296
APPLICATION DATA (cont)
ECONOMI$ER IV SENSOR USAGE CHART

*CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on many different base units. As such, these kits may contain parts that will not be needed

for installation.

†CGCDXSEN004A00 is an accessory CO2 sensor.

**CGCDXASP001A00 is an accessory aspirator box required for duct-mounted applications.

Economizer Changeover Curves
CONTROL
CURVE
A
B
C
D
CONTROL POINT
APPROX. °F (°C)
AT 50% RH
73 (23)
70 (21)
67 (19)
63 (17)
12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46
90
100
80
70
60
50
40
30
20
10
ENTHALPY—BTU PER POUND DRY AIR
85
(29)
90
(32)
95
(35)
100
(38)
105
(41)
110
(43)
35
(2)
35
(2)
40
(4)
40
(4)
105
(41)
110
(43)
45
(7)
45
(7)
50
(10)
50
(10)
55
(13)
55
(13)
60
(16)
60
(16)
65
(18)
65
(18)
70
(21)
70
(21)
75
(24)
75
(24)
80
(27)
80
(27)
85
(29)
90
(32)
95
(35)
100
(38)
APPROXIMATE DRY BULB TEMPERATURE— °F
(
°C
)
AABBCCDD
RELATIVE HUMIDITY (%)
HIGH LIMITCURVE

a50-7751

APPLICATION ECONOMI$ERIV WITH OUTDOOR AIR

DRY BULB SENSOR ECONOMI$ERIV WITH SINGLE

ENTHALPY SENSOR

Accessories Required Accessories Required

Outdoor Air Dry Bulb None. The outdoor air dry bulb sensor is factory installed. CRTEMPSN002A00*

Differential Dry Bulb CRTEMPSN002A00* (2) CRTEMPSN002A00*

Single Enthalpy HH57AC078 None. The single enthalpy sensor is factory installed.

Differential Enthalpy HH57AC078

and

CRENTDIF004A00* CRENTDIF004A00*

CO2 for DCV Control using a

Wall-Mounted CO2 Sensor CGCDXSEN004A00

CO2 for DCV Control using a

Duct-Mounted CO2 Sensor

CGCDXSEN004A00†

and

CGCDXASP001A00**