Table of Contents
Advertisement
46
Desert Aire - QS/QV Manual
Figure 22 - QV (20-30) ton showing location of Air Balance Ports
Procedure for QV 20 – 30 ton systems:
1.
Check the condition of the air filters to assure that they are clean.
2.
Check for any obvious restrictions in the ductwork.
3.
Start the supply air blower.
4.
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.
5.
Use a magnehelic or inclined manometer to measure the air pressure drop
across the reheat coil. See Figure 22. Note: Port #1 is measuring the
internal cabinet pressure downstream of the fan (high side) and port #2 is
added in the discharge duct in the field, downstream of the reheat coil
(low side).
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.
Discharge Duct
Hide quick links:
Advertisement
Table of Contents
