Operating instructions
30173 Rev B 4/29/2008 
2
TABLE OF CONTENTS 
1. INTRODUCTION .................................................................................................................................3 
2. HEAT LOSS ........................................................................................................................................3 
3. LOCATION OF UNIT..........................................................................................................................3 
4. AIR CONDITIONING APPLICATIONS ...............................................................................................3 
5. COMBUSTION AIR.............................................................................................................................4 
6. CHIMNEY VENTING ...........................................................................................................................4 
7. BAROMETRIC DAMPER CONTROL. ................................................................................................4 
8. OPTIONAL SIDE WALL VENTING.....................................................................................................5 
9a, 9b. FAN TIMER BOARD AND LIMIT CONTROL (FIGURE 4 AND 5) .............................................5 
10. ELECTRICAL CONNECTIONS.........................................................................................................5 
11. HUMIDIFIER......................................................................................................................................6 
12. PIPING INSTALLATION ...................................................................................................................6 
13. OIL FILTER .......................................................................................................................................6 
14. OIL BURNER NOZZLES...................................................................................................................6 
15. OIL BURNER ADJUSTMENT...........................................................................................................6 
16. BURNER ELECTRODES..................................................................................................................6 
17. BURNER PRIMARY (SAFETY) CONTROL......................................................................................7 
18. COMBUSTION CHAMBER...............................................................................................................7 
19a, 19b. CIRCULATING AIR BLOWER................................................................................................7 
20. MAINTENANCE AND SERVICE.......................................................................................................7 
21. OPERATING INSTRUCTIONS..........................................................................................................8 
22. ECM BLOWER MOTOR OPERATION
….………………………………………………………………………..9 
APPENDIX A- HML-C AND HMLV-C ....................................................................................................10 
A.1 OIL BURNER AIR ADJUSTMENT ..................................................................................................11 
A.2 BURNER ELECTRODES ................................................................................................................12 
A.3 START UP .......................................................................................................................................12 
A.4 SPECIAL INSTRUCTIONS FOR UNITS EQUIPPED WITH RIELLO BURNERS...........................12 
APPENDIX B: WIRING DIAGRAMS......................................................................................................16 
OPERATION OF OIL BURNER .............................................................................................................18 
APPENDIX C OIL PRIMARY CONTROL DETAILED SEQUENCE OF OPERATION  .........................19 
OIL PRIMARY CONTROL LED DIAGNOSTIC LIGHT..........................................................................23 
FINAL CHECK OUT...............................................................................................................................29 
HOMEOWNER’S REFERENCE TABLE................................................................................................30 
PARTS LISTING: HIGHBOY MODEL: HML – 80C AND HMLV-80C ...................................................31 
NOTES: ..................................................................................................................................................................34 










