Crown Boiler Phantom X series, Installation And Operating Instructions Manual, Page: 44 / 136

44
VI. Water Piping and Trim
(continued)
C. Standard Installation Requirements.
Observe the following guidelines when making the
actual installation of the boiler piping:
1. Safety Relief Valve (Required)
– The safety
relief valve is packaged loose with boiler and must
be installed in the location shown in Figure 25 or
26 “Factory Supplied Piping and Trim Installation”.
The safety relief valve must be installed with spindle
in vertical position. Installation of the safety relief
valve must comply with ASME Boiler and Pressure
Vessel Code, Section IV. The standard factory
shipped safety relief valve is set at 50 psi (340 kPa)
on PHNTM399C and PHNTM500C. If the safety
relief valve is to be replaced, the replacement valve
must have a relief capacity equal or exceeding the
minimum relief valve capacity shown on the heat
exchanger ASME plate. Also, when replacing
the safety relief valve, verify the temperature and
pressure gage meets ASME requirements for the
replacement safety relief valve. Pipe the safety
relief valve discharge to a location where hot water
or steam will not create hazard or property damage
if the valve opens.
The end of the discharge pipe must terminate in an
unthreaded pipe. If the safety relief valve is not
piped to a drain, it must terminate at least 6 in. (150
mm) above the floor. Do not run safety relief valve
discharge piping through an area prone to freezing.
The termination of discharge piping must be in an
area where it will not become plugged by debris.
CAUTION
Burn Hazard. Safety relief valve discharge
piping must be piped such that the potential of
severe burns is eliminated. DO NOT pipe in any
area where freezing could occur. DO NOT install
any shut-off valves, plugs or caps. Consult local
codes for proper discharge piping arrangement.
2. Flow Switch (Required)
– A flow switch is
required in lieu of manual reset low water cutoff
(LWCO) for forced circulation coil-type water
boilers to prevent overheating and heat exchanger
failure in accordance with requirements of ASME
Boiler and Pressure Vessel Code, Section IV, and
ANSI/ASME CSD-1 – latest edition, “Controls and
Safety Devices for Automatically Fired Boilers”.
Figure 26: Factory Supplied Piping and Trim Installation - PHNTM500C