Lennox GCWB95W-150 Installation Instructions

26
240012994 Rev. B [08/31/2020]
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
• Install safety relief valve using pipe tting provided
with boiler. See Figure 6-2.
• Install safety relief valve with spindle in vertical
position.
• Do not install shuto 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).
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
inhibited propylene glycol solutions certied by uid
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 ow control valves or other automatic means
to prevent gravity circulation of boiler water during
cooling cycle.
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.

Lennox GCWB95W-150 Specifications

General

Brand	Lennox
Model	GCWB95W-150
Category	Boiler
Language	English