Multiple Boiler Installations - Weil-McLain Eco Tec 2 Series Advanced Manual

®
ECO Tec series 2 gas-fired water boiler – advanced manual

Multiple boiler installations

Placing multiple boilers
1. Locate multiple boilers with spacings shown in Figure 4.
Provide the indicated clearances around boilers for access
and servicing.
If recommended dimensions are not possible,
provide at least the minimum clearances given
in the ECO Tec boiler manual. Also follow local
codes.
2. If boilers are floor-mounted, construct a boiler founda-
tion if boiler room floor is uneven or if there is a danger
of flooding. Size the foundation to allow for clearance and
spacing dimensions shown in Figure 4.
3. Provide a minimum 24-inch walkway in front of the boil-
ers to ensure accessibility.
4. Uncrate, assemble and mount boilers according to instruc-
tions in the ECO Tec boiler manual.
5. Provide clearances needed for installation of venting, air
piping, gas piping, expansion tank, primary circulator
and other accessories. Clearances must comply with all
applicable codes.
Manifolded combustion air option
1. Multiple ECO Tec boilers can use a common combustion
air manifold.
a. Provide minimum clearance to adjacent vents and
grade/snow line as shown in Figure 5.
b. Provide minimum free area in duct (adjusted for
louver restriction) of
total boiler input. See below. Also see information in
Boiler Ratings section of boiler manual.
c. If combustion air damper is used, wire to boilers to
prevent operation, except after damper has opened.
ONLY air piping can be combined. DO NOT
use combined vent piping. Flue gas leakage and
boiler component damage can occur. Failure to
comply could result in severe personal injury,
death or substantial property damage.
2. Calculate required cross sectional area of combined com-
bustion air duct (for area in square inches):
MINIMUM DUCT AREA
= TOTAL MBH INPUT DIVIDED BY 2
3. Example: A multiple boiler system with six (6)
ECO Tec 150 boilers has a total input of 6 x 150 =
MBH (900,000 Btuh). The required duct cross sectional
area would be:
MINIMUM DUCT AREA
= 900 DIVIDED BY 2
= 450 sq. inches
Part number 550-100-272/1021
1 square inch per 2,000 Btuh
900
Figure 4
Side-to-side mounting of multiple
Figure 5 Manifolded combustion air option
ECO Tec
boilers
– 7 –