Reznor UDAP-CV with option AV6 Option - Installation - Common Vent - Manual (Page 4)

Form I-UD-V-CV, P/N195677R5, Page 4
2.5 SECTION 1
- Vent System
Support
2.6 SECTION 1 -
Vent Terminal
2.3 SECTION 1 - 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 con-
nected 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.
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.
The vent terminal should be a minimum of six feet (1.8M) from adjoining build-
ings. The vent terminal should be six inches (152mm) higher than the antici-
pated snow depth but no less than two feet (610mm) above the roof. Where
the vent extends through the roof, a clearance thimble is required when the
flue pipe extends through combustible materials; follow the requirements of the
double-wall pipe manufacturer.
Terminate with a Reznor Option CC1 vent cap.
Maintain 6 inches (152 mm) clearance between a single-wall vent pipe and
combustibles.
For Type B double-wall vent pipe, follow the pipe manufacturer’s recommenda-
tions for clearance to combustibles.
2.7 SECTION 1 -
Clearance to
Combustibles
2.0 SECTION 1 -
Requirements
and
Instructions
for Venting
a Single
Category I
Model UDAP-
CV (cont’d)
2.4 SECTION 1 -
Condensation