Enthalpy Wheel
No cleaning of the enthalpy wheel is required as it is
self-cleaning due to the opposing airflows. If it is desired
to clean the enthalpy wheel, use low pressure air or a
vacuum. Wash the cassette panels with a soft cloth and
mild cleaning solution. Visually inspect the cassette brush
seals (shown in Figure 8), perimeter seal and drive belt for
proper operation.
Cassette Removal
After disconnecting the power from the unit, open the ser-
vice door for the cassette access. Disconnect the service
connector between the motor and the control box. Re-
move the exhaust filters and slide the cassette out of the
unit. Take care to not damage the rotor face or any of the
cassette seals. Proper support must be provided so the
cassette is not dropped.
Perimeter Seal Replacement
To replace the perimeter seal, the enthalpy wheel must
be removed from the frame. Disconnect the service con-
nector to the drive motor of the enthalpy wheel cassette.
Remove the cassette from the unit and stand the assem-
bly on the floor or roof. Remove the dust cap (#1, Figure
9) from the bearing on the drive motor side of the cas-
sette. Remove the bolt (#2, Figure 9) from the end of the
wheel shaft with a socket or wrench on the drive motor
side. Repeat this procedure for the other side of the cas-
sette assembly. Remove the four bolts (#3, Figure 9) with
a socket or wrench. Remove the beam and bearing as-
sembly from the end of the wheel shaft. Loosen the four
Nyloc nuts (#1, Figure 10) holding the drive motor using
a socket or wrench. Rotate the drive motor in the slots to
loosen the drive belt and remove the belt. Lift the enthalpy
wheel out of the frame with assistance and set aside.
Remove the perimeter seal halves (#4, Figure 9) from the
cassette frame assembly. Install the two new perimeter
seal halves by pressing them into place, cutting to the
correct length as is necessary. The perimeter seals are
non-adjustable. Complete the installation by reversing the
above procedure.
WARNING
Disconnect the main power switch to the unit before per-
forming service and maintenance procedures.
CAUTION
When handling the enthalpy wheel, ensure not to dam-
age the face of the wheel.
Rotor
Brush seal
Figure 8: Enthalpy wheel brush seals
Figure 9: Cassette and drive
Figure 10: Drive motor Nyloc nuts
VCES-VHC-IOM-1F – VHC-36, -42 & -50
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