Nordyne Downflow Direct Vent Forced Air Gas Oil Furnaces SERIES M1B - Manual (Page 14)

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4. The four warning tags supplied must be
installed as follows:
• To weather cap
• To fuel line connection point (Gas) or furnace
burner (Oil)
• To furnace fl ame observation door (Gas or
Oil)
• To furnace wall thermostat
5. Transit-mode weather cap to be removed and
upper Roof Jack crown installed (See Figure
24). Do Not Discard screws.
6. Place upper Roof Jack (crown) on to the fl ue
pipe assembly. NOTE: Make sure inside fl ue
pipe attaches over inner fl ue pipe and outer
Roof Jack pipe fi ts over outer pipe.
7. Secure in place using three (3), #10, 1/2” sheet
metal screws removed in step 5. Do not use
the same holes which secured the rain cap in
place.
8. Remove and discard venting system warning
tags.
WARNING:
Failure to properly secure the fl ue
pipe to the furnace may result in
fi re, explosion or asphyxiation
when operating the furnace.
SCREWS
COMPLETED
ASSEMBLY
TO FURNACE
UPPER ROOF
JACK (CROWN)
INNER FLUE
PIPE
FLUE ASSEMBLY
OUTER PIPE
FLASHING
WEATHER CAP
Figure 23. Roof Jack Crown
ELECTRICAL INFORMATION
WARNING:
To avoid electric shock, personal
injury, or death, turn off the electric
power at the disconnect or the
main service panel before making
any electrical connections.
• Electrical connections must be in compliance
with all applicable local codes with the current
revision of the National Electric Code (ANSI/
NFPA 70).
• For Canadian installations the electrical
connections and grounding shall comply with
the current Canadian Electrical Code (CSA
C22.1 and/or local codes).
Line Voltage Wiring
It is recommended that 115VAC line voltage be
supplied to the furnace from a dedicated branch
circuit containing the correct fuse or circuit
breaker for the furnace. See Table 10 (page 31).
IMPORTANT NOTE: An electrical disconnect
must be installed readily accessible from and
located within sight of the furnace. Refer to
the wiring diagram inside the control box
cover or Figures 40 - 45 (pages 34 - 39) for the
wiring of your particular unit. Any other wiring
methods must be acceptable to authority
having jurisdiction.
CAUTION:
Label all wires prior to disconnection
when servicing controls. Wiring errors
can cause improper and dangerous
operation. Verify proper operation
after servicing.
IMPORTANT NOTE: Proper line voltage
polarity must be maintained in order for the
control system to operate correctly. Verify
the incoming neutral line is connected to
the white wire and the incoming “hot” line is
connected to the black wire. The furnace will
not operate unless the polarity and ground
are properly connected as shown in Figure 25.
Route all electrical wiring to the left side of the
furnace. For installation of “A” Cabinet furnaces,
allow suffi cient slack in the wiring if an optional
cooling coil cabinet is added at a later time. Use
of copper conductors is recommended.