IBC Technologies SL 20-115 Installation And Operating Instructions Manual
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Contents
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INSTALLATION AND OPERATION INSTRUCTIONS2-4SL 20-115 MODULATING GAS bOILERseQuenCe oF oPerationthe control module has 5 cycles during normal operation, as well as an errormode for problem detection:1. standby cycle2. Purging3. ignition cycle4. Heating cycle5. Circulating cycle6. error modeEach state is explained below. A flow chart for the sequence of operation can befound in the back of the manual.GLOSSARY OF TERMSThis glossary briefly defines some terms used in the Sequence discussion.• Call for Heat: the thermostat indicates that room temperature is below thethermostat setting.• Heat Required: temperature sensors on the boiler indicate that watertemperature is below the water temperature target or setpoint.• Heating Enabled: the boiler is powered and there is a Call for Heat, Heat isRequired. the boiler will start and enter the Heating Cycle unless it is in anerror mode.2.5.1 StandbyWaiting for a Heating Enabled signal. the burner and boiler pump are off duringthis time.2.5.2 PurgingPREPURGEon a Heating Enabled signal, the boiler automatically enters a prepurge cycle.the fan starts and automatically adjusts to a level suitable for ignition. ten secondslater, the pump starts. after a total of 15 seconds, the ignition cycle begins.INTERPURGEthe boiler enters an interpurge cycle if ignition is unsuccessful. the fan andpump continue to run, and ignition is delayed by an additional 15 seconds.POSTPURGEThe fan remains on for 20 seconds and then reduces airflow to an ultra low flowmode for 90 minutes unless preempted.2.5 |
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