Emergency Shutdown; Prolonged Shutdown - Watts Aerco Benchmark OMM-0117 Operation And Maintenance Manual

Benchmark 5000-6000 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
4.12: Shutting Boiler Down For Extended Period of this manual, and review the procedures in
Appendix J at the end 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 5000 – 6000 Installation and Startup
Guide, OMM-0117 (GF-202) be performed to verify that all system-operating parameters are
correct.
OMM-0118_B • GF-203 • 5/9/2019
Figure 1-1: Manual Gas Shutoff Valve
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VALVE
OPEN
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