Purge Air From All System And Zone Piping; Document And Keep A Record Of All System Settings - Honeywell AQ25A Series Technical Reference Booklet

AQ25400B "ADD-A-TEMPERATURE" EXPANSION CONTROL PANEL
4. Turn down the set point of the AQ1000 zone thermostat.
The zone valve or pump associated with that zone will
turn off.
5. The Boiler T-T, SEConday pump, and Boiler pump relay
outputs will be de-activated.
Repeat steps 2-5 for all zones associated with the AQ254's
mixed temperature loop.
6. Turn up the DHW AQUASTAT to simulate a call for
domestic hot water.
6.1 If the DHW device is a pump, the DHW relay output
will be energized immediately. The Boiler pump relay
will remain off.
6.2 If the DHW device is a valve, the Boiler pump relay
will come on after a delay to allow the zone valve to
fully open. This delay is installer-defined from the
EQUIPMENT SETUP>ZONING>TIME TO OPEN
menu of the Main AQ2000 Series Control Panel.
6.3 Turn up the set point of one of the AQ1000 zone
thermostats connected to the AQ254.
6.3.1 If the DHW relay is configured to control a
pump, and DHW Priority is selected, the
Boiler and the associated zone pumps relay
will remain off.
6.3.2 If the DHW relay is configured to control a
valve, and DHW Priority is selected, the Boiler
pump will be activated after a delay for the
DHW zone valve to open, but the associated
zone relays will remain off.
6.3.3 If DHW Priority is disabled, space heating
zone pumps and valves will operate even
during a call for DHW.
7. Turn down the DHW AQUASTAT to end the call for
domestic hot water. Space heating operation should con-
tinue (if DHW priority is disabled) or resume (if DHW pri-
ority is enabled).
8. Repeat steps 3 through 7 for all space heating zones
connected to an AQ254.
5 PURGE AIR FROM ALL SYSTEM
AND ZONE PIPING
The PURGE operation on the AQ254 Expansion Control Panel
allows the installer to purge all zones (loops) sequentially, or
each zone individually, for a period of time selected in the
TEST > PURGE menu. Purge time can be adjusted in
increments of one minute, up to a maximum of 30 minutes per
loop to be purged. After using the AQ254's menus to select
which loops to purge (ALL loops, or an individual loop) and for
how long, position the indicator arrow (←) beside the START
option and press the OK button. The START display will
change to STOP and the AQ254 display will begin counting
down the time remaining for the purge cycle.
Purging All Loops
When the purge time has elapsed for the first loop, the control
will proceed to subsequent loops and perform the purge
operation on each of them. After all selected loops have been
purged, the display shows COMPLETE.
69-1987—02
Note that only the loops controlled by the AQ254 are purged.
This means that:
1. Zones that are programmed to use water on the PRI-
mary (boiler) loop will have their pump running while the
Boiler pump (on the Main AQ2000 Series Control Panel)
is not running;
2. Other AQ254 loops will not have been purged when the
COMPLETE indication displays.
To remedy to this, it is preferable to use the Main AQ2000
Series Control Panel's PURGE operation, which has the
overall system control to achieve an efficient PURGE routine
for all zones
6 DOCUMENT AND KEEP A RECORD
OF ALL SYSTEM SETTINGS
After the hydronic installation with the AQ254 Control Panel
has been set up and is operating properly, it's important to
document all the system settings for future reference.
Job Records
All AQ2000 Series Panels are shipped with Installation Job
Records for documenting these settings. These should be filled
out completely and saved in the Installing Contractor's files.
Save Feature
In addition to the hardcopy Installation Job Records, the
AQ254 Control Panel has a convenient Save feature that
allows the installing contractor to save the specific equipment
setting for this installation in the AQ254's memory for future
recall, in case the system's settings are inadvertently changed.
This feature is found in the SETUP > SAVE menu of the
AQ254.
There are three levels of settings in the AQ254's memory –
CURRENT, FACTORY and SETUP.
• CURRENT settings are the settings that are currently
displayed in any of the menus and are the settings that the
AQ254 uses to operate. Any time a value is changed in any
of the menus, the CURRENT settings are changed and
these new settings are instantly used by the AQ254 Control
Panel.
• FACTORY settings are the default values loaded at the
factory and are the starting point for programming the
AQ254. These values are permanently stored in memory
and cannot be over-written or erased. The AQ254 can be
restored to factory settings through the FACTORY option in
the SAVE / RESTORE sub-menu. A warning prompt,
RESTORE FACTORY—ARE YOU SURE?, displays and
YES or NO must be chosen before proceeding. If YES is
selected, the FACTORY settings are copied to the AQ254's
CURRENT settings and the Control Panel begins to operate
with these values immediately.
• SETUP settings are the specific settings for this installation
which an installer has saved after the AQ254 is set up and
operating well. These are saved for future recall, in case the
system's settings are inadvertently changed.
— To save settings for the first time, navigate to the
SETUP > SAVE menu. Position the indicator arrow (←)
beside SAVE and press OK. This saves current system
settings to the SETUP values.
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