Sequence Of Operation - Alto-Shaam 6-10ML Service Maintenance Manual

C O M B I T H E R M

1.21 SEQUENCE OF OPERATION

Honeywell SmartValve
Start
Apply 24 VAC
to Appliance
Calls for Heat
Flame Signal
Internal Check
• Pilot Valve Opens
Trial for
• Igniter Powered
Ignition
Pilot Lights and Flame
is sensed during
Trial for Ignition?
Main
Burner • Main Valve Opens
Operation
Electronic Fan
Timer (EFT)
Output Energizes
Flame Signal Lost?
Thermostat Call for
• Main and Pilot Valves Close
• EFT Output De-energizes
End
1
System
™
Thermostat
• Pilot Valve/Ignition Off
YES
Detected! • Wait for Flame Signal to Disappear
NO
NO
Okay?
NO
YES
1
• Igniter Off
YES
NO
Heat Ends
Igniter will turn off about 30 seconds into the trial for ignition if the pilot flame has not lit. It will turn
back on for the final 30 seconds of the 90 second trial for ignition. The pilot valve will be energized
during the entire trial for ignition. This is normal operation for this gas ignition system.
C O M B I T H E R M G A S I N S TA L L AT I O N A N D M A I N T E N A N C E M A N UA L
G A S I N S TA L L AT I O N
®
Three Second Flame Failure
• Pilot Valve Closes
• Igniter Off
• Main and Pilot Valves Close
• EFT Output De-energizes
NO
Flame Lost More than Five
Times in One Call for Heat?
YES
Five Minute Retry Delay
Recycle Delay
— 6 4 7 0
M L
. 1 1
P G