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Installation Manual – THH
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THH HIGH PERFORMANCE HORIZONTAL
FAN COIL UNITS
FAN ASSEMBLY
Each fan assembly is easily removed from the unit at four ¼” weld studs
in the fan deck. In most applications the fan assembly can be removed
without disconnecting the duct work for service access to motors and
blowers at, or away from the unit.
Should the assembly require more extensive service,the motor/blower
assembly may be removed from the unit to facilitate such operations as
motor or blower wheel/housing replacement, etc. Dirt and dust should
not be allowed to accumulate on the blower wheel or housing. This can
result in an unbalanced blower wheel condition that can damage a blower
wheel or motor. The wheel and housing may be cleaned periodically using
a vacuum cleaner and a brush taking care not to dislodge the factory
balancing weights on the blower wheel blades.
To remove the motor from the fan, disconnect the motor wire leads, loosen
the set screw on the motor shaft and remove the (3) cap screws that
attached the motor to the blower housing. To reassemble, insert the motor
into the blower wheel, (motor slots to be facing up) center the blower
wheel within the blower housing and tighten the set screw. Reinstall the
(3) cap screws and tighten to 40 in/lbs. Place the entire fan assembly back
up over the weld studs, install the washers and tighten the 1/4-20 nylok
nuts to 65 in/lbs.
COIL
Coils may be cleaned in place by removing the motor/blower assemblies
and brushing the entering air face between fins with a soft brush parallel
to fins.
Do not brush perpendicular to fin orientation as damage may occur.
Brushing should be followed by cleaning with a vacuum cleaner. If a
compressed air source is available, the coil may also be cleaned by blowing
air through the coil fins from the leaving air face. Vacuuming should again
follow this. Units provided with the proper type of air filters, replaced
regularly, may require periodic coil cleaning.
Section 3 – Normal Operation & Periodic Maintenance
Fan Assembly Removal
Electric Heater Removal
