Convotherm OEB Series Service Handbook page 89

Service Handbook OEB/OES/OGB/OGS
4.4.3 Descaling unit parts
Check:
When the oven in units with direct injection and units with steam generator are descaled,
the descaling of various unit parts / components is at least at this time necessary. If
malfunctions exist that are caused by water conducting unit parts that are blocked or
scaled then it is also necessary to descale.
i
Information:

When repeated problems exist with scaling / blocked unit parts, the water quality of
the water being used is not suitable or is not in accordance with that which is
recommended in the Installation Handbook: Possible causes:

No water treatment available: Recommend to your customers a partial decalization
system (hydrogen ionic exchanger i.e. from the company Brita).

The partial decalization is not correctly adjusted. Check the system and the water
quality (see below for instructions).

Check whether in the water connection and in the solenoid valves, drain filters are
in place. Use a sediment filter 0,08 mm for heavier water impurities.
Safety:

Attention: : After water softening, the treated water must have the following
qualities:
Notice: Descaling solution

Vinegar or citrus acid is biodegradable.

Otherwise use only the Convotherm descaling solutions
CONVOCal for normal descaling  can be used by the customer.

CONVOCal forte for heavy descaling  can only be used by trained technicians.


For descaling the unit parts, mix the descaler 1:3 with water (1 part descaler + 3
parts water).
Attention:

Descaler can never be heated

Remove thoroughly all over flow descaler with a lot of water.

Vapors can cause irritation! Ensure adequate airing!!

Do not inhale spray mist or vapors!

Do not mechanically scratch unit parts.
Instructions – Descaling the unit parts/ components:
To descale the various unit parts, proceed step-by-step as follows:
1. Remove parts.
2. Chemically descale parts, i.e. immerse in descaler (working time depends on
heaviness of build up 30 – 60 Min.).
3. Thoroughly flush parts with water
4. Neutralize parts, i.e. immerse in CONVOClean (forte/new) and afterwards flush
again thoroughly with water.
5. Check that parts are free of scaling (clear passage) and assemble again.
AS/11-2011
 Drinking water quality
 Residue hardness:
– min. 5°dH - max. 7° dH
– min. 9° fH – max. 13° fH
– min. 6,3° eH - max. 8,8° eH
– min.90 - max.125 ppm (USA
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