EN1R
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9099 2004R8
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NE
4
Line voltage
Limit control
Transformer
Thermostat
follow them. If these instructions are not provided then
use the procedure outlined below.
CAUTION
24 Vac
Valve operator
Fig. 3. Wiring 24 V, 50 Hz
OPERATION
The operation of the pilot safety system is accomplished by
manipulation of a knob, provided with programming symbols
that indicate lighting and shutt off.
Lighting
• Depress knob and hold it down.
• Ignite pilot burner.
• Hold knob down for 20 seconds, after pilot burner has
been lit.
• Release knob.
• Wait at least three minutes before a second attempt to light
the pilot burner is made, when pilot flame has not been
established.
Shut off
In order to interrupt all gas flow through the gas control, knob
must be turned clockwise to its stop.
After release the knob will automatically rotate to its ready
position.
IMPORTANT
A safety latching device prevents the knob from
being fully depressed until the thermocouple has
cooled down sufficiently to de
-
energize the power
unit, after which the knob will be effective again.
When the knob is depressed during latch position,
pilot gas will flow to pilot burner. However, when
knob is released, pilot gas extinguishes and main
gas supply is not affected.
Wait one minute after shut off before starting lighting
procedure.
ADJUSTMENTS AND CHECKOUT
WARNING
Adjustments must be made by qualified persons only.
If the appliance manufacturer supplies checkout and/
or service and maintenance instructions carefully
To ensure a safe closing of the valve, it is essential
that voltage over the terminals of electric on/off servo
operator is reduced to 0 Volt.
Pressure tap
The gas control is provided with a pressure tap of 9 mm outer
diameter at inlet and outlet side.
When checking the pressure undo the screw a half turn and
slip tube over nipple.
Ensure that screw is retightened after making test.
Pilot flame adjustment (see fig. 1.)
The gas control is packed for shipment with pilot flow at
maximum. Refer to the pilot burner manufacturer’s
instructions for recommended size of pilot flame.
If adjustment is required turn pilot flow adjustment screw
clockwise to decrease or counter clockwise to increase pilot
flame.
Outlet pressure adjustment (see fig. 1.)
• Energize electric on/off servo operator in order to have gas
input to burner.
• Check input to the appliance using a clocking gas meter or
alternatively a pressure gauge connected to the outlet
pressure tap.
• Open cap to expose throttle adjustment screw.
• Turn the flow adjustment screw with a screw driver
either
way
until the burner pressure required is recorded on the
pressure gauge.
• Close cap.
Check of slow opening (softlite)
The softlite pressure is factory set.
Check burner performance at this pressure observing burner
ignition and flame characteristics.
Burner should ignite promptly and without flash back to orifice
and all ports should remain lit.
Cycle burner several times (wait 10 seconds between cycles
to allow servo system to resume slow open action).
Repeat check of slow opening after allowing the appliance to
cool down.
Checkout
Set appliance in operation after any adjustment and observe
several complete cycles to ensure that all burner components
function correctly.
Maintenance and service
Under normal circumstances no maintenance or service is
required.
Screws on the valve that have been sealed must never be
removed.
Resideo Pittway Sàrl
Z.A. La Pièce 4
1180 Rolle
Switzerland
TR
TH
