Configuration - Bryant Legacy 574D----A Installation Instructions Manual

Fig. 36 - - Filter Installation (See through view)
Top filter
rack
Screw
(Note 4 and 5)
Bottom
filter rack
BENT COIL
Top filter
rack
Bottom
filter rack
STRAIGHT COIL
Fig. 37 - - Indoor Coil with Filter Rack
Filter
Clips
Aluminum
Filter
A09704
Evaporator
Coil
Evaporator
Coil
A09714
47

CONFIGURATION

Economizer Standard Sensors
OUTDOOR AIR TEMPERATURE (OAT) SENSOR— The
outdoor air temperature sensor (HH57AC080) is a 10 to 20mA device
used to measure the outdoor- -air temperature. The outdoor- -air
temperature is used to determine when the Economizer can be used
for free cooling. The operating range of temperature measurement is
40 to 100_F (4.4 to 37.8_C). The sensor has 8 selectable temperature
changeover setpoints. The temperature changeover is set using 3 dip
switches on the sensor. The ABCD potentiometer on the controller
should be set to the "D" position. See Fig. 40.
SUPPLY AIR TEMPERATURE (SAT) SENSOR—The supply
air temperature sensor is a 3 KΩ thermistor located at the inlet of the
indoor fan. See Fig. 38. The operating range of temperature
measurement is 0_ to 158_F (- -17.8_ to 70_C). See Table 20 for
sensor temperature/resistance values. 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.
Table 20 – Supply Air Sensor Temperature/Resistance Values
TEMPERATURE
CELSIUS (_C)
(_F)
--- 22 --- 30
--- 4 --- 20
14 --- 10
32 0
50 10
68 20
77 25
86 30
104 40
122 50
140 60
158 70
Supply Air Temperature
Sensor (SAT)
Indoor
Blower
Fig. 38 - - SAT Location
LOW TEMPERATURE
SWITCH—The Economizer is equipped with a low ambient
temperature lockout switch located in the outdoor airstream which is
used to lock out the compressors below a 42_F (5.6_C) ambient
temperature.
RESISTANCE (OHMS)
53,010
29,091
16,590
9,795
5,970
3,747
3,000
2,416
1,597
1,080
746
525
A09707
COMPRESSOR LOCKOUT