UNT Controller—Unitary Controller (UNT) 55
Table 22 lists the selections made through HVAC PRO for Windows for
the example in Figure 30. Johnson Controls recommends that packaged
rooftop applications have separate transformers for controller and loads.
Sharing of transformers for controller and loads for packaged rooftop
wiring is not recommended.
Table 22: Packaged Rooftop Parameters and Configuration
Selections
HVAC PRO for Windows Parameters Configuration Selections
Economizer Output Type
Zone Bus
Economizer Changeover Type
Dry Bulb
Heating Type
Two Stages
Cooling Type
Two Stages
Outdoor Air Lockout of Heating/Cooling
Yes
Zone Reset from Humidity
No
Heating/Cooling Diagnostics
Yes
Lighting Interface
No
Air Flow Interlock
Yes
prmech
7(
TE
3
6
TE
1
C
1
Exhaust Air
Outdoor Air
Return Air
Discharge Air
Airflow
Switch
'$
H
T
G
1
H
T
G
2
C
L
G
1
C
L
G
2
Figure 30: Packaged Rooftop Mechanical Flow Diagram
Packaged
Rooftop
Applications
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