21
Immersion Heater(s)
The Andrews Flexistor can be fitted with a selection of single phase and three phase immersion
heaters (see Table 7, page 9 and element allocation Table 9, page 10 for details). The immersion
heaters must be installed in accordance with the installation instructions supplied with the
immersion heater (supplied separately)
Warning: Before starting any work on the commercial immersion heaters switch off all electrical
supplies to such immersion heaters including thermostatic controls, these may be on a separate
circuit.
To remove the immersion heater:
Drain down the cylinder before any work is carried out on the Immersion heaters. Remove the
immersion heater cover and disconnect all wiring from the immersion and thermostatic controls.
Remove the 8 nuts (or bolts) and withdraw the immersion heater from the cylinder. Take care
when lifting the immersion out of the cylinder and work within safe working practices.
Replacement:
Make sure the Immersion heater gasket face is clean and if necessary replace the gasket (spare
part number 95607396). Replace the Immersion heater and make sure the 8 nuts (or bolts) are
correctly torqued (20Nm or 14.75 ft/lb) as per the Commercial Immersion heater fitting instructions
(36006161). Wire up the immersion heater as per Fig 5 or Fig 6, page 11 or Andrews Flexistor
immersion heater fitting instructions. Refill the cylinder and check for leaks. Turn on the supply and
set the thermostat temperature to the desired water temperature (60°C - 65°C is recommended).
NOTE: If using fibre gaskets they should be pre-soaked in ambient temperature water
for 30 mins before installation and the 8 securing nuts are diametrically tightened to 20
Nm or 0.42psi. White silicone gaskets can be fitted directly.
Wiring (See Figures 4, 5 & 6)
All electrical wiring should be carried out by a competent electrician and be in accordance with the
latest I.E.E. Wiring Regulations BS 7671.
DO NOT OPERATE THE IMMERSION HEATER(S) UNTIL THE Andrews Flexistor HAS BEEN
FILLED WITH WATER.
Operation
See Fig 4, page 10 for details on how to adjust the temperature setting of the heater.
DO NOT BYPASS THE THERMAL CUT-OUT IN ANY CIRCUMSTANCES.
Summary of Contents for Flexistor 1000
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