Convotherm OEB Series Service Handbook page 90

Service Handbook OEB/OES/OGB/OGS
Instructions – Removing and assembling the unit parts / components:
The following unit parts / components can and should be removed and descaled.
Proceed step-by-step as described in the previous instructions „Descaling the unit parts /
components".
1. Injection pipe for direct injection

The injection pipe is fastened with a nut SW10 on the backside of the suction
panel. Loosen the nut and remove the injection pipe

After descaling, assemble the injection pipe with the nut SW10 onto the backside
of the suction panel again.
2. Injection nozzle for direct injection

The injection nozzle (SW 14) is fastened into the unit ceiling with a union nut.
Using a wrench, unscrew the nozzle SW14.

After chemically descaling, rescrew the nozzle with the union nut on again.
3. Water inlet for direct injection

Unscrew the injection nozzle (SW 14).
Loosen the union nut SW 19 with a wrench  the water inlet pipe can then be

pulled into the electric connection area.

Loosen hose connection on water inlet and remove pipe from hose.

After chemically descaling, assemble the water inlet with the union nut and the
nozzle again in the reverse process.
4. t-piece for manometer and pressure switch in the water inlet for direct injection

Unscrew manometer and pressure switch from the t-piece

Loosen hose connection above and below the t-piece and remove t-piece

After chemically descaling, using a needle, make sure that the t-piece has a clear
passage.

Assemble the parts in the reverse procedure
5. Demoisturizing tub

Remove cover of the demoisturizing tub

Unscrew nozzle, descale and ensure it has a clear passage.

Rescrew nozzle on and place cover on the demoisturizing tub.
6. Water level probe

Remove water level probe
Attention:

Chemically descale only the probe, do not mechanically clean the surfaces
because the water level probe is galvanized and this coating will be scratched

Remove seal, clean and check

Assemble water level probe with cleaned /new seal and electrically connect
7. Preheating probe B4

Unscrew probe, chemically descale and assemble again.
Notice:
For heavy scale build up and a water hardness > 18°dH (problem water), we recommend
the following:

Check the water tightness of the steam generator pump and the water level probe
during descaling in the unit

Recommend to your customers a partial decalization system (hydrogen ionic
exchanger i.e. from the company Brita).
Cross reference:

Service Handbook 4.3.2 "Half-automatic Oven cleaning"

Service Handbook 4.3.3 "Automatic cleaning system CONVOClean system (Option)"

Installation Handbook Chapter 4.1 "Water inlet"
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