Honeywell AQ25A Series Technical Reference Booklet page 160

AQ25400B "ADD-A-TEMPERATURE" EXPANSION CONTROL PANEL
Step 3 – Communications Bus Wiring
Connect the communication bus wiring from the Exp Bus Out
(terminals 13 and 14) of the last Zoning Module or Panel
connected to the AQ2000 Series Master Control Panel, to the
Exp.In connection (terminals 11 and 12) of the AQ254.
Connect the communication bus wiring from the Exp. Out
(terminals 13 and 14) of the AQ15400B Control Module to the
Exp Bus In connection (terminals 3 and 4) of the first
Expansion Zoning Panel. Wire any additional Expansion
Zoning Panels connected to the AQ254 in a daisy-chain
fashion, connecting the Exp Bus Out (terminals 13 and 14) of
one Expansion Zoning Panel to the Exp Bus In connection
(terminals 3 and 4) of the next Zoning Expansion Panel.
If more than one AQ254 Control Panel will be installed in this
system, note that the Communication Bus wiring for each
AQ254 Panel must connect to the data bus of the Main
AQ2000 Series Control Panel or the Expansion Zoning Panels
connected to it (i.e. Group A on the AQ network); See Fig. 5 on
page 7 for wiring multiple AQ254 Expansion Control Panels to
an AQ2000 Series network. Any of the connection points
*
marked as location " " in Fig. 5 are acceptable.
Step 4 – Line Voltage Wiring
Next, connect the line voltage equipment – the secondary
system pump (SEC) and, if required, the variable speed
injection pump (Var. Injection) – to the bottom of the
AQ15400B Control Module.
If an optional AUX.Pump or other line voltage device will be
used with the line voltage-rated AUXiliary dry contacts, wire it
in at this point. The AUX.Pump dry contacts are line voltage-
rated but unpowered. To connect a line voltage auxiliary device
to these contacts, such as a group pump, power the device
from the N and L terminals on the bottom of the AQ1540
Control Module, running the L (hot) lead through the
AUX.Pump contacts and then to the installed device. See
Figure 6 for an example of how to connect a group pump to the
Aux.Pump contacts of the AQ254.If a low voltage device is
connected to the AUX.Pump contacts, the wire insulation must
be suitable for use in line voltage enclosures.
Power
Sec.
GROUP PUMP
Fig. 6. Wiring of the AUX. Pump line voltage-rated dry
contacts (example shown is a group pump).
69-1987—02
Var. Injection
Var. Injection Fuse
3A 250V
M27811A
8
Step 5 – Connection to Expansion Zoning
Panels
Connect the N and L line voltage inputs of the AQ254 (at the
bottom of the AQ10X38 transformer) to the N and L line
voltage inputs on the bottom of the Expansion Zoning Panel
(the AQ10X38 transformer for Valve Zoning Panels) or the
Zoning Module itself (for Pump Zoning Panels). A service
switch should be installed on the hot (L) lead to the distribution
panel.
NOTE: For information related to wiring any connected
Expansion Zoning Panels, see "AQ2000 Series
Expansion Zoning Panels - Product Data sheet" Hon-
eywell literature number 69-1981.
Step 6 – Connection to Line Voltage Power
Finally, provide line voltage power to the AQ254 "Add-A-
Temperature" Expansion Control Panel by connecting one of
the sets of N and L terminals located on its AQ10X38
transformer to the corresponding N and L terminals on the
AQ10X38 transformer of the AQ2000 Series Main Boiler
Control Panel (e.g. AQ250, AQ25A, AQ251, AQ252, etc.), or
directly to the electrical distribution panel. A service switch
should be installed on the hot (L) lead to the distribution panel.
Switch on power to the AQ254 in order to configure its
operating settings.
IMPORTANT
Be careful not to overload the electrical circuit to
which these Control Panels are connected. Calculate
the potential full load amp draw of all line voltage
equipment combined (system and zone pumps) and if
necessary, split up the Control Panels on more than
one 15A fused circuit.
If the AQ254 and the main AQ2000 Series Control
Panel are connected to separate circuits at the distri-
bution panel, ensure that both circuits are in phase
with each other
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment circuitry.
When line voltage is applied to the AQ254 Control
Panel and the front cover of the Panel is removed,
there is a risk of electrocution. Be careful to avoid
contact with the line voltage (N and L) terminals, either
with your fingers or with metal tools (such as a
screwdriver) when power is applied to the Control
Panel.