Programming instructions

Configuring variable stages

Variable stages control equipment that operates with gradually increasing voltage, such as variable

speed fans, or gradually decreasing voltage, such as heat mats. For more information about how

variable stages work, read

Programming variable stages

on page 46.

Configuring variable stages means:

 Entering a description for the stage

A good description helps you identify the stage more easily.

 Selecting the function

Not used, heating, or cooling

 Enabling tunnel mode (if required)

For more information about tunnel mode, read

Programming tunnel mode

on page 34.

 Selecting a motor curve (PBx AC cooling stages only)

For more information about motor curves read

Appendix B: Motor curves

on page 90.

Only functions that are available for the model of Power Block will display. Only

options that are available for the selected function will display.

For example, motor curve selection will not display until you select Cooling for an

AC variable stage.

Use the

Installation and configuration worksheets

when configuring Power Blocks.

The worksheets are in the back of the

Power Block installation guide

Variable-speed fan example

Heat mat example

Temperature

Increased voltage and speed Decreased voltage