Table of Contents
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INTRODUCTION ....................................................................................3
Qualifications .....................................................................................3
Service Warning ................................................................................3
Service Reminder ..............................................................................3
Tools Recommended .........................................................................3
INSTALLATION CONSIDERATIONS .....................................................4
Instruction Manual .............................................................................4
Closed Water Systems ......................................................................4
Thermal Expansion ............................................................................4
Air Requirements ...............................................................................4
Contaminated Air ...............................................................................4
FEATURES AND COMPONENTS .........................................................5
Combustion Blower & Burner Assembly ............................................5
Top View: SUF 60120 - 100250 Models ............................................6
Top View: SUF 119300 - 119500 Models ...........................................6
SEQUENCE OF OPERATION FLOW CHART .......................................7
FAULT AND ALERT CODES ..................................................................8
1. Low Gas Pressure .........................................................................8
High Altitude ................................................................................8
Gas Pressure Specifications .......................................................8
Gas Supply Systems ...................................................................9
Supply Gas Regulator .................................................................9
Gas Pressure Test .....................................................................10
Pressure Switches ....................................................................12
Control System Monitoring ........................................................12
Pressure Switch Tests ...............................................................13
Continuity Test During Standby .................................................13
Continuity Test During Operation ..............................................14
Pressure Test During Operation ................................................14
Pressure Switch Settings ..........................................................15
2. Ignition Failure .............................................................................16
3. Blocked Air Intake ........................................................................19
4. Blocked Exhaust ..........................................................................20
5. Flame Sensor Error .....................................................................21
Gas Control Valve .....................................................................21
Gas Control Valve Voltage Tests ...............................................22
Flame Sensor ............................................................................23
Flame Sensing Operation .........................................................23
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TABLE OF CONTENTS
Servicing should only be performed by a Qualified Service Technician
Flame Sensing Current Test ......................................................24
6. No Water ......................................................................................25
Powered Anodes .......................................................................25
Power Anode Cleaning and Removal .......................................25
7. Anode Shorted .............................................................................27
8. Temperature Probe Short (Upper or Lower) ................................28
Temperature Probe ...................................................................28
Temperature Sensor Test ..........................................................29
ECO Continuity Test ..................................................................29
9. Temperature Probe Open (Upper or Lower) ................................31
VENTING ..............................................................................................32
General Venting Information .....................................................32
INTAKE AIR CONNECTION .................................................................33
ELECTRICAL CONNECTIONS - ALL MODELS ..................................34
Electrical Wiring ...............................................................................34
Power Supply Connections .............................................................34
Enable/ Disable Switch ....................................................................35
Power Supply Test ...........................................................................35
INSTALLATION CHECK LIST ..............................................................36
OPERATION AND SERVICE ...............................................................37
How It Works ...................................................................................37
Combustion Blower .........................................................................37
Modulation .......................................................................................37
CONDENSATE PREVENTION ALGORITHM .................................37
BLOWER SPEED CONTROL ..............................................................39
BURNER ASSEMBLY ..........................................................................40
INSTRUCTIONS ...................................................................................41
SPARK IGNITER ..................................................................................42
GAS ORIFICE - SUF 119300 - 119500 MODELS ................................44
Orifice Chart - SUF 119300 - 119500 Models ..................................44
CCB (CENTRAL CONTROL BOARD) ..................................................45
CCB Cover Removal And Replacement ..........................................46
CCB Circuit Board Layout ...............................................................47
CCB Connection Identification .........................................................48
WIRING DIAGRAM - SUF 60120 - 119500 .........................................50
CONTROL OVERVIEW ........................................................................51
ICOMM .................................................................................................52
NOTES .................................................................................................53
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