Pressure Relief Valve; Expansion Tank And Make-Up Water - Kenmore K90-50 Installation Instructions Manual

RELIEF VALVE
DISCHARGE
PIPING
FIGURE 5 RELIEF VALVE DISCHARGE 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. Installation 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.
C. EXPANSION TANK AND MAKE-UP WATER
Determine required system fill 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 Fig.6 for diaphragm type expansion tank and Fig.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 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 water supply
is from a well or pump, a sand strainer should be installed at the pump.
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