Bryant 581B036--072 Installation Instructions Manual page 24

CONTROL
CONTROL POINT
CURVE
APPROX. deg. F (deg. C)
A
B
C
D
The same equation can be used to determine the occupied or
maximum ventilation rate to the building. For example, an output
of 3.6 volts to the actuator provides a base ventilation rate of 5%
and an output of 6.7 volts provides the maximum ventilation rate
of 20% (or base plus 15 cfm per person). Use Fig. 37 to
determine the maximum setting of the CO
a 1100 ppm set point relates to a 15 cfm per person design. Use
the 1100 ppm curve on Fig. 40 to find the point when the CO
sensor output will be 6.7 volts. Line up the point on the graph
with the left side of the chart to determine that the range
configuration for the CO sensor should be 1800 ppm. The
2
EconoMi$er IV controller will output the 6.7 volts from the CO
sensor to the actuator when the CO
at 1100 ppm. The DCV set point may be left at 2 volts since the
CO sensor voltage will be ignored by the EconoMi$er IV
2
controller until it rises above the 3.6 volt setting of the minimum
position potentiometer.
Once the fully occupied damper position has been determined, set
the maximum damper demand control ventilation potentiometer
to this position. Do not set to the maximum position as this can
result in over-ventilation to the space and potential high-humidity
levels.
AT 50% RH
73 (23)
70 (21)
67 (19)
63 (17)
65
(18)
60
(16)
A
55
(13)
B
50
C
(10)
45 D
(7)
40
(4)
35
(2)
35 40
45 50 55 60 65
(2) (4) (7) (10) (13) (16) (18)
APPROXIMATE DRY BULB TEMPERATURE--degrees F (degrees C)
Fig. 38 --- Enthalpy Changeover Set Points
sensor. For example,
2
concentration in the space is
2
85 90 95 100
(29) (32) (35) (38)
80
(27)
75
(24)
70
(21)
A
B
C
D
70 75 80 85 90 95 100
(21) (24) (27) (29) (32) (35) (38)
N1
N
2V
EXH
P1
P
T1
T
2
2V
AQ1
DCV
2
AQ
SO+
2V
SO
Free
SR+
Cool
SR
A
Fig. 39 --- EconoMi$er IV Control
24
105 110
(41) (43)
HIGH LIMIT
CURVE
105 110
(41) (43)
EXH TR
Set
10V
24
Vac
HOT
Min
Pos
+
Open
DCV
1
Max
10V
DCV
3
Set
10V
EF
C
B
D
C06037
TR1
24 Vac
COM
_
2
5
4
EF1
C06038