6 • dap4 User Manual
OPERATIONAL FEATURES
(Optional features may require additional components and/or sensors)
Sequential Load Activation:
Time and temperature based logic that sequentially starts and stops stages of cooling
and reheat
Compressor Short-Cycle Contro
l: Prevents excessive compressor wear by using restart and anti-cycle limits
Automatic or Manual Restart:
Restart methods are programmable in the event of a power failure
Supplemental Compressor Operation during Energy Saver Mode
: Extends the savings from Energy Saver by al-
lowing one or two compressors to supplement the cooling as needed when Energy Saver cooling is not sufficient
Humidity Anticipation:
Modifies the humidity setpoint to reduce excess humidification and dehumidification
Dehumidification Mode Lockout
: Inhibits dehumidification if not required for system performance
Start Time Delay:
Programmable time delay staggers the start-up of multiple units to prevent high power demand
peaks
Chilled Water, Energy Saver and Hot Water Coil Flush Cycle:
Periodically circulates fluid in the coil to reduce
deposit build-up in system
Automatic Compressor Rotation:
Periodically rotates the lead/lag compressor sequence to balance run times
Automatic Reheat Element Rotation:
Rotates the staging sequence to balance the heating elements run times
Energy Saver (Glycol) or Auxiliary Chilled Water Operation:
Two types of Energy Savers Systems are available
Programmable Water Under the Floor Alarm:
Programmable to activate alarm, stop compressor operation or com-
plete unit shut down
DIAGNOSTICS AND SERVICE FEATURES
Alarms Displayed in Order of Occurrence:
Sequence with time of occurrence assist in diagnosing the cause of
alarm(s)
Programmable Delays for Optional Alarms:
Reduces nuisance and false alarms caused by temporary or transient
conditions
Manual Diagnostics Program:
Provides accessible procedures to test the processor and major system components
External Manual Override for Blower, Cool 1, Cool 2, Humidification, Water Valve and Fan Speed Control:
The
control circuit is operable if the processor is not functioning properly
Adjustable Alarm Limits
: Threshold levels for temperature and humidity alarms are programmable
Four Programmable Alarms Contacts:
Four standard alarms contacts are programmable for remote monitoring
Audio Alarm Tone:
Three (3) programmable alarm tones are available
Alarm History:
100 alarms can be stored for system follow-up
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