NTC

18:25 Mar 1, 2015

This question was closed without grading. Reason: Answer found elsewhere

French to English translations [PRO]
Tech/Engineering - Electronics / Elect Eng / Air conditioning controls

French term or phrase: NTC

The term appears in a report of a technical investigation on the malfunctions of fresh air dampers in an air conditioning system (the dampers remain stuck on closed). The term I am after is NTC, which (I believe) is a control unit.
"Problématique XXXXX [name of company experiencing problem] : il s’avère que :
Pour une tension maximum d’alimentation de la vanne d’AN de 28,8 V nous ne devrions pas dépasser une tension d’alimentation de 240.5 V.
Si on considère que la FT XXXXX du *NTC* préconise un fonctionnement à 230 V +/- 10% et par conséquent compris entre 207 et 253 V, nous risquons d’avoir un problème par rapport à la conclusion ci-dessus si YYYYY [name of company that supplied air dampers] approfondis son analyse.
Le risque actuel est de devoir remplacer 2628 vannes YYYYY ainsi que les 2628 *NTC* correspondantes dans des locaux de bureaux occupés."

All suggestions are welcome.

Marco Solinas KudoZ activity Questions: 339 (none open) (32 closed without grading) Answers: 2359
Local time: 06:01

Summary of answers provided

1 +1

NTC thermistor

Tony M

Discussion entries: 6

Marco Solinas

ASKER

Thanks all around

20:16 Mar 2, 2015

I found the catalogue of the manufacturer. NTC stands for New Terminal Controller. Both the name and aronym seem to be specific to this manufacturer. Naturally, NTC will stay unchanged. Thank again.

chris collister

France

14:02 Mar 2, 2015

I share the collective doubts about the unique sense of NTC: a thermistor is generally a tiny device which carries a minuscule current, sufficient only to drive some other circuit controlling a relay or thyristor. And does this number 2628 refer to the quantity of thermistors (that's a lot of thermistors), in which case why replace all of them (and the 2628 valves/shutters)?

Marco Solinas

ASKER

To: Johannes

13:40 Mar 2, 2015

The rest of the document indicates that the control unit contains a transformer that delivers a voltage of 24 V AC.

The cause(s) of the malfunction had not been identified at the time the report was written, but a fault in the motor that drives the damper is strongly suspected.

Johannes Gleim

@ Marco

10:40 Mar 2, 2015

I assume that the nominal supply voltage to the solenoid is 24 V and the upper voltage is 28.8 V. Is this voltage supplied by the control or from other sources (transformers, PSU, etc.)?

A NTC (negative temperature coefficient thermistor) cannot deliver supply voltages. It only determines the current. Moreover, a NTC has no assigned rated voltage, but rated resistance, temperature coefficient, admissible power dissipation, etc. See datasheet http://www.murata.com/~/media/webrenewal/support/library/cat...

If the "NTC" is a PSU, then the guess is solved and "NTC" must be read elsewhere. If it is a thermistor, than the context is incomprehensible.

It would be nice to answer these questions and to add further context. Can you also describe, what the reason of malfunction was, and how this failure will be solved? And pleas give us the missing link between the malfunction and the discussion about "NTC" and voltages.

@ Chris: AN = "Air Neuf" makes sense.

chris collister

France

@Johannes

08:12 Mar 2, 2015

AN usually means "air neuf", ie fresh air in an HVAC context.

Johannes Gleim

Problems to understand

23:47 Mar 1, 2015

If the control 'NTC' functions between 207 V and 253 V (standard requirement), why must the supply voltage be limited to 240.5 V? Note: 242 V is equal to 220 V +10 % (upper limit of former continental voltage standard), 240 V was former UK nominal voltage.
Why depends the supply voltage on the valve 'AN'?
What means 'AN'?

Answers

9 mins confidence:

peer agreement (net): +1

NTC thermistor

Explanation:
I was going to suggest this, as being the usual translation — but then you say you think it is some kind of controller.

That could indeed be what the 'NTC' stands for — but you may also need to consider that whatever kind of control unit it is, it is thus named because its key component is indeed an NTC (= negative temperature coefficient) thermistor — commonly used for the purposes of sensing temperature, and thence forming some kind of controller.
NTC means that as the temprature rises, the resistance of the element falls, thus providing the basis for a control mechanism (thermostat).

Tony M
France
Local time: 15:01
Specializes in field
Native speaker of:

English
PRO pts in category: 2116

Notes to answerer

Asker: I think you are right Tony. They use the term (throughout the document) to indicate a control unit that uses an NTC thermistor as the sensing element.

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