Installation Preparation - Honeywell AQ25A Series Technical Reference Booklet

1 INSTALLATION PREPARATION

NOTES: Throughout these instructions, the following
terminology conventions are used:
— AQ155 refers to the AQ15540B Zoning Module.
— AQ157 refers to the AQ15740B Zoning Module.
— AQ255 refers to all of the AQ25542B, AQ25582B and
AQ25742B Expansion Zoning Panels.
— AQ257 refers to the AQ25744B Expansion Zoning
Panel. Where there are specific instructions or details
relating to the -42B, -82B, or -44B Expansion Zoning
Panels, the full model number is used
(e.g., AQ25744B).
— AQ2000 Series Control Panel is used when the
information applies to any of the AQ2000 Series Boiler
Control Panels, including AQ25A, AQ250, AQ251,
AQ252, etc.
— Control Module refers to the component within the
AQ2000 Series Control Panel that performs the
master control operations.
— Control Panel refers to an assembled product,
consisting of a transformer, Control Module and (if
applicable) a Zoning Module, all contained within an
AQ2000 panel enclosure.
— Expansion Zoning Panel refers to an assembled
product, consisting of a Zoning Module and (if
applicable) a transformer, contained within an AQ2000
panel enclosure.
— Zoning Module refers to the component within the
AQ2000 Series Control Panel that controls zoning
operations. Zoning Modules are available in either
4-zone or 8-zone configurations.
When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
the application.
3. Installers must be trained, experienced, and licensed
service technicians.
4. Follow local codes for installation and application.
5. After installation is complete, check out the product
operation as printed in these instructions.
AQ255 AND AQ257 SERIES EXPANSION ZONING 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
— AQ2000 Series Control Panel – already installed
— AQ Expansion Zoning Panel(s)
— Digital Thermostats (one for every space heating zone
being controlled)
• Low voltage thermostat wire
• Zoning equipment (zone valves or pumps)
Read All Instructions Carefully Before
Proceeding
The AQ2000 Series 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. Take a moment to read through this
document before beginning the installation. Failure to follow
these instructions could damage the product or cause a
hazardous condition.
Familiarize Yourself With the AQ255 / AQ257
Expansion Zoning Panel
Refer to Fig. 1 on page 4. In general, the top terminals of all
AQ255 / AQ257 Expansion Zoning Panels carry low voltage
(24Vac) power and the bottom terminals carry either line
voltage (120 Vac) power for the AQ25542B and AQ25582B
models, or low voltage (24 Vac) power for the AQ25742B and
AQ25744B models. The two exceptions to this are:
1. AQ25744B Expansion Zoning Panel for use with zone
valves with end switches.
2. AQ25742B Expansion Zoning Panel when used with low
voltage zone valves without end switches.
For these the two exceptions, the bottom terminals of the
AQ10X38 Transformer carry line voltage (120 Vac), but the
bottom terminals of the Zoning Module will carry low voltage
(24 Vac) power.
3 69-1981—03