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65•dap4UserManual

dap4 CONTROL LOGIC

SYSTEM START DELAY

After the self-test is complete, the Timed Start Delay will be displayed and will start counting down

fromtheprogrammeddelaytime.Thefactorysettingisve(5)seconds.Thesettingispro-

grammed in Menu A – ON/OFF. The range is from 1 to 600 seconds in 5 second increments.

BLOWER

Plug Fans – Units with plug fans have a “soft-start”. Upon completion of the Timed Start Delay, on

multiplefanunits,therstfanwillstart.Afterve(5)secondsthesecondfanwillstart.Thethird

and fourth fans (as applicable) will follow the same delay sequence.

Centrifugal Fans – The blower(s) will start upon completion of the Timed Start Delay and is pro-

grammed and wired to run continuously during unit operation.

FUNCTIONS

Cooling,reheat,humidicationanddehumidicationfunctionsareinhibitedforone(1)minuteafter

the blower(s) start. This allows the temperature and humidity sensors to adjust.

COMPRESSOR COOLING

1.Thereisave(5)minutedelaybetweenstart-to-startofthesameprimarystagecompressor.

 Thedelaywillbeincreasedtosix(6)minutesforone(1)hourfollowingthedetectionofa 

compressor short-cycle condition even if the compressor short cycle alarm is disabled (Menu K

- Alarms and Limits).

2. There is a two (2) minute delay between stop-to-start of the same primary stage compressor.

3. There is a one (1) minute delay between stop-to-start of the same secondary unloader stage

compressor or stop-to-start of a second secondary unloader stage compressor.

4. Compressor staging sequence at each adjustment period:

UNITS WITH STANDARD (DUAL) SCROLL COMPRESSORS

Compressor “ON” sequence (Increasing Temperature)

Cool 1 ON at Temperature Setpoint + Temperature Deadband

Cool 2 ON at Temperature Setpoint + Temperature Deadband + y°F

Compressor “OFF” sequence (Decreasing Temperature)

Cool 2 OFF at Temperature Setpoint + y°F

Cool 1 OFF at Temperature Setpoint

UNITS WITH OPTIONAL TANDEM SCROLL OR SEMI-HERMETIC COMPRESSORS

Compressor “ON” sequence (Increasing Temperature)

Cool 1 ON at Temperature Setpoint + Temperature Deadband

Cool 2 ON at Temperature Setpoint + Temperature Deadband + y°F

Cool 3 ON at Temperature Setpoint + Temperature Deadband + 2y°F

Cool 4 ON at Temperature Setpoint + Temperature Deadband + 3y°F

Data Aire dap 4 User Manual

Questions and Answers: