Important Information - Swift Motorhome Owners Service Manual

Boiler design
The boiler consists of three eccentrically- fitted
cylinders (heat exchanger, water jacket for the
heating system and, outermost, water jacket
for hot water). The two outer pipes, and their
ends and connections, are made of stainless
steel, while the heat exchanger is made of
aluminium.
The heat exchanger is divided into two semi-
circles. The burner is located in the upper
half, being the combustion chamber, and
the combustion gases are expelled through
the lower half. The burner unit is fitted on the
end of the heat exchanger. It consists of a
combustion fan, burner, solenoid valve and
intake/exhaust connections. Two heating
cartridges are fitted to the water jacket of the
heating system. Maximum output is 2 or 3 kW,
depending on model.
Description of functions
Using LPG
When LPG operation is selected on the control
panel, the combustion fan starts. When the
fan speed is correct, it signals the circuit
board that the boiler can be lit. The circuit
board sends ignition sparks to the spark plug
at the same time as it sends electricity to the
solenoid valve, which opens to allow gas in.
The burner ignites, and a sensor transmits a
signal back to the circuit board that the boiler
is lit, and the ignition spark stops. The burner
keeps burning until the boiler thermostat or the
room thermostat reaches the set temperature
reading.
Should the boiler go out for any reason, the
sensor is activated and a new attempt is made
to start the boiler (in about 10 seconds).
Using the heating cartridge
Electrical operation is selected on the control
panel, the 12-volt relays on the circuit board
trip, allowing the 230 volt supply to reach the
electrical elements.
The heating cartridge is controlled in the same
way as the gas boiler.
Warm water
When only warm water is required, for example
during the summer, no settings need to be
made, the boiler will look after this function
automatically.
The pump will only start when the temperature
in the vehicle is lower than the set temperature.
If the vehicle temperature is higher, the pump
will not start.

Important information

• The boiler must not be started if there is no
glycol in the system.
• The LPG boiler and heating cartridge may be
operated in parallel.
• The heating system may be heated up
without the warm water heater being filled
with fresh water.
• Always switch off the main isolator for the
boiler when the vehicle is not being used.
• Always drain the warm water heater of fresh
water if there is a risk of frost.
• The LPG boiler must not be operated when
refuelling the vehicle.
• When washing the vehicle, take care not to
get water in the venting.
The domestic hot water heater
The boiler is fitted with a built-in warm water
heater with a volume of approx. 8.5-litres fresh
water. The warm water heater can produce
around 12 litres of 40°C water per half-hour
(at a cold water temperature of 10°C). If the
heating cartridges are used instead of gas
for heating the boiler, the capacity is slightly
reduced.
Always rinse out the heater before it is used,
particularly if it has not been in operation for
some time.
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