Convotherm OEB Series Service Handbook page 35

Service Handbook OEB/OES/OGB/OGS
2.5.1b Steaming at 100°C in units with direct injection (OES/OGS)
active in this cooking programme
=
not active in this programme
=
can be active
=
i
Information:
In Steaming, the oven 3 is heated via the convection heating 11 / the convection
heat exchanger 6. To generate steam, water is sprayed into the fan wheel 2 via the
injection nozzle 18 and the water injection distributor 17, through the centrifugel
force it is flung outwards and evaporates on the hot surface.
The switching on and off of the convection heating 11 / convection burner 6 is
controlled by the oven temperature probe B6, which switches the heating / burner
on when the temperature falls below the nominal temperature.
The generating of steam is controlled by the bypass temperature probe B5. The
injection of water into the fan wheel 2 remains switched on via the solenoid valve
Y4 until the bypass temperature probe B5 has reached its nominal temperature
(Steam saturation). After further operation, the injection (solenoid valve Y4)
switches on when the temperature on the end of the bypass pipe 5 falls below the
nominal temperature (steam requirement via the bypass temperature probe B5).
The motor 12 runs continuously in reverse operation in Steaming via the contactors
K5 and K50.
The programme is stopped automatically when the time or the pre-set CTC (Core
temperature probe B10 ) temperature is reached.
AS/11-2011
1 = Pressure compensation valve
2 = Fan wheel
3 = Oven chamber
4 = Steam and air circulation
5 = Bypass pipe
6 = Convection heat exchanger
7 = Demoisturizing tub
8 = Hydraulic seal in condenser
9 = Demoisturizing nozzle
10 = Condenser cooling
11 = Convection heating
12 = Fan motor
13 = Pressure regulator
14 = Manometer
15 = Pressure switch (water)
16 = Reducer nozzle
17 = Water injection distributor
18 = Injection nozzle
B3 = Condenser temperature probe
B5 = Bypass temperature probe
B6 = Oven temperature probe
B10 = Core temperature probe
Y1 = Solenoid valve "condenser cooling "
Y2 = Solenoid valve " demoisturizing "
Y4 = Solenoid valve direct injection
2_05_01e_Steaming at 100°C_b
Page 2 / 2