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CAPACITY OF BLACK IRON GAS PIPE (CU. FT. PER HOUR)
NOMINAL
BLACK IRON
PIPE DIAMETER
(in.)
1 1/4
1 1/2
The cubic feet per hour listed in the table above must be greater than the cubic feet per hour of gas flow required
by the furnace. To determine the cubic feet per hour of gas flow required by the furnace, divide the input rate
of the furnace by the heating value of the gas:
Cubic Feet Per Hour Required
Table 6. Capacity of Black Iron Gas Pipe (cu. ft. per hour)
DRAINAGE OF CONDENSATE
FROM FURNACE
The condensate drainage system is internal to
the furnace. It is not recommended to connect
additional traps to the exterior of the furnace.
Doing so will have adverse effects on the opera-
tion of the furnace. The drain may exit either the
right or left side of the furnace cabinet.
The condensate drain can be routed to a flow
drain or to a condensate pump. Ensure that the
drain maintains a downward slope from the unit
to the drain. Refer to Figure 23 for more details.
For a right side drain simply extend the tubing out
of the hole in the cabinet, see Figure 23. For a
left side drain follow the steps below:
1.
Loosen the clamp on the soft exit tube (see
Figure 23.)
2.
Rotate the soft exit tube (counter clock-
wise, 180° upflow models; clockwise 90°
downflow models.)
3.
Re-tighten the clamp. MAKE SURE CLAMP
IS TIGHT TO AVOID LEAKAGE OF CON-
DENSATE.
4.
Route the tubing out of the hole located 8
inches up from the bottom furnace.
The condensate should drain from the plastic
collector box (location A in Figure 23) as droplets
or a small stream. If you notice the furnace has
operated for more than 5 minutes without drain-
ing or the red status light on the control board is
pulsing a 2-blink code follow the steps below.
FOR NATURAL GAS (SPECIFIC GRAVITY - 0.60)
10
20
1/2
130
90
3/4
280
190
150
1
520
350
285
1050 730
590
1600 1100 890
=
for Natural Gas (specific gravity = .60)
LENGTH OF PIPE RUN
(feet)
30
40
50
60
75
65
55
50
130
115
105
245
215
195
500
440
400
760
670
610
Input To Furnace (Btu/hr)
Heating Value of Gas (Btu/Cu. Ft.)
1.
Remove the collector box soft tube at
location A in Figure 23 and insure the exit
from the collector box is clear of any debris
or obstructions.
2.
Replace this tube and insure the fit to the
header spout is air tight. Air will be drawn
into the header if this connection is not tight.
3.
Check other tube connections along the
drain system. Insure that all are air tight.
NOTE: Industry research studies indicate that
when condensate is routed to an active drain,
household detergents, etc., buffer its acidity. If
the drain is not actively used or if codes require,
obtain a neutralizer kit NORDYNE part no.
902373 (usually contains limestone). Proper
drains and connections to the condensate tub-
ing are required as NORDYNE cannot be held
responsible for water leakage which occurs
due to loose hose connections or improperly
sealed drain line pipes.
GAS SUPPLY AND PIPING
This furnace is equipped for either left or right
side gas entry. Typical gas service hook-ups
are shown in Figure 24a. When making the gas
connection provide clearance between the gas
supply line and the entry hole in the furnace
casing to avoid unwanted noise and/or damage
to the furnace.
All gas piping must be installed in compliance
with local codes and utility regulations. Some
local regulations require the installation of a
manual main shut-off valve and ground joint
union external to the furnace. The shut-off valve
70
80
45
40
95
90
180
170
370
350
560
530
25
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