Reznor VR Unit Installation Manual - Manual (Page 27)

Form I-VR, P/N 205202 R13, Page 26
FIGURE 25 - Attach Single-Wall Metal Vent Pipe to Exhaust Heat Exchanger Tube
5. Vent System Support - Vent pipe support is especially important with the
tubular infrared system because of the added stress which may be caused by
expansion and contraction of the overall system. Support lateral runs a mini-
mum of every six feet (1.8M) using non-combustible material, such as steel
strap or chain. Do not rely on the heater for support of either horizontal or verti-
cal vent pipe.
6. Condensation - If single-wall vent pipe is exposed to cold air or run through
unheated areas, it must be insulated. Where extreme conditions are antici-
pated, install a means of condensate disposal.
7. Vent Terminal and Vent Cap - The vent terminal and vent cap must be
the same diameter as the vent run. Terminate the vent system with a Reznor
Option CC1 vent cap. A different style vent cap could cause nuisance problems
and/or unsafe conditions.
See the illustrations in
FIGURES 26 and 27 for requirements of both vertical
and horizontal vent termination. Using either single or double wall vent termi-
nals is illustrated. Many local codes require the use of double-wall (Type B)
vent for the portion of vent pipe (terminal) on the outside of the building.
If double-wall pipe is used in the vent terminal, follow the instructions in the
Addendum, page 45, to attach the vent cap and to connect the double-wall
pipe to the single-wall vent pipe.
NOTE: For optional vent terminal installations, see dual vent terminal option,
Paragraph 6.4.2 or unvented installation in Paragraph 6.4.3.
1) Slide coupling (with bolts toward the bottom) over exhaust heat exchanger tube as far as it will go.
2) Slide elbow or straight pipe into coupling until it stops.
3) Tighten bolts on compression coupling.
4) At the holes in the top of the coupling, insert the two
self-drilling screws. One screw will secure the exhaust
heat exchanger tube and the other the vent pipe.
Use a compression coupling to attach a straight or elbow, single-wall vent pipe. Elbow
must be attached so that the vent is horizontal or above.
Elbow Attached
(horizontal or above)
Horizontal Vent
Slide vent pipe (straight or
elbow) into the coupling.
Exhaust
Tube
Coupling with bolts
toward bottom
Insert two self-
drilling screws
Horizontal Vent and
Inlet Air Terminals
Air Inlet Terminal Clearance - The bottom of the air inlet terminal shall be
located not less than one foot (305mm) above grade and at least 6 inches
(152mm) above anticipated snow depth.
Vent Terminal - A vent cap is required. Maintain a clearance of 18 inches
(457mm) from the wall to the vent terminal cap for stability under wind condi-
tions.
6.4 Venting and Combustion Air (cont’d) 6. Mechanical
(cont’d)
6.4.1 Specific Venting Requirements (cont’d)