Operating instructions

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Information and specifi cations outlined in this manual in effect at the
time of printing of this manual. Manufacturer reserves the right to
discontinue, change specifi cations or system design at any time without
notice and without incurring any obligation, whatsoever.
1. General ................................................................................................................................ 4
2. Safety Symbols ..................................................................................................................... 4
3. Introduction Models HML And HMLV ......................................................................................... 4
4. Heat Loss ............................................................................................................................. 4
5. Locating the Unit ................................................................................................................... 5
6. Furnace Used In Conjunction With Air Conditioning .................................................................... 5
7. Combustion Air ..................................................................................................................... 6
8. Chimney Venting ................................................................................................................... 6
9. Barometric Damper Control ..................................................................................................... 7
10. Optional Side Wall Venting ..................................................................................................... 7
11a. Fan Timer Board And Limit Control (HML) See Figure 3, page 15 .............................................. 7
11b. Fan Timer Board And Limit Control (HMLV) See Figure 4, page 15 ............................................. 7
12. Electrical Connections ........................................................................................................... 7
13. Humidifi er ........................................................................................................................... 8
14. Piping Installation ................................................................................................................ 8
15. Oil Filter ............................................................................................................................. 8
16. Oil Burner Nozzles ............................................................................................................... 8
17. Oil Burner Adjustment .......................................................................................................... 8
18. Burner Electrodes ................................................................................................................ 8
19. Burner Primary (Safety) Control ............................................................................................. 9
20. Combustion Chamber ........................................................................................................... 9
21a. Circulating Air Blower (HML) ................................................................................................. 9
21b. Circulating Air Blower (HMLV) .............................................................................................10
22. Maintenance And Service .....................................................................................................10
23. Operating Instructions (HML)................................................................................................11
24. Operating Instructions (HMLV) ..............................................................................................11
Appendix A: Checkout and Adjustments ................................................................................. 12
A.1 Oil Burner Air Adjustment ....................................................................................................13
A.2 Burner Electrodes ...............................................................................................................14
A.3 Start Up ............................................................................................................................14
A.4 Special Instructions For Units Equipped With Riello Burners .......................................................14
A.5 Final Check Out ...................................................................................................................15
Appendix B: Wiring Diagrams ................................................................................................ 18
Chimney Vent Furnace Wiring Diagram HML/HMLV ........................................................................18
Direct Vent Furnace Wiring Diagram HML/HMLV ............................................................................19
Appendix C - Sequence of Operation and Troubleshooting ..................................................... 20
C.1 Troubleshooting ...................................................................................................................21
C.2 Preliminary Steps ................................................................................................................21
C.3 Check Oil Primary Control .....................................................................................................21
Appendix D - Homeowner’s Reference Table .......................................................................... 25
Parts Listing: Chimney Vent Models HML80(C2,CRF2) and HMLV80(C2,CRF2) ....................... 26
Parts Listing: Direct Vent Models HML80(CB2U2,CRBU2) and HMLV80(CB2U2,CRBU2) .......... 27
Parts Diagram HML and HMLV ................................................................................................ 28