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14
EXTERNAL FILTER MAINTENANCE
Aluminum mesh 2 in. filters are located in the
supply weatherhood (if the weatherhood option
was purchased). Filters should be checked and
cleaned on a regular basis for best efficiency. The
frequency of cleaning depends upon the
cleanliness of the incoming air.
To remove these filters, remove bottom bolt in the
access door on the side of the weatherhood. Slide
the access door up and then pull out. Then, slide
the filters out (see FIGURE 19).
Clean filters by rinsing with a mild detergent in
warm water. After the filters are dry, an adhesive
spray available at most filter distributors may be
applied to increase filter efficiency.
INTERNAL FILTER MAINTENANCE
Opening the access doors labeled as “Filter
Access” provides access to the pleated 30%
filters (if the filter option was purchased). These
filters should be checked regularly, cleaned or
replaced as needed. See TABLE 7 for pleated filter
size and quantity for each unit.
FIGURE 19
Internal
Model
Filter Size
Quantity
ERH-20 20 x 20 2
ERH-45 20 x 25 3
ERH-55 16 x 25 6
ERH-90 20 x 20 8
VIBRATION
Excessive vibration maybe experienced during initial start-up. Left unchecked, excessive vibration can cause a
multitude of problems, including structural and/or component failure. The most common sources of vibration
are listed below.
Many of these conditions can be discovered by careful observation.
Refer to the troubleshooting section of this manual for corrective actions.
If observation cannot locate the source of vibration, a qualified
technician using vibration analysis equipment should be consulted. If the
problem is wheel unbalance, in-place balancing can be done providing
there is access to the fan wheel.
Generally, fan vibration and noise are transmitted to other parts of the
building by the ductwork. To eliminate this undesirable effect, the use of
heavy canvas connectors is recommended.
1. Wheel Unbalance
2. Drive Pulley Misalignment
3. Incorrect Belt Tension
4. Bearing Misalignment
5. Mechanical Looseness
6. Faulty Belts
7. Drive Component Unbalance
8. Poor Inlet/Outlet Conditions
9. Foundation Stiffness
TABLE 7