Reznor VR Unit Installation Manual - Manual (Page 26)

Form I-VR, P/N 205202 R13, Page 25
2. Vent Pipe Type - Use only 4-inch diameter vent pipe.
If the type of vent required is Category III (refer to Vent Category Table,
page 24), use either a vent pipe approved for a Category III heater or appropri-
ately sealed 26-gauge galvanized steel or equivalent single-wall pipe.
If the type of vent required is Category I (refer to Vent Category Table, page
24), unsealed 26-gauge galvanized steel or equivalent single-wall pipe or dou-
ble-wall (Type B) vent pipe may be used.
3. Vent Pipe Joints - Vent system joints depend on the vent category and the
type of pipe being used.
If installed as a Category III appliance and using single-wall vent pipe,
join pipes with at least two non-corrosive screws per vent pipe joint and seal
all joints to prevent leakage of flue gases into the building. For sealing joints,
aluminum tape suitable for 550°F (required in California) or silicone sealant
is recommended. Vent tape is available from the heater manufacturer as P/N
98266.
If installed as a Category III appliance and using vent pipe specifically
approved for Category III vent systems, follow the pipe manufacturer’s
instructions for proper sealing. ( NOTE: Single-wall pipe must be used to con-
nect to the exhaust heat exchanger tube.)
If installed as a Category I appliance (allowed only for Sizes 50-125 when
at least 1/2 of the total equivalent length of the vent system is vertical),
use at least two non-corrosive screws per vent pipe joint on single-wall pipe or
follow the pipe manufacturer’s instructions for joining double-wall pipe. When
attaching double-wall pipe to single-wall pipe or the vent cap, follow the instruc-
tions in the Addendum Section, page 45. ( NOTE: Single-wall pipe must be
used to connect to the exhaust heat exchanger tube.)
4. Attach Vent Pipe to Heater (FIGURE 25) - Use a compression coupling to
attach the vent pipe to the exhaust heat exchanger tube.
NOTE: Use equivalents listed when calculating for elbows and optional dual vent adapter box (Option
CC5).
Vent Length Table
Vent Length Table for Tubular Infrared Heaters
Input
Size
(000)
Straight Tube Length
(ft)
Vent
Diameter
(inches)
Vent Length
Equivalent Length for
Elbow Dual Vent
Adapter Box
*
feet M 90° 45°
Max Min Max Min ft M ft M ft M
50 20, 25, 30, 35, 40 4 20 5 6.1 1.5 3 0.9 1-1/2 0.5 3 0.9
75
20, 25
4
45 5 13.7 1.5 6 1.8 3 0.9 6 1.8
30, 35 35 5 10.7 1.5 5 1.5 2-1/2 0.8 5 1.5
40 20 5 6.1 1.5 3 0.9 1-1/2 0.5 3 0.9
100
30, 35
4
45 5 13.7 1.5 6 1.8 3 0.9 6 1.8
40, 45 35 5 10.7 1.5 5 1.5 2-1/2 0.8 5 1.5
50 20 5 6.1 1.5 3 0.9 1-1/2 0.5 3 0.9
125 30, 35, 40, 45, 50, 55, 60 4 60 5 18.3 1.5 12 3.7 6 1.8 12 3.7
150 40, 45, 50, 55, 60 4 60 5 18.3 1.5 12 3.7 6 1.8 12 3.7
175 40, 45, 50, 55, 60, 65, 70 4 60 5 18.3 1.5 12 3.7 6 1.8 12 3.7
200 50, 55, 60, 65, 70 4 60 5 18.3 1.5 12 3.7 6 1.8 12 3.7
*
Must be deducted from the total vent length of each heater.
surrounding ambient temperature is 60°F unless otherwise noted (See Vent
Requirement No. 6, Condensation).
Do not exceed maximum vent length. Minimum vent length is 5 feet (1.5M).