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AQ252 Universal Injection/Mixing Boiler Reset Control Panels
WARNING
Risk of electrical shock.
Can cause severe injury, property damage or death.
Disconnect power supply before installation and before
servicing.
Check That You Have All the Necessary
Equipment For a Successful Installation
• AQ2000 Series components:
— AQ252 Control Panel
— AQ Expansion Zoning Panels (if more than four space
heating zones in the system)
— Digital thermostats (one for every space heating zone
being controlled)
• Boiler supply and return temperature sensors and
secondary loop sensor (included with the AQ252 Control
Panel)
• Outdoor temperature sensor (included with AQ252 Control
Panel)
• Low voltage thermostat wire
• Zoning equipment (zone valves or pumps)
Read All Instructions Carefully Before
Proceeding
The AQ252 Control Panels are a 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
are 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.
Familiarize Yourself With the AQ252 Control
Panel Layout
Refer to Fig. 1. All AQ252 Control Panels consist of three
functional components:
1. AQ10X38 transformer (power supply module), which
connects to 120 Vac power and supplies 24 Vac power to
the Control Module and Zoning Modules
2. AQ15200B boiler/DHW Control Module, which controls
the boiler and domestic hot water (DHW) functions,
mixing operation for the secondary loop, as well as
coordinating the overall operation of the hydronic
system.
3.
One of two different 4-zone Zoning Modules:
• AQ15740B (part of the AQ25244B Control Panel)
for zoning with 24 Vac zone valves with end
switches.
• AQ15540B (part of the AQ25242B Control Panel)
for zoning with either line voltage circulators or 24
Vac zone valves without end switches.
AQ252 Control Panels can control a maximum of 16 zones by
connecting additional Expansion Zoning Panels to the AQ252
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
AQ252 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 maximum of 64 zones connected
on the AQUATROL network.
In general, the top terminals of the AQ2000 Series components
carry low voltage (24 Vac) power and the bottom terminals
carry line voltage (120 Vac) power. This is illustrated in Fig. 1.
The two exceptions to this are:
1. AQ15740B Zoning Module for use with zone valves with
end switches.
2. AQ15540B Zoning Module when used with low voltage
zone valves without end switches.
For these the two exceptions, the bottom terminals of the
Transformer and Control Module carry line voltage (120 Vac),
but the bottom terminals of the Zoning Module will carry low
voltage (24 Vac) power.
The powered terminals on the bottom of the AQ2000 Series
Control Modules and Zoning Modules are connected internally,
as shown in Fig. 2 on page 5. The voltage supplied to the N
and L terminals is also available at the adjacent terminal pairs
when the hot ( ) relays are switched.
Page 4
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