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SlimFit
Series 3
Multiple boiler installations
Placing multiple boilers
1. Locate multiple boilers in boiler room to provide the
clearances shown in:
a. Figure 3 (side-to-side), or
b. Figure 4 (back-to-back).
2. 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 SlimFit boiler manual. Also fol-
low applicable local codes.
3. 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 3 or 4.
4. Provide a minimum 30-inch walkway in front of the
boilers to ensure accessibility.
5. Uncrate, assemble and mount boilers according to
instructions in the SlimFit boiler manual.
6. 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.
Motorized air dampers
If the air openings are fitted with motorized dampers,
electrically interlock the damper to:
•
Prevent the boiler from firing if the damper is not fully
open.
•
Shut the boiler down should the damper close during
boiler operation.
To accomplish this interlock, wire an
(proving the damper open) in series with the thermostat
input to the boiler. The boiler will not start if this contact is
open, and will shut down should it open during operation.
Manifolded combustion air option
1. Multiple SlimFit boilers can use a common combustion
air manifold.
a. See Figure 99, page 110 of SlimFit Boiler Manual
for minimum cross sectional area of combined air
ducts.
b. Provide minimum clearance to adjacent vents and
grade/snow line as shown in Figure 31 of boiler
manual.
c. Provide minimum free area in duct (adjusted for
louver restriction) of
Btuh
total boiler input, or divide the total MBH
(1000's Btuh) by 2.
d. Example: For an MBS system with total input of
3,000,000 Btuh, or 3,000 MBH: Divide 3,000 by
2 = 1500 square inches minimum for a combined
air duct.
e. If combustion air damper is used, wire to boilers to
prevent operation except after damper has opened
(see Motorized air dampers, above).
– 6 –
&
&
isolated contact
1 square inch per 2,000
Advanced Manual
:
%
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.
Figure 3
Side-to-side mounting of multiple SlimFit boilers
Figure 4
Side-to-side mounting of multiple SlimFit boilers
Figure 5
Manifolded combustion air option
Part number 550-100-569/0321
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