AQUATROL ZONE SYNCHRONIZING INJECTION/MIXING BOILER RESET CONTROLS
69-1990—03
6
TROUBLESHOOTING
Power Disruption
The AQ252’s system and thermostat (zone settings)
parameters are stored in non-volatile memory and are
updated as they change.
When a power disruption or loss of power occurs, the
system configuration is retained in memory.
When power is restored, the AQ252 Control Panel enters
auto-detection mode, reads its previously-stored settings,
and initializes all AQUATROL network components
according to their saved parameters.
POWER DISRUPTION GREATER THAN 4 HOURS
If a power disruption lasts for more than 4 hours, the
AQ252 will have discharged its internal super capacitor,
and the DATE and TIME OF DAY settings will need to be
reset.
Upon restart, the AQ252 displays its clock settings as:
YEAR = 2008, MONTH = JAN, DATE = 1. The message PLS
SET DAY/TIME displays. This displayed message
continues until the DATE and TIME OF DAY are updated.
NOTE:
If the power failure parameter is set to Backlight
(USER MENU > PREFERENCES/TIME), the LCD
backlight flashes repeatedly, along with the mes-
sage.
The AQ252 remains permanently in OCCUPIED (or
Comfort) mode until the DAY and TIME OF DAY are
updated.
System Status and Error Codes
System status alerts and error messages display on the
System Status Page. These messages are shown in
Table 2.
Table 2. LCD Status Notices and Error Messages.
LCD Display
Parameter
Meaning
A/C MIN. OFF TIME
n/a
The A/C compressor is disabled, because the minimum OFF time has not yet
elapsed.
A/C MIN. ON TIME
n/a
The A/C compressor is active and the minimum ON time has not yet elapsed.
AUX IN EM. SHUT
n/a
Auxiliary Input's Emergency Shut Down is active.
BOILER:
EM SHUT
Boiler is disabled, because the AQ252 is in Emergency Shut Down mode.
FRZ PROT
Boiler freeze protection activated:
•
Communication between Control Module and Zoning Module has been lost for
more than 1 minute
or
•
Boiler supply temperature is less than 50°F (10°C)
HEAT DHW
Boiler is active to serve DHW.
HEATING
Boiler is active to serve zones.
IDLE
Boiler is not active.
INIT
Boiler contacts (terminals 22 and 23) on the AQ1520, which are connected to the
boiler's T-T terminals, have been shorted and the boiler is beginning its firing
sequence.
INST PURG
Boiler is active while the AQ252 is conducting the PURGE operation in the Installer
Setup.
INSTALL
Boiler is in ready mode during Installer Setup.
PMP EXER
Boiler is disabled while the AQ252 is exercising all pumps and valves connected to
the AQUATROL network.
POST PURG
Boiler is active with Post Purge operation and is sending the purged water to the
Boiler (Primary) loop.
PURGE DHW Boiler is active with Post Purge operation and is sending the purged water to the
DHW tank.
CALL FOR COOL
n/a
At least one zone with a programmable thermostat requires cooling.
CALL FOR DHW
n/a
The DHW requires heat.
CALL FOR HEAT
n/a
At least one zone requires heat.
CWSD ACTIVE
n/a
Zone calls for cooling are not served because CWSD (Cold Weather Shutdown) is in
progress.
DHW DISABLE
n/a
DHW call is not served because it is disabled.
INJECTION%: xx%
n/a
The variable speed injection pump terminals are active and operating at xx% of full
speed.
