Service manual

DJM3.2 MANUAL
TABLE OF CONTENTS
Page
Speed Sensor Values.....................................................................................................................37
Pre-purge Light Coming On (when not supposed to)........................................................................37
Constant Purge Light, No Ignition Attempt .................................................................................37
Failed Operation or Solid State Control Contacts by Others ....................................................37
S/A Fan Off Before Room Satisfied in Night Heat Mode ............................................................37
Resolution.......................................................................................................................................38
Air Balancing - Refer to next item......................................................................................................38
Discharge Temperature in Cold Weather.....................................................................................38
Ignition Problems ...........................................................................................................................38
Regulator Gas Pressure Responses............................................................................................39
Pilot Sensing Problems .................................................................................................................39
DJM3.2 Locks Up on Trial for Ignition..........................................................................................40
Rumble During Light Off................................................................................................................40
Combustion Fan Motor Surging in Speed ...................................................................................40
Modulating Valve Will Not Respond to Signal to Open..............................................................41
Improper Burning ...........................................................................................................................41
Sooting Burner/Heat Exchanger...................................................................................................41
Smell From Flue (Products of Combustion).......................................................................................41
Water and Ice From Combustion..................................................................................................42
Burner Pulsing, Backfiring, Exploding, Noisy.............................................................................42
Fire Without Combustion Fan.......................................................................................................42
Replacement of Combustion Fan Motors....................................................................................42
Set Up When Replacing DJM3.2 in Field......................................................................................42
Side Wall Venting ...........................................................................................................................43
Main Gas Valve Over Travel Switch (Option)................................................................................43
Simulating a Heat Call....................................................................................................................43
XXIV. MISCELLANEOUS NOTES................................................................................. 43
Combustion Blower Speeds..........................................................................................................43
Maxitrol Modulating Gas Valve Voltages .....................................................................................44
XXV. VALVE DRAWINGS ............................................................................................ 44
Page iii Revised: 03/11/99