Sterling 30 cfm, 60 cfm Setup Procedures, Checking for Proper Blower Rotation Three-Phase Models

3-4 Setup Procedures

This section provides the procedures necessary for configuring your Dehumidifying Dryer.

Configuration of your dryer includes checking for proper blower rotation, making dryer/drying hopper process air connections and the optional aftercooler (on 15 and 30 cfm models). We recommend that you carry out these procedures in the order given here.

Note: Before carrying out these procedures, install all equipment as described in this section.

Checking for Proper Blower Rotation

Three-Phase Models

Caution! In three-phase models, incorrect phasing of power leads can cause backward rotation of blower motors and CONTAMINATION OF THE DESICCANT!

Always check blower rotation before putting material in the drying hopper!

The blower is rotating properly when air flows from the delivery outlet.

Note: Holding your hand in front of the air return will also indicate if the blower rotates in the proper direction.

If the three-phase blower rotates improperly, reverse any two wires at the fused disconnect outside the dryer or at the disconnect/terminal in the control enclosure. This assures that the blower rotates in the proper direction.

Making Dryer/Drying Hopper Process Air Connections

Floor Mount Models

When making process air connections to your floor mounted dryer, ensure that you take into consideration and make arrangements for the following:

•Use high-temperature flexible dryer hose or rigid tubing to connect the dryer to the drying hopper.

•Keep the delivery hose to the drying hopper as short as possible to minimize heat loss. We strongly recommend insulated hose for maximum energy savings.

•Do not use insulated hose on the return from the drying hopper.

•The return air to the blower must be 150°F (66ºC) or below. If the return air temperature is not below this point, you should purchase and install the optional aftercooler to remove excessive heat. Consult the manufacturer for more information. Aftercooler considerations also apply to machine-mount models.

•Make sure that hoses are not kinked or collapsed.

•Drying hopper air inlet and outlet locations vary, but always connect hoses so the dry process air from the dryer enters the bottom of the drying hopper and flows out the top to return to the dryer inlet.

•Thermocouple is to be installed at drying hopper’s delivery tube.

15, 30, & 60 cfm Compact Dryers 17