Titus UnderFloor Products IOM - Manual (Page 6)

6 Installation Manual - Underfloor Products
Underfloor Products IOM
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Motor is equipped with permanently lubricated bearings. Inspect fan and
motor assembly for accumulation of dust and dirt as required by operat-
ing environment. Clean as necessary.
If fan motor does not run:
a. Free rotation of blower wheel fan packing removed. freight or
installation damage.
b. Check for proper unit power Disconnects should be ON .Check
optional fusing.
c. Check for proper control signal, P/E switch setting, proper air control
24 vac at fan contactor, coil energized.
If fan motor runs, excessive noise:
a. Clearance problems on blower. All components securely attached.
b. Verify integrity of ductwork. Leaks or loose connections. Rattling
diffusers or balancing dampers.
c. Maximum CFM too high, or discharge static pressure too low
If fan motor runs, insufficient airflow:
a. Check for ductwork restrictions. Dirty air filters. Clogged water coils.
b. Re-adjust fan speed control.
c. Discharge static pressure too high.
If repair or replacement is required:
Motor and fan should be removed as an assembly. Disconnect all power
before servicing. Remove the four hex nuts from the mounting lugs hold-
ing the fan assembly to the discharge panel, and lower the assembly. Do
not allow assembly to hang from wiring.
If removing motor from blower, first loosen the set screw holding the
blower wheel to the motor shaft. Remove the three screws holding motor
to the fan housing, and slide motor and fan housing apart.
Reverse the procedure for assembly.
Note: Over tightening motor mounting screws may crush isolation bush-
ings, causing excessive fan noise.
Maintenance Procedures, Fan and Motor