Cooling Setpoint Calculation Dewpoint + Parallel Shift

With the temperature, humidity and ambient pressure, the controller calculates the dew point of the reference room. The dew point will be displayed at the output “DewPoint”. The cooling setpoint will be the dew point plus a parallel shift defined by the setting DEWP-01 parallel shift.

cooling setpoint = dew point + parallel shift (DEWP-01)

Table 6.   Pre-Control Heating Parameter List

Description

Value Range

Default Value

Unit

SYS-02: cooling control

0 = OTC setpoint control

1 = OTC setpoint with humidity shift

2 = dewpoint in RefRoom with parallel shift

0 ... 2

0

-

DEWP-01: dew point offset

0 ... 20

2

K

DEWP-02: ambient air pressure

1100 ... 800

1013

Pa


The ambient pressure depends significantly from the altitude of the location. As a typical relation, the following values can be used:

Table 7.   Ambient pressure / altitude

Altitude [msl]

Pressure [mbar]

0

1013

1000

900

2000

800