1
OIL-FIRED WARM AIR
FURNACE
P3DHX12F08001 P2DHX16F12001
(Downflow or Horizontal Models)
P2LBX16F14501 P4LBX20F19001
(Lowboy Models)
INTRODUCTION............................................................. 2
HEAT LOSS.................................................................... 2
LOCATION OF UNIT ......................................................2
AIR CONDITIONING....................................................... 4
COMBUSTION AIR......................................................... 4
CHIMNEY VENTING....................................................... 4
OIL TANK........................................................................6
PIPING INSTALLATION................................................. 6
ELECTRICAL CONNECTIONS ......................................6
CIRCULATING AIR BLOWER........................................7
OIL BURNER.................................................................. 8
FURNACE INSTALLATION SET-UP.............................9
MAINTENANCE AND SERVICE...................................10
OPERATING INSTRUCTIONS .....................................10
TABLE A-1: BECKETT OIL BURNER SET-UP ...........11
TABLE A-2: DIRECT DRIVE BLOWER SET-UP .........12
TABLE A-3: BELT DRIVE BLOWER SET-UP............. 12
TABLE A-4: DIRECT DRIVE BLOWER
CHARACTERISTICS.................................................... 13
TABLE A-5: BELT DRIVE BLOWER
CHARACTERISTICS.................................................... 13
GENERAL DIMENSIONS - P2LBX16F14501...............14
GENERAL DIMENSIONS - P4LBX20F19001...............14
GENERAL DIMENSIONS - P4LBX20F19001...............15
GENERAL DIMENSIONS - P3DHX12F08001.............. 15
GENERAL DIMENSIONS - P3DHX12F08001.............. 16
GENERAL DIMENSIONS - P2DHX16F12001.............. 16
GENERAL DIMENSIONS - P2DHX16F12001.............. 17
WIRING DIAGRAM: MODEL P3DHX12F08001........... 18
WIRING DIAGRAM: MODEL P2DHX16F12001........... 18
WIRING DIAGRAM: MODEL P2LBX16F14501........... 19
WIRING DIAGRAM: MODEL P4LBX20F19001........... 19
R7184 DETAILED SEQUENCE OF OPERATION........20
R7184 LED DIAGNOSTIC LIGHT.................................22
Table C-1: Cad Cell Resistance................................. 22
R8184N NOTES............................................................ 22
TABLE C-2: R7184 TROUBLESHOOTING.................23
TABLE C-3: SYSTEM AND GENERAL
TROUBLESHOOTING.................................................. 25
P4LBX20F19001 ASSEMBLY NOTES.........................28
P3DHX SERIES DOWNFLOW CONFIGURATION
NOTES.......................................................................... 28
P3DHX12F08001 VESTIBULE KIT...............................29
REPAIR PART LIST – P3DHX12F08001A...................30
REPAIR PART LIST – P2DHX16F12001A...................31
REPAIR PART LIST – P2LBX16F14501A................... 32
REPAIR PART LIST – P4LB SERIES.......................... 33
REPLACEMENT PART CONTACT INFORMATION.... 34