Multiple Boiler Installations - Weil-McLain Series 2 Manual

® S
ERIES

Multiple boiler installations

Figure 59 Side-to-side mounting of multiple ECO boilers
Placing multiple boilers
1. Locate multiple boilers with spacings shown in Figure 59 .
2. Provide indicated clearances around boilers for access and
servicing. If recommended dimensions are not possible,
provide at least the minimum clearances given on page 9 .
Also follow local codes.
3. Provide a minimum 30-inch walkway in front of the boilers
to ensure accessibility.
4. Uncrate, assemble and mount boilers according to
instructions in this manual.
5. Provide clearance for installation of venting, air piping,
gas piping, expansion tank, primary circulator and other
accessories.
Manifolded combustion air option
1. Multiple ECO boilers can use a common combustion air
manifold.
a. Provide minimum clearance to adjacent vents and
grade/snow line as shown in Figure 60 .
b. Provide minimum free area in duct (adjusted for louver
restriction) of 1 square inch per 2,000 Btuh
boiler input (or see Figure 133, page 128 ).
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.
DO NOT use common venting — the manifold
option is only for combustion air — all vent pipes
must be routed and terminated individually as
described in this manual.
See Figure 133, page 128 for minimum cross sectional area of
combined air ducts.
54
2
-
G
AS FIRED WATER BOILER
total
— Boiler Manual
Calculate required cross section (for area in square
inches):
MIN. AREA = TOTAL MBH INPUT DIVIDED BY 2
Example: A multiple boiler system with (6) ECO
155 boilers has a total input of 6 x 155 =
(930,000 Btuh). The required duct cross sectional area
is:
MIN. AREA = 930 DIVIDED BY 2 = 465 sq. inches
Figure 60 Manifolded combustion air option
— OR —
930
Part number 550-142-190/1218
MBH