Daikin DPS005 Installation And Maintenance Manual

Also see for DPS003: Installation and maintenance manual Manual

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Daikin DPS005 Installation And Maintenance Manual Manual pdf 54 page image

DPS 003–015 (only) Gas Furnace Ignition and Control TroubleshootingVariable Furnace ControllerDaikin’s furnace controller is an electronic device that deliversfull control of the modulating furnace. Control includessequencing, ignition, safety, modulation of the control valve,and the induced draft motor. Inputs to the furnace control boardare an a 0-10V signal. The analog signal will modulate theburner down to 25% of full load. Safety inputs include pressureline and electrical connection from the airflow proofing switchand electrical connection from the rollout switches. Controlboard outputs are to the igniter board, modulating gas valve,and to the induce draft motor.VB-1200 Trouble Shooting GuideModulating Furnace DiagnosticsThe Rebel furnace control that operates the furnace hasbuilt-in, self-diagnostic capability. The control continuouslymonitors its own operation and the operation of the system.The LED on the control indicates the current system state,warnings, failures and test modes.Table 22: Furnace I.D. Plug Information (Displayed on Power-up)Display Information (example) DescriptionC Furnace series or model name, for example, C cabinet series.CAb400 Furnace size in 1000’s of BTU, for example, 400 kBTU.nAt or LP Burner fuel type, for example, natural gas or LP.6AS or LP1.01 Software version, for example, v1.01Table 23: Normal Furnace OperationDisplay Information Mode DescriptionOff OFF Mode System Idle - Control board has power, no faults found, no call for heat.PVr PURGE Mode System is purging the heat exchanger – No gas on, no flame, inducer runs for the specified purgetimings. Purge cycles occur immediately before and after each burner operation.I9n IGNITION Mode System is initiating burner operation – Igniter energized, modulating valve moved to ignition setting, gason. Maintained for the trial-for-ignition period and the five second flame stabilization period.HEA WARM-UP Mode Period between Ignition and Run – System checks completed before modulation control begins.rVn RUN Mode Normal modulating operation.rEt Ignition Retry System has had a failed ignition attempt or has lost flame during burner operation and is beginninganother ignition cycle.IM 1125-7 • REBEL ROOFTOPS 54 www.DaikinApplied.comopTIonal gas heaT