Eclipse ThermJet TJ0015 Design Manual page 14

Step 2:
Control Methodology
(continued)
Multiple burners
Automatic shut-off at the burner
Multiple burners
Automatic shut-off by zone
1
High/low air & gas control (pulse firing)
A burner system with high/low control gives a high or low fire
input to the process. No input between high and low fire is
possible.
1. Air
a. Low fire:
A control input closes the solenoid valve 4. As a result
the CRS valve 5 quickly moves to low fire.
b. High fire:
A control input opens the solenoid valve 4. As a result
the CRS valve 5 quickly moves to high fire.
2. Gas
a. Low fire:
A control input closes the solenoid valve 1.
Low fire gas passes through the butterfly valve 3.
b. High fire:
A control input opens the solenoid valve 1.
Figure 3.3:
to other Zones
P
Main gas
shut-off
valve train
to other Zones
P
Main gas
shut-off
valve train
Single burner
P
Main gas
shut-off
valve train
Eclipse ThermJet Design Guide No. 205, 3/5/07
High/Low air & gas control (pulse firing)
➍
➎
➊
➋
to other Zones
to other Burners
➌
➍
➎
shut-off by
➊
➋
to other Zones
NC
➌
➍
➎
➋
If fast high/low control is not necessary, the CRS valve can be
replaced with a two-position automatic butterfly valve.
to other Burners
NC
Automatic
shut-off at
the burner
to other Burners
Automatic
zone
to other Burners
➊
➌