R-222STM (serv.man2) - Sharp Home Appliance User Guide / Operation Manual. Page 3

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GB-2
ENGLISH
 HEATING 
CATEGORY
Microwaves will pass through certain materials, such as glass and 
plastic, to heat the food. (See 'Suitable Ovenware' on page GB-
16
).
Water, sugar and fat in food absorb microwaves which cause them to 
vibrate. This creates heat by friction, in the same way your hands get 
warm when you rub them together.
The outer areas of the food are heated by the microwave energy, 
then the heat moves to the centre by conduction, as it does in con-
ventional cooking. It is important to turn, rearrange or stir food to 
ensure even heating.
Once cooking is complete, the oven automatically stops producing 
microwaves.
Standing time is necessary after cooking, as it enables the heat to 
disperse equally throughout the food.
Microwaves are energy waves, similar to those used for TV and radio 
signals.
Electrical energy is converted into microwave energy, which is 
directed into the oven cavity via a waveguide. To prevent food and 
grease entering the wave guide it is protected by the waveguide 
cover.
Microwaves cannot pass through metal, because of this the oven 
cavity is made of metal and there is a fi ne metal mesh on the door. 
During cooking the microwaves bounce off the sides of the oven 
cavity at random.
 HOW 
YOUR 
OVEN 
WORKS
The heating category (a letter A to E) developed by MAFF (Ministry of Agriculture, 
Fisheries and Food) with microwave oven and food manufacturers indicates the 
ability of the oven to heat small quantities of food (up to 500g [ I lb 2oz]). It does 
not represent the general performance of the oven.
Food packs carry cooking instructions for heating categories A to E. Follow 
instructions for the letter corresponding to the oven's heating category. The 
higher the output power and heating category of the oven the less heating time is 
required as shown opposite.
Microwave output power 
in Watts (based on 
international (IEC 60705) 
standard).
Letter representing the 
oven heating category. 
Microwave Symbol.
OVEN 
OUTPUT 
POWER
Less heating time required
600 700 800 900 1000 Watts
More heating time required
OVEN 
OUTPUT 
CATEGORY
Less heating time required
A B C D E
More heating time required
Microwave Symbol.
Microwave output power 
in Watts (based on 
international (IEC 60705) 
standard).
Letter representing the 
oven heating category. 
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