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The Government of Canada’s terminology and linguistic data bank.
TURNDOWN RATIO [2 records]
Record 1 - internal organization data 2000-04-28
Record 1, English
Record 1, Subject field(s)
- Gas and Oil Heating
- Burners and Steamfitting
Record 1, Main entry term, English
- pilot turndown test
1, record 1, English, pilot%20turndown%20test
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
A test to determine if the smallest pilot capable of holding in the flame relay is large enough to safely light off the main burner. 1, record 1, English, - pilot%20turndown%20test
Record number: 1, Textual support number: 1 OBS
turndown : the ratio of the maximum usable flow to the minimum controllable flow through a valve; usually somewhat less than the rangeability, as the maximum usable or required flow is usually less than the total flow capacity of a valve. 1, record 1, English, - pilot%20turndown%20test
Record number: 1, Textual support number: 2 OBS
See record "valve turndown / marge de réglage effective." 2, record 1, English, - pilot%20turndown%20test
Record 1, French
Record 1, Domaine(s)
- Chauffage au gaz et au mazout
- Fumisterie et brûleurs
Record 1, Main entry term, French
- test de réglage de la veilleuse
1, record 1, French, test%20de%20r%C3%A9glage%20de%20la%20veilleuse
proposal, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 OBS
Voir la fiche «marge de réglage effective / valve turndown». 1, record 1, French, - test%20de%20r%C3%A9glage%20de%20la%20veilleuse
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 2000-04-28
Record 2, English
Record 2, Subject field(s)
- Burners and Steamfitting
Record 2, Main entry term, English
- modulating fire
1, record 2, English, modulating%20fire
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, Textual support number: 1 CONT
modulating fire. Varying the firing rate as the load varies. This results in longer burner operation because the firing rate is lowered as temperature or pressure builds up toward the cutoff point. It decreases on-off operation and increases the efficiency of the system. 2, record 2, English, - modulating%20fire
Record number: 2, Textual support number: 2 CONT
There are four widely used operating configurations for gas fired appliances : modulating fire, on-off, hi-low, and multi-stage firing. Modulating fire is accomplished by mechanically varying the size of the gas admittance opening of one or more special "modulating" gas valves. With the gas valve completely open the boiler fires at it's full fire rate. The unit is said to be at "full turndown" when it fires at it's lowest firing rate. The "turndown ratio" is the ratio of full fire rate to full turndown firing rate and is a function of boiler design. A turn down ratio of 5 : 1 would indicate that a boiler is capable of a full turndown firing rate of 20%(5 : 1(100% fire : 20% fire). 3, record 2, English, - modulating%20fire
Record number: 2, Textual support number: 1 OBS
modulating control: a method of control capable of increasing or decreasing by increments a quantity according to deviation from the required value. 4, record 2, English, - modulating%20fire
Record 2, French
Record 2, Domaine(s)
- Fumisterie et brûleurs
Record 2, Main entry term, French
- allure progressive
1, record 2, French, allure%20progressive
proposal, feminine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
- allure modulante 1, record 2, French, allure%20modulante
proposal, feminine noun
Record 2, Textual support, French
Record number: 2, Textual support number: 1 OBS
Les brûleurs de gaz à air soufflé Piroil sont fournis sous forme monobloc, précâblés et prêts pour le fonctionnement. Construits pour une puissance thermique de 30.000 à 2.5000.000 Kcal/h dans les versions suivantes: une allure, deux allures, progressifs [...] Fonctionnement. Le cycle de travail prévoit au démarrage une période de prébalayage de la chambre de combustion avec le clapet d'air complètement ouvert, et obtenue à l'aide du servomoteur. Durant cette période l'éléctrovanne est fermée. À la fin de cette phase, avec le clapet d'air et le manchon gaz positionnés à une valeur minimale par le servomoteur, l'électrovanne gaz est excitée et le transformateur pourvoit à l'allumage du gaz au débit minimum. À ce moment, après avoir obtenu le consentement de présence de flamme par l'électrode d'ionisation, la boîte de contrôle met en marche le servomoteur air-gaz qui porte le brûleur, progressivement, dans un délai préétabli, à sa puissance maximale. Le brûleur reste en ces conditions de travail jusqu'à atteindre la température maximale, après cela, toujours thermostatiquement, à l'aide du servomoteur, on stabilise la puissance à un régime minimal, jusqu'à la demande de chaleur par la chaudière, qui peut être réétablie avec une modulation successive, sans pourtant interrompre complètement le fonctionnement. 2, record 2, French, - allure%20progressive
Record number: 2, Textual support number: 2 OBS
régulation modulante : mode de régulation opérant par action de faible amplitude autour de la valeur désirée. 3, record 2, French, - allure%20progressive
Record 2, Spanish
Record 2, Textual support, Spanish
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