Data Aire dap4 touch, Инструкция по установке, эксплуатации и обслуживанию

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86 • dap4 User Manual
c) High Relative humidity Limit in dewpoint control
• If high relative humidity condition occurs while humidity control mode is set to
Dewpoint control then dewpoint control has priority over the relative humidity control.
• If high dewpoint setpoint satisfies but relative humidity rises to relative humidity
setpoint, the dehumidification control will be as follows:
i) Single Variable speed compressor system
Dehumidification cycles on:
If unit is not in cooling mode, the variable speed compressor turns on when humidity is at
Humidity Setpoint (HSP) -1%.Compressor will modulate from 0% to 100%, 10% speed for
every 0.1%RH. Compressor will run at 100% when humidity equals humidity setpoint.
Dehumidification cycles off:
Variable speed compressor C1 starts to ramp down in 10 % decrement when Humidity
drops to Humdity Setpoint –humidity deadband. Compressor will run at minimum speed
(0 VDC) when humidity equals humidity setpoint – humidity deadband- 1%.Compressor
turns off when Humidity = Humidity Setpoint – humidity deadband- 1.5 % and minimum
runtime expired.
ii) Dual circuit with a variable speed compressor and a fixed speed compressor
Dehumidification cycles on:
If unit is not in cooling mode, C2 fixed speed compressor turns on when humidity reaches
Humidity Setpoint (HSP). Compressor will not violate the compressor short cycle regulation.
Dehumidification cycles off:
Compressor C2 turns off when humidity = humidity setpoint- humidity deadband.
Safeties and Alarms for System with Electronic Expansion Valve (EEV)
i High suction temperature alarm.
The variable speed compressor’s suction temperature can be viewed on dap4.
Compressors’ high suction temperature alarm limits is default to 85oF (the range is 80-
95°F) and a suction temperature deadband is default to 5 oF(1-5°F).
a. When C1 has been running for 3 minutes and suction temperature is higher than the
alarm setpoint, C1 high suction temperature alarm will activate.
b. C1 compressor will shut down during high suction temperature alarm. Alarm will
automatically reset if suction temperature falls below the high suction temperature
alarm limit minus the deadband and the variable speed compressor resumes
operation if high suction temperature alarm has been cleared for 5 minutes.
c. An alarm message on dap4 display will notify the end-user that compressors
lock-out are delayed by high suction temperature alarm time-out during this 5
minutes time-out.