Near Boiler Piping - UTICA BOILERS UB90-200 Installation, Operation & Maintenance Manual

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 fi nal
connection to boiler. Use of dielectric unions is
acceptable. Packaged boiler is furnished with
iron piping in front boiler section for supply
and return connections.
When installation of boiler is for new heating system, fi rst
install all of radiation units (panels, radiators, baseboard,
or tubing) and supply and return mains. After all heating
system piping and components have been installed, make
fi nal connection of system piping to boiler.
Hot water boiler installed above radiation level or as
required by authority having jurisdiction must be equipped
with low water cut off device (included with boiler). A
periodic inspection is necessary, as is fl ushing of fl oat
type devices, per low water cut off manufacturers specifi c
instructions.
Figure 6 - Diaphragm Type Expansion Tank Piping

NEAR BOILER PIPING

CAUTION
Expansion Tank And Make-Up Water
Determine required system fi ll pressure, system design
temperature, and system water content. Boiler contains
2.6 gallons (U.S.). Size expansion tank accordingly. Consult
expansion tank manufacturer for proper sizing information.
Connect properly 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 fi ll pressure. Install 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 fi ll pressure. In connecting the
cold make-up water supply to the boiler, make sure that
clean water supply is available. When the water supply is
from a well or pump, a sand strainer should be installed at
the pump.
Pressure Relief Valve / Temperature Pressure Gauge
The boiler is furnished with a relief valve and temperature
pressure gauge in the boiler parts bag.
• Install safety relief valve and air vent using pipe
fi ttings provided with boiler. See fi gure 7.
• Install safety relief valve with spindle in vertical
position.
• Do not install shutoff valve between boiler and safety
relief valve.
• Install discharge piping from safety relief valve. See
fi gure 5-2.
• Use ¾" or larger pipe.
• Use pipe suitable for temperatures of 375°F
(191°C) or greater.
Figure 7 - Relief Valve Discharge Piping
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