Cooling Setpoint Calculation with Humidity Switch

If the setpoint shift with humidity shift SYS-02=1 is configured, the setpoint will start with the outdoor temperature compensated value as described in Outdoor Temperature Compensated Cooling Setpoint.

If the humidity in the reference room gets too high, the humidity switch will open and the cooling setpoint will be increased with the parameter DEWP-03 setting. If the humidity switch is still open after the time defined with parameter DEWP-04, the setpoint will be increased again step by step until 50 °C + the “actual outdoor temperature compensated value”. If the humidity switch state is normal (closed), the setpoint will be ramped down with a time constant defined with parameter DEWP-05 until the “actual outdoor temperature compensated value” is reached. During this time, the setpoint will decrease with the same amount as defined with the DEWP-03 setting.


Fig. 4.   Cooling Setpoint Calculation with Humidity Switch

Table 5.   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-03: setpoint step

0 ... 20

2

K

DEWP-04: setpoint step interval

1 ... 120

5

min

DEWP-05: set point down-ramp

20 ... 600

60

min