HTP PHR199-55C - Manual (Page 35)

35
LP- 325 REV. 3.21.14
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 PHR100 and PHR130(C) and 3" for the PHR160(C) and PHR199(C).
2. The maximum total equivalent length of
2” exhaust vent and intake pipe must not exceed 85 feet. The total maximum equivalent
length of 3” exhaust vent and intake pipe must not exceed 200 feet.
F. LONGER VENT RUNS
1. 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 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
PHR100
PHR130(C)
85’ @ 2” 3” X 2” 125’ at 3”
PHR160(C)
PHR199(C)
200’ @ 3” 4” X 3” 200’ at 4”
Table 5 – Vent Sizing – Diameter and Length
c. If the transition occurs at a distance greater than 15 equivalent feet from the water appliance, the maximum equivalent
length will be reduced.
Total maximum equivalent length of increased diameter exhaust vent and intake pipe must not exceed the lengths defined in this
manual. 125 maximum total
equivalent feet for 2” increased to 3” diameter vent pipe; 200 maximum total equivalent feet for 3”
increased to 4” diameter vent pipe. Failure to keep the total equivalent length below the maximum lengths determined in this manual
will result in faulty appliance operation, substantial property damage, serious personal injury, or death.
TRANSITION POINT (FT. FROM
WATER APPLIANCE)
TEL OF OVERSIZED VENT PIPE (FT.)* MAXIMUM TEL OF ALL VENT PIPE (FT.)
15 95 125
20 77-1/2 117-1/2
25 60-1/2 110-1/2
30 43 103
35 26 96
40 8-1/2 88-1/2
NONE 0 85
Table 6 – TEL = Total Equivalent Length *Oversized vent pipe diameter is 1” or greater than factory supplied connection.
DETERMINING FRICTION LOSS
a. The equivalent length of elbows, tees, and other fittings are listed in the Friction Loss Table, Table 7.