Carrier 48TC*D08 START-UP,PREMIERLINKt CONTROLS, Start-Up, Rtu-Mpcontrol, Field Service Test

NOTE: The default value for the evaporator-fan motor on/off delay is 45 seconds. The Integrated Gas Unit Controller (IGC) modifies this value when abnormal limit switch cycles occur. Based upon unit operating conditions, the on delay can be reduced to 0 seconds and the off delay can be extended to 180 seconds.

If the limit switch trips at the start of the heating cycle during the evaporator on delay, the time period of the on delay for the next cycle will be 5 seconds less than the time at which the switch tripped. (Example: If the limit switch trips at 30 seconds, the evaporator-fan on delay for the next cycle will occur at 25 seconds.) To prevent short-cycling, a 5-second reduction will only occur if a minimum of 10 minutes has elapsed since the last call for heating.

The evaporator-fan off delay can also be modified. Once the call for heating has ended, there is a 10-minute period during which the modification can occur. If the limit switch trips during this period, the evaporator-fan off delay will increase by 15 seconds. A maximum of 9 trips can occur, extending the evaporator-fan off delay to 180 seconds.

To restore the original default value, reset the power to the unit.

To shut off unit, set system selector switch at OFF position. Resetting heating selector lever below room temperature will temporarily shut unit off until space temperature falls below thermostat setting.

Ventilation (Continuous Fan)

Set fan and system selector switches at ON and OFF positions, respectively. Evaporator fan operates continuously to provide constant air circulation. When the evaporator-fan selector switch is turned to the OFF position, there is a 30-second delay before the fan turns off.

START-UP, PREMIERLINKt CONTROLS

Use the Carrier network communication software to start up and configure the PremierLink controller.

Changes can be made using the ComfortWORKSr software, ComfortVIEWt software, Network Service Tool, System Pilott device, or Touch Pilott device. The System Pilot and Touch Pilot are portable interface devices that allow the user to change system set-up and setpoints from a zone sensor or terminal control module. During start-up, the Carrier software can also be used to verify communication with PremierLink controller.

NOTE: All set-up and setpoint configurations are factory set and field-adjustable.

For specific operating instructions, refer to the literature provided with user interface software.

Perform System Check-Out

1.Check correctness and tightness of all power and communication connections.

2.At the unit, check fan and system controls for proper operation.

3.At the unit, check electrical system and connections of any optional electric reheat coil.

4.Check to be sure the area around the unit is clear of construction dirt and debris.

5.Check that final filters are installed in the unit. Dust and debris can adversely affect system operation.

6.Verify that the PremierLink controls are properly connected to the CCN bus.

Initial Operation and Test

Perform the following procedure:

1.Apply 24 vac power to the control.

2.Connect the service tool to the phone jack service port of the controller.

3.Using the Service Tool, upload the controller from address 0, 31 at 9600 baud rate. The address may be set at this time. Make sure that Service Tool is connected to only one unit when changing the address.

Memory Reset

DIP switch 4 causes an E-squared memory reset to factory defaults after the switch has been moved from position 0 to position 1 and the power has been restored. To enable the feature again, the switch must be put back to the 0 position and power must be restored; this prevents subsequent resets to factory defaults if the switch is left at position 1.

To cause a reset of the non-volatile memory (to factory defaults), turn the controller power off if it is on, move the switch from position 1 to position 0, and then apply power to the controller for a minimum of 5 seconds. At this point, no action occurs, but the controller is now ready for the memory to reset. Remove power to the controller again and move the switch from position 0 to position 1. This time, when power is applied, the memory will reset to factory defaults. The controller address will return to bus 0 element 31, indicating that memory reset occurred.

Refer to Rooftop PremierLink Installation, Start-Up, and Configuration Instructions (Form 33CS-58SI) for full discussion on configuring the PremierLink control system.

START-UP, RTU-MP CONTROL

Field Service Test, explained below, will assist in proper start-up. Configuration of unit parameters, scheduling options, and operation are also discussed in this section.

Field Service Test

The Field Service Test function can be used to verify proper operation of compressors, heating stages, indoor fan, power exhaust fans, economizer, and dehumidification. Use of Field Service Test is recommended at initial system start up and during troubleshooting. See RTU-MP Controls, Start-Up, Operation, and Troubleshooting Instructions (Form 48-50H-T-2T), Appendix A for Field Service Test Mode table.

48TC

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