31
WARNING
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.
!
FIGURE 6-2 Safety Relief Valve Discharge Piping
6 - HYDRONIC PIPING
6.3 Safety Relief Valve and Air Vent
•
with boiler. See Figure 6-2.
• Install safety relief valve with spindle in vertical
position.
•
relief valve.
• Install discharge piping from safety relief valve. Do not
use plastic pipe.
• Use ¾" or larger pipe.
• Use pipe suitable for temperatures of 375°F (191°C) or
greater. Do not use plastic pipe on safety relief valve.
• 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).
Check Local Codes For Check Local Codes For
Maximum Distance To FloorMaximum Distance To Floor
Safety Relief Valve
6.2 Special Conditions
Note
• System piping exposed to freezing conditions: Use
manufacturer for use with closed water heating system.
Do not use automotive or ethylene glycol.
• Boiler installed above radiation level (or as required
by authority having jurisdiction). Integral low water
pressure switch is provided in boiler.
• Boiler used in connection with refrigeration system.
Install piping in parallel with boiler, with appropriate
valves to prevent chilled medium from entering boiler.
• System piping connected to heating coils located in air
handling unit exposed to refrigerated air circulation.
to prevent gravity circulation of boiler water during
cooling cycle.
• Boiler used to provide heat to fan coil unit, which also
contains a refrigeration coil, precautions should taken
to prevent the hot water coil from freezing. Consider
items such as a freeze sensor on the hot water coil
and/or low ambient controls on the air conditioning
unit. It is manufacturer recommended to install a drip
pan whenever there is a risk of damage to the area
below a fan coil as a result of a water leak.
Do not use
plastic pipe see
Warning below.
WARNING
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Use pipe suitable for temperatures of 375°F (191°C) or
greater. DO NOT use plastic pipe.
!
Do not expose boiler and condensate piping to
freezing temperatures.
240013360
REV A [07/01/2021]
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