lp-505 Rev. 000 Rel. 015 Date 1.7.20
28
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.
Friction Loss Equivalent in Piping and Fittings
Fittings or Piping
Equivalent Feet
2”
3”
90 Degree Elbow*
5’
5’
45 Degree Elbow
3’
3’
Coupling
0’
0’
Air Inlet Tee
0’
0’
Straight Pipe
1’
1’
Concentric Kit
3’
3’
V500 2” Kit
1’
N/A
V1000 3” Kit
N/A
1’
V2000 4” Kit
N/A
1’
Table 16 - *Friction loss for long radius elbow is 1 foot less. NOTE: Consult
Polypropylene venting instructions for friction loss and pressure drop
equivalents.
b. For example: If the 3” exhaust vent has two 90
o
elbows and 10
feet of PVC pipe we will calculate:
Exhaust Vent Equivalent Length = (2x5) + 10 = 20 feet.
Further, if the 3” intake pipe has two 90
o
elbows, one 45
o
elbow,
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.
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
3” Combined Vent Length
Minimum
Maximum
Minimum
Maximum
14’ (4.2M)
50’ (50M)
14’ (4.2M)
100’ (30M)
Maximum # of 90
o
Elbows
(2” and 3” Vent Diameters)
6
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
Figure 19 - Correct Installation into the Appliance Collar
Figure 20 - 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, CPVC, or stainless steel pipe or a Polypropylene
vent system approved for use with Category IV appliances.
ABS pipe material may be used on air intake 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
minimum of 4 foot intervals to prevent sagging of the pipe where
condensate may form.
collar. See Figure 19 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 20.
NOTE:
A reducing coupling MUST BE USED when transitioning
from 3” to 2” vent pipe. DO NOT use reducing bushings.
Summary of Contents for Hydra Smart RT-199
Page 40: ...lp 505 Rev 000 Rel 015 Date 1 7 20 40 Figure 38 150 Model Electrical Wiring Diagram ...
Page 41: ...lp 505 Rev 000 Rel 015 Date 1 7 20 41 Figure 39 150 Model Ladder Diagram ...
Page 42: ...lp 505 Rev 000 Rel 015 Date 1 7 20 42 Figure 40 199 Model Electrical Wiring Diagram ...
Page 43: ...lp 505 Rev 000 Rel 015 Date 1 7 20 43 Figure 41 199 Model Ladder Diagram ...
