JFD KI40018AA, Руководство по эксплуатации и обслуживанию

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18
Chapter 3
KI-OM-6768 R0
3.1 G
ENERAL
The Divex Electric Powered Water Heating Module, WHE-03, has been designed to run with the
minimum amount of operator input. The temperature controller governs the process based on the
set point and feedback from the PT100 probe giving the measured output temperature (PV). The
operator is required to input the set point to the controller and switch on the appropriate heater
banks to provide the required capacity. (If applicable) when operating the WHE-3 from the remote
control panel, remote fine temperature control of the outlet water is achieved by adjusting the
temperature control knob. All other function and control will be selected and governed locally on the
WHE-3 unit.
Before running the unit the operator must determine the heating required for the divers. The
following steps outline the procedure for calculating the heating required.
The following information is needed:
• Approximate length of umbilical in water
• Approximate operating temperature of fluid desired at bottom (T
b
)
• Inlet water temperature (T
in
)
Step 1
– Determine outlet temperature.
Using the graph in Fig 3.1 to determine the temperature loss along the umbilical hose, select the
length of the umbilical hose on the vertical y-axis and move horizontally to the right until the line is
intersected then move vertically upward to the horizontal x-axis. The value on the x-axis will yield
the approximate temperature loss (T
loss
) through the specified length of umbilical.
Add the temperature loss through the umbilical to the temperature required at the diver. This will
give the total outlet temperature (T
out
) required. This value must be entered into the controller as
the control set point value (SV).
I
MPORTANT
Heater element selection and switching for temperature rise range must still take place
locally at the machine control panel. If a temperature set-point is selected on the remote
panel that is above the range of the heater element selection then the unit will close the
temperature control valve in an effort to achieve the required set-point but will have
insufficient heat input to achieve the set-point. Similarly if a set-point is selected that is
below the range of the heater element selection then the unit will fully open the
temperature control valve and may control temperature to some extent but massive
energy losses will be incurred due to excessive dumping of heated water.