47 • Mini dap4 User Manual
DEWPOINT CONTROL LOGIC
Menu Settings and Display for Dewpoint mode
1. If humidier control mode is set to Dewpoint control, Mini-dap4 will shows the additional setpoints:
Menu B - Setpoints
- High Dewpoint setpoint (Range 50 to 65) - default 59°F
- High Dewpoint Deadband (Range 1.0 to 3.0) - default 1°F
- Low Dewpoint setpoint (Range 40 to 55) - default 45°F
- Low Dewpoint Deadband (Range 1.0 to 3.0) - default 1°F
The high and low dewpoint setpoint cannot overlap.
DX Dehumidication in dewpoint mode
In DX mode, 2-cooling stages on as follows:
Cooling 1 on when dewpoint = High Dewpoint Setpoint - 0.2°F OR Humidity Setpoint - 1%
Cooling 2 on when dewpoint = High Dewpoint Setpoint - 0.0°F OR Humidity Setpoint - 0%
In DX mode, 2-cooling stages off as follows:
Cooling 2 off when dewpoint = High Dewpoint Setpoint - High Dewpoint DB - 0.0°F AND
Humidity Setpoint - Humidity Deadband - 0%
Cooling 1 off when dewpoint = High Dewpoint Setpoint - High Dewpoint DB - 0.2°F AND
Humidity Setpoint - Humidity Deadband - 1%
Chilled Water Dehumidication in dewpoint mode
Chilled Water valve opening
Chilled Water valve will open if dewpoint is increasing OR relative humidity is increasing closer to the set-
points. Either high dewpoint or high relative humidity can cause the CW to open and call for dehumidication.
The modulation of the CW valve will be based on whichever has higher demand for CW valve to open. For
example, if dewpoint requires the CW valve to open 20% and humidity requires the CW valve to open 50%, as
a result, CW valve will open 50%. Individual logic for CW valve opening based on dewpoint and humidity is as
followed:
CW valve modulation based on dewpoint
Dehumidication mode will start if return dewpoint rises to high_dewpoint_setpoint – 1.0°F; after that, CW
valve will:
Open 10% if return dewpoint = high_dewpoint_setpoint – 0.9°F
Open 20% if return dewpoint = high_dewpoint_setpoint – 0.8°F
Open 30% if return dewpoint = high_dewpoint_setpoint – 0.7°F
Open 40% if return dewpoint = high_dewpoint_setpoint – 0.6°F
Open 50% if return dewpoint = high_dewpoint_setpoint – 0.5°F
Open 60% if return dewpoint = high_dewpoint_setpoint – 0.4°F
Open 70% if return dewpoint = high_dewpoint_setpoint – 0.3°F
Open 80% if return dewpoint = high_dewpoint_setpoint – 0.2°F
Open 90% if return dewpoint = high_dewpoint_setpoint – 0.1°F
Open 100% if return dewpoint = high_dewpoint_setpoint
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