H
OW
I
T
W
ORKS
GasTrac Gas-Fired process Air Heater
UGD014/0497
2-4
D
ESCRIPTION
ESC
SEL
Combustion
Blower
RUN
MAN
234.0
250.0
SP2
OP1
OP2
REM
HOLD
2216
ESC
SEL
The GasTrac has three interfaced controls that:
●
Ignite the metal-ceramic burner and monitor the GasTrac
combustion circuit.
●
Heat the dry air to the setpoint temperature.
●
Monitor the air temperature as it enters the drying hopper.
●
Automatically adjust the mixture of combustion air and
gas to maintain the setpoint temperature.
Temperature
RTD probe at
the hopper
inlet
The Temperature Controller
You enter the setpoint temperature in the Temperature Controller on the
main GasTrac control. The temperature controller monitors temperature at
the drying hopper inlet. When the actual temperature must increase or
decrease to maintain setpoint, this controller sends a 4 to 20 MA signal to
the variable speed controller.
Burner Controller
The Burner Controller is activated
when you press the
RUN
button on
the main GasTrac control. The burner
controller sends a signal to the spark
igniter, which fires the metal-ceramic
burner. This controller continues to
monitor the fuel train, combustion
blower and other combustion systems
for possible problems.
Variable Speed Controller
The Variable Speed Controller automatically adjusts the speed of the combustion
blower by varying the frequency and voltage of the signal. Increasing the speed
increases the air-to-fuel mixture and the heat output of the burner.
4 to 20 MA
signal
varying
frequency