Trane Tracer ZN.520 Manual page 79

Table 41 Coil temperature definition table
Cooling source Heating source
None None
Hydronic (changeover)
Hydronic, dedicated coil heating
Steam
Compressor
Electric
Hydronic (changeover)+ dedicated hydronic
Hydronic (changeover)+ electric
Hydronic, main None
coil changeover
Hydronic, main coil changeover
Dedicated hydronic
Steam
Compressor
Electric
Hydronic coil changeover + auxiliary coil
heating
Hydronic (changeover)+ electric
Hydronic, main None
coil cooling
Hydronic (changeover)
Hydronic, dedicated coil heating
Steam
Compressor
Electric
Hydronic (changeover)+ dedicated hydronic
Hydronic (changeover)+ electric
DX None
Hydronic (changeover)
Dedicated hydronic
Steam
Compressor
Electric
Hydronic (changeover)+ dedicated hydronic
Hydronic (changeover)+ electric
Note 1: Table 42 on page 78 identifies the logic for determining the main coil temperature for main coil changeover applications.
CNT-SVX04A-EN
Configuration
Main coil
Hot
Hot
NA
(Note 1)
(Note 1)
(Note 1)
Cold
Cold
Cold
Cold
NA
NA
NA
Auxiliary coil Description
NA 2-pipe heat only
NA 2-pipe steam heat only
NA Electric heat only
(Force Flo)
NA 2-pipe changeover
Hot 4-pipe changeover
NA 2-pipe changeover w/ electric heat
NA 2-pipe cooling only
Hot 4-pipe
Hot 4-pipe (steam heat)
NA 2-pipe cool only w/ electric heat
Hot DX unit vent w/ hot water heat
Hot DX unit vent w/ hot water heat
NA DX unit vent w/ electric heat
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