Special Conditions; Safety Relief Valve And Air Vent - UTICA BOILERS MAH-125 Installation, Operation And Maintenance Manual

FIGURE 5-2 Safety Relief Valve Discharge Piping
Safety Relief Valve
Do not use
plastic pipe see
Warning below.
Check Local Codes For
Maximum Distance To Floor
!
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.
5 - HYDRONIC PIPING

5.2 Special Conditions

Note
• System piping exposed to freezing conditions: Use
inhibited propylene glycol solutions certified by fluid
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.
Install flow control valves or other automatic means
to prevent gravity circulation of boiler water during
cooling cycle.
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.

5.3 Safety Relief Valve and Air Vent

• Install safety relief valve using pipe fitting provided
with boiler. See Figure 5-2.
• 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. 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).
16
Do not expose boiler and condensate piping to
freezing temperatures.
!
WARNING
240011941 REV B, [03/31/2018]