Thermo Flame Failure Devic E - Dometic RM24A Service Manual

17.
THERMOELECTRIC FL&!! FAILURE SAFETY DEVICE (see fig, 58)
A l l models equipped with an automatic failure device.
S
A l l
gas operated or combined gas/electric refrigerator models dealt with in this
service instruction are equipped with an automatic failure device.
bly is to prevent unburned gas to escape from the burner and to avoid a fire hazard,
if, for some reason or other, the flame has been extinguished or blown out,
The safety device consists of the following parts:
1.
Spring loaded push button
2. Gas valve
3. Housing
Sensing clement with the hot junction of the
thermocoup le (Feeler)
Enamel insulated copper thread
6. Electromagnet
7. Outer tube
Armature
8.
9. Spring
The chttimoelectric safety device functions as follows:
By pressing the push button (1) the gas valve (2) is opened and the gas can pass c'e
housing (3) on to the burr.:r, At the burner the feeler (4) is located. When the gas
flame of the burner is lit, some heat is transferred to the feeler (4). The hot
junction of the thermocouple is thus heated and an electric current is g e n e r a t e d .
This current passes through the copper wire (5) to the electromagnet (6) and back
through the outer tube (7). As soon as the electric current is generated, the
electromagnet attracts the armature (8) with the valve (2). The push button can c'en
be released,
As long as current is flowing, the valOo is. kept open and allows gas to pass co :'-e
burner.
When the flame is extinguished, the heat transfer to the hot junction is interruFced
and no electric current is generated. The armature (8) with the valve (2) is tllen
forced back by the spring (9) and the gas flow through the valve (2) is c l o s e d .
Important: When lighting the burner the push button (1) should be pressed f irrl:r 2r.l
held in that position about 10 seconds, otherwise the gas may not get :o
the burner properly,
Fig. 58