Maxi Comet Executive Exec-56-G, Instruction Manual, Page: 92 / 244

Operating Principles Comet Executive Gas
5-12
Mechanical Start-Up Stage
This stage contains the sequence that occurs
when the unit begins operating without ignition
of the burner.
1. The green START button is pressed, the 24
VAC supply energizes control relay CR1,
and the green START button indicator
lamp comes on.
2. The CR1 contacts close:
• This allows START button to be re -
leased without de-energizing the start
relay.
• In addition, the closing of the CR1
contacts makes power available to the
gas control and safety circuitry.
• Simultaneously, a second set of CR1
contacts in the motor control circuitry
close, signaling the inverter to provide
power to the main drive motor.
• The ironing cylinder, feed ribbons, and
return ribbons begin to rotate.
Burner Operation Stage
This stage describes the sequence that occurs
during ignition, operation, and shut-down of the
burner.
1. With the unit running normally, power is
supplied to all gas system operating and
safety controls.
2. Before ignition can begin, the sail switch
(FS1) must be closed.
3. The heating phase begins when an opera-
tor sets the TEMPERATURE control dial
to a setting that is greater than the actual
temperature of the ironing cylinder:
• The ignition control opens the pilot
gas valve and provides power to the
ignition electrode.
• Once the pilot flame is proven, the igni -
tion control opens the main gas valve.
• The system will not call for heat again
until temperature drops 12º F below
set point.
• The high temperature limit control
(HLT1) is energized.
• If the control senses a high tem-
perature condition, it shuts down
the heating system.
• The unit must be given time to cool
down before the high temperature
limit control can be manually reset.
TOC INDEX