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Airflow Adjustments
Constant Volume Units
(Unit model number digit 15 = "1")
Adjust the motor sheave – close the sheave in for more fan RPM’s, open it for less.
2 Stage Airflow/Single Zone VAV (Symbio Cond Only)
(Unit Model Number Digit 15 = “D”)
Use the Symbio Phone App Settings, Indoor, Supply Fan Maximum Speed Setpoint and Supply Fan
Minimum Speed Setpoint
2 Stage Airflow (Electromechanical Cond Only)
(Unit Model Number Digit 15 = “C”)
For 2-Speed VFD controlled units the desired maximum air flow (High Speed) is set by reprogramming
parameter 6-15 on the VFD to the frequency value that best meets the RPM requirement as shown in
the catalog fan tables.
TR-150 Procedure
The Main Menu accesses all parameters.
1. Press the [Menu] key twice until indicator in display is placed above “Main Menu”.
2. Press [▼] to 6-** Analog In/Out
3. Press [Ok]
4. Press [▼] to 6-1* Analog Input 53
5. Press [Ok]
6. Press [▼] to 6-15 Terminal 53 High Ref. / Feedback Value
7.Press [Ok]
8. Press [▲] [▼] to set/change.
9.Press [Ok] to save changes.
10.Press [Back] until you get to the main screen.
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