Trane Horizon OANG Series - Startup Verification Procedures; Indoor Fan Failure Switch Verification

Startup Form
OAU-SVX006E-EN 89
Voltages

Verify Indoor Fan Failure Switch (OAB, or OAG
cabinets with UC600 controls)
1. Note the minimum of Analog Values labelled
Supp
ly 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) unti
l the Supply Fan Air
Flow Active (AV41) matches the value from step
1.
3. Locate the Indoor Fan Failu
r
e Switch (IFFS) in the
control section.
a. Labelled IFFS or two re
d
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 sh
ou
ld then be lit.
6. Release Supply Fan Speed Command
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 m
ini
mum air flow:
a. For OAD, OAK or OAN with UC600, override
Supply Fan Speed Comm
and 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 wi
res labelled IFFS/
464A.
3. Slowly rotate IFFS switch clockwise (lightly
tapping the IF
FS after eac
h full turn) until IFFR
relay is not lit.
4. Rotate IFFS switch ½ turn counterclockwise. IFFR
rela
y should then be lit.
5. Release Supply Fan Speed Com
m
and override.