Flue Gas Exhaust; Burner Connection; Electrical Connection; Commissioning - State Water Heaters SOF 85 220 G Installation Instructions And User Manual

2.1.3 Flue gas exhaust

For the SOF 85 220 and 70 700 the adapter ring supplied
must be fitted prior to connecting the flue gas exhaust.
For the other models (SOF 85 260, 85 300, 75 390 and
75 470) the flue gas exhaust can be connected direct to
the water heater. The flue pipe, which is protected
against corrosion, must at least have the same diameter
as the mounting flange on the water heater. For units with
an oil-fired burner, a stainless steel flue pipe must be
installed.
For all water heaters the length of the flue system must
not exceed 9 metres.
A 45° bend corresponds to 0.5 metre of exhaust pipe, a
90° bend corresponds to 1 metre of exhaust pipe.
The following diameters of flue gas exhaust pipes apply:
UNIT
SOF 85 220
SOF 85 260
SOF 85 300
SOF 75 390
SOF 75 470
SOF 70 700

2.1.4 Burner connection

For connecting the ventilator burner, please refer to the
instructions supplied with the burner.
Read these instructions carefully before attempting to
install and connect the burner.

2.1.5 Electrical connection

All electrical connections must be carried out in
accordance with IEE regulations by an accredited
electrical installation company.
The control box must be connected to the mains by
means of a permanent electrical connection. A bipolar
main switch with a contact opening of at least 3 mm must
be fitted between this permanent connection and the
heater.
The supply cable must have cores of at least 3 x 1.0
2
mm . The connecting clamps for the supply voltage are
located on the connector strip in the control box. Always
check with a voltage tester if the live and the neutral have
indeed been connected correctly in the control box. This
is essential for the functioning of the ventilator burner's
flame detection.
The electricity supply must comply with the requirements
below:
Supply voltage Frequency
230 V AC
(-15% / +10%) (+/- 2%)
Diameter flue gas
exhaust pipe [mm]
150
200
200
200
200
250
Fuse
50 Hz 6 A
The electrical diagrams of all connections in the control
box are shown in the appendix, (see figure 9: Electrical
diagram).
2.2

Commissioning

2.2.1 Filling the heater

1. Fit drain valve and check that it is closed;
2. Open the cold-water tap to the heater and all
hot-water outlets in order to remove all air from the
system. The heater has been filled when cold water
runs out at all outlets;
3. Close all taps at the hot water draining points. The
heater is now under water mains pressure. At this
pressure, which can be read on a manometer, the
relief valve must not release any water.

2.2.2 Turning on the burner

The burner must be turned on in accordance with the
installation manual supplied with the front-mounted
burner.
2.3

Shutting down

For brief periods:
1. Turn the temperature control knob fully clockwise
(up to 40°C) and set the 'I/0' switch to '0'.
For longer periods:
1. Switch off the supply voltage by operating the
bipolar main switch;
2. Close the inlet oil valve;
3. Close the water inlet tap;
4. Empty the heater to prevent frost damage.
2.4 Usage / temperature control
The water temperature is controlled by the control box on
the heater. If the temperature in the water heater drops
below the set value, the control box will send a voltage
signal to the ventilator burner. The burner automation of
the ventilator burner will then ignite the burner and keep it
burning until the control box ceases to supply voltage
signals.
The desired water temperature can be set between 40°C
and 80°C. High water temperatures cause more calcium
precipitation in the water heater. Moreover, the stand-by
losses of the water heater are greater with higher
temperatures. Therefore, it is recommended to set the
control thermostat to approx. 60°C.
For reasons of safety, the water heater is equipped with a
high-limit thermostat and an overheating cut-out. If the
high-limit thermostat is activated, the heater is not locked
and the control thermostat will take over the temperature
control again as soon as the high-limit thermostat is
deactivated.
If the overheating cut-out is activated, it must be reset
manually after the water has cooled down. Upon
resetting, the water heater will resume its operation in the
usual way.
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