FloAire Compact Direct Fired Heater - Manual (Page 19)

19
High Temperature Limit
High Temperature Limit
One of the back up safety device is the high temperature limit switch.
This switch is a mechanical thermostat that measures the temperature
inside the unit downstream of the burner. If the factory-set temperature
of 180°F is exceeded, it will signal the FSC to turn off the burner. This
requires a manual reset of the high temperature limit. This insures that
the discharge does not exceed 185°F.
Operation Summary
With the blower already running and the airflow switch proven;
The outside air temperature falls below the setting of intake air thermostat
or
The optional remote panel is set to “Manual” and “Heat” mode
•
The FSC in energized and the following occurs;
FSC indicates that it has power
FSC verifies proper Airflow
Begins a 15 second Pilot Trial For Ignition
The pilot gas solenoid valve is opened, the spark igniter begins sparking, and the flamerod
sensor watches for flame initiation
When flame is established, the main valve opens and the FSC powers the Maxitrol system
and gas flow begins modulating
The FSC monitors the flame while the Maxitrol system adjusts to the selected temperature
• The Maxitrol system checks the discharge air temperature (and the room temperature for the Maxitrol
44) and regulates the gas going to the burner to satisfy the temperature setting. The Maxitrol system
will modulate the main burner gas from 100% down to 5% as needed.