Reznor UDAP-CV with option AV6 Option - Installation - Common Vent User Manual
Page 7
Form I-UD-V-CV, PN195677R5, Page 7
3.2 SECTION 2 -
Vent System
Joints/Sealing
Vent system joints depend on the type of pipe:
•
Single-wall pipe, 26-gauge or heavier galvanized, secure each slip-fit
connection with three sheetmetal screws or rivets. When connecting the
single-wall pipe to the Type B double-wall pipe, use an adapter made by
the Type B double-wall pipe manufacturer for connection of their Type B
double-wall pipe to single-wall pipe. Follow the Type B double-wall pipe
manufacturer’s instructions.
•
Type B double-wall pipe, follow the pipe manufacturer’s instructions
for joining and securing the pipe sections. If Type B double-wall pipe is
connected to the vent collar on the Model UDAP-CV, use an adapter made
by the Type B double-wall pipe manufacturer for that purpose. Follow the
Type B double-wall pipe manufacturer’s instructions.
CAUTION: Exceeding the specified vent pipe diameter and
length may result in condensate forming in the vent pipe.
On units with long vent runs (over 50% of maximum vent length allowed)
or installed in low ambient conditions (below 50°F), it is recommended
that the vent pipe be fitted with a tee, a drip leg, and a cleanout cap to pre-
vent moisture in the vent pipe from entering the unit. The drip leg should
be inspected and cleaned out periodically during the heating season.
A single-wall vent pipe run exposed to cold air or run through an unheated
area, or an area with an ambient temperature of 50°F or less,
must be insu-
lated along its entire length with a minimum of 1/2” foil-faced fiberglass, 1-
1/2# density insulation.
The horizontal vent run
must be pitched down toward the terminal end
1/4” per foot for condensate drainage. The slope applies to the entire length of
the horizontal vent run. Failure to pitch the vent run properly may damage the
heater due to condensate running back into the unit.
TABLE 4C - Maximum Horizontal Length of Type B Double-Wall
Connector Pipe for Model UDAP-CV* (Category I Common Vent)
Vertical
Height of
Vent
UDAP-CV Model Size
30
45
60
75
100
Diameter of Vent Connector (inches)
ft
M
4
4
4
4
5
6
1.8
2
2
2
2
3
7
2.1
3
3
3
3
4
8
2.4
4
4
4
4
5
10
3.0
5
5
5
5
6
15
4.6
5
5
6
6
7.5
20
6.1
5
6
6
6
7.5
30
9.1
5
6
6
6
7.5
* For the proper vent connector length and diameter of other appliances connected in
common with the Model UDAP-CV unit heater, refer to the appliance manufacturer’s
instructions or the National Fuel Gas Code.
3.3 SECTION 2 -
Condensation
3.4 SECTION 2 -
Vent System
Support
Use non-combustible supports on vent pipe. Support lateral runs every six feet
(1.8M). Support vertical runs of Type B double-wall vent pipe in accordance
with the requirements of the pipe manufacturer. Support lateral single-wall pipe
in accordance with accepted industry practices. Do not rely on the heater for
support of either horizontal or vertical vent pipe.