Crown Boiler PHNTM080 - Page 105

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2) Current Priority Screen:
a) Current Demand - The demand to which the boiler is currently responding. If more than one demand is present, it is the
onehavingthehighestpriority.Seeabovedescriptionsunder“HomeScreen”forspecictypesofCurrentDemands.
b) Setpoint - The temperature that the boiler is currently trying to achieve.
c) Supply (or Header) Temperature - The actual water temperature at the current setpoint location (either the boiler
supplyorheader,dependingonthedemandandwhatsetpointlocationwasselectedintheCongurationMenu).
d) Setpoint Source - Should always read “Local S.P.” in the applications covered by this manual.
3) Boiler Temperatures Screen:
a) Supply - Current water temperature at boiler supply sensor.
b) Return - Current water temperature at boiler return sensor.
c) Stack-Currentuegastemperaturenearboilerventconnection.
d) Header - Current header sensor temperature. This temperature will only be visible if the header was selected as the
setpointlocationintheCongurationMenu.
4) Burner Status Screen:
a) Burner Status - Indicates what the burner system is currently doing. Typical Burner Status include:
• Standby - Burner is not needed because there is no call for heat or the target temperature has been reached.
• Standby Delay - Burner is needed, but is being temporarily held off (generally due to a soft lockout - see
Diagnostics section).
• Safe Start-up-Controlischeckingamecircuitbeforeinitiatingignitionsequence.
• Drive Purge - Waiting for blower to reach pre-purge speed.
• Prepurge-Allowingtheblowertoclearanyresidualgas/uegasfromthecombustionchamber(10s).
• Drive Light-off - Waiting for blower to prove that it is at the proper ignition fan speed.
• Pre-ignition test - Test the safety relay and verify that downstream contacts are off.
• Pre-ignition-Energizeignitorwithgasvalveofftomakesurethatthereisno“falseame”signal.
• Direct ignition-Withtheignitorenergized,openthegasvalveandcheckforthepresenceofaame.Nominaltrial
for ignition period is 4s.
• Running-Burnerisring.
• Post-Purge - Blower is running after the burner shuts off to clear the combustion chamber of residual gasses. Post
purge time is 30s.
• Lockout - Boiler is in a hard lockout (see Diagnostic Section).
b) Active Fault(visibleonlywhenthereisaproblem)-Reverseashestoindicateaproblemwiththeboilerorthesystem.
Touching this indicator takes the user to the Diagnostic Menu. See Section XIV for more information.
c) Hold Delay (Visible only during soft lockout) - Indicates remaining time before next ignition sequence.
d) Flame Signal-IndicatesthestrengthoftheamesignalinDCmicro-amps.