Safety Relief Valve And Air Vent; Trim Piping; System Piping - UTICA BOILERS MAHF-165 Installation, Operation And Maintenance Manual

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. Install discharge
piping per these instructions.
NOTICE
When installing safety relief valve it must be installed
in a vertical position with spindle at top.

6.3 Safety Relief Valve and Air Vent

• Install safety relief valve using pipe fitting provided
with boiler. See Figure 6-1.
• 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).

6.4 Trim Piping

• Temperature - Pressure Gauge. Install temperature
pressure gauge in near boiler piping on supply side.
• Some boiler models may have integral drain valve located
inside jacket directly underneath pump. Install external
drain valve as required.
6 - HYDRONIC PIPING
FIGURE 6-1 Safety Relief Valve
Safety Relief
Valve
Do not use
plastic pipe see
Warning above.
Check Local Check Local
Codes For Codes For
Maximum Maximum
Distance To Floor Distance To Floor

6.5 System Piping

• See Figure 6-6 for basic system piping configurations.
• Systems with automatic fill valves require back flow
prevention device.
• Single boiler system. See Figures 6-5, 6-6, for general
guidance. Additional considerations:
• Boiler control only supports integrated pump. Installer
responsible for integration of multiple central heating
pumps using field supplied external control.
• Boiler control allows domestic hot water
prioritization.
• Thoroughly flush all hydronic piping.
• Secure all valves/fittings to boiler.
• Route pressure relief valve discharge piping to the floor.
Follow local code with respect to necessary distance to the
floor. See Figure 6-1.
• Verify all drain valves are closed.
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240012874 REV A, [01/31/2020]