World Leaders in Ultra-Pure Heating
Revision 10
www.heateflex.com
01/17/13
405 E. Santa Clara St.
Arcadia, CA 91006-7218
Tel: (626) 599-8566 Fax: (626) 599-9567
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4.8 Use of the Emergency Off (EMO) Switch
The most common problem encountered with hot D.I. water equipment and piping is leaking
due to the high degree of thermal expansion associated with the plastic materials used in this
application. In any case, a leaking condition on the unit, whether D.I. water or steam, or any
other serious safety hazard in most all cases can be remedied by depressing the Emergency Off
switch (EMO) on the electrical cabinet. This will immediately shut of the supply of D.I. water
and steam to the unit. In addition, the unit will be powered off.
Please note that closing the unit‟s steam supply inlet valve may not eliminate the shellside
pressure in the unit due to the backpressure from the user‟s condensate removal system unless
downstream valving is provided for by the user.
Also please note that D.I. water leaks downstream of the unit will not be affected by this action
as the unit is fitted with an automatic bypass-valve which is fail-safe open, meaning that as the
isolation valves close, the bypass valve will open passing cold D.I. water to the piping
downstream of the unit and to the process.
In addition, due to the presence of pressurized steam within the exchanger vessel, leaks on
either the process or steam side of the equipment will not be immediately remedied by the
EMO switch. Though the EMO will immediately reduce the volume of the leak and over a
period of a few seconds the effluent will be reduced in flow to zero.
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4.9 Door Interlock
The Fluidix unit is equipped and protected with a door interlock switch. This switch will
disable the unit from powering up when the control box is open. In addition, the unit will
completely shut down (there will be no steam supply and D.I. water supply to the unit) when
the door interlock switch is triggered.
Please make a note of the door interlock switch in
order to prevent unplanned shut down of the unit.
