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I-UEZ (04-21) 1034347-0
TABLE OF CONTENTS—CONTINUED
OPERATION ............................................................................. 37
Pre-Startup Checklist .....................................................................37
Startup................................................................................. 38
Startup Procedure .....................................................................38
Operating Sequences...................................................................39
Vent System Testing ...................................................................41
Post-Startup Checklist ..................................................................42
ADJUSTMENTS........................................................................... 42
Pressure Switch Replacement ..............................................................42
Measure and Adjust Manifold (Outlet) Gas Pressure .............................................43
Measure and Adjust Manifold Gas Pressure—Elevation ≤2,000 Feet (≤610 Meters) ..................43
For installations at high elevations, measure and adjust the manifold (outlet) gas pressure as follows: ....45
Converting Unit from Natural Gas to Propane...................................................46
MAINTENANCE........................................................................... 47
Service Checklist......................................................................... 47
Maintenance Procedures ..................................................................48
Burner Maintenance ....................................................................48
Burner Orifice Maintenance ..............................................................50
Heat Exchanger Maintenance ............................................................50
Ignition System Maintenance .............................................................50
Maintenance of Fan Motor, Fan Blades, and Fan Guard ........................................51
Venter Motor, Wheel, and Pressure Sensing Tap Maintenance ..................................52
Operating Gas Valve Maintenance ........................................................53
Pressure Switch Maintenance ............................................................53
High Temperature Limit Control Maintenance ................................................53
Interlock Door Switch Maintenance ........................................................53
Transformer Maintenance ...............................................................53
Vent Temperature Limit Switch Maintenance.................................................54
Disconnect Switch Replacement ..........................................................54
Vent or Vent/Combustion Air System Maintenance ............................................54
Condensate Drain System ...............................................................54
TROUBLESHOOTING ......................................................................54
Unit Troubleshooting Using DSI Control Module.................................................54
General Troubleshooting................................................................... 56
INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER)................................... 60
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