
Operating and installation instructions │Pro Thermetic │Tilting boiling pan PBOT-G
EN │01-2020 87.8021.01 8
The safety valve represents the final safety mechanism for the boiling pan. It must be able to prevent an
impermissible excess pressure in the boiling pan’s dual casing even when all other upstream regulating
devices, control devices and monitoring devices fail.
Important: Performing repairs on safety valves is not permitted. If it is faulty or leaks the whole safety
valve must be replaced by an authorised specialist.
If the temperature control is not working properly switch the appliance off immediately. Remove the
appliance’s main fuse. Do not use the appliance if damaged in any way. Contact customer services.
When pouring oil, fat, water or stock into the preheated hot boiling pan it may spray out. This action must
therefore be carried out by the appliance operator with due care.
Overheated fats and oils can ignite quickly in the hot boiling pan. Always take care when cooking with
fats and oils.
The use of corrosive, poisonous and inflammable substances in our cooking appliances is strictly
forbidden.
Practise particular caution if the food is bubbling. If the lid is opened with a slight residual excess
pressure, hot food may pour out and injure the operating staff.
Pay particular attention to simmer-delay. Simmer delay is the name of the phenomenon that under
certain conditions (e.g. on high mountains or plateaux where the air pressure is lower that at sea level)
liquids can boil at lower than 100°C and therefore can be heated beyond their boiling point without them
simmering, boiling or bubbling. This situation is dangerous because the slightest movement can quickly
cause a large steam or gas bubble to form that can then explode out of the cooking pot.
Our appliances are partially thermally insulated and insulated. The temperatures required for the cooking
processes in industrial cooking appliances, depending on the operating mode, mean that various parts
(e.g. cover areas, cladding panels etc.) can get hot. This is not a design fault but caused by the physical
phenomenon that stainless steel conducts heat.
Do not spray the appliance with water, steam or high pressure cleaners and do not pour water over it.
This appliance is not intended to be used by children and people with restricted physical, sensory and
mental faculties or who have a lack of experience and/or knowledge unless they are supervised by a per-
son responsible for their safety or have received instructions from this person on how the appliance
is to be used.
1.4.6 Handling industrial cooking appliances
The built-in stainless steel components for industrial cooking are made of high-quality and approved materials.
The sum of their positive characteristics makes them ideal materials for use in food preparation.
The reason the anti-rust stainless steel can resist corrosion is a passive layer which builds up when oxygen hits the
metal surface. There is sufficient oxygen in the air to do this.
If this passive layer is damaged by mechanical effects or damaged chemically and the passive layer is prevented from
regenerating itself (lack of oxygen) even rust-free stainless steel may corrode. It is possible to develop or regenerate
the passivity by treating it with running oxygen-rich water. Degenerative (oxygen starving) abrasives, such as substances
containing hydrochloric acid, chlorides and spice concentrates, mustard, vinegar essences, spice cubes and cooking salt
solutions can cause chemical damage or destruction of the passive layer depending on the concentration and the temper-
ature. In addition damage may occur due to external rust (small iron parts) by the formation of galvanised elements and by
lack of oxygen (no ventilation or low-oxygen water).
Note, therefore, the following principles when working with stainless steel appliances:
Keep stainless steel surfaces clean at all times and make sure they are well ventilated. Do not place the
lid on appliances when not in use so that air can get to the surface. Regularly wipe away any build-up of
lime scale, grease, flour and egg white. A layer of any of these substances can encourage corrosion by
starving the surface of air. De-scale the appliance with a solution of 10% vinegar, 10% phosphoric acid
or a suitable commercially available de-scaling solution.
Do not let stainless steel parts come into prolonged contact with acids, spices, salts, etc. Even acid
fumes which build up from cleaning tiled surfaces can promote corrosion. Rinse off work surfaces with
fresh water. This applies especially after cooking potatoes, pasta or rice in salted water. Dried-up cooking
water creates a highly concentrated salt solution which can quickly cause corrosion.
For this reason, rinse cookware immediately after use with fresh water or fill with cold water and leave to
cool down. It is uneconomical to use an appliance solely for the purpose of, for example, boiling potatoes
in salted water. Instead, with stainless steel it is sensible to fill the appliance with various types of food,
e.g. with soups with a high fat content or acidic vegetables (such as pickled cabbage).
Avoid mechanical damage to the stainless steel surface, especially by other metals. If stainless steel
comes into contact with iron (wire wool, swarf from cables, iron-rich water) this can lead to corrosion.
Remove fresh rust with a mild scouring agent or fine abrasive paper. Wash away stubborn rust with a
warm 2-5% oxalic acid solution.
If these cleaning agents do not work, treat the rust with 10% nitric acid.
Because of the risk involved, this treatment may only be applied by technically trained staff in accordance
with the applicable guidelines.
Information on cleaning the appliance (→see 1.6.3 Cleaning the appliance).