Emergency Shutdown; Prolonged Shutdown - Watts AERCO Benchmark BMK5000 Operation And Service Manual

Benchmark Platinum-Edge [ii]: Operation-Service Manual
SECTION 1: SAFETY PRECAUTIONS

1.2 EMERGENCY SHUTDOWN

If overheating occurs or the gas supply fails to shut off, close the manual 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 from the unit. The installer must identify the emergency shut-off
device.
If the unit is being shut down for an extended period of time, such as a year or more, complete
the instructions in Section 8.10: Shutting Boiler Down for Extended Period.
When returning a unit to service after a prolonged shutdown, it is recommended that the
instructions in Section 4: Initial Startup Procedures and Section 5: Safety Device Testing be
performed to verify that all system-operating parameters are correct.
.
OMM-0137_J •
12/20/2022
Figure 1-1: External Manual Gas Shutoff Valve
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VALVE
OPEN
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