Harsco Industrial C1500H Installation & Owner's Manual page 35

3.7.2 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 is supplied with a pressure-relief valve sized in accordance with ASME requirements. The relief valve
must be piped to an acceptable drain. Reducing couplings or other restrictions are not permitted in the discharge line.
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 LOCKOUT LOW WATER LEVEL 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.
NOTICE! The low water cutoff probe only prevents boiler operation when the water level in the boiler is insufficient.
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.
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.
NOTICE! This drain valve is factory installed for draining of 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.
Condensate Drain and piping
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.
NOTICE! Condensate must be trapped prior to being piped to the drain in accordance with all national, state and
local codes.
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, a MACH
boiler at full fire could produce 30 gallons per hour of condensate. It will be necessary to connect both the boiler
condensate drain and the vent condensate drain together, then loop the drain tubing creating a trap and drain into the
neutralization device, The neutralization device can then be drained into an appropriate drain. See illustrations below.
35
®
MACH Gas Fired Boiler
®
C3000