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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 specics of individual boiler vent
termination. Follow instructions in Section V for
each individual boiler ue 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 sufcient ow capacity to
handle combined condensate volume of stackable
combination.
2. Gas Piping - Follow instructions in Section VII “Gas
Piping” of the manual for sizing and installation
of an individual boiler. When common gas piping
is sized, insure it will have adequate capacity for
combined input (GPH gas ow) of the selected
stackable boiler combination.
3. Water Piping and Trim - Follow instructions in
Section VI “Water Piping and Trim” of the manual
for system piping and boiler secondary piping
selection/sizing based on combined heating
capacity and/or gross output of the selected
stackable boiler combination. Follow instructions
of Section VI for each individual boiler trim
installation.
4. Electrical - Follow instructions in Section VIII
“Electrical” of the manual to wire individual boilers.
Stackable boilers require a separate, installer
provided, staging control (Tekmar Model 265 or
equivalent) to operate the boilers. Follow control
manufacturer instructions to wire it to the boilers.
Figure 39: Stacking Boiler Attachment Bracket Placement