HTP PHE199-119 - Manual (Page 32)

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LP-314 REV. 3.24.14
The building owner is responsible for keeping the exhaust and intake terminations free of snow, ice, or other potential blockages, as
well as scheduling routine maintenance. Failure to keep the vent piping terminations clear and properly maintain the appliance could
result in property damage, severe personal injury, or death.
For each floor containing bedroom(s), a carbon monoxide detector and alarm shall be placed in the living area outside the bedrooms,
as well as in the room that houses the appliance. Detectors and alarms shall comply with NFPA 720 (latest edition). Failure to comply
with requirements for detectors and alarms could result in property damage, severe personal injury, or death.
E. EXHAUST VENT AND INTAKE PIPE SIZING
1. The exhaust vent and intake pipe size is 2" for the PHE130 and 3" for the PHE199.
2. The maximum total
equivalent length of 2” exhaust vent and intake pipe must not exceed 85 feet. The maximum equivalent length
of 3” exhaust vent and intake pipe must not exceed 200 feet.
a. The equivalent length of elbows, tees, and other fittings are listed in the Friction Loss Table, Table 4:
FRICTION LOSS EQUIVALENT IN PIPING AND FITTINGS
FITTINGS OR PIPING EQUIVALENT FEET
2” 3” 4”
90 DEGREE ELBOW* 5’ 5’ 3’
45 DEGREE ELBOW 3’ 3’ 1’
COUPLING 0’ 0’ 0’
AIR INLET TEE 0’ 0’ 0’
STRAIGHT PIPE 1’ 1’ 1’
CONCENTRIC VENT KIT 3’ 3’ N/A
V500 2” VENT KIT 1’ N/A N/A
V1000 3” VENT KIT N/A 1’ 1’
V2000 4” VENT KIT N/A 1’ 1’
Table 4 - *Friction loss for long radius elbow is 1’ less. NOTE: Consult Polypropylene venting instructions for friction loss and
pressure drop equivalents.
b. For example: If the vent size is 2”, and the exhaust vent has two 90° elbows and 10 feet of PVC pipe we will calculate:
Exhaust Vent Equivalent Length = (2x5) + 10 = 20 feet.
Further, if the intake pipe has two 90° elbows, one 45° elbow and 10 feet of PVC pipe, the following calculation applies:
Intake Pipe Equivalent Length = (2x5) + 3 + 10 = 23 feet.
Finally, if a concentric vent kit is used we find:
Total Equivalent Length = 20 + 23 + 3 = 46 feet.
The total equivalent length is 46 feet which is well below the maximum of 85 feet.
3. The minimum total equivalent length is 16 equivalent feet.
Failure to provide a minimum total vent length of 16 equivalent feet could result in property damage and improper product operation.
F. LONGER VENT RUNS
The maximum total equivalent length can be extended by increasing the diameter of both exhaust vent and intake pipe equally.
However, the transitions should begin a minimum of 15 total equivalent feet from the water appliance.
a. The maximum total equivalent length for increased diameter vent pipes is 125 feet for 2” transitioning to 3” pipe
(this number includes the minimum 15 total equivalent feet necessary for transition), and 200 maximum total
equivalent feet for 3” transitioning to 4” pipe (including the minimum 15 total equivalent feet necessary for
transition).
b. Transitions should always be made in vertical sections of pipe to prevent the condensate from pooling in the vent pipe.
MODEL
MAXIMUM TOTAL EQUIVALENT
LENGTH AT STANDARD VENT
CONNECTION
REDUCING
COUPLING MAXIMUM TOTAL EQUIVALENT LENGTH AT
MAXIMUM INCREASED VENT SIZE
PHE130 85’ @ 2” 3” X 2” 125’ at 3”
PHE199 200’ @ 3” 4” X 3” 200’ at 4”
Table 5 – Vent Sizing – Diameter and Length