ZONE TEMP light on 737-800

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ZONE TEMP light on 737-800

Postby yayoo » 27 Jan 2015, 07:52

When we shut off the APU and use the BAT power only,the ZONE TEMP light for control cabin will on,for the fwd cabin and aft cabin will off.I known it is a normal conditon,but why the ZONE TEMP light for control cabin is on only?
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Re: ZONE TEMP light on 737-800

Postby vitaly » 27 Jan 2015, 19:39

You can found answer - difference at ssm21-61-11 and 21-61-13
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Re: ZONE TEMP light on 737-800

Postby yayoo » 28 Jan 2015, 04:07

I can not found the difference, can you tell me the details?
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Re: ZONE TEMP light on 737-800

Postby motortek » 28 Jan 2015, 18:12

firt off all u must know why zone temp lıght illuminate ? when power come or goes ? 28 v dc battery bus supply elec. other zones because of that theirs lamps are not illuminates but control cabin system needs 115 v ...
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Re: ZONE TEMP light on 737-800

Postby scetin61 » 04 Feb 2015, 14:04

if you inspect SSM 21-61-11 and SSM 21-61-13, you can see that p5-10 Air Conditining Panel logic diagram. In the control cabin part, you can see that how many possibility that illuminates zone temp light. On the other hand, when you look at fwd zone part you will that logic thats illuminates FWD CONT light is depends on PRIMARY FWD ZONE FAULT and BACKUP FWD ZONE FAULT. If you know some logic circuit, you will realise that this 2 condisiton makes the exthinguish the FWD ZONE CONTR. Its also same like AFT ZONE.

I think it helps ;)
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Re: ZONE TEMP light on 737-800

Postby yayoo » 08 Feb 2015, 10:50

But with the BAT power on only,the PZTC have lost power,what it the logic circuit input from ZPTC?
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Re: ZONE TEMP light on 737-800

Postby yayoo » 11 Feb 2015, 18:04

How to oprate this logic in WDM21-61-11,the input and the output conected?
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