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Part number 550-100-260/0520
21
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
.
Install air inlet piping for the ECO
Tec boiler as
described in this manual.
The air termination fitting must be installed with
the clearances and geometry relative to the vent
outlet depicted in this manual to ensure that flue
products do not enter the air intake.
Ensure that the combustion air will not contain
any of the contaminants in Figure 25, page 20. Do
not pipe combustion air near a swimming pool, for
example. Avoid areas subject to exhaust fumes from
laundry facilities. These areas will always contain
contaminants.
Contaminated combustion air will damage
the boiler, resulting in possible severe personal
injury, death or substantial property damage.
Installing vent and air piping
For polypropylene applications, comply with
any additional requirements in the vent system
manufacturer’s instructions. 3" PP can be used for
vent and air connections. Install a locking collar at
every joint.
Provide 3" transitions at the boiler connections if
using 2" piping.
Refer to page 137 for a list of compliant adapters.
3" to 2" PP adapter must have smooth, straight
section of pipe to insert in to the boiler vent and
air connections and must fit and seal tightly. PP
adapters with their own seal which would interfere
with the internal seal of the boiler vent or air
connections must not be used.
Additional vent and air transition pieces at
termination may be required if different material
and/or size is used for termination.
For AL29-4C vent pipe applications, comply with
any additional requirements in the vent system
manufacturer’s instructions.
3" Simpson Duravent can be used at the vent
and air connections. All other stainless steel
manufacturer's venting will require a transition
piece as per manufacturer's recommendation when
transitioning from PVC to SS.
Additional vent and air transition pieces at
termination may be required if different material
and/or size is used for termination.
Provide 3" transitions at the boiler connections if
using 2" piping.
Refer to page 137 for a list of compliant adapters.
Venting/air piping — general
Venting with flexible polypropylene
Tests have determined that flex vent has a greater pressure drop
than rigid polypropylene vent which changes the maximum
allowable length of venting. Below are the equivalent lengths.
Supplier and Size of Flex Pipe Vent Length
- Equivalent
Duravent 2” diameter
1 foot equals 3.3 ft.
Duravent 3” diameter
1 foot equals 1.7 ft.
Centrotherm 2” diameter
1 foot equals 5.0 ft.
Centrotherm 3” diameter
1 foot equals 2.3 ft.
: Using 20 feet of Duravent 3”: 20’ x 1.7 = 34’ of
equivalent length of straight pipe
Knowing and identifying the correct equivalent length is
essential to ensure the proper operation of our high efficiency
boilers. The equivalent vent lengths for each specific size and
manufacturer of venting.
Calculated equivalent feet shall not exceed maximum values
listed in boiler manual.
All current boiler installations using polypropylene flex
venting with concerns/questions should contact Weil-Mclain
Technical Service for assistance, if our boiler is having
operation issues that may be related to excess vent lengths.
Code Compliance
Venting / Combustion air piping – Installations must provide
provisions for combustion and ventilation air in accordance
with the section “Venting of Equipment”, of the National
Fuel Gas Code, ANSI Z223.1 / NFPA 54 – latest edition,
or “Venting Systems and Air Supply for appliances” of the
Natural Gas and Propane Installation Code, CAN/CSA
B149.1, or applicable provisions of the local building codes.
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