8
2.4
STATUS DISPLAY SCREENS
Status Display Screens
By using the Previous/Next (◄, ►) arrow keys on the user interface control panel, you can navigate through the six (6) 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
1
WHR: OFF
The unit has been turned OFF by the Enter/Reset button on the user
interface control panel.
STANDBY
The unit has not received a call for heat from its from a tank sensor.
PREPURGE
The unit has initiated a 10 second purge period on a call for heat.
IGNITION
The unit has begun a 5 second spark period to ignite the main burner.
RUN***% RATE
The unit has fired and is running at the displayed percentage.
POSTPURGE
The call for heat has been satisfied and the unit runs the fan for an
additional 10 seconds to clear the combustion chamber and flue system
of residual combustion products.
SERVICE
The unit has been placed in a temporary mode that will allow the unit to
fire at 100% of rate for the purpose of combustion analysis.
OUT:***.*C
The heat exchanger outlet temperature is displayed.
OPEN
The control does not detect the outlet sensor.
SHORTED
The outlet sensor wires or the sensor itself has become shorted.
Press the Next ► arrow key on the user control interface panel to access Screen 2
2
IN: ***.*C
The heat exchanger inlet temperature is displayed.
OPEN
The control does not detect the inlet sensor
SHORTED
The inlet sensor wires or the sensor itself has become shorted.
RISE: ***.*C
The difference between the inlet temperature and the outlet
temperature.
Press the Next ► arrow key on the user control interface panel to access Screen 3.
3
FLUE: ***.*C
The control will display the flue temperature.
OPEN
The control does not detect the flue sensor.
SHORTED
The flue sensor wires or the sensor itself has become grounded.
TANK: ***.*C (***)
The control will display the stored water temperature; the set point
appears in brackets.
OPEN
The control does not detect the tank sensor.
SHORTED
The tank sensor wires or the sensor itself has become shorted.
Press the Next ► arrow key on the user control interface panel to access Screen 4.
4
FAN SPD: ****RPM
The control will display the actual fan motor RPM.
FLAME SIG: **.*UA
The control will display the flame signal in dc micro amps.
Press the Next ► arrow key on the user control interface panel to access Screen 5.
5
WHR CFH: OFF
The control has not received a call for heat from the tank sensor.
ON
The control has received a call for heat from the tank sensor.
WHR PUMP: OFF
The control has not received a DHW call for heat and has not powered
the primary pump.
ON
The control has received a DHW call for heat and has powered the
primary pump.
DELAY
The primary call for heat has been satisfied and the DHW pump is
running for a fixed time to remove any residual heat.
Press the Next ► arrow key on the user control interface panel to access Screen 6.
6
NOT USED: N/A
Not used.
0-10V IN: **.VDC
The control will display a 0-10Vdc signal received from a Building
Management System (BMS) connected to the unit.
Press the Next ► arrow key on the user control interface panel to access Screen 7.
7
PMP: Off
The Master control has not received a call for heat from the tank sensor
and has not powered the primary pump.
PMP: On
The Master control has received a call for heat from the tank sensor and
has powered the system pump.
PMP: Delay
The tank call for heat has been satisfied and the tank pump is running
for a fixed time to remove any residual heat.
Press the Next ► arrow key on the User control interface panel to roll back to Screen 1. At any point if you wish to
access an earlier screen, press the Previous ◄ arrow key on the User control interface panel.
