Nortek SD Ultra Low Nox Series, Installation Instructions Manual

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rotated up to 3 different positions. Each variation has slightly
different requirements with regard to condensate disposal
and, in some cases, the need to seal the furnace cabinet.
IMPORTANT NOTE:
The Inducer Assembly must never be positioned to vent
downwards on horizontal installs.
Before using Table 3 , the number of pipes (1-pipe or 2-pipe)
connected to the furnace must be known. Find the proper
furnace style (upflow or horizontal) and then the side that
the pipes will exit from the furnace. Finally select the option
that properly matches your installation type in Figure 26
(page 40)
,
Figure 27 (page 41)
,
Figure 28 (page 42)
,
or
Figure 29 (page 43).
NOTE : It is important that Direct Vent (2-pipe) systems
maintain an airtight flow path from the air inlet to the flue
gas outlet. The furnace ships from the factory with two holes
in the cabinet for the air inlet and flue gas outlet. In certain
configurations, it is necessary to remove and relocate a
plastic plug in the furnace cabinet. If changing the position
of the air inlet and flue gas outlet, it is required that the
previous hole be closed off with the plastic plug to maintain
air tightness in the furnace. The hole locations are shown
in
Figure 23 (page 31)
.
Inducer Assembly Rotation
WARNING:
Inducer rotation must be completed before
the furnace is connected to gas and electric. If
both utilities have been connected, follow the
shutdown procedures printed on the furnace
label and disconnect the electrical supply.
CAUTION:
It is good practice to label all wires prior to
disconnection. Wiring errors can cause improper
and dangerous operation.
1. Disconnect the electrical harness from the inducer
assembly.
2. Remove the inducer assembly ground wire from the blower
deck.
3. Remove 3 screws securing the inducer assembly to the
header box.
4. Rotate the inducer assembly to its new position.
5. Secure the inducer assembly to the header box by
reinstalling the three screws. If the inducer assembly is
rotated to the left or right side of the furnace, use the extra
screw provided in the parts package.
6. Remove the cabinet plug from side of furnace and reinstall
in hole on opposite side of cabinet.
7. Install in-line drain assembly and tubing.
8. Install all condensate drain lines. See
Figure 26 (page 40)
,
Figure 27 (page 41)
,
Figure 28 (page 42)
, or
Figure 29
(page 43).
9. Reconnect the electrical harness to the inducer assembly.
10. Verify operation as detailed on the furnace label.
Pressure Switch Tubing
All upflow / horizontal furnaces have two switches, one
connected to the static tap on the inducer assembly and the
other to the collector box. Figure 30 (page 44) & Figure 31
(page 45)
display the proper routing of pressure switch
tubing.
Alternate Pressure Switch Location
In some inducer orientations, the inducer pressure switch may
interfere with gas pipe installation. Determine the side of the
cabinet the gas pipe will enter and see if the inducer pressure
switch needs to be moved. If the pressure switch interferes
with the gas pipe, use these instructions for relocating it to
an alternate location:
1. Shut off any electrical power to the furnace.
2. Label and disconnect the tubing and wires from the pressure
switch. See
Figure 30 (page 44)
&
Figure 31 (page 45).
3. Remove two screws securing the pressure switch to the
inducer housing.
4. Remove the pressure switch from the mounts on the
inducer housing and relocate it to the other set of mounts
90° from previous location.
5. Secure the pressure switch with two screws.
6. Reconnect the tubes and wires to the pressure switch.
Accessories
The components below are included in the extra parts bag
that is supplied with the purchase of your furnace. Depending
Lag
Bolt
Nuts (x2)
Washer
and
Lockwasher
Nuts (x2)
Threaded
Rod
Figure 12. Horizontally Suspended in an Attic
Table 3. Vent & Inducer Blower Options
*SD SERIES - CONVENTIONAL (1 PIPE)
VENT
DIRECTION
UPFLOW
HORIZONTAL
RIGHT
HORIZONTAL
LEFT
Up Option 1 Option 7 Option 10
Right Option 2 Option 8 N/A
Left Option 3 N/A Option 9
*SD SERIES - DIRECT VENT (2-PIPE)
VENT
DIRECTION
UPFLOW
HORIZONTAL
RIGHT
HORIZONTAL
LEFT
Up Option 4 Option 11 Option 14
Right Option 5 Option 12 N/A
Left Option 6 N/A Option 13