Emergency Shutdown; Prolonged Shutdown - Watts AERCO Edge CFR 3000 Operator's And 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
must be designed and implemented at the site:
•
For automatically operated unattended boilers located in a boiler room, 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, 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, an emergency
shutdown switch in the control room hard-wired to immediately shut off the fuel upon activation.

1.3 Prolonged Shutdown

In 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, follow the
instructions in Section 8.8 : Shutting Boiler Down for Extended Period.
When returning a unit to service after a prolonged shutdown, follow the instructions in Sections 4 and 5
to verify that all system-operating parameters are correct.
•
Figure 1-1: External Manual Gas Shutoff Valve
•
VALVE
OPEN
•