PH
-SERIES
42
18.0
SEQUENCE OPERATION
18.1
DESCRIPTION OF 3-TRY DIRECT SPARK IGNITION SYSTEM:
The TRITON 2461D is a 24 VAC Microprocessor Based Direct Spark Ignition Control designed for use in all types
of heating applications such as gas furnaces, boilers, water heaters and other similar appliances: The control
utilizes a microprocessor to continually and safely monitor, analyze and control the proper operation of the
gas burner. Value added features such
as:
combustion blower control, LED diagnostics, automatic one hour
reset, and flame current test pins highlight the controls benefits.
18.2
OPERATION:
POWER UP/STANDBY
•
Upon applying power (24 volts) to 24 VAC/R, the control will reset, perform a self-check routine,
initiate fulltime flame sensing, flash the diagnostic LED for up to four seconds, and enter the
thermostat scan state.
HEAT MODE
•
When a call for heat is received from the thermostat supplying 24 volts to TH/W, the control will
check the pressure switch for normally open contacts. The combustion blower is then energized and
once the pressure switch contacts close, a pre-purge delay begins. Following the pre-purge period
the gas valve is energized and sparks commence for the trial for ignition period.
•
When flame is detected during the trial for ignition, sparks are shut off immediately and the gas
valve and combustion blower remains energized. The thermostat, pressure switch, and main burner
flame are constantly monitored to assure the system continues to operate properly. When the
thermostat is satisfied and the demand for heat ends, the main valve is de-energized immediately,
the control senses the loss of flame signal and de-energizes the combustion blower.
FLAME FAILURE - RE-IGNITION
•
If the established flame signal is lost while the burner is operating, the control will respond within
0.8 seconds. The HV spark will be energized for a trial for ignition period in an attempt to re-light
the burner. If the burner does not light, the control will make two more attempts to re-light the
burner. If the burner does not re-light, the control will go into lockout and flash the LED 3-times. If
flame is re-established, normal operation resumes.
