Carrier 48/50PD05 Service Test, Programming Operating Schedules, Independent Outputs, Fan Test

48/50PD

Programming Operating Schedules

The ComfortLinkt controls will accommodate up to eight different schedules (Periods 1 through 8), and each schedule is assigned to the desired days of the week. Each schedule includes an occupied on and off time. As an example, to set an occupied schedule for 8 AM to 5 PM for Monday through Friday, the user would set days Monday through Friday to ON for Period 1. Then the user would configure the Period 1 Occupied From point to 08:00 and the Period 1 Occupied To point to 17:00. To create a different weekend schedule, the user would use Period 2 and set days Saturday and Sunday to ON with the desired Occupied On and Off times.

IMPORTANT: By default, the time schedule periods are programmed for 24 hours of occupied operation.

To create a schedule, perform the following procedure:

1.Scroll to the Configuration mode, and select CCN CONFIGURATION (CCN). Scroll down to the Schedule Number (Configuration→CCN→SCH.O=SCH.N). If password protection has been enabled, the user will be prompted to enter the password before any new data is accepted. SCH.N has a range of 0 to 99. The default value is 1. A value of 0 is always occupied, and the unit will control to its occupied set points. A value of 1 means the unit will follow a local schedule, and a value of 65 to 99 means it will follow a CCN schedule. Schedules 2-64 are not used as the control only supports one internal/local schedule. If one of the 2-64 schedules is configured, then the control will force the number back to 1. Make sure the value is set to 1 to use a local schedule.

2.Enter the Time Clock mode. Scroll down to the LOCAL TIME SCHEDULE (SCH.L) sub-mode, and press ENTER. Period 1 (PER.1) will be displayed.

3.Scroll down to the MON.1 point. This point indicates if schedule 1 applies to Monday. Use the ENTER command to go into Edit mode, and use the Up or Down key to change the display to YES or NO. Scroll down through the rest of the days and apply schedule 1 where desired. The schedule can also be applied to a holiday.

4.Configure the beginning of the occupied time period for Period 1 (OCC). Press ENTER to go into Edit mode, and the first two digits of the 00.00 will start flashing. Use the Up or Down key to display the correct value for hours, in 24-hour (military) time. Press ENTER and hour value is saved and the minutes digits will start flashing. Use the same procedure to display and save the desired minutes value.

5.Configure the unoccupied time for period 1 (UNC). Press ENTER to go into Edit mode, and the first two digits of the 00.00 will start flashing. Use the Up or Down key to display the correct value for hours, in 24-hour (military) time. Press ENTER and hour value is saved and the minutes digits will start flashing. Use the same procedure to display and save the desired minutes value.

6.The first schedule is now complete. If a second schedule is needed, such as for weekends or holidays, scroll down and repeat the entire procedure for period 2 (PER.2). If additional schedules are needed, repeat the process for as many as are needed. Eight schedules are provided. See Table 4 for an example of setting the schedule.

SERVICE TEST

The Service Test function can be used to verify proper operation of compressors, heating stages, indoor fan, outdoor fans, power exhaust fans, economizer, crankcase heaters, and the alarm relay. Use of Service Test is recommended at initial system start up and during troubleshooting (See Table 5 for point details).

Service Test mode has the following changes from normal operation:

SOutdoor air temperature limits for cooling circuits, economizer,

and heating are ignored. Normal compressor time guards and other staging delays are reduced to 30 seconds or less.

SCircuit alerts are limited to 1 strike (versus 3) before changing to alarm shut down state.

SThe status of ALM.N is ignored so all alerts and alarms are broadcast on CCN.

SThe words “SERVICE TEST” are inserted into every alarm message.

Service test can only be turned ON/OFF at the unit display. Once turned ON, other entries may be made with the display or through CCN. To turn Service Test on, change the value of TEST to ON. To turn service test off, change the value of TEST to OFF.

IMPORTANT: Service Test mode may be password protected. Refer to Basic Control Usage section for more information. Depending on the unit model, factory-installed options, and field-installed accessories, some of the Service Test functions may not apply.

Independent Outputs

The independent (INDP) submenu is used to change output status for the economizer, power exhaust stages, crankcase heaters, and the alarm relay. These independent outputs can operate simultaneously with other Service Test modes. All outputs return to normal operation when Service Test is turned off. When the economizer is using the factory default Digital Control Type (Configuration→ECON→E.CTL is 1 or 2) then the Economizer Calibration feature may be used to automatically check and reset the economizer actuator range of motion. Refer to the economizer operation section of more details.

IMPORTANT: If a network force is applied to CCN points: ECONOCMD, PE_1, PE_2, or ALMOUT, their respective test mode functions will not be usable. Those forces are at a higher level than test mode; therefore they will still be honored when in test mode.

Fan Test

The fans (FANS) submenu is used to change output status for the indoor fan and outdoor fan stages. The VFD power can be turned on and off via IDF (Supply VFD Power Test). The indoor fan speed test (F.SPD) runs the fan at the desired speed entered. The outdoor fan relay test (OFC.1) only tests the relay for switching between high and low speeds. The actual outdoor fan will not run unless cool test is on. The cooling (COOL) and heating (HEAT) service test outputs are reset to OFF for the fans service test.

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