3 duct furnace airflow, 3 power venting, option ca 6.2.2 vent outlet size, 4 vent control damper, option av7 – Reznor X Unit Installation Manual User Manual
Page 11: 1 pressure drop and temperature rise by size
Form I-X, P/N 150491 R10, Page 11
Vertical Height
of the Vent
Vent Diameter
5"
6"
7"
8"
9"
10"
12"
ft
M
ft
M
ft
M
ft
M
ft
M
ft
M
ft
M
Maximum Horizontal Run for Double-Wall Type B Connector and Double-Wall Type B Vent
6ft (1.8M)
6
1.8
6
1.8
6
1.8
6
1.8
N/A
6
1.8
6
1.8
8ft (2.4M)
8
2.4
8
2.4
16
4.9
16
4.9
16
4.9
16
4.9
10ft (3.0M)
10
3
16
4.9
20
6.1
20
6.1
20
6.1
20
6.1
15ft (4.6M)
16
4.9
16
4.9
30
9.1
30
9.1
30
9.1
30
9.1
20ft (6.1M)
20
6.1
30
9.1
30
9.1
30
9.1
30
9.1
30
9.1
30ft (9.1M)
20
6.1
40
12.2
40
12.2
40
12.2
40
12.2
40
12.2
Maximum Horizontal Run for Single-Wall Metal Pipe
6ft (1.8M)
2
0.6
2
0.6
2
0.6
2
0.6
2
0.6
2
0.6
2
0.6
8ft (2.4M)
5
1.5
5
1.5
10
3
10
3
10
3
10
3
10
3
10ft (3.0M)
5
1.5
10
3
15
4.6
15
4.6
15
4.6
15
4.6
15
4.6
15ft (4.6M)
5
1.5
10
3
15
4.6
20
6.1
20
6.1
20
6.1
20
6.1
20ft (6.1M)
-
-
10
3
15
4.6
20
6.1
20
6.1
20
6.1
20
6.1
6.2.3 Power Venting,
Option CA
6.2.2 Vent Outlet Size
Model X duct furnaces have the following vent outlet size and shape:
Model Size
75
100
125 150, 175 200, 225 250, 300 350, 400
Size and Configuration
of Vent Outlet
5"
Round
6"
Round
7"
Oval
8"
Oval
8"
Round
10"
Oval
12"
Oval
Vent Pipe
Diameter
Maximum* Vent Length (ft or M) for Furnace with
Optional Power Venter (Option CA)
75, 100, 125, 150
175
200
225
250
300
350
400
4"
ft
100
75
50
35
30
15
N/A
M
30
23
15
11
9
4.6
6"
ft
N/A
100** 100**
100
92
M
30**
30**
30
28
Table Notes: * Reduce the
vent pipe lengths as follows
for each item: 45° Elbow - 7
ft (2.1M); 90° Elbow - 15
ft (4.6M); Reznor
®
Option
CC1 Vent Cap - 10 ft (3M).
** If the venter outlet is
4", connect a taper-type
"enlarger" to the vent outlet
when installing 6" vent pipe.
To install a gravity-vented furnace in an area where horizontal venting is required or
where negative building pressure inhibits gravity venting, include an optional power
venter in the application. Use only a power venter provided by the furnace manu-
facturer and carefully follow the instructions included in the optional venter package.
Use the venter adapter provided to connect the power venter to the heater.
DO NOT
INSTALL THE POWER VENTER WITHOUT THE VENTER ADAPTER.
With an Option CA power venter installed, the furnace may be vented either horizon-
tally or vertically. Do not exceed the maximum vent lengths shown in table. Minimum
vent length is 5 ft (1.5M).
6.2.4 Vent Control
Damper, Option AV7
The vent damper option is a motorized damper that
will close when the heater is not operating. The vent
damper option is applicable only with spark ignition
with lockout (Option AH3) and is shipped in a sepa-
rate box. Follow the manufacturer's instructions to
install it in the vent. See the wiring diagram on the
heater to make the wiring connections.
NOTE: The
wiring harness with the vent damper is 8 ft (2.4M) in
length. The vent damper should be located as close
to the heater as possible and cannot be more than 8
ft (2.4M) from the ignition controller.
FIGURE 10 - Option AV7,
Vent Control Damper
NOTE: The ignition
controller has a safety
feature that once it is used
with a vent damper, it will no
longer operate a unit without
a vent damper.
6.3 Duct Furnace
Airflow
6.3.1 Pressure Drop and Temperature Rise by Size
To determine temperature rise, the inlet and outlet air temperatures should be mea-
sured at points not affected by heat radiating from the heat exchanger. The following
chart shows the approved temperature rise range with the required CFM and the inter-
nal pressure drop for each size of unit.