1. PROGRAMMING

T775A/B/M SERIES 2000 CONTROLLER

1. PROGRAMMING

The controller must be programmed before being placed into service.

IMPORTANT

During programming, the controller is live at all times. For example, the contacts may open and close when adjusting the setpoint.

The Programming process uses a hierarchical menu structure that is easy to use. You press the W and X arrow buttons to move forward and backward through the menus.

NOTES:

1.The controller interface is intuitive. You may find that you do not need the following proce- dure instructions to program the controller.

You may want to use this procedure simply as a reference to locate the particular option or parameter of interest.

2.The menus can display only those relays that are defined in Setup (see “2.3.2. NBR OF RELAYS” on page 24). For example, if you configure only two relays, then only two relays display on the appropriate menus.

3.If you press the HOME button or there is no keypad activity for four minutes, you exit Pro- gram mode and return to the home screen.

4.If you press the MENU button, you exit Pro- gram mode and return to the menu.

Setpoint and Differential

The following describes the relationship between setpoint and differential for heating and cooling. These settings are programmed for each output relay.

Heating Mode Setpoint and Differential

In heating mode, the differential is below the setpoint. The relay de-energizes when the temperature rises to the setpoint. As the temperature drops to the setpoint minus the differential, the relay energizes.

Cooling Mode Setpoint and Differential

In cooling mode, the differential is above the setpoint. The relay de-energizes when the temperature falls to the setpoint. As the temperature rises to the setpoint plus the differential, the relay energizes.

Setpoint High Limit

You can set a single irreversible setpoint high limit maximum value, which is applied to all outputs.

Adjust the setpoint (at any output) to the desired maximum setpoint. Then, simultaneously press the home, W, and X buttons and continue to press all three buttons for five seconds to set the setpoint high limit maximum to this value.

NOTE: You must press all three buttons at exactly the same time for this action to occur.

IMPORTANT

1.This action sets the maximum setpoint value of all outputs to the setpoint high limit maximum.

2.Setting the high limit setpoint maximum is irre- versible. If you perform the action inadvertently and this setpoint adversely affects the control of your system, you must replace the controller.

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Honeywell AC-140-7, AC-220-7 manual Programming, Setpoint High Limit, Heating Mode Setpoint and Differential
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AC-220-7, AC-140-7 specifications

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