Emergency Shutdown; Prolonged Shutdown - Watts AERCO Benchmark OMM-0121 Operation And Maintenance Manual

Benchmark 750-3000 Boiler Operation & Maintenance Manual
SECTION 1: SAFETY PRECAUTIONS

1.2 EMERGENCY SHUTDOWN

If overheating occurs or the gas supply fails to shut off, close the manual gas shutoff valve
(Figure 1-1) located external to the unit.
NOTE:
The Installer must identify and indicate the location of the emergency shutdown manual gas
valve to operating personnel.
VALVE
CLOSED
In addition, to ensure safety an emergency shutdown procedure that addresses the following
points should be designed and implement at the site:
•
For automatically operated unattended boilers located in a boiler room, provide a manually
operated remote shutdown switch or circuit breaker located just inside or outside each boiler room
door. Design the system so activation of the emergency shutdown switch or circuit breaker will
immediately shut off the fuel supply to the unit(s).
•
For automatically operated unattended boilers in a location other than a boiler room, provide a
manually operated remote shutdown switch or circuit breaker marked for easy identification at a
location readily accessible in the event of boiler mis-operation.
•
Design the system so activation of the emergency shutdown switch or circuit breaker will
immediately shut off the fuel.
•
For boilers monitored and/or operated from a continuously occupied control room, provide an
emergency shutdown switch in the control room that is hard-wired to immediately shut off the fuel
upon activation.

1.3 PROLONGED SHUTDOWN

If there is an emergency, turn off the electrical power supply to the boiler and close the manual
gas valve located upstream the unit. The installer must identify the emergency shut-off device.
If the boiler needs to be shut down for a prolonged period, follow the instructions in Section
4.10: Shutting Boiler Down For Extended Period of this manual.
After prolonged shutdown, it is recommended that the procedures in Section 4: Initial Startup
and Section 5: Safety Device Testing of the Benchmark 750-3000 Installation and Startup Guide
(OMM-0121, GF-205) be performed to verify that all system-operating parameters are correct.
OMM-0122_D • GF-206 • 5/9/2019
Figure 1-1: Manual Gas Shutoff Valve
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VALVE
OPEN
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