CGWF-SVX01A-EN 37
Installation Mechanical
Water Treatment
Using untreated or improperly treated water in these units may result in inefficient
operation and possible tube damage. Consult a qualified water treatment specialist to
determine whether treatment is needed.
CAUTION
Proper Water Treatment!
The use of untreated or improperly treated water in a Chiller may result
in scaling, erosion, corrosion, algae or slime. It is recommended that the
services of a qualified water treatment specialist be engaged to
determine what water treatment, if any, is required. Trane assume no
responsibility for equipment failures which result from untreated or
improperly treated water, or saline or brackish water.
Water pressure Relief Valves
Install a water pressure relief valve in the condenser and evaporator leaving chilled
water piping (Figure 15). Water vessels with close-coupled shutoff valves have a high
potential for hydrostatic pressure buildup on a water temperature increase. Refer to
applicable codes for relief valve installation guidelines.
CAUTION
Install Water Relief Valves!
To prevent shell damage, install pressure relief valves in both evaporator
and condenser water systems.
Low Temperature Operation
The leaving water temperature cutout setpoint is adjusted using the DynaView or
TechView. There is a minimum differential that must exist between the Chilled Water
Setpoint (CWSP) and the Leaving Water Temperature Cutout setpoint (LWTCS). This
minimum varies depending on the design DT, the number of cooling stages and
whether or not Hot Gas Bypass (HGBP) is installed. The equations to calculate
LWTCS are shown below.
Leaving Water Temperature Cutout Setpoint (LWTCS) is:
20-30 T for units with out HGBP
20-30 T for units with HGBP
40-60 T for units with out HGBP
CWSP
∆T
2
-------2°F+
– LWTCS=
CWSP
∆T
2
-------4°F+
– LWTCS=
CWSP
∆T
4
-------2°F+
– LWTCS=
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