Heatrae Sadia Megaflo Eco 125DD, Manual

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Space and heating systems controls
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The controls provided with the cylinder will ensure
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.
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The immersion heater and indirect thermal controls
should be wired in accordance with Fig 15
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The immersion heater and indirect controls MUST
be earthed. The supply cable for the immersion
heater should be a minimum 1.5mm² 3 core
HO5 VV-F sheathed cable and must be routed
through the cable entry ports 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 other cable entry port
and secured using the cable securing bar provided.
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The immersion heater and indirect control
thermostats are factory set at 60
o
C. Should this
require adjustment see Fig 14 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 14.
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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
12. 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
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The cylinder is compatible with most heating
controls, examples of electrical circuits are shown
in Figures. 16 & 17. However, other systems may
be suitable, refer to the controls manufacturers
instructions, supplied with the controls selected, for
alternative system wiring schemes.
INDIRECT models
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The indirect controls and back-up immersion heater
are accessed by removing the Control Cover (see
Fig 12).
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Unscrew the large screw on the cover using a flat
ended screwdriver.
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Lift from the bottom of the cover at the point
indicated on Fig 12 until cover comes away freely.
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The back up immersion heater should be wired
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.
Figure 15: Wiring schematic - INDIRECT models
Figure 14: Thermostat adjustment
SPINDLE POSITIONS
= MINIMUM TEMP
= MAXIMUM TEMP
= APPROX 60 °C
ROTATE SPINDLE CLOCKWISE
FOR TEMPERATURE INCREASE
AND COUNTER CLOCKWISE
FOR TEMPERATURE DECREASE
TEMPERATURE ADJUSTING
SPINDLE
THERMAL CUT-OUT RESET BUTTON
L
N 1 2 3
Control Housing Details
Immersion connections
1.5mm² 3 Core HO5 VV-F
sheathed cable
Indirect control wiring