Scc - Manual Humidity Calibration - Rational SelfCookingCenter SCC Training Manual

SCC - Manual humidity calibration

Pre condition before Self test and Calibration
Manual calibration shall be done after:
Changing fan motor or fan wheel, P1, b4, Air baffle, later installation of Ultravent or as the lower
unit of a COmbi Duo.
Note: DO NOT run a self test as during self test the steam generator volume will be
measured newly and this might be full of scale.
- temperature of cooking cabinet sensor B1, control sensor B2 and humidity sensor B4 is below
40°C (104°F)
- closed GN container in front of fan wheel inside cabinet
- door contact closed and left side panel closed
Component test
Test of:
Drain valve M7, Solenoid Y1, SC Pump M4, level electrode S2, CDS Sensor, Solenoid Care Y4, Solenoid Mois-
tening Y3
P1, Motor, Heating etc are tested during the following humidity calibration steps
Humidity calibration
Step Function
0 ready fo calibration
10 checking calibration
conditions
20 Measuring Offset P1 with
fan motor not turning
100 - pressure measurement
131 cold
200 steam heating up to
boiling point without fan
motor
202 steam heating with fan
motor
210 - pressure measurement
241 steam
300 heating of cabinet to
193°C (380°F)
followed by 60 sec. to
170°C (338°F) steady
condition
301 - pressure measurement
332 combination
999 calibration successful
Switch off and open cabinet door!
Caution: Steam
The following self test or calibration errors have occurred:
10 unit too warm, cool down
20 Power supply 12V dc to P1 is missing
100 Motor mechanically blocked or defective, change motor
200 Unit not heating (energy optimising active), unit set to 1/2 energy or drain open.
Note gas units: After self test a flue gas analysis must be done.
possible calibra- reason for error - remedy
tion error mes-
sage
Any indicated error relates to the corresponding
calibration step.
10
e.g. error 10 will be indicated, when the condition for
calibrations is not given.
20
Reason: B1, B2 or B4 is above 40°C (104°F)
100
e.g. error 100 will be indicated if motor or fan wheel
is blocked,
200
2 steps for each speed and direction, e.g.
100, 210, 301: running fan motor at constant speed
„1"
101, 211, 302: store P1 value at this given speed
e.g. error 200 is indicated, when
box will not reach the necessary 80°C (175°F) to
determine the boiling point in the allocated time.
Reason: e.g. high negative pressure by exhaust hood
above the unit is permanently cooling the control
sensor via the venting pipe; install p-trap (syphon) at
drain connection.
These errors are indicated during the respective
calibration step is running.
After solving the problem the Self test must be
started again.
- 73 -
B2 in the control
V08 en, SCC