- Jul 18, 2009
- 11,938
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So,
12v
12v Supply into 3 & 4
NTC to 5 & 6
12v load out to 1 & 2 ?
12v
12v Supply into 3 & 4
NTC to 5 & 6
12v load out to 1 & 2 ?
A simple wiring Diagram - Help me get my head around it please?
- Thread starter EuroTrotters
- Start date
OP
OP
- Jul 18, 2009
- 11,938
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- Funster No
- 7,543
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- 2004
hilldweller
LIFE MEMBER
Correct but the worry is no polarity indicated in the picture.
OP
OP
- Jul 18, 2009
- 11,938
- 20,005
- Funster No
- 7,543
- MH
- HYMER B644
- Exp
- 2004
is that a resistor symbol?
Lenny HB
LIFE MEMBER
- Oct 18, 2007
- 58,146
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It's a Thermistor.
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?The load is shown across 2 and 4 surely ?
A thermistor is a resistor whose resistance value is designed to vary with temperature.
An NTC Thermistor = Negative Temperature Coefficient resistor. In other words, as it gets hotter, the resistance gets lower. In contrast to a PTC (= Positive Temperature Coefficient) - as it gets hotter, the resistance gets higher.
If I had to guess the polarity, I'd say that usually the switch is in the positive supply. That means that positive is to 1 and 3. Therefore negative is to 4 and the Load. However it is certainly possible that the switch is in the negative supply, so I could easily have guessed wrong.
An NTC Thermistor = Negative Temperature Coefficient resistor. In other words, as it gets hotter, the resistance gets lower. In contrast to a PTC (= Positive Temperature Coefficient) - as it gets hotter, the resistance gets higher.
If I had to guess the polarity, I'd say that usually the switch is in the positive supply. That means that positive is to 1 and 3. Therefore negative is to 4 and the Load. However it is certainly possible that the switch is in the negative supply, so I could easily have guessed wrong.
Looks like an electronic fridge controller, the load will be compressor or mag valve, and the L & N markings are out of shot.
Live into 1 and loop it into 3.
2 live out to comp (or Mag Valve)
4 neutral
Comp needs a neutral {of course) from somewhere too ?
2 live out to comp (or Mag Valve)
4 neutral
Comp needs a neutral {of course) from somewhere too ?
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OP
OP
- Jul 18, 2009
- 11,938
- 20,005
- Funster No
- 7,543
- MH
- HYMER B644
- Exp
- 2004
cheap Chinese fridge controller
Is for on of those expensive mobile chiller/freezers £600 but the NTC has failed and its foamed in. Manufacturer cannot be traced. This one is Branded Snooper. Spoken with RuncornHQ and they haven tech info.
S0, going to bypass the internal boards and wire this direct to 12v Compressor
OP
OP
- Jul 18, 2009
- 11,938
- 20,005
- Funster No
- 7,543
- MH
- HYMER B644
- Exp
- 2004
Yes, thanks. I know its an NTC Thermistor, just the x in the box?
Lenny HB
LIFE MEMBER
- Oct 18, 2007
- 58,146
- 179,553
- Funster No
- 658
- MH
- Carthago Compactline
- Exp
- Since 2008 & many years tugging
It's the symbol for a controller.
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