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8

ThermJet, V2, Technical Information, Edition 2.14

Modulating Gas & Air 

On-ratio Control or Excess Air @ Low Fire (Figure 3.1)

A burner system with modulating control gives an input

that is in proportion with the demands of the process. ANY
input between high and low fire is possible.

1. Air:

The control valve 

 is in the air line. It can modulate

air flow to any position between low and high fire air.

2. Gas:

The ratio regulator 

 allows the on-ratio amount of

gas to go to the burner. Low fire gas is limited by the
ratio regulator 

. High fire gas is limited by the

manual butterfly valve 

NOTE:

 The ratio regulator can be biased to give excess

air at low fire.

NOTE:

 Do not use an adjustable limiting orifice (ALO) as

the high fire gas limiting valve 

. ALO’s require too much

pressure drop for use in a proportional system. 

Figure 3.1  Modulating Gas & Air (On-Ratio Control or Excess Air @ Low Fire)

Multiple Burners

Automatic Shut-Off at the Burner

Multiple Burners

Automatic Shut-Off  by Zone

Single Burner

NC

NC

NC

P

to other Zones

to other Burners

Main gas 

shut-off

valve train

to other Burners

Automatic
shut-off at

the burner

Main gas 

shut-off

valve train

P

to other Zones

to other Burners

Automatic

shut-off by

zone

to other Burners

to other Zones

Main gas 

shut-off

valve train

P

Optional IF flame monitoring system controls the main gas shut-off
valve train AND ignition above 40% of maximum is NOT required.

Summary of Contents for ThermJet TJ0015 - 2000

Page 1: ...Eclipse ThermJet Burners Model TJ0015 2000 Version 2 Technical Information Edition 2 14...

Page 2: ...and Eclipse will not be liable for any other injury loss damage or expenses whether direct or consequential including but not limited to loss of use income or damage to material arising in connection...

Page 3: ...apabilities 5 Operator Training 5 Replacement Parts 5 3 System Design 6 Design 6 Step 1 Burner Model Selection 6 Step 2 Control Methodology 7 Step 3 Ignition System 12 Step 4 Flame Monitoring Control...

Page 4: ...er Audience This manual has been written for people who are already familiar with all aspects of a nozzle mix burner and its add on components also referred to as the burner system These aspects are D...

Page 5: ...by sanding sawing grinding cutting and other construction activities could release crystalline silica Crystalline silica is known to cause cancer and health risks from the exposure to these chemicals...

Page 6: ...ased on requirements for temperature uniformity circulation chamber size air pressure and overall operating costs Flame velocity information is available in Datasheets 205 1 through 205 13 Fuel Type T...

Page 7: ...on page 9 2 High low control a High low air gas control pulse firing on page 10 b High low gas with fixed air control Can also be used for pulse firing on page 11 NOTE Use of a ratio regulator in a f...

Page 8: ...lator can be biased to give excess air at low fire NOTE Do not use an adjustable limiting orifice ALO as the high fire gas limiting valve ALO s require too much pressure drop for use in a proportional...

Page 9: ...r eliminating the ratio regulator will adversely affect the ignition reliability at inputs greater than 40 of maximum Figure 3 2 Modulating Gas with Fixed Air Control Optional IF flame monitoring syst...

Page 10: ...the solenoid valve Low fire gas passes through the butterfly valve b High fire A control input opens the solenoid valve Figure 3 3 High Low Air Gas Control Pulse Firing NC Automatic shut off by zone...

Page 11: ...en solenoid valve NOTE Use of a ratio regulator in a fixed air system is optional on a single burner system only However eliminating the ratio regulator will adversely affect the ignition reliability...

Page 12: ...ollow the control circuits described in the previous section Control Methodology to obtain reliable ignition Local safety and insurance require limits on the maximum trial for ignition time These time...

Page 13: ...lve in the bypass line plus the automatic gas shut off valve either at each burner or each zone are opened If a flame is established the bypass solenoid valve closes at the end of the trial for igniti...

Page 14: ...is detected may prevent establishment of flame particularly when using UV scanners The flame monitoring control must maintain the spark for a fixed time interval that is long enough for ignition DO N...

Page 15: ...ber and motor horsepower hp With the output pressure and the specific flow you can find the blower catalog number and the motor hp in Bulletin 610 4 Eclipse recommends that you select a totally enclos...

Page 16: ...can help you design and obtain a main gas shut off valve train that complies with the current safety standards The shut off valve train must comply with all the local safety standards set by the autho...

Page 17: ...illimeter mm inch in 3 94 x 10 2 MJ Nm Btu ft standard 26 86 From To Multiply By kiloPascals kPa millibar mbar 10 meter m millimeter mm 1000 millibar mbar kiloPascals kPa 0 1 millimeter mm meter m 0 0...

Page 18: ...ne This impulse line is connected between the top of the ratio regulator and the burner body Main Gas Shut Off Valve Train Eclipse strongly endorses NFPA as a minimum 790 791 Pilot Gas Valve Train Ecl...

Page 19: ...anual reset version requires pushing a button to transfer the contacts when the pressure set point is satisfied 840 Pressure Gauge A device to indicate pressure 940 Check Valve A check valve permits f...

Page 20: ...Eclipse Inc All Rights Reserved...

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