ICP A Series User Manual

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Specifications subject to change without notice.
Venting System Length Calculations
The Total Equivalent Vent Length (TEVL) for EACH combustion air or vent pipe equals the length of the venting system, plus the equivalent
length of elbows used in the venting system from Table 14.
Standard vent terminations or factory accessory concentric vent terminations count for zero deduction.
See vent system manufacturer’s data for equivalent lengths of flexible vent pipe or other termination systems. DO NOT ASSUME that one
foot of flexible vent pipe equals one foot of straight PVC/ABS DWV vent pipe.
Compare the Total Equivalent Vent Length to the Maximum Equivalent Vent Lengths in Table 13.
Example 1
A direct-vent 60,000 BTUH furnace installed at 2100 ft. (640M). Venting system includes FOR EACH PIPE:
70 feet (22 M) of vent pipe, 65 feet (20 M) of combustion air inlet pipe, (3) 90º long-radius elbows, (2) 45º long-radius elbows, and a factory
accessory concentric vent kit.
Can this application use 2” (50 mm ND) PVC/ABS DWV vent piping?
Measure the required linear length of air inlet and
vent pipe; insert the longest of the two here
70
f
t.
(22 M)
Use length of the longer of the vent
or air inlet piping system
A
dd equiv length of (3) 90º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
3
x
3
f
t.
(0.9 M)
=
9
f
t.
(2.7 M)
From T able 14
A
dd equiv length of (2) 45º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
2
x
1.5
f
t.
(0.5 M)
=
3
f
t.
(0.9 M)
From T able 14
A
dd equiv length of factory concentric v ent term 0
f
t. From T able 14
A
dd correction for flexible vent pipe, if any 0
f
t.
From
V
ent Manufacturer’s
instructions; zero for PVC/ABS DWV
Total Equivalent Vent Length (TEVL)
82
f
t.
(25 M)
A
dd all of the above lines
Maximum Equivalent Vent Length (MEVL)
95
f
t.
(29 M)
For 2” pipe from T able 13
Is TEVL less than MEVL? YES Therefore, 2” pipe MAY be used
Example 2
A direct-vent 60,000 BTUH furnace installed at 2100 ft. (640M). Venting system includes FOR EACH PIPE:
100 feet (30 M) of vent pipe, 95 feet (29 M) of combustion air inlet pipe, (3) 90º long-radius elbows, and a polypropylene concentric vent kit.
Also includes 20 feet (6.1 M) of flexible polypropylene vent pipe, included within the 100 feet (30 M) of vent pipe.
VERIFY FROM POLYPROPYLENE VENT MANUFACTURER’S INSTRUCTIONS for the multiplier correction for flexible vent pipe.
Can this application use 60mm o.d. (2”) polypropylene vent piping? If not, what size piping can be used?
Measure the required linear length of RIGID air inlet and vent pipe; insert
the longest of the two here: 100 ft. Of rigid pipe --- 20 ft. Of flexible pipe
= 80
f
t.
(24 M)
Use length of the longer of the vent
or air inlet piping system
A
dd equiv length of (3) 90º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
3
x
5
f
t.
(1.5 M)
=
15
f
t.
(4.6 M)
Example from polypropylene vent
manufacturer’s instructions, Verify from vent
manufacturer’s instructions.
A
dd equiv length of 45º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
0
x
=
0
f
t.
(0 M)
A
dd equiv length of factory concentric v ent term 9
x
3.3
f
t
(0.9 M)
=
30
f
t.
(9 M)
A
dd correction for flexible vent pipe, if any 2*
x
20
f
t.
(6.1 M)
=
40
f
t.
(12.2 M)
* VERIFY FROM VENT MANUF
A
CTURER’S INSTRUCTIONS; For example only, assume 1 meter of
f
lexible 60mm (2”) or 80mm (3”)
polypropylene pipe equals 2.0 meters (6.5 ft.) of PVC/ABS pipe.
Total Equivalent Vent Length (TEVL)
165
f
t.
(50 M)
A
dd all of the above lines
Maximum Equivalent Vent Length (MEVL)
95
f
t.
(29 M)
For 2” pipe from T able 13
Is TEVL less than MEVL? NO
Therefore, 60mm (2”) pipe may NOT be
used; try 80mm (3”)
Maximum Equivalent Vent Length (MEVL)
185
f
t.
(57 M)
For 3” pipe from T able 13
Is TEVL less than MEVL? YES Therefore, 80mm (3”) pipe MAY be used

ICP A Series Specifications

General

Brand	ICP
Model	A Series
Category	Furnace
Language	English