Zanussi ZCM 640 ZCM 641 - Manual (Page 19)

19
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 istself (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.
Conversion from Natural Gas to LPG
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 and the gas rate is adjusted to suit.
Method
• 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).
To adjust the gas rate
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.
IMPORTANT
The replacement/conversion of the appliance should
only be undertaken by a competent person
Position of by-pass screw
(according to different gas
tap versions)