Chapter 4 - Boiler Piping; General Piping Requirements; Pressure Relief Valve; Fig. 5 - Pressure Relief Valve Installation - TriangleTube PRESTIGE Excellence 110 Installation & Maintenance Manual

CHAPTER 4 - BOILER PIPING

4.1.

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 components.
• Install unions for easy removal of the PRESTIGE Ex-
cellence from the system piping.
• If nonmetallic pipe is used in the system, it must
have a maximum oxygen diffusion rate of 0.1 mg/
liter per day.
WARNING
Use a two-wrench method when tightening
field piping onto the boiler piping connections.
Use one wrench to prevent the boiler connec-
tions from turning and the second to tighten
field piping. Failure to support the boiler pip-
ing connections could damage piping, causing
a leak, resulting in substantial property dam-
age, serious injury, or death.
Drain Piping Directed
Place of Drainage

Pressure Relief Valve

(Supplied with Boiler)
to a Suitable

Fig. 5 - Pressure Relief Valve Installation

4.2. 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 below.
2. To avoid potential water damage to the surround-
ing area or potential scalding hazard due to the op-
eration of the relief valve, the discharge piping:
• Must be connected to the discharge outlet 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 must not be reduced, main-
tain the same size as the outlet of the relief valve.
• Must be directed downward towards the floor
at all times. The piping should terminate at
least 6 inches [153 mm] above any drain con-
nection to allow clear visibility of the discharge.
• Must terminate with a plain end, not with a threaded
end. The material of the piping must have a service-
able temperature rating of 250ºF or greater.
• Must not be subject to conditions where freez-
ing could occur.
• Must not contain any shut-off valves or ob-
structions. No shut-off valve should be piped
between the boiler and relief valve.
WARNING
Failure to comply with the guidelines on
installing the pressure relief valve and dis-
charge piping can result in substantial prop-
erty damage, serious injury, or death.
3/4" Street Elbow
Air Vent
13