Bryant 581B036--072 Supply Air Temperature SAT Sensor, Outdoor Air Lockout Sensor, Temperature F

			x
		o
o		B		HOOD BOX
H	od
				BRACKET

C06024

Fig. 25 ---Hood Box Removal

SIDE

PANEL

			TOP
			SIDE
		CAULK	PANEL
		HERE
	INDOOR		INDOOR
	COIL		COIL
	ACCESS		ACCESS
	PANEL		PANEL
			C06025
Fig. 26 ---Indoor Coil Access Panel Relocation
			TOP
			PANEL
			INDOOR COIL
			ACCESS PANEL
LEFT
HOOD		SCREW
SIDE	B
	19 1/16”
			33 3/8”
	HOOD DIVIDER
			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

OUTSIDE

AIR

HOOD

CLEANABLE ALUMINUM FILTER

FILTER

BAROMETRIC RELIEF

FILTER CLIP

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.

Outdoor Air 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

19