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D. Gas Burner Assembly
Gas-heated dryers are equipped with a gas
burner assembly consisting of three (3) burner
tubes, gas valve, glo bar, flame sensor, sail
switch, and hi-limit thermostat. The inlet
piping enters through the rear of the dryer on
the left-hand side (viewing from the front)
and runs to the front of the dryer where the
gas valve is located.
C. HSI Module (Gas Models
Only)
The HSI system consists of a microprocessor-
based control module, along with a hot surface
ignitor probe and a flame probe assembly. The
hot surface ignitor is a silicon carbide ignitor that
upon application of 24VAC will glow bright
orange for the inter-purge time period. Upon
ignition, the resistance in the flame sensor
electrode changes and the information is sent
to the HSI module via the sensor probe lead
connection to the module. Once the resistance
is changed and sensed, the HSI module will
sustain the gas flow (provide 24VAC power to
the gas valve).