Installer Menu - Honeywell AQ25A Series Technical Reference Booklet

AQ251 SERIES BOILER RESET CONTROL PANELS

Installer Menu

The Installer Menu allows you to set up and modify system
settings that typically would be adjusted by a trained installer.
These include equipment settings (for boiler operation, DHW
management, zoning, auxiliary input/output operation) and
option settings, such as pump/valve exercise, freeze
protection, and Save/Restore settings.
System statistics and the installer tools (Test and Purge) are
also available from the Installer Menu.
The two Installer Menu options are:
• Equipment Setup – refer to Table 6
• Test and Purge – refer to Table 7 on page 36
Menu Option
Installer-defined settings for the system design parameters (e.g., boiler supply and return
BOILER SETTINGS temperatures, reset mode, and outdoor low temperature)
HIGH LIMIT 12°F to 225°F (49°C to 107°C) 190°F
LOW LIMIT 60°F to 180°F (15°C to 82°C) 150°F
BOILER DIFF 2°F to 41°F (1°C to 23°C) /
AUTO
W.W.S.D. - -
35°F to 100°F (2°C to 38°C)
RESET OUTDOOR / LOAD / NONE
69-1974—04
Table 6. Installer Menu – Equipment Setup.
EQUIPMENT SETUP
Factory
Range Default
(88°C)
AUTO
70 °F
(21°C)
OUTDOOR
30
NOTE: Illustrations of the complete Installer Menu begin on
page 39.
To access the Installer Menu:
1. Press the Home button to return to the Home Page
display.
2. Press and hold the OK button for 3 seconds until the
message, INSTALLER MODE – ARE YOU SURE?,
displays.
3. Select YES, then press and release the OK button to
display the Installer Menu.
NOTE: To exit Installer Mode, select the Installer Exit menu
option.
Description
Maximum temperature that the control can use as a target
for the boiler supply water (HIGH LIMIT cannot be set
below the LOW LIMIT setting).
Minimum temperature that the control can use as a target
for the boiler supply water (LOW LIMIT cannot be set
above the HIGH LIMIT setting).
The temperature differential used by the control when
operating the boiler. The same differential is used for both
the HIGH LIMIT and the LOW LIMIT.
• If AUTO is selected, the differential is calculated
automatically by the AQ251 to maximize comfort and
minimize boiler short cycling.
• If a specific boiler differential (BOILER DIFF) is
selected, the AQ251 will apply 1/2 of this differential
above the AQ251's HIGH LIMIT boiler setting and the
other 1/2 below the HIGH LIMIT setting when
controlling the boiler supply water temperature.
• For example, if the High Limit = 190°F and the Boiler
Diff = 10°F, the High Limit range becomes 185-195°F.
NOTE: This formula also applies to the boiler differential
around the AQ251's LOW LIMIT.
Warm Weather Shut Down is the outdoor temperature
above which the AQ251 will not allow hot water to be sent
to a space heating zone. The boiler still operates to supply
hot water to DHW or a setpoint (HEAT) demand. The
WWSD feature can be disabled by reducing the WWSD
temperature below 35°F (2°C), at which point the display
will read "- - ".
NOTE: Disabling WWSD is not advisable. This will
increase the average reset temperature for the
Boiler Supply water, resulting in higher energy
consumption and less even heating.
Selects the calculation method (algorithm) that the control
uses to set the target temperature for the boiler supply and
secondary loop supply water. Choose LOAD for buildings
with high internal heat gains; otherwise use OUTDOOR.