14) Refer to the Guide Sheet DIAGRAM C.
The depth sensor is a robust item but must not be subjected to excessive impact, crushing or stretching
of the attached cable. To avoid these occurrences it is the last item to be installed.
NOTES.
a) The Sensor cable is of a pre-ordered length, which you have checked upon receipt.
b) It is NOT advisable to extend this cable by jointing. If it is absolutely necessary you must ensure that any
joint is watertight and accessible.
c) There must be NO jointing of this cable in the tank turret.
d) Any use of cable not supplied by Envireau for the express purpose MUST be of a SIMILAR
specification. The minimum specification is 4 core (16/0.2mm per core, RED, YELLOW, GREEN, BLUE or
NUMBERED) screened by braid or SWA. The outer insulation MUST be rated at 240v RMS.
e) The screen or SWA must be EARTHED at the control unit end only and must be electrically continuous
with the screen on the sensor cable supplied.
To install the sensor, uncoil the cable fully and straighten on the ground surface. You are NOT advised to
cut the cable to length at this stage. It is important that this cable is not unduly stretched so lubricate if
necessary. Draw all the cable through the duct, along with another draw-wire (or rope) for future use if
necessary, until there is a minimum of three meters of cable in the tank turret. Do not leave excessive
unused cable coiled in the turret or chamber. It is a trip hazard. Be safe.
Do not lower the sensor into the tank at this stage. Secure the sensor temporarily to the fitted turret
bracket, out of the water.
Once the cable is through the duct it should be terminated in the Control Panel after cutting to length.
Discard the unused cable. The sensor cable cores should be connected in to the SENSOR terminal block.
This terminal block is below the display terminals, upper right (facing) on the PCB. The terminals are
marked R for the RED core, Y for the YELLOW core, Bu for the BLUE core and Gn for the GREEN core.
15) You have now completed the installation of your GRAVITY system. Before proceeding to the
final stage Set-up and Commissioning, you should check the following.
a) Are all pipe work joints secure?
b) Have you taken precautions to quickly isolate the electrical supply to the system?
c) Is the storage tank full (or at least half-full) of clean water, free from installation detritus?
d) Are you aware of the location of all items of equipment, particularly the display unit?
e) Have you completed the external plumbing to appliances?
Note. It is permissible to install a stop-cock within 0.5 meters of the outlet from the controller but there
should not be less than 3 meters of pipe work in total to the system appliance(s), including the header
tank, without the inclusion of a pressure vessel in the run.
10
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