Near Boiler Piping - Dunkirk Q95M-200 Installation Manual

IMPORTANT: For piping examples using the Gas-Fired Direct Vent Modulating Hot Water Boiler,
see the Piping Appendix in Section XIV of this manual.
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CAUTION
Copper supply and return piping must NOT be
installed directly into aluminum boiler section
castings due to galvanic corrosion between
dissimilar metals. Iron or steel bushings or
pipe nipples should be used between copper
system piping and boiler to make final con-
nection to boiler. Also, the use of dielectric
unions is acceptable. The packaged boiler is
furnished with iron piping where necessary
for the supply and return connections.
When the installation of the boiler is for a new
heating system, first install all of the radiation units
(panels, radiators, baseboard, or tubing) and the
supply and return mains. After all heating system
piping and components have been installed, make
final connection of the system piping to the boiler.
A hot water boiler installed above radiation level
must be equipped with a low water cut off device.
A periodic inspection is necessary, as is flushing
of float type devices, per low water cut off manu-
facturers specific instructions. This boiler is factory
equipped with a manual reset probe-type low water
cut off.
EXPANSION TANK AND MAKE-UP WATER
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CAUTION
Non-potable water only piped directly to
boiler.
Determine required system fill pressure, system
design temperature, and system water content.
Boiler contains 2.6 gallons (US). Size expansion
tank accordingly. Consult expansion tank manufac-
turer for proper sizing information. Connect prop-
erly sized expansion tank (not furnished) as shown
in Figure 6 for diaphragm type expansion tank. For
diaphragm type expansion tanks, adjust the tank
air pressure to match the system fill pressure. In-
stall air vent (furnished) as shown for diaphragm
type expansion tank system only. Install make-up
water connections as shown and per local codes.
If a pressure reducing valve is used, adjust to
match the system fill pressure. In connecting the
cold make-up water supply to the boiler, make sure
that clean water supply is available. When the wa-
VII - NEAR BOILER PIPING
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ter supply is from a well or pump, a sand strainer
should be installed at the pump.
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The boiler is furnished with a relief valve in the
boiler parts bag. Provide ¾" piping from the sup-
plied relief valve to a local floor drain, but leave
an air gap between piping and drain. No shutoff of
any description shall be placed between safety re-
lief valve and the boiler, or on the discharge pipes
10
Figure 6 - Diaphragm Type
Expansion Tank Piping
PRESSURE RELIEF VALVE /
TEMPERATURE PRESSURE GAUGE
Figure 7 - Relief Valve Discharge Piping