13
iii. Pre-installation and Boiler Mounting
G. General (continued)
H.
Boiler Stacking
1. For installations with unusually high space heating
and/or domestic hot water heating loads, where
employing two (2) Apex (APX) boilers will offer the
benefits of greater operational efficiency, floor space
savings and boiler redundancy, the Apex (APX)
boilers may be installed stacked one on the top of
the other. Refer to Table 3 “Apex (APX) Boiler
Model Stacking Combinations” for details.
Table 3: apex (aPX) Boiler Model Stacking
Combinations
Bottom
Boiler Model
Top Boiler Model
APX399
APX399
APX500
APX399 or APX500
APX800
APX399, APX500 or APX800
2.
To field assemble individual Apex (APX) boilers
into a stackable configuration
, use the steps below:
a. Position the bottom boiler first. Refer to Sections
II “Unpacking Boiler” and III “Pre-Installation
& Boiler Mounting” of the manual for details.
Always position higher input boiler model as
bottom boiler
.
b. Each Apex (APX) boiler is factory packaged
with two (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” long screws, P/N
80860743]. Locate and remove the brackets and
the hardware. The Stacking Boiler Attachments
Bracket has three 7/32” diameter holes punched
in a triangular pattern. See Figure 3 “Stacking
Boiler Attachment Bracket Placement”.
c. Apex (APX) 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 (APX)
boiler model variable depth.
d. Position the upper boiler on the top of the bottom
boiler and align boiler front doors and sides flush
with each other.
• Place first Stacking Boiler Attachment
Bracket onto the upper boiler left side panel,
at the panel lower left corner and align
bracket two upper holes with corresponding
side panel lower dimples.
• The remaining lower bracket hole must align
with a matching bottom boiler left side panel
top positioning dimple.
• Once bracket holes and side panel dimple
alignment is verified, attach the bracket to
top and bottom boiler left side panels with
the mounting screws.
e. Repeat above procedure to install second
Stacking Boiler Attachment Bracket and secure
the stacked boiler right side panels together at
the front right corner.
f. Install the third Stacking Boiler Attachment
Bracket to secure top and bottom boiler left side
panels at the rear left corner. Align the bracket
holes with corresponding positioning dimples in
the top boiler and bottom boiler left side panels,
then secure bracket with the screws.
g. Repeat above procedure to install the forth
Stacking Boiler Attachment Bracket to secure
stacked boiler right side panels at the rear right
corner.
3.
When installing stackable boiler combinations
observe the following guidelines:
a. Venting - Top and bottom boilers must have their
individual vent piping and vent terminals.
Warning
no common manifolded venting is permitted.
For side-wall venting individual model vent
terminals must terminate not closer than 12
inches horizontally and three (3) feet vertically
from each other in order to prevent combustion
air contamination. For vertical through the roof
venting, individual vertical vent terminals, if
level with each other, must be spaced no closer
than 12 inches horizontally. If vertical terminals
cannot end in one plane, they must be spaced no
closer than three (3) feet horizontally.
Chimney chase concentric venting is permitted
for modules, when stackable, providing
concentric vertical (roof) vent terminals, if level
with each other, are spaced no closer then 12
inches horizontally.
If vertical vent terminals cannot end in one
plane, they must be spaced no closer then three
(3) feet horizontally.
Follow instructions in Section IV “Venting”
of the manual for specifics of individual boiler
vent termination. Follow instructions in Section
V “Condensate Disposal” for each individual
boiler flue gas condensate line construction and
condensate disposal. Terminating individual
boiler condensate lines into common pipe prior
to drain disposal is permissible, providing
common pipe has sufficient flow capacity
to handle combined condensate volume of
stackable combination.
Summary of Contents for Apex APX399
Page 65: ...65 VIII Electrical continued Figure 43 Ladder Diagram ...
Page 66: ...66 VIII Electrical continued ...
Page 67: ...67 Figure 44 Wiring Connections Diagram VIII Electrical continued ...
Page 110: ...110 1P 3 1P 2 1P 1 XIII Repair Parts continued 1C 1D 1E ...
Page 116: ...116 XIII Repair Parts continued ...
Page 118: ...118 XIII Repair Parts continued ...
Page 129: ...129 SERVICE RECORD DATE SERVICE PERFORMED ...
Page 130: ...130 SERVICE RECORD DATE SERVICE PERFORMED ...
