IBC Technologies SL 20-115 Installation And Operating Instructions Manual
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INSTALLATION AND OPERATION INSTRUCTIONS2-6SL 20-115 MODULATING GAS bOILERuntil the loop drops ½ the differential below the new load target temperature.note: if there is no place to sink heat during such Circ. mode, this phase willcontinue indefinitely, affecting heat delivery.thermal shock avoidance is key. Wherever two or more loads are used, andsettings could permit supply temperature differences greater than 20°F, external3-way motorized or injection mixing is recommended.a thermal shock avoidance routine is employed to avoid undesirable effects oflarge temperature swings: the hot load pump remains on until the boiler’s returnwater sensor detects temperature stability - to sink excess heat. For example,upon satisfaction of a dHW call the dHW load pump will remain running until theboiler return water temperature falls to the dHW tank target temperature. thisdeposits legacy heat from the primary loop into the water tank before activationof a cooler load.always ensure that loads sensitive to high temperatures are protected usingappropriate means - e.g. a three way mixing valve set to restrict entering watertemperature to 130°F.2.5.6 - Error Modethe controller continually checks sensors to see that they are operating withinnormal parameters. if sensors indicate the boiler is operating outside it limits, itwill declare an error condition.two types of error conditions can occur:• Soft Errors: result when an abnormal condition exists which does not presentan immediate safety hazard. the boiler enters an extended purge, followedby the error cycle of 5 minutes for all conditions other than Maximum ignitionTrials (a modified Hard Error which locks out for 1 hour after 3 unsuccessfulignition attempts). Following the purge, the fan and pump are stopped untilthe end of the error cycle. normal operation then resumes.• Hard Errors: result when a condition exists that may be a safety hazard.the boiler enters an extended purge then the fan and pump are stopped.the boiler is in a lockout, and must be checked and restarted by a servicetechnician.With software versions 3.10.0 and higher, the boiler offers an error status signalfeature. Please see IBC Technical Note: Boiler Status – Analog Output.See Section 5.3.1 Control Panel for a list of hard and soft errors and their likelycauses. note that other problems such as disconnected wires or defectivesensors may be the cause of the error. Always check connections and wiring first.otHer oPerating Features2.6.1 Prioritizationthe control module hosts a scheduling routine to manage the boiler’s operationwhen more than one load has been defined. Typically, loads declared as DHWreceive significant - but not absolute - priority. A time vs. differential system willallocate heat amongst each of up to 3 loads over time.Multiple heating loads - with varying temperature targets - are run sequentiallyas opposed to simultaneously (with a mixing valve). the objective is to serveeach load at the minimum possible temperature, as opposed to running hotthen mixing down – with hardware, saving the related hardware and fuel cost.The approach optimizes the low temperature combustion benefits of direct cool2.6 |
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