Pressure Relief Valve; Expansion Tank And Make-Up Water - UTICA BOILERS UB90-50 Installation Manual

Figure 5 - Single Zone Boiler Piping
B. Pressure Relief Valve
The boiler is furnished with a factory installed relief valve in
the top of the boiler. Provide ¾" piping from the supplied
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 relief valve and the boiler, or on the discharge
pipes between such safety valve and the atmosphere. Instal-
lation of the safety relief valve shall conform to ANSI/ASME
Boiler and Pressure Vessel Code, Section IV. The manufacturer
is not responsible for any water damage.
NEAR BOILER PIPING
C. Expansion Tank And Make-Up Water
Determine required system fill pressure, system design tem-
perature, 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 and Figure #7
for conventional closed type expansion tanks. For diaphragm
type expansion tanks, adjust the tank air pressure to match the
system fill pressure. Install air vent (furnished) as shown for
diaphragm type expansion tank system only. Install make-
up water connections as shown 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 water
supply is from a well or pump, sand strainer should be installed
at the pump.
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