Operating Instructions DFO/DFI Series Mechanical Convection Ovens/Incubator
21
4.2 Regular check of the RCD
Regular check of the RCD is required for safe operation. Intervals of one month for normal use, or the
first time powering up after repairing or standstill for long period, are recommended for regular
check of the functionality. Check the RCD as follows:
1)
Engage
to its on position as for normal use;
2)
Press
, and if functional, the RCD will be disengaged with a click; If the RCD is not
disengaged during the test, do not attempt to operate the oven any longer but call for a service;
3)
Press
before attempting to engage the RCD to its on position again (Fig 1
⑥
).
4.3 Regular check of the STB
Regular check of the STB is required for safe operation. Intervals of six months for normal use, or the
first time powering up after repairing or standstill for long period, are recommended for regular
check of the functionality. Check the STB as follows:
1)
Set the temptature of oven at the highest temperature, start up oven with full power heating to
150
℃
;
2)
Use a thin and long tool to insert the testing access for STB to cut-off the fan. Note:keep inserting
and make sure the fan stop work while testing .The circulation is at the fault and the temperature of
bottom plenum heater nearby is high.caution
：
risk of overheating!
3)
The STB will be triggered in about 200~300s, if functional, with
Stb
displayed and beeping and
LED alarm by the controller; If the STB is not triggered in 360s, take off the testing tool
immediately, switch off the controller and call for a service;
4)
Take off the testing tool after inspection, and wait until the temperature within the bottom plenum
goes down. Use a tip tool (Fig 1
⑤
) to reset the STB as shown in the picture and reboot the
controller.
The first time powering up after repairing or standstill for long period, or at
designated intervals under normal use, check the functionality of the following parts
or components:
Breaking capability of the residual current circuit breaker (RCD) at one month
intervals!
Cutout capability of the over temperature protection device (STB) at six months
intervals!
Inspection for independence over temperature protection device (STB) may result in
hazard of over temperature! The inspection must be operated by trained eligible
engineer, take care of the risk of over temperature for all the inspection. Ror
incubator Oven ,the highest temperature is 200
°
C,the heater may work without full
power while inspection because of constant temperature control resulting in
temprarure increasing slowly so that over temperature protection device (STB) can
’
t
reach the trigger temperature.
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