Sterlco SHA Series Hot Air Dryer - Manual (Page 11)

Hot Air Dryers Chapter 4: Startup and Operation 11 of 17
Chapter 4: Startup and Operation
4-1 Introduction
Air is drawn through a permanent electrostatic, washable filter, by a centrifugal blower. The
air is blown through the process heater box where it is heated to the appropriate drying
temperature. The temperature is controlled by a solid-state temperature controller which
includes a built-in process air safety to prevent material meltdown. Heated air is then
directed either through an air diffusor assembly in an existing machine hopper or a drying
hopper. These hopper combinations provide even air distribution through materials for
maximum drying efficiency. The moisture-laden air is then discharged into the atmosphere.
4-2 Pre-Startup Checklist
Before you start the dryer, check the following:
; Make sure that all hose connections are correct.
; Make sure that the air filter is in place.
; Make sure that all electrical connections are complete and the control
enclosure door is closed.
4-3 Starting the Dryer
1. Hot air dryers feature a disconnect switch on the control cabinet. This switch must
be placed ON and the ON/OFF switch placed ON to operate the dryer. When the
ON/OFF switch is in the ON position, a power lamp will light.
2. Set the process air temperature control knob to the desired temperature and an amber
Air Heat lamp will light when the heaters are on.
3. Operation of the dryer is completely automatic requiring no further attention once the
unit is running and the temperature is set.
Note: A built-in safety will open if a high temperature condition exists. If this should
happen, both indicating lamps and the unit will shut off. Motor overload and
control circuit protection are provided in the control cabinet.
4-4 Shutting Down the Dryer
To shut down the hot air dryer:
1. Turn the ON/OFF switch to the OFF position.
2. Turn the disconnect handle to the OFF position.