joule Thermalstore 1.0, Installation Manual

Page: 51 / 68

51
Where an immersion heater is fi tted, always check the immersion for signs of leak-
age before wiring commences.
The immersion heater must be completely submerged in water with a minimum of
200mm of water above the top of the immersion.
Wire the immersion through a double pole fused spur. The contact separation must
be no less than 3mm with a minimum breaking capacity of 16A.
Install the immersion using rigid cable, 2m long max, with 2.5 mm
2
cross-section
and a temperature resistance of at least 85°C.
The Cable should be rubber insulated HOFR sheathed, complying with BS6141
Table 8. It must be fully earthed. Ensure all terminal connections are securely made.
Do not however use excessive force when tightening the terminal screws.
Ensure that the power supply is disconnected prior to making any electrical con-
nections. Provide 90mm length of cable for each of the Live and Neutral cables with
8mm of bare cable for connection to the Immersion terminals.
Provide 110mm length of cable for the Earth cable with 20mm of bare cable for
connection to the Earth stud. Make a circle with the bare Earth cable and tighten
securely using the washer to the Earth stud. Fit the Live and Neutral cables to the
Immersion thermostat. Ensure all terminal connections are properly tightened prior
to commissioning.
For installations with high water demands, or areas with hard water, Titanium
immersions should be fi tted. The thermostat should be set so that the water is heat-
ed to a temperature between 60°C and 65°C. The immersion stat has an integrated
high limit stat which If the primary thermostat fails the limit thermostat takes over
and shuts the elemen
t off before the water can boil in the cylinder.
Warning: do not operate the immersion heaters until the
c
ylinder has been fi lled with water
When Installing An Immersion Heater