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350-2100 cfm Dryers Chapter 5: Startup, Shutdown & Operation 27 of 58
Chapter 5: Startup, Shutdown & Operation
5-1 Pre-Startup Checks
; Check the process and return hoses for tight connections.
; Check that all companion equipment, such as the drying hopper, loading system and aftercooler are
ready for operation.
; Check the dryer electrical connections.
Note: Clean the rust-preventive oil from inside the drying hopper. Failure to clean the hopper
will cause fouling of the desiccant in the dryer, and will void the warranty.
5-2 Startup
Close the slidegate at the bottom of the drying hopper.
1. Fill the drying hopper with material.
2. Turn on (energize) the disconnect switch in your power drop, then turn on the one on the dryer.
3. Flip the on/off switch to "ON."
4. Press the stop/start button.The blowers should start, and the proper control panel indicators
should light.
5. Make sure both blowers are turning the right direction. Verify rotation direction is correct. If
one or both blowers do not start:
• Check to see if an overload on the blower motor starter has tripped. If so, set it
properly and reset. Check the blower fuses, too.
• If one of the optional Valve Position Error lights is lit, the blowers will not start.
Make sure the valve arm has tripped the proper limit switch. If the electric
actuator is not fully extended or retracted, check the line fuse (8FU) near the
actuator's 24 VDC power supply.
• If a blower failure light is lit after the blower has run for a few seconds and shut down, the blower
pressure switch will need to be adjusted until the failure light goes out.
The valve actuator has built-in limit switches to shut off its motor.
It must fully extend and retract to prevent the motor from burning out.
The pressure switches at the rear of the dryer were adjusted during
factory-testing. Pressure changes in the drying system as installed
may make some adjustment to these necessary during initial startup.