Installation Preparation - Honeywell AQ25A Series Technical Reference Booklet

Mixing Valve Output (floating, open/close) (dry relay):
24 Vac, 12 VA
Interface and Timings:
User Interface (Setting, Programming): LCD Display
and a 7-button keypad
Setback Program: 7 day, up to 2 setback periods/day.
DHW Valve Open: 0-230 seconds, before boiler loop
pump is energized.
DHW Purge: Yes/No; selects whether purge is applied
after a DHW demand is served
Boiler Heat Post Purge: Off, 10 seconds to 30 minutes
(factory default is 30 seconds)
Pump/Valve exercise: 30 seconds per 2 weeks of space
heating inactivity

1 INSTALLATION PREPARATION

NOTES: Throughout these instructions, the following
terminology conventions are used:
• AQ251 refers to all of the AQ25142B, AQ25144B and
AQ25110B Control Panels. Where there are specific
instructions or details relating to the "-42B", "-44B", or
"-10B" Control Panels, the full model number (i.e.
AQ25144B) is used;
• Control Panel refers to an assembled product, con-
sisting of a transformer, Control Module and Zoning
Module, all contained within an AQ2000 panel enclo-
sure;
• AQ255 refers to all of the AQ25542B, AQ25542B,
AQ25582B and AQ25742B Expansion Zoning Pan-
els, and AQ257 refers to the AQ25744B Expansion
Zoning Panel. Where there are specific instructions
or details relating to the "-42B", "-82B", "-42B", or
"-44B" Expansion Zoning Panels, the full model num-
ber (i.e. AQ25744B) is used;
• Expansion Zoning Panel refers to an assembled
product, consisting of a Zoning Module and—if appli-
cable—a transformer, contained within an AQ2000
panel enclosure; Expansion Zoning Panels are avail-
able in either 4-zone or 8-zone configurations. See
Table 1 in "AQ2000 Series Expansion Zoning Panels"
(form no. 69-1981) for specific models.
• AQ151 refers to the AQ15100B Control Module -
within an AQ251 Series Control Panel.
• Control Module refers to the component within an
AQ251 Series Control Panel that performs the "mas-
ter control operations". See Table 1 for specific mod-
els.
• Zoning Module refers to the component within the
AQ251 Series Control Panel that controls zoning
operations;
• AQ155 refers to the AQ15540B Zoning Module and
AQ157 refers to the AQ15740B Zoning Module.
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.
AQ251 SERIES BOILER RESET CONTROL PANELS
Thermostat Compatibility: Digital thermostats and/or
AQ1000 Series 2-wire communicating thermostats
Supply/Return Loop Sensor: 10K ohm NTC thermistor at
77°F (25°C) ± 0.5°F (±0.3°C). Lead length: 10 ft. (3.0 m); up
to 500 ft. (150 m) using 18 AWG or larger wire, beta=3892.
Outdoor Sensor: 10K ohm NTC thermistor at 77°F (25°C) ±
0.5°F (±0.3°C). Lead length: 15 ft. (4.6 m); up to 500 ft. (150
m) using 18 AWG or larger wire, beta=3892
Dimensions (HxWxD): 8 x 16 1/2 x 3 3/8 in. (20.3 x 42 x
8.5 cm) approximate
Weight: 4.9 lb. (2.3 kg)
Approvals: Canadian Standards Association: Certified, File
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.
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:
— AQ251 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 AQ251 Control
Panel)
• Outdoor temperature sensor (included with AQ251 Control
Panel)
• Low voltage thermostat wire
• Zoning equipment (zone valves or pumps)
Read All Instructions Carefully Before
Proceeding
The AQ251 Control Panels are a part of a totally new series 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.
3 69-1974—04