AQ250 SERIES HYDRONIC CONTROL PANELS
69-1982
2
1 Check You Have All the Necessary
Equipment For a Successful
Installation
A)
AQ2000 Series components
• AQ250 Control Panel
• AQ Expansion Zoning Panels (if more than four
space heating zones in the system)
• AQ1000 Thermostats (one for every space heating
zone being controlled)
B)
Boiler supply and return temperature sensors (included
with AQ250 Control Panels)
C)
Low voltage thermostat wire
D)
Zoning equipment (zone valves or pumps)
2 Read All Instructions Carefully
Before Proceeding
The AQ250 Control Panels are part of a totally new family of
hydronic controls! And although they - and other AQ2000
system components - are VERY easy to install and operate,
they’re different than other hydronic controls that you have
previously installed. So take a moment to read through this
quick installation guide BEFORE beginning the installation.
Failure to follow them could damage the product or cause a
hazardous condition.
3 Familiarize Yourself With The AQ250
Control Panel
Layout
AQ250 Control Panels consist of three functional
components:
• the AQ10X38 transformer (power supply module), which
connects to 120 Vac power and supplies 24Vac power to
the Control Module and Zoning Modules; and
• the AQ1500B0 boiler / DHW Control Module, which
controls the boiler and domestic hot water (DHW) functions
as well as coordinating the overall operation of the
hydronic system
• a Zoning Module capable of controlling 4 space heating
zones
The Zoning Module is available in two versions:
• AQ1574V4 (part of the AQ2504B4 Control Panel) for
zoning with 24 Vac zone valves with end switches
• AQ1554P2 (part of the AQ2504B2 Control Panel) for
zoning with either line voltage circulators or 24 Vac zone
valves without end switches.
AQ250 Control Panels can control a maximum of 16 zones by
connecting up to 3 additional Expansion Zoning Panels to the
AQ250 Control Panel. Each Expansion Zoning Panel is
configured with its own bank of DIP switches, located in the
left most section of each Zoning Module. To expand the
capacity of an AQ250 Control Module beyond 16 zones, an
AQ254 Add-A Temperature
Expansion Control Panel is
required. The hydronic system can be expanded by 16 zones
for each AQ254 connected to the AQ2000 network; a
maximum of
three (3) AQ254 Panels may be connected to an
existing AQ2000 Control Panel for a total system capacity of
64 zones.
NOTE: If an AQ254 is used for controlling the temperature in
a mixed loop, it can reset the that mixed loop temper-
ature using LOAD reset, but not OUTDOOR reset,
as the AQ250 panel does not have input terminals
for an outdoor sensor.
In general, the top terminals of all AQ2000 Series Control
Panel components carry low voltage (24 Vac) power and the
bottom terminals carry line voltage (120V) power. The only
exception to this is the AQ1554P2 Zoning Module when used
with low voltage zone valves (without end switches). In this
case, the bottom terminals of the Transformer and Control
Module carry line voltage, but the bottom terminals of the
Zoning Module will carry low voltage power.
Fig. 1 AQ250 Control Panel Layouts (AQ2504B4 shown)
Zone 1
Zone 2
Zone 3
Zone 4
ZR
Boiler
DHW
Aux
M23734A
LOW VOLTAGE
(24 V)
LOW VOLTAGE
(24 V)
ZONING MODULE
CONTROL MODULE
TRANSFORMER
LINE VOLTAGE
(120 V)
