Emergency Shutdown; Prolonged Shutdown - Watts Aerco Benchmark 5000 Reference Manual

Benchmark with Edge [I] Controller: Reference 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 AERCO 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 8.12: Shutting Boiler Down For Extended Period in the
750-6000 with Edge [i] Operation-Maintenance Manual (OMM-0145, GF-218).
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 of the
Benchmark 750-6000 with Edge [i] Operation-Maintenance Manual (OMM-0145, GF-218)
be performed to verify that all system-operating parameters are correct. (This page intentionally
blank)
OMM-0146_A • GF-219 • 5/25/2020
Figure 1-1: Manual Gas Shutoff Valve
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VALVE
OPEN
Benchmark
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