SERVICE HANDBOOK

ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUALCCB (CONT)J7 Socket - Temperature Probe/ECO (immersion probe - top of the water heater)PIN #DESCRIPTION1 ECO (energy cut out) 24 VAC out (red wire)2 Upper temperature probe (thermistor) +5.0 VDC (black wire)3 Upper temperature probe (thermistor) -5.0 VDC (black wire)4 ECO (energy cut out) 24 VAC return (red wire)J9 Port - Communication Port - Not UsedJ10 Socket - Not UsedJ11 Port - Communication Port - Not UsedJ13 Socket - Blower Speed Control (VFD)PIN #DESCRIPTION1 Not used2 Not used3 To Blower low voltage PWM plug (see page 10) - pin #5 (white w/grn stripe)4 Not used5 Not used6 Not used7 To Blower low voltage PWM plug (see page 10) - pin #4 (white w/blue stripe)8 To Blower low voltage PWM plug (see page 10) - pin #1 (white w/brn stripe)J15 Socket - Not UsedJ16 Port - Communication Port - UIM Display (user interface module)S1 Dip SwitchThe S1 dip switches are configured from the factory and should not be changed. Theillustration below shows the 4 dip switches with labeling. Dip switches are toggle type microswitches. Flipping a dip switch towards “Open” would be the same as “Off.” Flipping a dipswitch the other way (towards the switch numbers) is the same as “On.”Dip switch #1 is used to configure the water heater to declare a fault condition and lock outafter one or three failed trials for ignition. The factory setting is “on” for three trials.Dip switches #2 and #3 are used when this control system is installed on other products.The factory setting for these two dip switches is “on.”Dip switch #4 is a spare, configuration does not matter.OFFOPENExtInput1 RetryUse YesType TstatSpareOPEN1 2 3 43RetriesNoVentSpareONCLOSEDTechnical Literature Department 38 of 52 Ashland City, TN © 2008Servicing should only be performed by a Qualified Service Agent