Lanair HI320 - Manual (Page 31)

SECTION 12 CONTINUED
12.3 Fan/Limit Control (continued):
The Fan/Limit Control contains an external slide switch to turn the axial fan
on manual by-passing its automatic function.
The Fan/Limit Control monitors the temperature of the air inside the
cabinet. When the temperature exceeds a fixed set point it switches the
burner (Oil Primary Control) off until the temperature drops to a safe level.
The burner will then restart.
“CAUTION” This means the heater has reached its “High Limit”, the cause
must be determined and corrected before further use (overfiring the unit is
normally what causes this condition). The Fan/Limit Control is located on
the top on the front of the cabinet.
12.4 Barometric Draft Control:
The Barometric Draft Control automatically maintains a pre-set chimney
draft, and is located in the chimney connector.
12.5 Air Filter/Regulator:
The Air Filter/Regulator performs two functions:
1. It removes condensation and dirt from the air.
2. It controls the amount of air pressure reaching the nozzle and
air operated fuel valve.
The Air/Filter Regulator is mounted on the cabinet near the burner.
12.6 Electric Air Solenoid Valve:
The Electric Air Solenoid Valve is controlled by the Oil Primary Control. It
acts as a shut-off valve, (it’s open during operation, and closed when the
burner is off).
The Electric Air Solenoid Valve is located inside of the burner’s electrical
box (See page 18E).
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