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8.5 Heater unit
1 - Filament heating element
2 - Ceramic supports
3 - Sheet metal casing
4 - Safety thermostat N.C. (automatic reset)
5 - Safety thermostat N.C.
General features:
The heater unit consists of two wire heating elements with different powers. The heating elements are fitted
to ceramic supports, and the entire assembly is contained in a sheet metal casing.
On one side of the casing are fitted the two safety thermostats normally closed, an automatic reset (4)
intervenes at 92°, while the other thermostat (5) intervenes at 160° and it remains open.
The heater units mounted are of three types: 2000W (1400+600), 2200W (1400+800),
2400W (1400+1000).
IN CASE OF A THERMOSTAT FAILURE THE HEATER UNIT MUST BE REPLACED
Checking the efficiency:
The efficiency of the heater unit can be checked by measuring the resistance of each element.
1400 + 600 W (230v) heating elements.
~
Branch A ohm
33
~
Branch B ohm
78
1400 + 600 W (240v) heating elements
~
Branch A ohm
36
~
Branch B ohm
85
1400 + 800 W (240v) heating elements
~
Branch A ohm
36
~
Branch B ohm
XX
1400 + 1000 W (240v) heating elements
~
Branch A ohm
36
~
Branch B ohm
51
Colour key
Red
– rosso
– rouge
Blue
– blu
– bleu
Black
– nero
– noir
White – bianco
– blanc
The TH1 and TH2 thermostats, being N.C. (normally closed) do not have any heating element.
SOI/DT 2002-07 dmm
(contacts 1-4)
(contacts 2-4)
(contacts 1-4)
(contacts 2-4)
(contacts 1-4)
(contacts 2-4)
(contacts 1-4)
(contacts 2-4)
– rot
– blau
– schwarz
– weiss
13/55
ELECTRIC WIRING
599 35 38-32
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