Safety Relief Valve And Air Vent; Trim Piping; System Piping - UTICA BOILERS MAHF-125 Installation, Operation & 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
Codes For
Maximum
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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240012565 REV A, [05/15/2019]