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PAGE 8
2472 DI HEATER OPERATION / MAINTENANCE MANUAL
2.4 EMERGENCY OFF (EMO)
The EMERGENCY OFF button (EMO) is located on the front of the
Control Panel. When the EMO circuit is activated by pushing button in,
the equipment will be placed into a safe shutdown condition. The EMO
circuit de-energizes all electrical control power to the equipment. Only
the supply voltage and supply to EMO switch are energized when the
EMO is in the OFF position.
Figure 2-3
2.5 LOCKOUT / TAGOUT
2.5.a Preliminary
Before installation or servicing the DI water heater, the facility’s circuit
breaker or power source must be de-energized to prevent serious injury
to personnel and equipment. An authorized employee representing the
facility installing the DI water heater must follow approved company
guidelines and lockout or use suitable means to prevent re-energizing the
electrical system during installation or servicing.
2.5.b Definitions
Lockout:
the placement of a lockout device on an energy isolating
device, in accordance with established company procedures, ensuring
that the energy isolating device and the equipment being controlled
cannot be operated until the lockout device is removed.
Tagout:
a prominent warning device such as a tag and a means of
attachment, which can be securely fastened to an energy isolating device
in accordance with established company procedure, to indicate that the
energy isolated device and the equipment being controlled may not be re-
energized or operated until the tagout device is removed.
A simple Lockout device is provided with each system. The Lockout is
tethered to the main circuit breaker.
Always perform an electrical de-energization test before and after
installation of the Lockout device by verifying the circuit breaker
properly isolates the line voltage from the system.
