Reznor UDBP Option - Installation - Power Venting - Manual (Page 7)

Form I-UD-V-PV, P/N 195675R12, Page 7
3.3 Venter (Flue)
Outlet
Venter Outlet Attachment Requirements:
Depending on the size of vent pipe as determined in Paragraph 3.2, attach either the
vent pipe directly to the collar or a taper-type connector. For Category III, attach a 4”
appliance adapter from Category III pipe manufacturer directly to the collar, then use
a reducer if using 3” pipe.
NOTE: If attaching double-wall pipe to the heater, follow instructions in Addendum, Section A, pages 10-11.
Commercial/Industrial Installation
Models UDAP and UDBP - ALL Sizes
TABLE 5 -
Venter Outlet
Size
UDAP or UDBP 30 45 60 75 100 125 150 175 200 225 250 300 350 400
Outlet
Diameter
inches 4 4 4 4 4 4 5 5 5 5 5 6 6 6
mm 102 102 102 102 102 102 127 127 127 127 127 152 152 152
3.4 Vent System
Sealing
Vent system joints depend on the type of pipe being used (See “Type of Vent Pipe”,
Paragraph 3.1, page 6).
• When using Category III vent pipe, follow the pipe manufacturer’s instructions for
joining pipe sections. When attaching Category III pipe to the venter outlet or the
vent cap, make secure, sealed joints following a procedure that best suits the style
of Category III pipe being used.
• If using single wall, 26-gauge or heavier galvanized pipe, secure slip-fit
connections using sheetmetal screws or rivets. Seal all joints and seams of single-
wall vent pipe inside the building with aluminum tape or silicone sealant.
• If using double-wall (Type B) vent pipe, follow the pipe manufacturer’s instructions
for joining pipe sections.
For joining double-wall pipe to heater collar, single-wall pipe, and vent cap, follow
the illustrated instructions in Addendum Section A, pages 10-11.
Support horizontal runs every six feet (1.8M).
Support vertical runs of Type “B” double-wall or Category III vent pipe in accordance
with the requirements of the pipe manufacturer.
Support vertical single-wall pipe in accordance with accepted industry practice.
Do not rely on the heater for support of either horizontal or vertical pipes. Use non-
combustible supports on vent pipe.
3.5 Vent System
Support
3.6 Condensation
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 vent
pipes be fitted with a tee, a drip leg, and a cleanout cap to prevent any moisture
in the vent pipe from entering the unit. The drip leg should be inspected and
cleaned out periodically during the heating season.
On all Model Sizes, any length of single-wall vent pipe exposed to cold air or run
through an unheated area or an area with an ambient temperature of 50°F or less
must be insulated along its entire length with a minimum of 1/2” foil-faced fiber-
glass, 1-1/2# density insulation.
On horizontal vent runs, the flue pipe
must be pitched down toward the terminal
end 1/4” per foot for condensate drainage. Slope applies to entire length of horizontal
vent run. Failure to pitch vent run properly may damage the heater due to condensate
running back into the unit.
The vent terminal pipe must be double-wall (Type B). Terminate the vent with a Reznor ®
Option CC1 vent cap. A different style vent cap could cause nuisance problems or
unsafe conditions. The vent cap must be the same size as the vent pipe.
See
TABLE 6 and FIGURE 3 for requirements of a horizontal vent terminal. See FIG-
URE 4 for requirements of a vertical vent termination.
3.7 Vent Terminal