DriSteem HUMIDI-TECH DI Guide d'installation télécharger pdf (Page 11)

DRI-STEEM Vapor-logic

*OTUBMMBUJPOBOE0QFSBUJPO.BOVBMt1BHF

STS and LTS valve modulation

With a valve system, the demand signal simply determines how far

the valve strokes. In other words, if the system demand is 25%, the

valve strokes 25%.

GTS burner modulation

A GTS burner assembly consists of a variable speed blower, a

constant air/gas ratio modulating gas valve, and a burner. The

burner output modulates from its minimum capacity up to its

full-rated capacity. To modulate the output, Vapor-logic

controls

the combustion air blower’s speed. As the blower speed varies,

the gas valve automatically adjusts the amount of gas introduced

into the burner to maintain a constant air/gas ratio. This variable

combination of gas and air results in clean combustion over the

entire range of the burner capacity.

When system demand dictates that an individual burner must

operate below its minimum output capability, burner operation

changes from modulated to time proportioned (TP), meaning that

the burner output is kept constant while it is on, but is cycled on

and off. The burner cycle time is two minutes, and the burner on

time is determined by the system demand.

To ignite the burner, the blower is run at a speed optimized for

ignition to provide the smoothest, quietest, most reliable ignitions.

If the tank is cold, the unit runs at 100% capacity to preheat the

tank. Once the tank temperature rises above 190 °F (88 °C), the

burner output is determined by system demand. In a multiple

burner system, one burner is always operating when there is

demand, while the other burners may or may not be operating

depending on system demand. Once all burners are off, the

ignition order reverses upon re-ignition to maintain even wear on

combustion system components.

7BMWFBOECVSOFSNPEVMBUJPO

VL3_IOM.pdf 11 11/19/2009 9:11:05 AM

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 107 108

Pas de commentaire

DriSteem HUMIDI-TECH DI Guide d'installation Page 11