User ManualTable of ContentsTable of Contents2Introduction3Qualifications - Qualified Service Agent3Service Warning3Important Service Reminder3Instruction Manual4Tools Required4Installation Considerations5Instruction Manual5Closed Water Systems5Thermal Expansion5Air Requirements6Contaminated Air6Venting7Maximum Equivalent Length Requirements7Pipe Size Requirements8Maximum Elbow Requirements8Table 1 - Venting8Service Notes - Venting8Electrical Requirements9Service Notes - Electrical9Operation & Service10How It Works10Blower11Service Notes - Blower11Burner12Service Notes - Burner (Flame Sensor)12Burner & Blower Removal13Burner/Blower Removal (cont)14Service Notes - Blower Flange & Blower Adapter Gaskets.14Venturi15Gas Valve16Gas Valve Removal16Gas Pressure Testing17Service Notes - Checking Gas Pressures17Gas Pressure Readings18Service Notes - Gas Pressure Adjustment18Table 2 - Gas Pressure Requirements18Air Pressure Switches - Construction19Air Pressure Switches - Location20Air Pressure Switch Operation21Air Pressure Switch Testing22Normal State Test22Operational State Test22Pressure Test23Table 3 - Air Pressure Switch Parameters23Air Pressure Switch Testing - Pressure Readings24Flame Sensing Test25Measuring Flame Sensing Current25Igniter Current Test26Service Notes - Hot Surface Igniters26Control System27Introduction27Control System Features27UIM28Service Notes - Button Pad Ribbon Cable28Commercial & Residential Product Differences29Discreet Menu - Contact Information29Desktop Screen30Service Note - Sequence of Operation Display30Table 4 - Status Icons31Table 5 - Operational States (Modes)32Operating Set Point Adjustment33Control System Menus34Control System Menus (cont)35CCB36Service Notes - CCB Replacement36Socket Identification37J1 Socket - Transformer38J2 Socket - 120 VAC To Blower38J3 Socket - 120 VAC Power Supply38J4 Flame Sensor - Male Spade Connector38J5 Socket - Igniter 120 VAC HSI (hot surface igniter - Silicon Carbide)38J6 Socket - Gas Valve, Pressure Switches, Enable/Disable Circuit38J7 Socket - Temperature Probe/ECO (immersion probe - top of the water heater)39J9 Port - Communication Port - Not Used39J10 Socket - Not Used39J11 Port - Communication Port - Not Used39J13 Socket - Blower Speed Control (VFD)39J15 Socket - Not Used39J16 Port - Communication Port - UIM Display (user interface module)39S1 Dip Switch39Wiring Diagram40Service Notes - Polarity & Ground40Sequence Of Operation41Troubleshooting42Rough Starting - Rough Operation Note:42Heater Status Menu42Things to check before servicing42Resetting the control system42Important Service Reminder42UIM Is Blank43UIM Is Inoperable43Fault Messages - Lock Outs44AC Reversed44Upper Probe Open44Upper Probe Short45Flame Probe Short45Flame Detect Error46Energy Cut Out (ECO)46Blocked Inlet47Blocked Exhaust Vent48Blower Prover Failure48Blower Prover Open (blower is not running)49Blower Prover Open (blower is running)49Low Igniter Current50Ignition Failure51Gas Valve Failure53Communication Failure53Size: 2 MBPages: 54Language: EnglishOpen manual