Table of Contents
Advertisement
POWERVT@WATER
HEATER
VEN"nNG INSTRUCTIONS
VENT SIZING
,
The POWER
~
is designed for operation with a
"positive pressure vent system" constructed of
4"
schedule 40 CPVC pipe. If 4" pipe is difficult to
obtain
locally,
a
larger
diameter
tidY
be
substituted.
CAUTION: DO NOT use ABS or PVC pipe
in the venting system.
A8S
can emit
,toxic fumes in the event of a bliilding
fire, and PVC is not temperature rated
for this appliance.
"
VENT SYSTEM DESIGN
The POWER
W
can
be
vented either vertically
I
through a ceiling or roof, or horizontally through a
wall. From the vent pipe at the blower outlet, the
vent can be routed in any direction except down.
Like any closed piping system, the vent'should
maintain a downward slope toward the heater of
at least
X
inch per lirieal foot of horizontal vent
run to allow proper drainage of any accumulated
moisture. Despite this flexibility, the following
limitations and precautions must be observed.
Determination of Equivalent Length
Maximum equivalent length of vent must not
exceed the length identified in Table
19-1:
Vent
Equivalent length
Maximum Vent
Pipe
Length
90°
45°
1000
All
elbow
elbow
MBtu
others
4
14
5
50
·100
5
15
6
150
300
6
17
7
390
,:'500
Table 19-1
A. Add the total length of straight pipe (in fciet).
B. Multiply the number of 90° elbows used in
vent system \ by the equivalent length of
straight pipe specified in Table 19-1.
C. MUltiply the number of
45°
elbows used in
vent system by the equivalent length of
straight pipe specified in Table 19-1.
D. Add (A), (B) and (C) together to obtain the
total feet of venting. This length must not
exceed the maximum vent length identified in
Table
19-1.
Example:
A 4"
venting system of
25
ft. of straight
pipe and two
90°
elbows.
• Total straight pipe
=
20
feet.
• Number of elbows (2) x 14
=
28 equivalent feet
of straight pipe.
.
• 20
feet plus
28
feet
=
48
equivalent feet of
venting.
This is an acceptable vent system.
Horizontal Venting Through a Wall
The vent must extend one foot beyond the wall.
The vent must be terminated with the UL listed
vent termination provided by PVI.
The vent must not exit over a pUblic walkway or
over any other area where condensate or vapor
could be hazardous.
The vent must discharge at least three feet above
grade of the level of normal snow accumulation.
The vent must terminate at least four feet below,
four feet horizontally from, or one foot above any,
building air inlet including doors and windows.
Vertical Venting Through
a
Roof
•
The vent must extend upwards beyond nearby
obstructions in accordance with Figures
19-2
and
19-3
(see page
7).
•
The vent must be terminated with the UL listed
venttermination provided by PVI.
Venting of Multiple Units
•
MUltiple POWER ~ models must not
be
vented into a common duct or breeching. Each .
unit
must
be
independently
vented
in
accordance with the instructions for either
horizontal or vertical venting included above.
PV500-19
04-2005
5
Section 19
Advertisement
Table of Contents
