Swift Group Select 122 Owner's Handbook Manual page 93

T R UM A COMB IN ATI ON B OI LE R
Butterfly outlets
The majority of air ducting outlets on models
equipped with Truma Combi heating systems,
are of the butterfly type. These may be opened
or closed by moving the flap within the fitting,
to adjust the balance of the heating output
throughout the caravan. This can help offset
differences in blown air output, between
outlets close to the heating appliance, and
those greater distance away from the heating
appliance. This can also help adjust the
temperature of the bathroom, relative to the
temperature of the main living area and/or
bedroom.
When these butterflies are closed in
conjunction with a high heating system
output, and therefore a high fan speed, a
slight whistling sound can occur. In this case,
opening the outlet slightly will reduce or
remove the noise.
Closing too many outlets when the heating
system is producing a high output, can
cause the appliance to reach high operating
temperatures. This does not in general terms
effect the appliance, but can cause the
appliance to automatically shut down. This
can cause an interruption of the heating of
the motorhome, however heating will resume
when the appliance temperatures have
reduced to a lower level.
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The output of the appliance, and therefore the
output of the blown air outlets, will generally be
higher when using Gas or Duel Fuel operation.
Electric only operation of the heating is rated
at up to 1.8kW , whereas Gas (or Dual Fuel)
operation is rated up to 4kW (3.8kW) or 6kW
(5.8kW), depending which model or Combi is
fitted.
The blown air fittings can also be rotated to
adjust the direction of air leaving the outlet,
as shown in the photo.