Heatline SARGON 18S, Installation, Servicing And User Instructions Manual

Page: 10 / 54

3.1 The Sargon 18S / 24S / 30S are fan fl ued, wall-mounted system boilers that supplies
heating and possibly domestic hot water via a storage cylinder. Being room sealed the boiler
may be installed in any room without the need for purpose made ventilation. However, if the
boiler is installed in a compartment it is recommended that the compartment is ventilated for
cooling purposes. A functional diagram of the boiler’s principal components is given in
fi gure 1.
3.2 An electronic control unit, consisting of a PCB and separate ignition module provides direct
burner ignition and fl ame supervision along with continuous modulation of the burner’s gas supply.
3.3 An interface unit, which includes boiler adjustment potentiometers
and fault display provides easy adjustment and fault diagnosis.
3.4 Heat transfer of heat to the boiler’s primary hydraulic circuit is obtained via a primary,
gas to water heat exchanger within a hermetically sealed combustion chamber. A 24
volt, modulated speed fan blows the gas/air mixture into the combustion chamber
and expels the products of combustion to outside air via an associated
fl ue system.
3.5 An integral pump located in the boilers main hydraulic circuit circulates water
through the primary heat exchanger to the central heating circuit. In the event of
reduced or interrupted water circulation in the central heating circuit, an automatic
system by-pass should be
fi tted as far away from the boiler as possible. Note: It is
no longer permissible to utilise a non-thermostatic controlled radiator as a by-pass.
3.6 Room temperature can be controlled by the use of an external room thermostat
and thermostatic radiator valves. Note connection of the room thermostat is
dependant on the operating voltage of the thermostat. See section 9.4 & 9.5 for details.
3.7 The boiler incorporates an integrated clock, which allows the setting of central heating
periods (See the User Instructions, Boiler Controls for details) and the boiler’s control panel
incorporates an LCD display, which indicates the state of operation and fault defect codes.
4.1 Using the operating switch the boiler can be set to operate central heating.
4.2 DOMESTIC HEATING MODE:
When the Control is set to “ON” and a heating demand is requested, (power is on, the
timer and thermostat are calling for heat) the boiler will
fi re automatically. The integral
pump is then energised and hot water from the boilers primary circuit is circulated
around the central heating systems pipe-work and radiators. When the demand for
central heating is no longer present, either the thermostat reaches temperature or the
time clock reaches the end of its set period, the burner will shut down and the boiler will
revert to stand-by, waiting to respond to the next heating demand. The pump will continue
to operate for a short period of time to dissipate any excess heat from within the boiler’s
heat-exchanger.
3.Boiler Characteristics
6
4. Operation