Verify Indoor Fan Failure Switch (OAB, or OAG
cabinets with UC600 controls)
1. Note the minimum of Analog Values labelled
Supply Fan Air Flow Minimum Setpoint –
Cooling Mode (AV59) and Supply Fan Air Flow
Minimum Setpoint – Heating Mode (AV13).
2. Override Analog Output labelled Supply Fan
Speed Command (AO2) until the Supply Fan Air
Flow Active (AV41) matches the value from step
1.
3. Locate the Indoor Fan Failure Switch (IFFS) in the
control section.
a. Labelled IFFS or two red wires labelled IFFS/
464A.
4. Slowly rotate IFFS switch clockwise (lightly
tapping the IFFS after each full turn) until IFFR
relay is not lit.
5. Rotate IFFS switch ½ turn counterclockwise. IFFR
relay should then be lit.
6. Release Supply Fan Speed Command
Startup Form
OAU-SVX01K-EN
97
Voltages
Rated Voltage
Measured
Voltage L1-L2
Voltage L1-L3
Voltage L2-L3
Voltage L1-G
Voltage L2-G
Voltage L3-G
TNS2 Secondary Voltage
Verify Indoor Fan Failure Switch (OAD, OAK or OAN
cabinets with UC600 controls and all units without
UC600)
1. Set the unit at minimum air flow:
a. For OAD, OAK or OAN with UC600, override
Supply Fan Speed Command to 0%.
b. For all Units without UC600, have the controls
contractor set the supply fan speed so that the
air flow is at minimum.
2. Locate the Indoor Fan Failure Switch (IFFS) in the
control section.
a. Labelled IFFS or two red wires labelled IFFS/
464A.
3. Slowly rotate IFFS switch clockwise (lightly
tapping the IFFS after each full turn) until IFFR
relay is not lit.
4. Rotate IFFS switch ½ turn counterclockwise. IFFR
relay should then be lit.
5. Release Supply Fan Speed Command override.
