Specifications

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4.1 IMMERSION HEATER(S)
The Premier Plus SystemFit is supplied with a factory tted immersion heater which can be
used as an alternative heat source should the boiler supply need to be isolated from the unit.
The immersion heater is located within the indirect controls housing. The immersion heater is
rated 3kW at 240V (2.7kW at 230V). 210 litre models and above are supplied with a second
blanked off boss which can be used for the connection of a second immersion heater should
this be required.
To remove the blanking plug:
Open the cover to the upper immersion heater boss. The cover is secured by a cross-headed
screw. Unscrew brass backnut using the key spanner provided with the unit. Remove the
blanking plate and sealing gasket from the boss.
Fitting the additional immersion heater (where required order Part No. 95 970 510):
Insert the immersion heater and sealing gasket into the boss. Ensure that the sealing gasket is
not displaced when inserting. It may be helpful to support the immersion heater using a round
bladed screwdriver inserted into one of the thermostat pockets. Hand tighten the brass backnut.
Secure the immersion heater in position by tightening with the key spanner provided.
4.2 WIRING (see Diagram 6)
All electrical wiring should be carried out by a competent electrician and be in accordance with
the latest I.E.E. Wiring Regulations. Each circuit must be protected by a suitable fuse
and double pole isolating switch with a contact separation of at least 3mm in
both poles.
The immersion heater(s) should be wired in accordance with Diagram 6. The Live and Neutral
conductors should be connected directly to the combined thermostat/thermal cut-out to the ter-
minals marked A and B. The immersion heaters MUST be earthed. The supply cable should
be 1.5mm
2
3 core HOFR sheathed and must be routed through either the cable grip provided
(lower housing) or the cable gland provided (upper housing 210 litre units and above only) with
the outer sheath of the cable rmly secured by tightening either the top bar of the cable grip or
the screws on the cable gland. Replace the housing cover(s) before operating. On the upper
housing (210 litre and above only) ensure that the threaded edge clip is in position to provide a
suitable thread for the cover screw.
DO NOT operate the immersion heater(s) until the Premier Plus SystemFit has been lled
with water.
4.3 OPERATION
It is recommended that the immersion heater thermostats are set to between position 4 and 5
(60
o
- 65
o
C), however they can be set between 1 and 5 (10
o
and 70
o
C). The thermostat incor-
porates a thermal cut-out that will switch off the immersion heater in the event of a thermostat
failure. The thermal cut-out reset button position is indicated on Diagram 7. DO NOT bypass
the thermal cut-out in any circumstances.
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Installation - Direct Heating