SDI-JC-22D2 rev. 11-1-21 page 3 of 22
Operation
Home Screen
The current boiler outlet draft pressure is displayed at the top in the selected engineering units:
“wc, cm wc, mm wc, or kPa. The Bargraph height varies in proportion to the measured draft.
The line on the right side of the bargraph is the high draft pressure alarm setpoint.
The triangle on the right is the draft control Setpoint.
The Auto/Manual button allows for manual control of the draft damper when the boiler is in
standby or released to modulate.
Press either the left or right arrow to display the large font alternate home screen.
Alarms
The lower left button on all screens indicates one of these three words:
Silence or Alarms or History
When a new Alarm occurs, Silence and the bargraph blink, and the Alarm Relay energizes.
Touch Silence to stop the blinking and to de-energize the Alarm Relay.
Alarms is displayed after silencing (if an Alarm is still active).
History is displayed when there are no active Alarms.
Active Alarms Screen
From any other screen, touch the Alarms button to display the Active Alarms Screen.
If there are no active Alarms, Alarms will not be displayed on the Home or Menu screens.
All active Alarms are displayed on this screen: High Draft Pressure Alarm, Configuration Errors,
Hardware Faults, etc….
The draft pressure and time/date shown occurred when the Alarm time delay expired and the
Alarm triggered.
When the Alarms screen is displayed, History and Home are displayed.
Touch History to display the History screen.
Touch Home return to the Home screen.
History
Touch History to display the History screen.
The History screen displays the Time/Date of the most recent 50 Alarms and Events.
Events include: when an Alarm Clears, a Shutdown Reset, JC-22D2 power-up, etc..
Touch the Up or Down arrow to advance to the next page of History. Touch Date to enter a
time/date and then to jump to the nearest History records.
The Hide Events and Show Events removes or displays Events.
The History memory is retained when powered down. The History can be extracted via the USB
port using the free JC_Edit Windows App.
Menu Screens
To set clock, Alarm Setpoints, and other initial Setup…..See pages 12-15
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