Honeywell AQ250 Series Product Data page 6

AQ250 SERIES HYDRONIC CONTROL PANELS
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):
• "Temperature Sensor Wiring"
• "System Demands Wiring" on page 7
• "Low Voltage Outputs Wiring" on page 7
• "Communication Bus Wiring" on page 7
Fig. 5. Low voltage wiring for the AQ1520M0 Control
Module.
68-0306—05
TO EXPANSION ZONING MODULES
(IF INSTALLED)
ZR
STEP 6
Fig. 4. Wiring sequence.
M29035A
6
STEP 2
ZR
Boiler DHW Aux
STEP 5
Temperature Sensor Wiring
Connect the lead wires of each sensor to the corresponding
terminals on top of the AQ15000B 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.
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 AQ250 Control Panel. Even if the AQ250 is connected to a
modulating condensing boiler with its own supply and/or return
sensors, the AQ250'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 AQ250. See
Fig. 6 on page 7.
The Boiler Return sensor should be installed on the return
piping as close to the entrance port to the boiler as practical,
using the other AQ12C11 strap-on sensor supplied with the
AQ250. The correct location is one that will measure the
temperature of all combined sources of water returning back to
the boiler.
Insulate strap-on sensors with pipe wrap to ensure accurate
boiler temperature sensing.
The Boiler Supply and Return water sensors come with 10 ft.
(3m) of wire to minimize the need for splicing.
STEP 3
Boiler DHW Aux.
STEP 4
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