Boiler Piping
SECTION IV - Boiler Piping
General Piping Requirements
- All plumbing must meet or exceed all local,
state and national plumbing codes.
- Support all piping using hangers. DO NOT
support piping by the unit or its components.
- Use isolation valves to isolate system com-
ponents.
- Install unions for easy removal of the
PRESTIGE Excellence from the system
piping.
- If plastic pipe is used for boiler piping, it
must have a maximum oxygen diffusion
rate of 0.1 mg/liter per day for boiler and
water heater protection.
Use a two wrench method when tighten-
ing piping onto the boiler connections.
Use one wrench to prevent the boiler
piping from turning / twisting. Failure
to support the boiler piping and connec-
tions in this manner could cause damage
to the boiler and its components.
Pressure Relief Valve
1. The PRESTIGE Excellence is supplied
with a 30 psi pressure relief valve and must
be piped using the PRV connection as
shown in Fig. 5 page 15.
2. To avoid potential water damage to the sur-
rounding area or potential scalding hazard
due to the operation of the relief valve, the
discharge piping:
- Must be connected to the discharge out-
let of the relief valve and directed to a
safe place of disposal.
- Length should be as short and direct as
possible. The size of the discharge line
should not be reduced, maintain the
same size as the outlet of the relief valve.
- Should be directed downward towards
the floor at all times. The piping should
terminate at least 6 inches [153 mm]
above any drain connection to allow
clear visibility of the discharge.
- Should terminate with a plain end, not
with a threaded end. The material of
the piping should have a serviceable
temperature rating of 250ºF or greater.
- Should not be subject to conditions
where freezing could occur.
- Should not contain any shut-off valves or
obstructions. No shut-off valve should be
piped between the boiler and relief valve.
Failure to comply with the guidelines on
installing the pressure relief valve and dis-
charge piping can result in personal injury,
death or substantial property damage.
Low Water Cutoff Device
- The PRESTIGE Excellence is equipped with
a factory installed pressure switch type Low
Water Cut Off device.
- The minimum operating system pressure
allowable with this device is 10 psig.
- Check local codes if a Low Water Cutoff
Device is required. If so, determine if this device
meets the requirements of the local codes.
The PRESTIGE Excellence control sys-
tem also senses the system water tempera-
tures entering and exiting the heat
exchanger to provide protection against
low water conditions Where local codes
and jurisdiction do not accept a pressure
device for low water protection, the juris-
dictions may accept these PRESTIGE
Excellence integral control functions as a
means of providing low water protection.
WARNING
WARNING
NOTICE
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