Diagram help

[bwd111]

Which device protects the defrost heater from overheatinf?
Where should ohms be taken to check defrost contacts what terminals? I was thinking 3 aND 4 10843

[Rob White]

10844


Defrost thermal protection is in series with the heater
and the defrost contacts are 1 & 2 for the switch neutral
for continuity.


Rob

.

[bwd111]

10844


Defrost thermal protection is in series with the heater
and the defrost contacts are 1 & 2 for the switch neutral
for continuity.


Rob

.

Also which control contacts would you say would close and make the timer motor begin when the pressure in the frezzer temp control cap tube rises? would that be 1 and 2 as well

[mikeref]

Freezer thermostat powers up the defrost timer motor.

[bwd111]

Freezer thermostat powers up the defrost timer motor.

Looking at rthe diagram there is 1 and 2 ,1 and 3 1 and 4 and 2 and 4 . I was saying would 1 and 4 close? and the timer on the motor starts to run

[mikeref]

There two circuits, compressor run and defrost switched by the timer motor. Common leg is line 1. So when the timer is a closed circuit between 1 and 4, it is on your cooling cycle, 1 and 2 (As currently shown in drawing) is defrost. If the thermostat is open circuit, no power is available for either cycles and therefore no power to timer motor.
NB: Many timer motors were wired to run 24/7. This one isn't.

[bwd111]

There two circuits, compressor run and defrost switched by the timer motor. Common leg is line 1. So when the timer is a closed circuit between 1 and 4, it is on your cooling cycle, 1 and 2 (As currently shown in drawing) is defrost. If the thermostat is open circuit, no power is available for either cycles and therefore no power to timer motor.
NB: Many timer motors were wired to run 24/7. This one isn't. So after looking at diagram looks like 1 and 3 powers the timer motor

[Rob White]

So after looking at diagram looks like 1 and 3 powers the timer motor

Yes.............

Rob

.