Chilled Water System Supply and Return Temperature Control (SYS-04 = 1)

This function requires a chilled water system supply and return temperature sensor.

The calculated number of stages is incremented by one when the system supply temperature is higher than the chilled water supply temperature setpoint defined by the input “SysSupplyTempSp“.

The calculated number of stages is decremented by one when the system supply temperature is lower than the chilled water supply temperature setpoint, and the system return temperature is lower than the chilled water return temperature setpoint defined by the datapoint “SysRetTempSp“.

Table 5.    Parameter List

Description

Value Range

Default Value

Unit

SYS-04: calculation method;

0 = SRT only

1 = SST/ SRT

2 = chiller capacity

0…2

0

-

SRT-01: P-band SRT control

0…1000

4

K

SRT-02: I-time SRT Control; 0 = disable

0…3600

0

sec