Honeywell AQ25A Series User Manual

AQ251 SERIES BOILER RESET CONTROL PANELS
69-1974—04 6
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.
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
Fig. 4. Wiring sequence.
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.
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
Fig. 5. Low voltage wiring for the AQ15100B Control Module.
M27738
A
Menu
Home
OK
Zone 1
Zone 2 Zone 3
Zone 4
STEP 1 STEP 2 STEP 3
STEP 4STEP 5STEP 6
TO EXPANSION ZONING MODULES
(IF INSTALLED)
TO BOILER SUPPLY SENSOR TO BOILER RETURN SENSOR
TO OUTDOOR SENSOR
IN FROM “R” TERMINAL ON TRANSFORMER MODULE (FACTORY-WIRED)
TO “T-T” TERMINALS ON BOILER AQUASTAT
TO B-B “EXP.BUS IN” TERMINALS ON CONNECTED ZONING MODULE
TO SETPOINT LOAD (OPTIONAL)
TO DHW AQUASTAT
IN FROM “C” TERMINAL ON TRANSFORMER MODULE (FACTORY-WIRED)
M27739A
TO LOW VOLTAGE AUXILIARY DEVICE (OPTIONAL)
TO AUXILIARY INPUT SWITCH (OPTIONAL)
TO MODULATING INPUT ON BOILER

Honeywell AQ25A Series Specifications

General

Brand	Honeywell
Model	AQ25A Series
Category	Control Panel
Language	English