SERVICE HANDBOOK

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ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - <strong>SERVICE</strong> MANUALWIRING DIAGRAM120 VAC 1ØPower SupplyGroundNeutralHotService Notes - Polarity & GroundThis water heater is polarity and ground sensitive. The control system will lock out anddisplay a fault message (“AC Reversed”) if the power supply polarity is reversed. Flamesensing current cannot be established if the burner is not grounded which will lead to ignitionfailure. See electrical requirements on page 8.Technical Literature Department 39 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> MANUALSEQUENCE OF OPERATIONCall for heat initiatedAir Pressure Switch Test Is PerformedBlower Prover Switch is verified openBlocked Intake and Blocked Exhaust Switches are verified closedYESBlower Motor is energizedPre-purge StateBlower Prover Switch is verified closedYESIgniter is energized for warm up period(approx 17 seconds)NONOControl System DeclaresFault Condition - Locks OutOne of the followingFault Messages Displayed:“Blower Prover Failure”“Blocked Inlet”“Blocked Exhaust Vent”Control System DeclaresFault Condition - Locks Out“Blower Prover Open”Fault Message DisplayedControl System (CCB) Verifies IgniterCurrent at 2.0 AC Amps MinimumYESNOControl System DeclaresFault Condition - Locks Out“Low Igniter Current”Fault Message DisplayedGas Valve Is EnergizedGas Flows To BurnerControl System (CCB) Verifies FlameSensing Current at 1.0μA DC Micro Amps MinimumYESNOWater Is Heated ToOperating Set PointGas Valve IsDe-energizedGas Valve IsDe-energizedInter-Purge State30 Sec ApproxPost-Purge State30 Sec ApproxRetries Up To3 TimesControl System Goes IntoStandby State/ModeControl System DeclaresFault Condition - Locks Out“Ignition Failure”Fault Message DisplayedTechnical Literature Department 40 of 52 Ashland City, TN © 2008Servicing should only be performed by a Qualified Service Agent
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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 32 and 33: 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

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