Exhaust Vent And Intake Pipe Sizing; Tightening Water Heater Collar To Exhaust Vent And Intake Pipe; Exhaust Vent And Intake Pipe Installation - Westinghouse Premium WGRT 199 Series Installation, Start-Up, Maintenance, Parts, Warranty

E. Exhaust Vent and Intake Pipe Sizing
1. The exhaust vent and intake pipe size is 2" for 150 models, and 3" for
199 models.
2. The total equivalent length of 2" exhaust vent and intake pipe should
not exceed fifty (50) feet; 3" exhaust vent and intake pipe should not
exceed one hundred (100) feet.
a. The equivalent length of elbows, tees, and other fittings are
listed in the Friction Loss Table.
b. For example: If the 3" exhaust vent has two 90
feet of PVC pipe we will calculate:
Exhaust Vent Equivalent Length = (2x5) + 10 = 20 feet.
Further, if the 3" intake pipe has two 90
and 10 feet of PVC pipe, the following calculation applies:
Intake Pipe Equivalent Length = (2x5) + 3 + 10 = 23 feet.
Finally, if a concentric kit is used we find:
Total Equivalent Length = 20 + 23 + 3 = 46 feet.
The total equivalent length is 46 feet, well below the maximum of
100 feet.
c. Effort should be made to keep a minimum difference in
equivalent length between the exhaust vent and intake pipe.
3. The minimum total equivalent length is 14 feet.
Friction Loss Equivalent in Piping and Fittings
Fittings or Piping
90 Degree Elbow*
45 Degree Elbow
Coupling
Air Inlet Tee
Straight Pipe
Concentric Kit
V500 2" Kit
V1000 3" Kit
V2000 4" Kit
Table 16 - *Friction loss for long radius elbow is 1 foot less. NOTE: Consult
Polypropylene venting instructions for friction loss and pressure drop
equivalents.
NOTE: The intake pipe and exhaust vent lengths do not have to be of
equal length. There is no balancing requirement between intake and
exhaust.
2" Combined Vent Length
Minimum Maximum
14' (4.2M) 50' (50M)
Maximum # of 90
(2" and 3" Vent Diameters)
Table 17 - Approved Vent Lengths
Do not exceed the maximum lengths for vent pipes. Excessive length
could result in heater shutdown and property damage.
Failure to provide a minimum total vent length of 14 equivalent feet
could result in property damage and improper product operation.
F. Tightening Water Heater Collar to Exhaust Vent and
Intake Pipe
This appliance uses 2" or 3" diameter pipe for exhaust vent and intake
pipe. In order to use 2" pipe, it is required to reduce pipe size in a
vertical length of pipe with a 3" x 2" reducing coupling (not included).
Follow the steps below to install 3" vent pipe into the appliance vent
o
elbows and 10
o o
elbows, one 45
Equivalent Feet
2" 3"
5' 5'
3' 3'
0' 0'
0' 0'
1' 1'
3' 3'
1' N/A
N/A 1'
N/A 1'
3" Combined Vent Length
Minimum Maximum
14' (4.2M) 100' (30M)
o
Elbows
6
collar. See Figure 20 for additional details.
NOTE: Clean and dry the appliance connection. DO NOT use primer
or cement on the appliance connection.
1. Push the length of pipe into the connection until it touches
the bottom of the fitting.
2. Tighten the clamps using a screwdriver.
3. Ensure the pipe is secure before continuing installation.
4. For 2" installations, install the reducing coupling in a vertical
section of pipe. At least a 6" length of 3" pipe MUST BE
INSTALLED before reducing to 2". See Figure 21.
NOTE: A reducing coupling MUST BE USED when transitioning
from 3" to 2" vent pipe. DO NOT use reducing bushings.
elbow,
Figure 20 - Correct Installation into the Appliance Collar
Figure 21 - Transitioning from 3" to 2" Vent Pipe
G. Exhaust Vent and Intake Pipe Installation
All joints of positive pressure vent systems must be sealed
completely to prevent leakage of flue products into the living
space. Failure to do so could result in property damage, serious
injury, or death.
1. Use only solid PVC or CPVC pipe or a Polypropylene vent system
approved for use with Category IV appliances.
FOAM CORE PIPING IS NOT APPROVED FOR EXHAUST VENT
APPLICATIONS. Foam core piping may be used on air inlet piping
only.
2. Remove all burrs and debris from joints and fittings.
3. When using PVC or CPVC pipe, all joints must be properly cleaned,
primed, and cemented. Use only cement and primer approved for
use with the pipe material. Cement must conform to ASTM D2564
for PVC and ASTM F493 for CPVC pipe. NOTE: DO NOT CEMENT
POLYPROPYLENE PIPE.
4. Ensure the vent is located where it will not be exposed to
prevailing winds.
5. In all roof venting applications, exhaust discharge must point
away from the pitch of the roof.
6. To prevent water leakage, install adequate roof flashing where
the pipe enters the roof.
7. Do not locate vent over public walkways, driveways, or parking
lots. Condensate could drip and freeze, resulting in a slip hazard or
damage to vehicles and machinery.
8. Due to potential moisture build-up, sidewall venting may not
be the preferred venting option. To save time and cost, carefully
consider venting installation and location.
9. Horizontal lengths of exhaust vent must slope back towards the
water heater not less than ¼" per foot to allow condensate to drain
from the vent pipe.
10. The exhaust vent must terminate where vapors cannot make
accidental contact with people or pets, or damage shrubs or plants.
11. In vacant chimney applications, install and seal a rain cap over
existing chimney openings.
12. All piping must be fully supported. Use pipe hangers at a
whl-004 Rev. 000 Rel. 013 Date 5.1.18
29