Example 3: Minimum Ventilation Adjustment - Honeywell Design and Application Technical Reference Manual

Section 1 - Ventilation

Example 3: Minimum Ventilation Adjustment

EXHAUST
AIR
OUTSIDE
AIR
30˚F (-1 C)
1. Specifications:
Office space - 100,000 ft
Air handler capacity 20,000 cfm
3
(566 m /min.)
People in area - 250
2. Ventilation (V ) required:
OT
= 250 x 5 cfm + 0.06 cfm/ft
= 1250 cfm + 6000 cfm
= 7250 cfm
Where V = 0.06 cfm/ft
at
Therefore V = 6000 cfm
at
Honeywell Economizers 63-8594-02
DAMPER
DAMPER
2
2 2
x 100,000 ft
2 2
x 100,000 ft .
16
RETURN
AIR
73˚F (23 C)
3. Ventilation percentage:
7250 cfm (205.3 m
3
(570 m /min)
V maximum position= 36%
OT
6000 cfm (169.9 m
3
(570 m /min)
V Minimum position= 30%
OT
4. Measure the return air temperature:
73°F (23°C).
5. Measure the outside air temperature:
30°F (-1°C).
This example shows a procedure for adjusting
the DCV maximum and minimum positions.
M23910
3
/min)/20,000 cfm
3
/min)/20,000 cfm