SERVICE HANDBOOK

More documents

Recommendations

Info

UIM (CONT)ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - <strong>SERVICE</strong> MANUALTable 5 - Operational States (Modes)STATEStandbyInput VerificationPre-PurgeIgniter WarmupIgnition ActivationIgnition VerificationInter-PurgeHeatingPost-PurgeFaultDESCRIPTIONThe water heater is not in an active heating cycle. This usually means the temperaturein the tank has reached Operating Set Point and has not dropped low enough to initiatea call for heat.The control system is waiting for specific conditions to occur (primarily pressure switchnormal state verification - see page 20) before the unit can continue in the Sequence ofOperation.The blower has been energized - the control system is purging out any excess gas orleft over products of combustion from the heat exchanger at the beginning of eachheating cycle.The igniter has been energized and is currently warming up to ensure proper ignition -typically last 17-20 seconds.The control system is allowing for a steady burner flame to be established. Duration ofthis and the Ignition Verification state is typically 4-6 seconds.Assurance of proper flame sense is being determined.After a failed trial for ignition the control system is purging out any excess gas or leftover products of combustion from the heat exchanger before another trail for ignition.Burner flame has been properly established - minimum flame sensing current hasbeen verified by the control system - water in the tank is being heated.The control system is purging out any excess gas or left over products of combustionfrom the heat exchanger after a successful heating cycle.The control system has detected a fault and declared a fault condition. The controlsystem is locked out. A fault message is displayed on the UIM (page 27). The problemthat caused the lock out must be corrected before the water heater can resume aheating cycle.Technical Literature Department 31 of 52 Ashland City, TN © 2008Servicing should only be performed by a Qualified Service Agent
ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - <strong>SERVICE</strong> MANUALOPERATING SET POINT ADJUSTMENTWhen the temperature sensed by the control system at the Temperature Probe (top of thewater heater) reaches the Operating Set Point the control system will end the heating cycle.A call for heat will be activated again when the tank temperature drops below the OperatingSet Point minus the Differential setting plus one degree.Example: Operating Set Point is 120°, Differential setting is 2° (factory default). A call forheat will be activated when tank temperature drops to 117°. 120 - (2+1) = 117.The Operating Set Point and the Differential setting is adjusted or changed in theTemperatures menu. The following illustrations and instructions will explain how to adjustthese user settings and navigate the control system menus.ACTIONFrom the desktop screen, press MENU.DISPLAYNOTE: Notice how the text on the UIM display above theOperational Buttons changes as you navigate throughthe various menus and screens.With Temperatures selected (highlighted in black) in theMain Menu, press the Operational Button underneath“SELECT” to enter the Temperatures Menu.If Temperatures is not selected use the Up and Downbuttons to select this menu item.With the Operating Set Point selected in theTemperatures Menu, press the Operational Buttonunderneath “CHANGE” to activate the adjustment modefor this menu item.NOTE: The Upper Probe Offset can be used to overridethe control system’s calculated tank temperature by 5°above or below current reading. Adjustable range is -5°Fto +5°F.Press the UP and DOWN buttons to adjust the OperatingSet Point to the desired setting.Press the Operational Button underneath “UPDATE” toconfirm the new setting or “CANCEL” to discard the newsetting and retain the previous setting.NOTE: This same procedure can also be used to adjustthe Differential and the Upper Probe Offset user settings.Technical Literature Department 32 of 52 Ashland City, TN © 2008Servicing should only be performed by a Qualified Service Agent
Page 4 and 5: ULTRA HIGH EFFICIENCY POWER VENT/PO
Page 12 and 13: BURNERULTRA HIGH EFFICIENCY POWER V
Page 16 and 17: GAS VALVEULTRA HIGH EFFICIENCY POWE
Page 28 and 29: UIMULTRA HIGH EFFICIENCY POWER VENT
Page 30 and 31: UIM (CONT)ULTRA HIGH EFFICIENCY POW
Page 36 and 37: CCBULTRA HIGH EFFICIENCY POWER VENT
Page 38 and 39: CCB (CONT)ULTRA HIGH EFFICIENCY POW
Page 54: 500 Tennessee Waltz ParkwayAshland

SERVICE HANDBOOK

Create successful ePaper yourself

Delete template?

Save as template?