Baxi 300i Manual page 20

Figure 12: Thermostat adjustment
TEMPERATURE ADJUSTING
SPINDLE
INDIRECT models
The indirect controls and back-up immersion heater
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are accessed by removing the Control Cover (see
Fig. 10, pages 19).
Unscrew the large screw on the cover using a flat
`
ended screwdriver.
Lift from the bottom of the cover at the point
`
indicated on Fig. 10 until cover comes away freely.
The back up immersion heater should be wired
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in accordance with the instructions given for
DIRECT models. The immersion heater cannot be
controlled by the boiler control or space heating
programmer, it must be connected with its own
dedicated electrical supply circuit.
The immersion heater and indirect thermal controls
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should be wired in accordance with Fig. 13.
The immersion heater and indirect controls MUST
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be earthed. The supply cable for the immersion
heater should be a minimum 1.5mm² 3 core HO5
Figure 13: Wiring schematic - INDIRECT models
Control Housing Details
Immersion connections
Indirect control wiring
1.5mm² 3 Core HO5 VV-F
sheathed cable
20
THERMAL CUT-OUT RESET BUTTON
1 2 3 L N
SPINDLE POSITIONS
ROTATE SPINDLE CLOCKWISE
FOR TEMPERATURE INCREASE
AND COUNTER CLOCKWISE
FOR TEMPERATURE DECREASE
VV-F sheathed cable and must be routed through
the right hand cable entry port provided, with the
outer sheath of the cable firmly secured using the
cable securing bar provided. The cable connecting
the indirect control to the heating system must
be an appropriate size for the maximum load of
the heating controls and should be routed in the
controls housing through the left hand cable entry
port and secured using the cable securing bar
provided.
The immersion heater
`
thermostats are factory set at 57
for details of how to adjust the temperature setting.
The immersion heater and indirect controls each
has its own individual thermostatic control. The
thermostats incorporate a thermal cut-out that will
switch off in the event of a thermostat failure. The
thermal cut-out reset button position is also shown
on Fig. 12.
Replace the Control Cover(s) before operating.
`
To do this tilt the cover and align the top two lugs
with the holes in the housing as indicated on Fig.
10. Hinge the cover downwards and firmly press
the cover until it "snaps" back into place. Secure
by tightening the screw on the cover using a flat
ended screwdriver. DO NOT OVER TIGHTEN.
Space and heating systems controls
The controls provided with the cylinder will ensure
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the safe operation of the unit within the central
heating system. Other controls will be necessary to
control the space heating requirements and times
that the system is required to function.
The cylinder is compatible with most heating
`
controls, examples of electrical circuits are shown
in Fig. 14 & 15, page 21. However, other systems
may be suitable, refer to the controls manufacturers
instructions, supplied with the controls selected, for
alternative system wiring schemes.
= MINIMUM TEMP
= MAXIMUM TEMP 70°C
= APPROX 57 °C
and boiler control
C. See Fig. 12
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