UNT-SVX07B-EN 97
Start-Up
• One DX cooling stage
• One or two-stage electric heat (dehumidification req
uires this to be in the reheat position)
• Face and bypass damper
• Modulating outdoor air damper
• One baseboard heat stage
For more information, see T
able 27.
Table 27. Binary output configuration
Binary Output Configuration
J1-1 Fan high
J1-2 Fan medium
J1-3 Fan low
J1-4 (Key)
J1-5 Cool valve—open, or 2-position valve
(a)
(a)For Tracer ZN520 units configured and applied as 2-pipe hydronic heat/cool changeover, terminals J1-5 and J1-6 are used
to control the primary valve for both heating and cooling. For Tracer ZN520 units configured and applied as 2-pipe hydronic
heat/cool changeover with electric heat, terminals J1-5 and J1-6 are used to control the primary valve (for both cooling
and heating), and terminals J1-9 and J1-10 are used only for the electric heat stage. For those 2-pipe changeover units,
electric heat will not be energized while the hydronic supply is hot (5° or more above the space temperature).
J1-6 Cool valve—close Note 1
J1-9 Heat valve—open, or 2 position valve, or 1st electric heat stage
(a)
J1-10 Heat valve—close or 2nd Electric heat stage
(a)
J1-11 Fresh air damper—open
J1-12 Fresh air damper—close
TB4-1 Generic/baseboard heat output
TB4-2 24 Vac
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