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Trane Tracer ZN.520

Trane Tracer ZN.520
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CNT-SVX04A-EN
Configuration
78
Table 42 Determining the main coil temperature for main coil changeover applications
Local entering water temperature
present
Communicated entering water
temperature present
Result
No No Unit is only permitted to only deliver heat.
Water assumed hot.
Control algorithm cooling capacity
remains at 0%.
No Yes The controller always uses the
communicated water temperature to
determine whether the unit can heat or
cool as required.
Entering water temperature sampling not
allowed.
Yes No The controller always uses the local
hardwired entering water temperature to
determine whether the unit can heat or
cool as required.
Entering water temperature sampling (if
enabled) is invoked as required.
Yes Yes The controller always uses the
communicated water temperature instead
of the local value, to determine whether the
unit can heat or cool as required.
Entering water temperature sampling not
allowed.

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