Filter
Top Products
19
H
o
o
d
B
o
x
HOOD BOX
BRACKET
C06024
Fig. 25 --- Hood Box Removal
SIDE
PANEL
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
CAULK
HERE
TOP
SIDE
PANEL
C06025
Fig. 26 --- Indoor Coil Access Panel Relocation
B
TOP
PANEL
INDOOR COIL
ACCESS PANEL
19 1/16”
SCREW
HOOD DIVIDER
LEFT
HOOD
SIDE
33 3/8”
C06026
Fig. 27 --- Outdoor--Air Hood Construction
Economi$er IV Standard
Sensors
Outdoor Air Temperature (OAT) Sensor
The outdoor air temperature sensor (HH57AC074) is a 10 to 20
mA device used to measure the outdoor-air temperature. The
outdoor-air temperature is used to determine when the
EconoMi$er IV can be used for free cooling. The sensor is
factory-installed on the EconoMi$er IV in the outdoor airstream.
(See Fig. 23 and 33.) The operating range of temperature
measurement is 40_ to 100_F.
Supply Air Temperature (SAT) Sensor
The supply air temperature sensor is a 3k ohm thermistor located
at the inlet of the indoor fan. (See Fig. 34.) This sensor is factory
installed. The operating range of temperature measurement is 0
to 158_F. See Table 5 for sensor temperature/resistance values.
Table 5—Supply Air Sensor Temperature/
Resistance Values
TEMPERATURE (F) RESISTANCE (ohms)
–58
200,250
–40
100,680
–22
53,010
–4
29,091
14
16,590
32
9,795
50
5,970
68
3,747
77
3,000
86
2,416
104
1,597
122
1,080
140
746
158
525
176
376
185
321
194
274
212
203
230
153
248
116
257
102
266
89
284
70
302
55
17 1/4”
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER
FILTER
HOOD
FILTE
R
CLIP
OUTSIDE
AIR
C06027
Fig. 28 --- Filter Installation
The temperature sensor looks like an eyelet terminal with wires
running to it. The sensor is located in the “crimp end” and is
sealed from moisture.
OutdoorAir Lockout Sensor
The Economi$er IV is equipped with an ambient temperature
lockout switch located in the outdoor air stream which is used to
lockout the compressors below a 42_F ambient temperature. (See
Fig. 23.)
581B,C