Part Two
54
Programming Example
The laboratory shown is Figure 7 is being initially setup. The required HVAC information is
below the figure.
Figure 7: Laboratory Setup Example
Laboratory design:
Laboratory size
= 18’ x 30’ x 10’ (5,400 ft
3
).
5 foot fume hood (4)
= 250 CFM min* 1,000 CFM max*
Flow offset
= 300–1000 CFM*
Ventilation set point
= 900 CFM* (ACPH = 10)
Supply Cooling Volume = 1,200 CFM*
Pressure differential
= -0.001 “ H
2
O*
Temperature set point
= 72
°
F
* Value supplied by laboratory designer.
Room Pressure Control System:
(1)
Model 8682 Adaptive Offset Control System mounted in the laboratory.
(2)
A through-the-wall pressure sensor mounted between the corridor (referenced
space) and laboratory (controlled space).
(3)
Damper, pressure dependent VAV box or valve with actuator assembly mounted
in supply air duct(s).
(4)
Damper, pressure dependent VAV box or valve with actuator assembly mounted
in exhaust air duct.
(5)
Flow station mounted in supply air duct. (Required for non-venturi valve
applications only.)
(6)
Flow station mounted in general exhaust air duct. (Required for non-venturi
valve applications only.)
(7)
Flow stations mounted in fume hood exhaust duct. (Required for non-venturi
valve applications only.)
