12, Oil Filter; 13, Oil Burner Nozzles; 14, Combustion Chamber - Nordyne O4MD Installation, Operation And Maintenance Manual

The furnace may be installed with a one-pipe system with
gravity feed or lift. The maximum allowable lift on a single
line system is 8 feet. Lift should be measured from the
bottom (outlet) of the tank, to the inlet of the burner.
Sizing a single line system is complex because of the
difficulty estimating the pressure drop through each
fitting, bend and component in the line. In general, keep
single line systems short as possible. If the furnace is to
be installed in a suspended position, a two-pipe system
may be the better alternative. 2-stage oil pumps may be
used with both single line and two line systems. 2-stage
pumps are available from your HVAC wholesaler. The
following chart shows the allowable line lengths
(horizontal + vertical) for single and two stage oil pumps.
All distances are in feet.
Copper Tubing Oil Line Lengths
Single Stage 2-Stage
Lift _" O.U. O" O.U. _" O.U. O" O.U.
Tubing Tubing Tubing Tubing
0 53 100 68 100
1 49 100 65 100
2 45 100 63 100
3 41 100 60 100
4 37 100 58 100
5 33 100 55 100
6 29 100 53 100
7 25 99 50 100
8 21 83 48 100
9 17 68 45 100
10 13 52 42 100
12 ...... 37 100
14 ...... 32 100
16 ...... 27 100
18 ...... 22 88
In retrofit applications, where an existing oil line system is
in place, a vacuum check will help determine whether a
2-stage oil pump is necessary. The vacuum in a system
featuring a single stage oil pump should not exceed 6"
Hg. The vacuum in a system featuring a 2-stage oil pump
should not exceed 15" Hg. (inches of mercury).
NOTE: Two-pipe oil line systems require the installation
of the bypass plug in the oil pump. Consult pump
manufacturer's instructions
For additional information, see the installation information
sheet affixed to the oil burner.
12. OIL FILTER
All fuel systems should include an oil filter between the
fuel oil storage tank and the oil burner. For best results,
install the oil filter as close to the burner as possible.
When using an oil burner nozzle smaller than 0.65 U.S.
gallons per hour, install an additional 7 to 10 micron filter
as close as possible to the oil burner. For further details
of the oil supply tank and piping requirements, please
refer to the instructions and illustrations in the oil burner
and oil pump instructions shipped with the furnace.
13. OIL BURNER NOZZLES
The O4MD-091A-12-F furnace is certified for multiple
firing rates, ranging nominally from 60,000 to 90,000
Btu/hr.
The O4MD-140A-16-F furnace is certified for multiple
firing rates, ranging nominally from 90,000 to 130,000
BTU/hr. By manipulating the oil burner nozzle, flame
retention head, and temperature rise, the furnace may be
fired at an ideal rate for a wide range of structures.
Note: A conversion kit, Part No. 36000069 is available to
convert the O4MD-091A-12-F, 60 - 80 MBH model to the
O4MD-091A-12-F, 90 MBH model. The O4MD-091A-12-
F 90 MBH kit includes the 0.75 USGPH nozzle, 23/4-inch
static plate and F3 burner head.
Note: A conversion kit, Part No. 00600050 is available to
convert the O4MD-140A-16-F 90 -120 MBH to an
O4MD-140A-16-F 130 MBH. The O4MD-140A-16-F 130
MBH kit includes the 1.10 USGPH nozzle and F6 burner
head.
MODEL NOZZLE HEAD
O4MD-091A-12-F (060) 0.50 / 60°A F0
O4MD-091A-12-F (080) 0.65 / 60°A F0
O4MD-091A-12-F (090) 0.75 / 60°A F3
O4MD-140A-16-F (090) 0.75 / 80 ° A F3
O4MD-140A-16-F (100) 0.85 / 80 ° A F3
O4MD-140A-16-F (120) 1.00 / 60 ° A F3
O4MD-140A-16-F (130) 1.10 / 70 ° A F6
14. COMBUSTION CHAMBER
This furnace is equipped with an efficient cerafelt
combustion chamber. It is held in place by a retaining
bracket. Check the alignment of the combustion chamber
before firing. It is possible for the combustion chamber to
shift if subjected to rough handling during transit.
The cerafelt combustion chamber is quite soft initially.
After firing, it becomes very brittle. Be sure to do all
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