of
the AQ12C11 strap-on sensors supplied with the AQ25A (see
Fig. 6 on page 7).
6
STEP 3
Zone 1 Zone 2 Zone 3 Zone 4
STEP 4
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