SERVICES
62
WATER TANK SENSORS AND PRESSURE SWITCH
Fresh level sensor & cleaning
Principle
The sensor, fitted to Swift Group caravans
are pre-fitted to water tanks, and link to
the fusebox, via a pre-fitted wiring harness.
The sensors, which consist of a number of
stainless steel rods or probes, at different
lengths, are immersed in the fresh water, and
use the conductivity of water, between the
probes, to provide a reading to the fusebox.
The sensors are 'digital', in that while the
conductivity (resistance) value can vary, the
fusebox will register any conductivity between
the reference probe and the various different
length probes, indicating water present.
Normally, even if the rods are dirty, and
providing the rods have not bridged by a
foreign object, a circuit will still be delivered
back to the fusebox and a water level
displayed.
Sensor cleaning
The first step, in case of fault diagnosis, is
to clean the sensor rods. False water level
reading at the control panel can be caused by
calcium build up or foreign objects within the
tank bridging the probes.
Sensor Cleaning Instructions
Cleaning recommendations for
lime scale build up:
1. Remove sensor from tank.
2. Check probes for build up or contamination.
3. Use clean soapy water.
4. Place scourer in water and dampen.
5. Apply scourer to sensor probe with limited
pressure.
6. Rub sensor probe removing contamination.
7. Swill sensor with fresh clean water.
8. Replace probe into tank.
Suggested scourers - food safe
Plastic mesh scourer
1. Material: It is made of plastic.
2. Usage: Used for cleaning steel utensils,
dishes, pots, pans, ovens, Bar-B-Que grills,
glass, cutlery,sinks, kitchen and bathroom
tiles and tubs etc.
Water pump pressure switch
The purpose of a pressure switch is to monitor
the pressure on the outlet side of the pump.
When a tap is closed, and the pump continues
to run, there is an increase of pressure in the
system, and when that pressure reaches a
pre-set limit, the pressure switch will turn the
pump off.
Water pump pressure
switch adjustment
Pressure Switch Adjustment, Truma/Flo-Jet
pump. (Normally Grey upper section with
White lower section/valve housing)
• All of the Truma/Flo-Jet pumps used by Swift
are pre-set at 28psi + / -3psi.
• To further adjust the pressure switch setting,
a cover cap must be first be removed from
the end of the pump to reveal a pressure
adjusting screw, as shown in the photos.
A maximum of 1/4 turn clockwise or
anti-clockwise, from the factory setting, is
advised. Turning the screw clockwise 1/4
turn will increase the pressure switch cut-out
pressure, turning the screw anti-clockwise
will reduce the pressure setting.
• Please note a second screw mounted
below the cover cap is set in position with
threadlock, this should not be disturbed.
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