Nortek SD Ultra Low Nox Series, Installation Instructions Manual

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transitioning the PVC pipe from 2” to 3”:
• If the size of the PVC flue needs to be increased from 2”
to 3”, two, 2” x 45° PVC elbows may be used to achieve
the clearances needed between the coil box and the 2” x
3” coupling. See
Figure 16
.
• Install the 2” x 3” coupling in the vertical run only. If the
coupling is installed horizontally, it will allow water to build
up inside the furnace and cause a lock out condition.
• To avoid the clearance issue, it is recommended that the
furnace be vented through the left side or the right side of
the cabinet.
Condensate Drain Lines
If the furnace is installed in an area where temperatures
fall below freezing, special precautions must be made
for insulating condensate drain lines that drain to the
outdoors. If condensate freezes in the lines, this will
cause improper operation or damage to the furnace. It
is recommended that all drain lines on the outside of
the residence be wrapped with an industry approved
insulation or material allowed by local code.
• The method for disposing condensate varies according to
local codes. Consult your local code or authority having
jurisdiction.
• The condensate drain line must be trapped using a kit
(P/N- 922485) or field supplied parts. After the drain trap,
condensate can continue to the drain by connecting to a
recommended 3/4” ID minimum drain line, but no smaller
than the original tubing ID supplied by the manufacturer.
The drain line should slope downward away from the
furnace to ensure proper drainage.
• The placement of the condensate drain lines will depend
on the configuration selected in
Table 3 (page 14)
. The
drain lines can be routed out the left or right side of the
furnace, but must maintain a downward slope to ensure
proper condensate drainage. The J-trap may need to be
rotated to the side that matches your setup. See
Figure 26
(page 40)
,
Figure 27 (page 41)
,
Figure 28 (page 42)
,
or Figure 29 (page 43). To rotate the J-trap, loosen the
clamp on the drain tube, rotate the J-trap to either side,
and retighten the clamp.
• It is permissible to locate the trap away from the
furnace. The condensate drain system (J-trap and drain
tube) should be no more than 30 equivalent feet while
maintaining 1/4” per foot slope, and insulated if located in
an unconditioned space.
THREE GENERAL PRINCIPLES APPLY:
• Each condensate drain must be trapped separately using
a J-Trap or field supplied loop. After individually trapping
the condensate lines, it is acceptable to combine the
drains.
• There must always be a drain attached to the collector at
the outlet of the secondary heat exchanger.
• There must always be a drain at the lowest point of the
venting system. NOTE: If using a condensate pump, the
furnace drain line must be installed above the pumps
water line.
EXCEPTIONS & CLARIFICATIONS TO THE
GENERAL RULES:
• If the vent exits the furnace horizontally, the vent may be
2” PVC Elbow
(Field Supplied)
2” PVC Tee
1/2” x 3/4”
Hose Barb
2” PVC Pipe from Inline
Drain Assembly
(Not Included)
INSTALLATION OF PVC COMPONENTS
(TYPICAL ORIENTATION)
INSTALLATION OF PVC COMPONENTS
(ALTERNATE ORIENTATION)
2” PVC Tee
2” PVC Pipe from Inline
Drain Assembly
(Not Included)
1/2” Tubing (Field Supplied)
Drain Line Attached
to PVC Trap
(Do Not Trap)
1/2” Tubing (Field Supplied)
Drain Line Attached
to PVC Trap
(Do Not Trap)
PVC TRAP
PVC TRAP
1/2” x 3/4”
Hose Barb
Figure 15. PVC Components
Figure 16. Optional PVC Pipe Installation
2” x 45
0
PVC
Elbow
2” PVC Pipe
2” x 3” PVC
Coupling
Coil Box
them together using appropriate primer and cement. Refer
to the alternate orientation shown in
Figure 15
.
2. Install the 2” PVC Elbow on the end of the 2” PVC Tee.
Permanently bond them together using appropriate primer
and cement.
3. Install the reducer or PVC trap (if supplied) on the bottom
end of the PVC Tee. Permanenly bond them together using
appropriate primer and cement.
4. Install the 1/2” x 1/2” hose barb on the 2” PVC reducer.
NOTE
: Do not over tighten! Use an adequate amount of
Teflon tape on the threads. Do not use liquid sealants.
5. Verify all connections and joints for tight fit and proper
alignment with other vent pipes.
Optional PVC Pipe Installation
When running the 2” PVC pipe out through the top of the
furnace, there may be possible clearance issues when