Safety Devices; Operational Checks - Hobart 6 GN1/1 Instalacion, Uso Y Mantenimiento

7.2.1 CHECKING THE PRIMARY AIR SUPPLY FOR THE
BOILER BURNERS (fig.8).
To adjust the primary air supply proceed as follows:
• Loosen the screw "A" and position the air shutter "B" at the
distance "H" respecting the following indications
L.P.G. G30/G31 H=mm
Natural gas G20 H=mm
• Replace, tighten and seal the screw "A"
7.3 CALIBRATING THE GAS PRESSURE SWITCH (fig.9)
A pressure switch is located in the gas line and can be accessed
by removing the left-hand side panel. This switch cuts off the gas
supply to the burners when the pressure level drops below
minimum. The calibration should be carried out during the
installation of the appliance. Position the indicator of the adjust-
ment pawl "R" to the value in the following table which corre-
sponds to the type of gas being used.
- Natural gas G20
- L.P.G. G30/G31
7.4 CALIBRATING THE CONVECTION BURNER GAS
VALVE
(Type "SIT" mod; 836 TANDEM) (fig.6)
The gas valve has to be calibrated and the setting depends on the
type of gas, the rating of the burner and the number of motor
revolutions.
The gas valve can be reached by removing the left-hand side
panel.
To calibrate the valve first switch the convection burner on and
then proceed as follows:
• Burners working at full power = 10,5 kW (1460 revs/min)
- Make sure the "E" button indicator light is off
- Remove the protective cap from the setting screw "T"
- When using NATURAL or LPG gas (nominal pressure to be
measured on the gas valve inlet "C", see data table) the pressure
regulator is disconnected by srewing carefully nut "B" troroughly.
• Burners working at reduced power equal to about 50% of the
nominal power (960 revs/min)
- Press the button "F" and then the button "E" on the control panel
and the yellow leds will light up.
- Turn the setting screw "A" (while keeping the nut "B" locked in
position using a 10 mm spanner) until the following pressure
levels are measured on the gas valve outlet "D" respectively:
Natural gas G20 7 mbar
L.P.G. G30/G31 10 mbar
Important: Once the calibration has been carried out reseal the
setting screw using a suitable product making sure that you don't
block the relief hole and then replace the cap "T"
Note: The steam generator gas valve is a "SIT" mod 830
TANDEM which is only used for controlling the nominal
power and does not therefore require setting.
These calibration procedures should only be carried out by
technically qualified personnel authorized by the manufacturer.
7.5 GAS DATA PLATE
After having changed the type of gas from that which was
installed by the manufacturer it is imperative that an adhesive
data plate indicating the new type of gas be applied to the
appliance in an easily visible spot.
8.

SAFETY DEVICES

The appliance is fitted with the following safety devices:
8.1 Ignition and flame control device which works together with
the gas supply safety valve. The lighting up of the red indicator
lights "RB" (for the steam generator) and "RC" (for the convection
generator) on the control panel (fig.3) indicates that the respec-
tive burners are blocked (the burner will be out). To reset the
device keep the respective button pressed down until the normal
operating conditions are returned, see paragraph 11 - Anomalies
and possible solutions-.
Attention: After long periods of inactivity the burner reset-
ting operations will have to be carried out several times to
bleed off the air from the gas line.
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32
10 mbar
15 mbar
8.2 The appliance is fitted with 3 fuses (fig.10), see the wiring
diagram located behind the control panel:
- F1(160 mAT, delayed action with an interruption power
level of 35A) protecting the ventilator fan.
- F2 (6.3A F, rapid action with an interruption power level of 35A)
protecting the auxiliary circuit and the electronic control.
- F3 (250 mAT, delayed action with an interruption power level
of 35A protecting the halogen lamp in the oven chamber.
To replace the fuses unscrew the locating cap and replace the
damaged component with one that has the same rating; this
value is indicated on the data plate located near the fuse.
8.3 Electronic water level control, monitoring the level of
water in the steam generator through the use of two probes:
- a work probe
- a safety probe which intervenes by cutting off the power supply
to the steam generator if the water level drops below the safety
level, this is indicated by the lighting up of the red indicator lamp
"Q" (fig.3) which will remain lit until the water reaches the safety
level. This indicator lamp remains permanently lit while the boiler
is heating up and flashes if the water level is insufficient.
8.4 The oven is fitted with a vapour damping system.
8.5 Oven door safe opening device.
The first forward movement of the handle will slightly open the
door allowing the steam to be released from the oven chamber
and the ventilator to stop.
8.6 Oven chamber safety thermostat "B1" (fig.10), with
manual resetting which intervenes by cutting of the power supply
to the convection heater whenever the temperature exceeds 340
°C. This safety device should be reset by a technically qualified
person after having eliminated the cause of the malfunction.
8.7 Steam generator safety thermostat "B2" (fig.10), with
manual resetting which intervenes by cutting of the power supply
to the steam generator
exceeds 140 °C (lack of water). This safety device should be
reset by a technically qualified person after having eliminated the
cause of the malfunction.
8.8 Ventilator fan with an incorporated overload protector
which cuts off the power to the motor whenever overheating is
detected protecting the appliance should the rotor be blocked.
This intervenes by blowing the fuse F1 (fig.10) which in turn
disables the appliance.
This safety device should be reset by a technically qualified
person after having eliminated the cause of the malfunction, and
then replacing the fuse F1 with one that has the same rating.
To replace the fuse, open the control panel, unscrew the fuse
holder, extract the fuse and replace it with one that has the same
rating as indicated on the data plate located near the fuse.
8.9 A pressure switch on the gas supply line leading to the air
blown burner cuts off the gas supply to the burners when the
pressure level drops below minimum, see paragraph 7.3.
The intervention of this pressure switch is characterised by the
extinction of the burners and the oven chamber light switching
off.
8.10 An automatically activated control circuit cooling sys-
tem cools down the electronic components.
9.

OPERATIONAL CHECKS

- Switch on the appliance following the user instructions;
- Check that the appliance gas piping is in good working order (no
leaks);
- Check the efficiency of the burnt gas exhaust system;
- Check the ignition and regularity of the flame by removing the
left-hand side panel and looking through the observation hole.
Note: The indicator lights "RB" and "RC" (fig.3) must remain off
(see point 8.1 Ignition and flame control device)
With the help of the instruction manual teach the user how to
operate the appliance and explain its functional characteristics.
Warning:
- While the machine is working the external surfaces be-
come hot.
- The outlets on the upper part of the appliance must not be
covered by objects.
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whenever the surface temperature