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AQ250 SERIES HYDRONIC CONTROL PANELS
3 WIRING PROCEDURE
The AQ250 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 (13 and 14) of the Control Module are wired to
the B-B Exp. Bus IN terminals of the Zoning Module.
STEP 1
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 AQ250):
• "System Demands Wiring" on page 7
• "Low Voltage Outputs Wiring" on page 7
• "Communication Bus Wiring" on page 7
68-0306-07
TO EXPANSION ZONING MODULES
(IF INSTALLED)
ZR
STEP 6
Fig. 4. Wiring sequence.
Beginning with the top left of Fig. 4 on page 6 and moving
clockwise around the panel, wire components to the
AQ250 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 8
• "Step 4 - Zoning Equipment Wiring" on page 8
• "Step 5 - Line Voltage System Outputs" on page 10
• "Step 6 - Connection To Line Voltage Power" on
page 13
STEP 2
ZR
Boiler
DHW
Aux
STEP 5
Fig. 5. Low voltage wiring for the AQ1520M0 Control
Temperature Sensor Wiring
Connect the lead wires of each sensor to the
corresponding terminals on top of the AQ15000B Control
Module. See Fig. 5.
6
STEP 3
Boiler
Aux.
DHW
STEP 4
M29034A
Module.
M29035A
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