Dunkirk DWB Series - Manual (Page 12)

12
WARNING
Burn and Scald Hazard. Safety relief vlave
could discharge steam or hot water during
operation. Install discharge piping per these
instructions. Failure to do so could result in
death or serious injury.
!
5.4 Safety Relief Valve
NOTICE
Boiler rated at 43.5 psig (.30MPa) maximum allowable
working pressure. Boiler provided with 30 psig
(.21MPa) safety relief valve.
• Install safety relief valve 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 8.
• Use ¾” 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 and properly drain
piping.
• 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).
5 - HYDRONIC PIPING
Figure 7 - Safety Relief Valve & Air Vent
(Viewed from front of boiler)
1” MPT
Coupling 1” NPT
Nipple 1” x 5”
Tee 1” x 1” x ¾”
Safety Relief
Valve
Street Elbow ¾”