Chilled Water Reset (Cwr) - Trane CGAM Installation & Operation Manual

Chilled Water Reset (CWR)

CH530 resets the chilled water temperature set point based on either return water temperature, or
outdoor air temperature.
The following shall be selectable:
•
•
•
•
•
The equations for each type of reset are as follows:
Return
CWS' = CWS + RATIO (START RESET - (TWE - TWL))
and CWS' > or = CWS
and CWS' - CWS < or = Maximum Reset
Outdoor
CWS' = CWS + RATIO * (START RESET - TOD)
and CWS' > or = CWS
and CWS' - CWS < or = Maximum Reset
where
CWS' is the new chilled water set point or the "reset CWS"
CG-SVX17D-EN
Figure 59. Wiring Examples for ECLS and EDLS
One of three Reset Types: None, Return Water Temperature Reset, Outdoor Air Temperature
Reset, or Constant Return Water Temperature Reset.
Reset Ratio Set Points.
For outdoor air temperature reset there shall be both positive and negative reset ratio's.
Start Reset Set Points.
Maximum Reset Set Points.
Installation - Electrical
87