7.3 Safety Relief Valve / Temperature Pressure Gauge Figure 2 - Safety Relief Valve Discharge Piping
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.
Safety Relief Valve
/
Installation of (supplied) safety relief valve shall conform to
ANSI/ASME Boiler and Pressure Vessel Code, Section IV.
• Install furnished safety relief valve using 3/4" pipe
fittings provided with boiler. See Figure 2.
• 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
Figure 2.
• Use 3/4"or larger pipe.
• Use pipe suitable for temperatures of 375°F (191°C) or
greater.
• Individual boiler discharge piping shall be independent
of other discharge piping.
• Size and arrange discharge piping to avoid reducing
safety relief valve relieving capacity below minimum
relief valve capacity stated on rating plate.
• Run pipe as short and straight as possible to location
protecting user from scalding.
• Install union, if used, close to safety relief valve outlet.
• Install elbow(s), if used, close to safety relief valve
outlet and downstream of union (if used).
• Terminate pipe with plain end (not threaded).
Check local codes
for maximum
distance from
floor.
FLOOR
Figure 3 - Diaphragm Type Expansion Tank Piping
7.4 Expansion Tank & Hake-up Water
• 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 manufacturer for proper sizing
information. Connect properly sized expansion tank
(not furnished) as shown in Figure 3 for diaphragm
type expansion tank.
• Adjust tank air pressure on diaphragm type expansion
tanks to match system fill pressure.
• Install air vent (furnished) as shown for diaphragm
type expansion tank system only.
• Install make-up water connections as show.
• If pressure reducing valve is used, adjust to match
system fill pressure.
• Verify clean water supply is available when connecting
cold make-up water supply to boiler.
• Use sand strainer at pump if water supply is from well
or pump.
AIR SCOOP
SUPPLY PIPING
PRESSURE
REDUCING VALVE
BACKFLOW PREVENTER
GATE VALVE
EXPANSION TANK
FEED
WATER
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