CG-SVX17D-EN 87
Installation - Electrical
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:
• 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.
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"
Figure 59. Wiring Examples for ECLS and EDLS
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