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Installation & Operation Manual
7 Operating information (continued)
Status Display Screens
By using the Previous/Next (, ) arrow keys on the SMART SYSTEM display panel, you can navigate through the 11 display
screens. Each screen will contain two (2) viewable items. The following is a description of the individual items and what they
can display:
Screen # Display Shows Description
Screen #1
Line 1
HTR: OFF
The unit has been turned OFF by the Enter/Reset button on the
SMART SYSTEM display panel.
HTR: STAND-BY
The unit’s water temperature set point has been met and there is
no call for heat demand being received from either the external
thermostat or the BMS.
HTR: SETPOINT MET
The unit’s water temperature set point has been met, but is still
receiving a call for heat from either a remote thermostat or a BMS.
HTR: PRE-PURGE
The unit has initiated the combustion air purge cycle upon a call for
heat.
HTR: IGNITER * ON
The unit has begun the igniter heatup cycle prior to the trial for
ignition. Display will show IGNITER A or IGNITER B depending on
which stage has priority.
HTR: RUN STG ****
The unit has fired and is running at the displayed number of stages
(1,2,3,4).
HTR: POST-PURGE
The call for heat has been satisfied and the unit runs the fan to clear
the combustion chamber and vent system of residual flue products.
HTR: SERVICE MODE
The unit has been placed in a temporary mode that will allow the unit
to fire for the purpose of combustion analysis.
Screen #1
Line 2
OUT: ***F The outlet temperature is displayed by the control.
OUT: OPEN The control does not detect the outlet sensor.
OUT: SHORTED The outlet sensor wires or the sensor itself has become shorted.
Press the Next arrow key on the SMART SYSTEM display to access Screen #2.
Screen #2
Line 1
INLET: ***F The inlet temperature is displayed by the control.
INLET: OPEN The control does not detect the inlet sensor.
INLET: SHORTED The inlet sensor wires or the sensor itself has become shorted.
Screen #2
Line 2
RISE: ***F
The difference between the inlet temperature and the outlet temperature
is displayed.
Press the Next arrow key on the SMART SYSTEM display to access Screen #3.
Screen #3
Line 1
SYSSUP: ***F The system supply temperature is displayed by the control.
SYSSUP: OPEN The control does not detect the system supply sensor.
SYSSUP: SHORTED The system supply sensor wires or the sensor itself has become shorted.
Status display screens