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A. Installation Instructions
1) Place the boiler on a level floor, preferably raised and as close to the chimney as possible.
The boiler must be installed on a non-combustible surface. The minimum clearances for
installation are shown below. Reduced clearance installations must follow NFPA-31
guidelines. If the boiler is a Knock Down (not packaged for ease of installation), install the
jacket in accordance with the directions provided in the jacket package, prior to piping.
Standard Clearances
Front 24”
Sides 6”
Rear 6”
Chimney Connector 18”
WARNING: The boiler must be installed on a non-combustible surface or fire may result.
2) Install the boiler piping. For location of piping refer to the Installation Drawing.
DANGER: Boilers with tankless coils must be piped in accordance with the piping diagram
including installation of a tempering or mixing valve. Domestic hot water temperatures
exceeding 125°F will cause severe burns instantly or death by scalding.
WARNING: Relief valve discharges and drain valve piping must be piped to a safe place of
discharge.
NOTICE: S Series Boilers are provided with a built-in air scoop feature. This feature allows
quiet, air free operation of the hot water system by eliminating air pockets without installa-
tion of air scoops. The supply line tapping in the top of the boiler extends approximately 1
inch below the top of the boiler, allowing only air-free water to enter the heating system
supply. Any air trapped in the top of the boiler is purged through the 3/4” vent tapping.
The 3/4” vent tapping should be connected to an automatic float vent, a manual vent or
piped to a conventional expansion tank. See Appendix B for illustration.
3) Packaged boilers are shipped with the burner, aquastat and circulator installed and wired at
the factory. See the Basic Wiring Diagram for wiring schematic. See component manufac-
turer’s manual for wiring instructions.
4) An expansion tank, not provided, must be matched to the system and installed in accor-
dance with the manufacturer’s instructions. Do not undersize the expansion tank. An
automatic feed and pressure reducing valve, not provided, should be installed in the water
inlet line to keep the entire system from falling below the pressure setting of the valve (
about 12 psi) See the feed valve suppliers instructions for maximum allowed water supply
pressure and requirements for pressure reducers. For piping and wiring of other system
components see the manufacturer’s installation manuals.
5) The tank-less water heater may be piped as shown in the Installation Drawing. A mixing
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