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CONTROL
CURVE
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
C
SR
B
D
A
Fig. 38 — EconoMi$er IV Control
To determine the minimum position setting, perform the
following procedure:
1. Calculate the appropriate mixed air temperature using the
following formula:
OA
(T
x
) + (TR x
O
100
T
= Outdoor-Air Temperature
O
OA = Percent of Outdoor Air
T
= Return-Air Temperature
R
RA = Percent of Return Air
T
= Mixed-Air Temperature
M
CONTROL POINT
APPROX. °F (°C)
AT 50% RH
A
73 (23)
B
70 (21)
C
67 (19)
D
63 (17)
60
(16)
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. 37 — Enthalpy Changeover Set Points
TR
TR1
24
24 Vac
Vac
COM
HOT
_
+
1
2
5
4
3
EF1
EF
RA
) = T
M
100
85
90
95
100
(29)
(32)
(35)
(38)
80
(27)
75
(24)
70
(21)
65
(18)
A
A
B
C
D
65
70
75
80
85
90
95
100
(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. 39 — CO
As an example, if local codes require 10% outdoor air
during occupied conditions, outdoor-air temperature is
60 F, and return-air temperature is 75 F.
(60 x .10) + (75 x .90) = 73.5 F
2. Disconnect the supply air sensor from terminals T and
T1.
3. Ensure that the factory-installed jumper is in place across
terminals P and P1. If remote damper positioning is being
used, make sure that the terminals are wired according to
Fig. 28 and that the minimum position potentiometer is
turned fully clockwise.
27
105
110
(41)
(43)
HIGH LIMIT
CURVE
105
110
(41)
(43)
2
3
4
5
6
7
Sensor Maximum Range Setting
2
800 ppm
900 ppm
1000 ppm
1100 ppm
8
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