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Heller Oven

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#76977

Heller Oven | 31 January, 2017

My oven is a Heller 1809 EXL. Some zones are overheating, reaching more than double of specified (SP). What can be the cause of this?

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#76980

Heller Oven | 31 January, 2017

Most probably some of your convection blowers don't work.

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#76982

Heller Oven | 31 January, 2017

You can contact Heller service by email serviceNJ@hellerindustries.com to get help with any issue. High Deviation or high process alarm could be due to one of the below reason. A. Blower motor in subject zone is not running – check for air flow B. Heater element– This requires measuring resistance of the heater element and make sure it should not open or short to the ground. C. SSR (KS1) for delivering voltage to subject zone is defective – this requires measuring different voltage drops across the SSR in order to determine if it is functioning correctly. D. Thermocouple wire in subject zone- it should not be shorted to ground or open. Also make sure it should not be loose at terminal block. E. Or you could have a combination of any of the above.

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Rob

#76991

Heller Oven | 1 February, 2017

Usually it's the motor start caps blowing on the motors - take one off a failed motor and check the type strapped to the side - our older ones use these:

http://hk.element14.com/genteq/27l571/capacitor-polypropylene-pp-film/dp/1735893?ost=27L571&selectedCategoryId=&categoryNameResp=All%2BCategories&searchView=table&iscrfnonsku=false

They are under $10 USD each

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#77063

Heller Oven | 7 February, 2017

On a our electricity ovens the most common problem with overheating zones is usually the solid state relays.Not sure if this would relate to the Heller ovens.

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dwl

#77067

Heller Oven | 8 February, 2017

Ry-n,

Yes, this applies to Heller ovens. I had the exact same problem. The SSR failed and current continues to flow through the heating coils until it triggers an emergency shut down.

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#77157

Heller Oven | 1 March, 2017

Thank you guys for the answers. I have solved a part of the problem. I replaced the caps that Rob mentioned and some blowers start working. I still have problems with 2 heats. One of them the blower is not working even changing the cap. The other one the blower is working but the zone is overheating.

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Rob

#77165

Heller Oven | 2 March, 2017

Hi Ivam,

1) for the not working motor, can you swap it with another from the cooling zone to see if it is the motor or motor control?

2)You are not getting bleed through from one zone to another are you? Can you list by zone what exact SP you have set?

Example: 120 180 220 240 270 180

Rob.

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#77166

Heller Oven | 2 March, 2017

Definitely SSR's

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