page 10
Fig. 3
1.11 EXPLODED VIEW - WR version for ceiling installation
page 27
decrease the pressure and clockwise to increase
the pressure (this operation can be carried out
only when using methane gas G20).
Turn the room thermostat dial to the minimum
value and check that the burner shuts off.
Remove the pressure gauge tube and tighten
the pressure regulator screw, carefully checking
the seal. Replace the regulator protection plug.
WARNING! When the burner turns off, the fan
will continue to operate for a few minutes, to
properly cool the exchanger. Therefore, it is
important not to turn off the air heater using
the mains switch, that also cuts off the power
supply to the fan, since this might lead to
overheating.
Then repeat the start-up operation to observe
and check that the burner has ignited correctly
and that the flame is stable.
For installation with ducts (WD). While the
burner is functioning, use the switch (F) to select
the minimum fan speed, and run the unit for
approximately 20 minutes. During this period
verify that the heated air freely and properly exits
the duct’s grilles or outlets. If there are any
obstacles or incorrect adjustments to the outlets,
or if the size of the ducts is incorrect, the safety
system could be activated. If this occurs, try to
locate and eliminate the possible causes of the
overheating.
Once the checks have been completed, put the
casing’s panels back in place and make sure
that they are correctly attached. Place the plastic
finishing caps in any fastening holes that have
remained open.
5.3 USER INFORMATION
It is recommended that the user be informed
about all the procedures necessary to use
the air heater correctly, with particular
reference to the ignition and shutdown
phases and about the importance of periodic
tests, which must be performed at least once
every year by skilled personnel.
6. GAS TYPE CHANGE
6.1 SWITCHING FROM GAS IN THE SECOND
GROUP (NATURAL GAS) TO GAS IN THE
THIRD GROUP (LPG)
a) Check that the envelope supplied with the air
heater contains the replacement injector, the
screw block with pin and the adhesive label,
on which to indicate the new type of gas being
used, to replace the original one
b) check that the diameter of the injector
indicated for the type of gas to be used (see
technical data table on page 7) corresponds
to what is stamped on the injector.
c) Close the gas on-off valve and disconnect the
electric power supply. Remove the air heater
casing’s right angular panel by first removing
the two screws located on the front (protected
by plastic caps) and then using the point of a
screwdriver as a lever to release the fastening
springs in the rear.
d) Remove the 2 screws which attach the gas
supply pipe connector to the combustion
chamber (fig. 24). Gently remove the
connector until the injector is free and unscrew
it using a 10-mm hex wrench. Insert a new
injector and retighten it to ensure a proper
seal. Put the connector back in place and
attach it to the combustion chamber with the
two screws.
e) Unscrew the pressure regulator protection
plug located on the gas unit. Insert the screw
block with pin in the place of the protection
plug and tighten it so as to put the regulator
out of service (fig. 24). Keep the pressure
regulator protection plug for future use.
f) insert the water column pressure gauge tube
into the upstream pressure inlet on the burner
(fig. 23) after having backed off the closing
screw a few turns
g) start the air heater according to what is
indicated in point 5.2. Check that the supply
pressure corresponds to what is indicated in
Fig. 23
GAS UNIT
Electrical
connection
Pressure
regulator screw
Gas
Pressure test-point
Pressure inlet
Summary of Contents for W
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