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22. Section B operation continues until the analog input
signal to the SC30SM2A control drops below 4.8 VDC. At
this point the SC30SM-2A R2 relay opens (Red R2 LED
OFF). Section B switches OFF.
23. Modulation will continue on the modulating Section A for
analog input voltages from 4.8 down to .0.5 VDC.
24. When the thermostat (temperature controller) is
satisfied and the demand for heat ends, the heat enable
(thermostat) contact opens, power is removed from the
Tstat terminal on Section A IC and the combination gas
valve is de-energized immediately and a 30 second
post-purge occurs (at high speed) before de-energizing
the ID Fan.
Ignition Control Operational Features
Ignition and Operational failures during a call for heat result in
"lockout" of the ignition control.
1. If flame is lost during an operational cycle, the ignition
control will respond within 0.8 seconds. The spark will
be energized for a trial for ignition period to attempt to
relight burners and prove flame sensor. If flame is re-
established, normal operation resumes
2. If the burners fail to light or carryover during a trial for
ignition, the control will attempt two additional ignition
trials. If no flame is present at the flame sensor within 10
seconds, the spark and gas valve will be de-energized. A
15 second interpurge period begins and the combustion
blower continues to run. After the inter-purge period
another ignition trial will take place.
3. If burner fails to light or prove the flame sensor following
the two additional trials the control will go into lockout.
The valve relay in the IC will be de-energized shutting
of the gas valve immediately and the induced draft fan
following a 30 second post-purge.
IM 777-18 • SKYLINE OUTDOOR AIR HANDLER
Recovery from Lockout
1. If the thermostat (controller) is still calling for heat one
hour after a lockout occurs, the control will automatically
reset and initiate a call for heat sequence.
2. The ignition control may also be manually reset,
removing power (24V) to IC terminal 24VAC for 5
seconds then restoring power.
Capable Controls Status Indicator LED
LED Indications, Normal Operation
• Green, ½ sec ON, ½ sec OFF: Pre-purge, Inter-purge,
Post-purge
• Green, blinking rapidly: Trial for ignition
• Green, on solid: Flame detected, pilot/main burners ON
ERROR CODES - Red Flashes Error Definition Error Type
• 1 flash, then pause - No flame in trial time Lockout
• 2 flashes, then pause - Flame sense stuck on Lockout
• 3 flashes, then pause - Pilot/Main relay failure Lockout
• 4 flashes, then pause - Repetitive flame loss error Lockout
• 5 flashes, then pause - Rollout error Lockout
• 6 flashes, then pause - APS Airflow error Lockout
• 7 flashes, then pause - Internal control error Lockout ON
Solid Red - Line Voltage/Frequency Error Standby
52
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