Honeywell AQ25A Series Technical Reference Booklet page 75

Step 3 – Thermostats Wiring
NOTE: The new AQ2000 panels will work with either digital
(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. 9).
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 (terminals 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 AQ251 to not operate
properly.
3. Run low voltage thermostat wiring from the R and C
terminals on the AQ251 Control Panel's transformer to
the R and C terminals on the Expansion Zoning Panel.
As an alternative, you can run low voltage thermostat
wiring from the R and C terminals on the Zoning Module
to the R and C terminals on the Expansion Zoning Panel.
Fig. 9. Connecting AQ1000 thermostats.
AQ251 SERIES BOILER RESET CONTROL PANELS
Step 4 – Zoning Equipment Wiring
Because the Zoning Module of the AQ25142B Control Panel
can be used with either low voltage zone valves (without end
switches) or line voltage pumps or valves, 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. 10. Remove the plastic wiring barrier that is
located in the bottom wiring channel between the AQ15100B
Control Module and the Zoning Module. Run jumper wires from
the N and L terminals on the bottom of the AQ251 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.
FROM LINE VOLTAGE
120V TERMINALS
(N AND L) ON BOTTOM
OF TRANSFORMER
Fig. 10. Wiring an AQ15540B Zoning Module for use
Low Voltage – Zone Valves With or Without End
Switches
Wire using step 1 for zone valves without end switches, or use
step 2 for zone valves with end switches:
1. Low voltage zone valves without end switches:
Using Fig. 12 on page 10 as a guide, run jumper wires
from the R and C terminals on the secondary of the
AQ251's transformer, through the wiring channel across
the top of the Control Panel, and down through the wiring
channel on the right side of the panel and over to the R
and C terminals on the bottom of the Zoning Module.
IMPORTANT
If low voltage zone valves are used with the
AQ25142B Control Panel, the supplied Low Voltage
Output sticker (shown in Fig. 11) must be applied
over the line voltage output sticker (see Fig. 10) that
is already attached to the Zoning Module.
M13776C
9
with line voltage circulators.
Fig. 11. Low voltage output sticker.
M27687A
M27688A
69-1974—04