Bryant DURAPAC 579F Installation, Start-Up And Service Instructions Manual page 15

TO PRESSURE
TRANSDUCER
Fig. 23 — Motormaster® V Control
FRAME
ECONOMI$ERIV
SCREWS
TOP
Fig. 24 — EconoMi$erIV Component Locations —
End View
ECONOMI$ERIV
ACTUATOR
CONTROLLER
FLANGE
AND SCREWS
(HIDDEN)
Fig. 25 — EconoMi$erIV Assembled in Unit —
Side View
FROM FUSE BLOCK
B
13B
13C
12 13A
2 5 6 2
1 2 3
TO MOTOR(S)
OUTDOOR AIR
TEMPERATURE SENSOR
(INSTALLED OPERATION
SCREWS
POSITION)
LOW TEMPERATURE
COMPRESSOR
LOCKOUT SWITCH
SUPPLY AIR
TEMPERATURE SENSOR
LOCATION
Table 8 — Outdoor Air Damper Leakage
LEAKAGE (cfm)
Table 9 — Return Air Pressure Drop (in. wg)
4500 5000 5400
0.040 0.050 0.060 0.070 0.090 0.100 0.110
B. EconoMi$erIV Standard Sensors
Outdoor Air Temperature (OAT) Sensor
The outdoor air temperature sensor (HH57AC074) is a 10 to
20 mA device used to measure the outdoor-air temperature.
The outdoor-air temperature is used to determine when the
EconoMi$erIV can be used for free cooling. The sensor must
be field-relocated. See Fig. 24. The operating range of tem-
perature measurement is 40 to 100 F.
Supply Air Temperature (SAT) Sensor
The supply air temperature sensor is a 3 K thermistor
located at the inlet of the indoor fan. See Fig. 25. This sensor
is factory installed. The operating range of temperature
measurement is 0° to 158 F. See Table 10 for sensor tempera-
ture/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.
Low Temperature Compressor Lockout Switch
The EconoMi$erIV is equipped with an ambient tempera-
ture lockout switch located in the outdoor airstream which is
used to lock out the compressors below a 42 F ambient tem-
perature. See Fig. 24.
Table 10 — Supply Air Sensor Temperature/
TEMPERATURE (F)
–58
–40
–22
–4
14
32
50
68
77
86
104
122
140
158
176
185
194
212
230
248
257
266
284
302
— 15 —
DAMPER STATIC PRESSURE (in. wg)
0.2 0.4 0.6 0.8
35 53 65 75
CFM
6000 7200 7500 9000 10,000 11,250
0.120
Resistance Values
RESISTANCE (ohms)
200,250
100,680
53,010
29,091
16,590
9,795
5,970
3,747
3,000
2,416
1,597
1,080
746
525
376
321
274
203
153
116
102
1.0 1.2
90 102
0.140
89
70
55