Honeywell AQ25A Series Technical Reference Booklet page 54

AQ250 SERIES HYDRONIC CONTROL PANELS
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. 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 (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 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 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. 8. Connecting thermostats.
68-0306—02
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.
FROM LINE VOLTAGE
120V TERMINALS
(N AND L) ON BOTTOM
OF TRANSFORMER
Fig. 9. Wiring an AQ15540B Zoning Module for use
Low Voltage – Zone Valves With or Without End
Switches
IMPORTANT
If low voltage zone valves are used with the
AQ25042B Control Panel, the supplied Low Voltage
Output sticker (shown in Fig. 10) must be applied
over the line voltage output sticker (see Fig. 9) that is
already attached to the Zoning Module.
WIRING ZONE VALVES WITHOUT END SWITCHES
— Using Fig. 11 on page 9 as a guide, run jumper wires
from the R and C terminals on the secondary of the
AQ250'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.
M13776C
8
with line voltage circulators.
Fig. 10. Low voltage output sticker.
M29037A
M27688A