Zanussi ZCG 640 - Manual (Page 18)

18
Conversion from Natural to LPG Gas
IMPORTANT
The replacement/conversion of the appliance
should only be undertaken by a registered engineer
or competent person.
It is important to note that this model is designed for
use with natural gas but can be converted for use with
butane or propane gas providing the correct injectors
are fitted. The gas rate is adjusted to suit.
The oven burner and the hob burners do not
need any primary air regulation.
Replacement of gas hob
burner nozzles
• Ensure that the gas taps are in the 'OFF' position
• Isolate the appliance from the electricity supply
• Remove all pan supports, burner caps, rings, crowns
and control knobs.
• With the aid of a 7mm box spanner, the burner
injectors can then be unscrewed and replaced by
the appropriate LPG injectors (see Technical Data).
Commissioning
When the hob has been fully installed it will be
necessary to check the minimum flame setting. To do
this, follow the procedure below.
- Turn the gas tap to the MAX position and ignite.
- Set the gas tap to the MIN flame position then turn
the control knob from MIN to MAX several times. If
the flame is unstable or is extinguished follow the
procedure below.
Procedure:
- Re-ignite the burner and set to MIN.
- Remove the control knob. According to the different
gas tap versions, the adjustment screw can be
located down the centre of the gas tap control shaft
or on the gas tap body itself (see diagram).
- To adjust, use a thin bladed screwdriver and turn
the adjustment screw until the flame is steady and
does not extinguish, when the knob is turned from
MIN to MAX. Repeat this procedure for all burners.
Pressure Testing
- Remove left hand pan support and front left burner
cap and crown.
- Fit manometer tube over the injector.
- Turn on the burner gas supply and ignite another
burner supply.
- The pressure reading should be nominally 20mbar
and must be between 17 mbar and 25mbar.
- Turn off the burner supplies.
Position of by-pass screw
(according to different gas
tap versions)
Minimum level adjustment
of gas hob burners
With the aid of a thin bladed screwdriver completely
tighten down the by pass adjustment screw. Upon
completion, stick the replacement gas type label on
the back plate of the appliance.