HTP EL-399 - Manual (Page 32)

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LP- 293 REV. 5.20.14
When servicing is complete, you must make sure this cap is replaced securely. Failure to do so will cause venting issues that will result
in serious injury or death.
When installing a condensate pump, select one approved for use with condensing boilers and furnaces. The pump should have an
overflow switch to prevent property damage from condensate spillage.
It is very important that the condensate piping be no smaller than ½”. You must use a tee at the condensate connection with a branch
vertically up and open to the atmosphere, so as not to cause a vacuum that could obstruct the flow of condensate from the boiler. To
prevent sagging and maintain pitch, condensate piping should be supported with pipe supports.
The condensate line must remain unobstructed, allowing free flow of condensate. If condensate freezes in the line, or if line is
obstructed in any other manner, condensate can exit from the tee, resulting in potential water damage to property.
NOTE: To allow for proper drainage on larger horizontal condensate runs, tubing size may need to increase to 1 inch and a second line
vent may be required.
E. EXHAUST VENT AND INTAKE PIPE SIZING
1. The exhaust vent and intake pipe are 3” for the Elite EL-80/110/155/220 and 4” for the EL-299/301/399.
2. The total equivalent length of exhaust vent and intake pipe should not exceed 200 feet.
a. The equivalent length of friction loss in elbows, tees, and other fittings are listed in Table 10.
FRICTION LOSS EQUIVALENT FOR STAINLESS OR PLASTIC PIPING AND FITTINGS
FITTING DESCRIPTION 2” 3” 4” 6”
90
o
elbow short radius 5’ 5’ 5’ 3’
90
o
elbow long radius 4’ 4’ 4’ 3’
45
o
elbow 3’ 3’ 3’ 2’
Coupling 0’ 0’ 0’ 0’
Tee (intake only) 0’ 0’ 0’ 0’
V Series Vent Kit 1’ 1’ 1’ 1’
AL20 4C Vent Terminal 1’ 1’ 1’ 1’
Pipe (All Materials) 1’ 1’ 1’ 1’
Table 10 *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 exhaust vent is 3” in diameter, and has two short
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 short 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.
Therefore, the total equivalent length equals 43 feet.
c. The minimum total equivalent length is 16 feet.
d. The size of venting can also be reduced in order
to accommodate existing vent sizes. When reducing down to a 2” vent
from a 3” vent on Elite EL-80/110/155/220 models, or a 3” vent from a 4” vent on EL-299/301/399, the total equivalent length
shall not exceed 100 equivalent feet. Vent reduction must begin at the boiler.
F. LONGER VENT RUNS
The maximum total equivalent length can be extended by equally increasing the diameter of both the exhaust vent and intake pipes.
However, the transitions should begin a minimum of 16 total equivalent feet from the boiler.
Figure 13