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Typically the maximum ventilation rate will be about 5 to
10% more than the typical cfm required per person, using
normal outside air design criteria.
A proportional anticipatory strategy should be taken with
the following conditions: a zone with a large area, varied occu-
pancy, and equipment that cannot exceed the required ventila-
tion rate at design conditions. Exceeding the required ventila-
tion rate means the equipment can condition air at a maximum
CONTROL
CURVE
A
B
C
D
EXH
N1
Set
N
2V
10V
EXH
P1
P
Min
Pos
T1
Open
T
DCV
Max
2V
10V
AQ1
DCV
AQ
DCV
Set
SO+
2V
10V
SO
Free
SR+
Cool
B
C
SR
D
A
Fig. 42 — EconoMi$erIV Controller
CONTROL POINT
APPROX. °F (°C)
AT 50% RH
73 (23)
70 (21)
67 (19)
63 (17)
65
(18)
60
(16)
A
55
(13)
B
50
C
(10)
D
45
(7)
40
(4)
35
(2)
35
40
45
50
55
60
(2)
(4)
(7)
(10)
(13)
(16)
APPROXIMATE DRY BULB TEMPERATURE— °F (°C)
Fig. 41 — Enthalpy Changeover Set Points
TR
TR1
24
24 Vac
Vac
COM
HOT
_
+
1
2
5
4
3
EF
EF1
ventilation rate that is greater than the required ventilation rate
for maximum occupancy. A proportional-anticipatory strategy
will cause the fresh air supplied to increase as the room CO
level increases even though the CO
reached. By the time the CO
damper will be at maximum ventilation and should maintain
the set point.
85
90
95
100
(29)
(32)
(35)
(38)
80
(27)
75
(24)
70
(21)
A
B
C
D
65
70
75
80
85
90
95
(18)
(21)
(24)
(27)
(29)
(32)
(35)
(38)
CO SENSOR MAX RANGE SETTING
6000
5000
4000
3000
2000
1000
0
2
DAMPER VOLTAGE FOR MAX VENTILATION RATE
Fig. 43 — CO
29
set point has not been
2
level reaches the set point, the
2
105
110
(41)
(43)
HIGH LIMIT
CURVE
100
105
110
(41)
(43)
2
3
4
5
6
7
Sensor Maximum Range Setting
2
2
800 ppm
900 ppm
1000 ppm
1100 ppm
8
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