Harsco Industrial SC-2000 Installation & Owner's Manual page 29

3.7.3 Boiler Water Piping by Installer
Strainer
To avoid possible contamination of the boiler with dirt, rust or
sediment from the system, a strainer near the boiler inlet is strongly
recommended. Even new systems may contain sufficient foreign
material to eventually reduce the performance of the heat exchanger.
Adequate circulation of good clean water is essential for maximum
efficiency and long life of the boiler.
Relief Valve Piping
Each boiler must be supplied with pressure-relief valves sized in
accordance with ASME requirements. The relief valves must be
piped to an acceptable drain. Reducing couplings or other
restrictions are not permitted in the discharge line.
The SC-2000, SC-3000 and SC-4000 boilers require an ASME
Section IV relief valve to be installed on the top of the OUTLET
(Supply) connection. The spindle of the relief valve must be vertical.
The ASME Section IV relief valves are available for purchase from
Harsco Industrial, Patterson-Kelley.
The SC-3000 and SC-4000 boilers also require an ASME Section
VIII relief valve to be installed somewhere on the boiler or connecting
piping before any isolation valve(s). A side port on the OUTLET
(Supply) connection is available for this purpose.
Section VIII relief valve is provided with the SC-3000 and SC-4000
boilers for convenience.
Low Water Cut-off
The boiler is furnished with a probe-type low water cut-off; no field
piping is required. If the water level in the boiler drops below the
probe, the boiler will shut down and
will be displayed on the control panel. The low water cutoff circuit
will automatically reset when the low water condition clears;
however the boiler controls will retain the lockout condition until the
reset button on the display is depressed. Installation of external limit
controls may be required by certain codes or in certain installations.
Review applicable local codes for details.
Drain Valve and Piping
A drain valve is factory installed in the boiler inlet (system return)
piping. Prior to draining the boiler, electrical power and gas supply
must be turned off to the boiler, and the boiler must be isolated from
the system at the supply and return connections.
Condensate Drain
The condensate is acidic (pH between 3.0 and 5.0) and may be
corrosive to some building drain systems. A condensate
neutralization system may be required and is available from Harsco
Industrial, Patterson-Kelley. If the condensate drainage system is
exposed to freezing temperatures, it must be field heat traced. The
boiler could generate up to one gallon of condensate per 100,000
BTU input. As an example, an
40 gallons per hour of condensate!
Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.5351
LOCKOUT LOW WATER LEVEL
boiler at full fire can produce
SC-4000
29
N
OTICE
The low water cutoff probe only
allows boiler operation when the
water level in the boiler is
sufficient. It does not detect low
water conditions in other parts of
the system. Installation of
additional low water safety devices
to protect the system should be
considered.
N
OTICE
This drain valve is factory installed
for draining the boiler water only,
not the entire system. Draining of
the system through the boiler will
result in depositing sediment from
the system in the boiler which will
result in poor heat transfer
characteristics of the boiler and
early boiler failure.
The ASME
N
OTICE
Condensate Trap must be piped to
drain in accordance with all
national, state and local codes.
N
OTICE
Glycol or other treatment
chemicals added to the system
must be certified by the chemical
manufacturer for use in multi-metal
systems that include Stainless
Steel boilers.
N
OTICE
Under no circumstances should
petroleum based cleaning or
sealing compounds be used in the
boiler system.
N
OTICE
Under no circumstances should the
hydronic system be flushed while
the boiler is attached to the system
since the debris or corrosion
products could accumulate in the
boiler and plug the boiler's heat
exchanger.
Gas Fired Boiler
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