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AQ250 SERIES HYDRONIC CONTROL PANELS
The communication bus connections for AQ250 Control
Panels are pre-wired at the factory.
Step 3 – Thermostats Wiring
NOTE: The new AQ2000 panels will work with either digi-
tal (electronic) non-communicating thermostats
or AQ1000 communicating thermostats.
1. Using low voltage thermostat wire, connect one
thermostat from each zone to the corresponding
THERMOSTATS Zone X inputs on top of the Zoning
Module (see Fig. 8).
2. If there are additional zones (on Expansion Zoning
Panels) connected to this Zoning Module, run low
voltage thermostat wiring from the B-B Exp. Bus Out
connection (terminals 13 and 14) of the Zoning
Module to the B-B Exp. Bus. In connection (termi-
nals 3 and 4) on the Expansion Zoning Panel.
IMPORTANT
Do not run thermostat wires parallel, or close, to
telephone, Ethernet, or power cables. Cross all
power, Ethernet, and telephone wiring at right
angles.
If thermostat wires are located in an area with
strong sources of electromagnetic interference, or
EMI, (e.g., if thermostat wires are run in the same
electrical chase as line voltage wiring) use twisted
pair, shielded cable, or run wires in a grounded
metal conduit.
This is important, because the AQ1000
thermostats are communicating thermostats
which send and received data via the two wires
connecting them to the Zoning Module. This data
can be distorted by the EMI, potentially causing
the AQ250 to not operate properly.
3. Run low voltage thermostat wiring from the R and C
output terminals on the secondary of the AQ250
Control Panel's transformer to the R and C input ter-
minals on the Expansion Zoning Panel. As an alter-
native, you can run low voltage thermostat wiring
68-0306—07
DATA BUS
COMMUNICATION
WIRING
ZR
Boiler
DHW
Aux
Zone 1
AQ25042B
Fig. 7. Wiring for communication bus.
Zone 2
Zone 3
Zone 4
from the R and C terminals on the Zoning Module to
the R and C terminals on the Expansion Zoning
Panel.
Fig. 8. Connecting thermostats.
Step 4 – Zoning Equipment Wiring
Because the Zoning Module of the AQ25042B Control
Panel can be used with either line voltage pumps or valves,
or low voltage zone valves (with or without end switches),
field installed wiring of the correct voltage needs to be
connected to the zoning equipment terminals on the
bottom left portion of the Zoning Module.
Line Voltage – Circulators or Zone Valves
Refer to Fig. 9. Remove the plastic wiring barrier that is
located in the bottom wiring channel between the
AQ15000B Control Module and the Zoning Module. Run
jumper wires from the N and L terminals on the bottom of
the AQ250 Control Panel's transformer, through the wiring
channel across the bottom of the Control Panel, and to the
corresponding N and L terminals of the Zoning Module.
8
Zone 1
Zone 2
Zone 3
Zone 4
AQ25744B
M29036A
M13776C
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