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Procedure for QV 4 – 15 ton systems:
1.
2.
3.
4.
5.
6.
Always measure the current draw of the blower motor after you make any changes to
the airflow quantity. If the motor draws more than its FLA rating but the total airflow is
still low, check the resistance of the ductwork. Verify that all grilles and dampers have
been opened and that there are no sudden turns or restrictions in the ductwork.
Figure 21 - QV (4-15) ton showing location of Air Balance Ports
Check the condition of the air filters to assure that they are clean.
Check for any obvious restrictions in the ductwork.
Start the supply air blower.
Drive the outdoor air damper open, start the supply air blower, and energize
the field-installed exhaust air blower by turning on the "occupied" switch.
Use a magnehelic or inclined manometer to measure the air pressure drop
across the evaporator and reheat coil (ports #1 and #2). Note: Ensure test
is performed with refrigeration off and evaporator coil dry. See Figure 21.
Compare this value to the value printed on the airflow label on the side of the
dehumidifier.
Change the airflow, if necessary, by adjusting the motor pulley or any
balancing dampers in the field-installed ductwork.
Desert Aire - QS/QV Manual
45
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