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3
Pre-Installation and Boiler Mounting
Figure 3-3: Clearances To Combustible and Non-combustible Material
H. Boiler Stacking
1. For installations with unusually high space
heating and/or domestic hot water heating
loads, where employing multiple boilers
will offer the benefits of greater operational
efficiency, floor space savings and boiler
redundancy, boilers may be installed stacked
maximum one boiler on top of another. Refer
to Table 3-4 "Apex Boiler Model Stacking
Combinations" for details.
Table 3-4: Apex Boiler Model Stacking
Combinations
Bottom
Boiler Model
APX425C
APX425C
APX525C
APX425C or APX525C
APX625C
APX425C, APX525C or APX625C
APX725C
APX425C, APX525C, APX625C or APX725C
APX425C, APX525C, APX625C, APX725C or
APX825C
APX825C
2. To field assemble individual Apex boilers into a
stackable configuration, use the steps below:
a. Position the bottom boiler first. Refer to
Sections 2 "Unpacking Boiler" and 3 "Pre-
106308-05 - 3/23
Top Boiler Model
APEX
Installation, Operating, & Service Instructions
(continued)
Installation & Boiler Mounting" of the manual
for details. Always position higher input
boiler model as bottom boiler.
b. Each Apex boiler is factory packaged with
2 stacking boiler attachment brackets (P/N
101679-01) and the bracket mounting
hardware [six (6) self-drilling hex washer
head plated #8 x ½ in. long screws,
P/N 80860743]. Locate and remove the
brackets and the hardware. The stacking
boiler attachment bracket has three 7/32
in. diameter holes punched in a triangular
pattern. See Figure 3-5 "Stacking Boiler
Attachment Bracket Placement".
c. Apex boiler left and right side panels have a
series of dimples at panel top and bottom.
These dimples are positioning dimples
for stacking boiler attachment bracket
mounting screws. Side panel bottom
positioning dimples are evenly spaced from
boiler front and back, while side panel top
positioning dimples follow specific pattern
to compensate for Apex boiler model
variable depth.
11
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