FITTING AN ELECTRIC IMMERSION HEATER
Before fitting the immersion heater,
check that your a.c. supply voltage
corresponds to that indicated on the
immersion heater. Remove the dummy
boss from the calorifier.
AVOID LEAKS - make sure all surfaces
are clean! Clean the seating surface on
the calorifier boss, and the screw
threads on the boss and the immersion
heater. Lightly coat the ‘O’ ring and
threads on the calorifier and immersion
heater with silicone grease.
Screw in the heater. Remove the heater
cover, bend the cable to one side, fit a
2¼” box spanner over the hexagonal
base of the heater, and tighten
carefully.
To make the electrical connections,
follow the wiring instructions on page 13.
The use of a standard domestic
immersion heater with a single
thermostat is not recommended.
A Cleghorn Waring double-protected immersion heater, fitted with a high-
temperature cut-out in addition to the control thermostat, is strongly
recommended. Should the control thermostat fail, the high-temperature cut-
out will isolate the immersion heater when the water temperature reaches 90°C.
Thermostat Settings
The control thermostat on the immersion
heater is pre-set to cut out when the
water temperature reaches 60°C. This is
ample for domestic use. In an attempt
to reduce the likelihood of scalding, we
recommend that the control thermostat
is set no higher than 65ºC
The high temperature cut-out thermostat
is adjustable up to a maximum of 85°C.
It is pre-set to 85°C.
Check the thermostat settings before
using your immersion heater for the first
time. Isolate the immersion heater from
its power supply before removing the
cover. If necessary adjust the control
thermostat setting by turning the dial
with a screwdriver blade until the arrow
points to the desired temperature.
DO NOT set the high temperature cut-
out to operate below the cut-out
temperature of the control thermostat.
CONTROL THERMOSTAT DIAL
40ºC = 104ºF
50ºC = 122ºF
60ºC = 140ºF
70ºC = 158ºF
80ºC = 176ºF
Screwdriver Slot
In the event of a high temperature cut-
out the system should be thoroughly
checked before the manual re-set
button is pushed. It is advisable to
replace the control thermostat before
the immersion heater is used again.
Contact your supplier for a replacement
thermostat.
12
