7
Eclipse ThermJet Self-Recuperative, V5, Design Guide 208, 9/16/2011
High/Low Control
The firing rate is adjusted at two positions, the high and
low fire set points. The burner remains on during the full
process cycle. When the system is set to high/low control:
1. Manual butterfly valve sets high fire air flow rate.
2. Solenoid valve opens for high fire air flow and closes
for low fire air flow.
3. Manual butterfly valve sets low fire bypass air flow.
4. Manual butterfly valve balances the air flow for burner
(multiple burner installation).
5. Ratio regulator adjusts gas flow as loading line
pressure changes due to air pressure changes.
6. Manual butterfly valve sets high fire gas flow.
Figure 3.1 High/Low Control
High/Low Control
(single burner)
High/Low Control
(multiple burners, shut-off by zone)
Main Gas
Shut-Off
Valve Train
Main Gas
Shut-Off
Valve Train
Main Gas
Shut-Off
Valve Train
To Individual
Burner Piping
High/Low Control
(multiple burners, shut-off by burner)
To Other
Zones
To Other
Zones
To Other
Zones
To Other
Zones
