18
CONTROL OPERATION
Boiler Fault Codes
• Freeze Protection
If the water temperature falls below 45°F (7°C) the
control will automatically initiate a heat call sequence
RW (TT) until the water temperature reaches 55°F
(13°C). Boiler must be in ON mode for freeze protection
to occur.
• Relay Failure Alarm
If a heating element relay fails the control shall switch
off all heating elements and energize the pump. The
audible alarm shall sound and the relay designator,” r1”,”
r2”, “r3”, “r4” shall be displayed until the error clears
and the power is reset.
• Temperature Sensor Failure
The water temperature sensor shall be monitored at all
times, (on and off modes). If the sensor is open “tSO”
shall be displayed. If the sensor is shorted “tSS” shall
be displayed. In both cases the control shall switch off
all heating elements. The audible alarm shall sound for
a minimum of 30s and until the error clears and the unit
is reset with the MODE/PWR button or disconnecting the
main power.
• Abnormal Power Alarm
The incoming power shall be monitored at all times, (on
and off modes). If the power to the control falls outside
the range of 18Vac - 30Vac the control shall switch off
all appliances. The audible alarm shall sound and “AbP”
shall be displayed for a minimum of 30 seconds and
until the error clears.
• Flow Alarm
The ow alarm shall only be monitored during
the heating cycle while elements are energized or
attempting to be energized. An open ow switch shall
have no effect while heating elements are off.
If ow switch opens while elements are energized or
attempting to be energized, control shall switch off all
elements and enter 60 second purge mode. The audible
alarm shall sound and “FLO” shall be displayed for
minimum of 30 seconds and until error clears or demand
for heat ceases. Pump shall remain on for minimum of
30 seconds after fault clears.
• Low Water Cutoff Alarm
The Low Water Cutoff alarm shall only be monitored
during the heating cycle while elements are energized or
attempting to be energized. An open Low Water Cutoff
shall have no effect while heating elements are off.
If Low Water Cutoff opens while elements are energized
or attempting to be energized, control shall switch off all
elements and enter 60 second purge mode. The audible
alarms sound and “LCO” is displayed for minimum of 30
seconds and until the error clears or demand for heat
ceases. The pump shall remain on for minimum of 30
seconds after fault clears.
• High Limit Alarm
The high limit alarm shall be monitored at all times
except while the LMC terminals are open.
If the High Limit switch opens the control shall switch
off all elements and enter a 60 second purge mode. The
audible alarm shall sound and “HL” shall be displayed for
a minimum of 30 seconds and until the error clears. The
pump shall remain on for a minimum of 30 seconds after
the fault clears.
• Control Hardware Failure
Control hardware monitoring system is active while
control is on. If control hardware failure is detected the
control shall switch off all appliances. The audible alarm
shall sound and “CHF” is displayed for minimum of 30
seconds and until error clears.
• Test Mode
Test mode is intended for installer verication of AT
Boiler control. It is used to reduce time required to
conduct comprehensive function test of the unit.
Initiation of test mode can be accessed through the user
interface and is not intended for unauthorized personal.
To enter test mode unit must energized and in OFF
mode. Press and hold ▲up arrow button for 4 seconds.
The rmware version is displayed for 3 seconds then
element conguration (“2” or” 4”) is displayed.
Pressing either ▲up or ▼down arrow buttons change the
element conguration (2 or 4). Select conguration that
coincides with boiler.
Press MODE/PWR button, display will illuminate all
segments 8.8.8 along with demand LED (TT).
Pressing MODE/PWR button again,” tSt” is displayed.
Check is made of Flow Sensor circuit, Low water cutoff
sensor circuit, High limit circuit, Load management
circuit and water temperature sensor. If any circuit is
open or temperature sensor is shorted the display will
indicate an error code (FLO, LCO, HL, LdC, tSO, tSS)
and audible alarm will sound.
Pressing MODE/PWR button again enters element check
sequence. Each element heating circuit is checked for
power. If the element does not have power error is
displayed (“r1”, “r2”, “r3”, “r4”) and audible alarm will
sound.
When test is completed “dOn” is displayed.
Pressing MODE/PWR button will repeat the test.
Pressing ▲up arrow button exits test mode and returns
to off mode. Control automatically exits test after 4m.
Removing power exits test mode.
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