Service manual

S 301.01-00 15
95.11
Fig. 12
A - Water filter
B - Pressure regulator
C - Pressure gauge
D - Solenoid valve
THE HOUR COUNTER PARAMETER
The following parameters with the default value “0” function
as hour counters:
P25 - hCNV
P26 - hVAP
P27 - hMIX
These represent respectively the number of operational
hours for the oven in the convection cycle (hCNV), steam
and thermostatically controlled steam (hVAP), combined
and regeneration (hMIX). The combined total of these
(¿ 0,65)
D
B
C
A
H O addolcita
2
Softened H
2
O
parameters equals the total operational hours of the
appliance.
They will show zero if the oven is new or the preset
parameters have been reloaded. These parameters are
read only, if you attempt to modify them they will be zeroed.
Important: In order to create a statistics data base regarding
the reliability of the appliances and their internal compo-
nents it is important that these parameters
(hCNV+hVAP+hMIX) be noted on the after sales service
reports.
STEAM/CONVECTION SECTION
INSTANT STEAM GENERATION CIRCUIT (ISG)
The instant steam generation circuit consists of (fig. 12)
- a gas or electric heating unit
- a water pressure regulator
- a water pressure gauge
- one solenoid valve assembly with one inlet and two
outlets; The solenoid valve with the greatest capacity is
used in the steam cycle and the other valve, with an inferior
capacity, is used in the mixed cycle.
To gain access to the steam circuit components remove
the left-hand side panel from the appliance.
Regulating and testing the steam cycle
For the appliance to function correctly during the steam
cycle the water supply pressure (1,2 bar) must be adjusted
during the installation.
To regulate the pressure carry out the following actions in
sequence and with the door closed:
• switch on the power at the mains;
• open the gas and water cut off cocks;
• close the oven chamber steam relief valve;
• turn the cycle selector to the 100°C steam position;
• ignite the pilot burner (only for models with manual
ignition);
• set a cooking cycle time of at least 10 minutes
• At this point check the following:
- that the oven chamber ventilator fan works;
- that the heating elements function correctly;
- that water is being let into the oven chamber and that only
the solenoid with the greatest capacity is functioning;
- that the pressure gauge indicates a water pressure of 1,2
bar; if this is not the case use the setting screw on the
pressure regulator to adjust the pressure;
- that even when the burner is off water is still being let into
the oven chamber.
• Also check the following:
- that when steam is being produced the solenoid valve
controlling the vapour damping system is functioning;
- that when temperature in the oven chamber has stabi-
lised the value on the display is between 98° and 101°C.
• Finally pass over to the “mixed cycle” (by setting a
temperature of 150°C in the oven chamber) and check that
water is being let into the oven chamber via the solenoid
valve with the least capacity.