The module provides three internal calculation methods which can be selected by parameter SYS-04. Besides the three internal calculation methods, custom programming logic can be used and connected to the input “Req_Load“. In case the input “Req_Load“ is not connected (set to value 999), the internal calculation defined by parameter SYS-04 becomes active. See next table for an overview of the calculation methods.
Table 1. Calculation method
SYS-04 |
Calculation method |
0 |
Chilled water system return temperature control |
1 |
Chilled water system supply and return temperature control |
2 |
Chiller capacity control |
In case the input “Req_Load“ is connected to custom programming logic, the input behaviour can be defined by parameter SYS-05. See next table for an overview of the “Req_Load“ input signals.
Table 2. Input Req_Load
SYS-05 |
Input Req_Load |
0 |
Absolute value 0…N |
1 |
Floating value –1; 0,+1 |
2 |
Modulating control signal 0…100 |
Table 3. Parameter List
Description |
Value Range |
Default Value |
Unit |
SYS-04: calculation method: 0 = SRT only 1 = SST/SRT 2 = chiller capacity |
0…2 |
0 |
- |
SYS-05: Req_Loads input 0 = absolute 0…N 1 = floating –1; 0,+1 2 = percent 0…100 |
0…2 |
0 |
- |