JFD WHE - 3, Operation And Maintenance Manual

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KI-OM-0591 Rev 3 1
Introduction
1 Introduction
The JFD Electric Powered Water Heating Unit, (WHE-3), has been designed and
manufactured for use in professional diving systems. The WHE-3 with Remote Control
additionally allows the remote fine control of the outlet water temperature. It allows operator
manipulation of the temperature set point on the WHE-3 unit from a remote location, usually
dive control, through the use of a remote control panel hard wired to the main WHE-3 unit.
The system will control the heating of seawater within an inlet-to-outlet temperature rise range
of 0 to 50°C (32 to 122°F) with fine selectable remote control. The system incorporates a
positive displacement pump, electric heaters and all electrical controls necessary to provide a
complete water heating system for deep diving.
1.1 Basic Description
The WHE-3 assembly is comprised of a motor, pump, heater tank, pipe work and control
panel. These components are mounted into a robust stainless steel frame. The system
requires a constant supply of seawater and runs from a 440, 3 phase, 60 Hz or 380, 3 phase,
50 Hz power supply. The output is heated seawater at pressures up to 68 bar and 45 litres/
min.
The remote control panel of the WHE-3 is a 19” rack-mounted face plate comprising the
following:
• Fine Temperature Control Potentiometer
• Water Outlet Temperature Display
• Pump Run Indication
• General Fault Indication
• Emergency Stop Push Button
The remote control panel is supplied with the remote controlled WHE-3 unit as standard,
however a remote panel may be fitted to a standard WHE-3 with minimal modifications.
Note The temperature controller used in a remote controlled version of the WHE-3
differs to that of a standard WHE-3. The remote version makes use of a controller
with control set point input and a retransmission module to accommodate the
integration of the remote control panel.
1.2 Specifications
Shipping Weight 590 kg
Dry Weight 460 kg
Power Requirements AA, AC 440 VAC, 3 phase, 60 Hz, 180 kW, 240 to 260 A
AB 380 VAC, 3 phase, 50 Hz, 180 kW, 260 to 280 A
Input Fluid Fresh Water or Seawater
Input Pressure 3 to 10 bar
Input Flow 45 litres/min minimum
Output Pressure Up to 68 bar
Output Flow Up to 45 litres/min
Temperature Rise Control Range 0 to 50°C (32 to 122°F)