FROM FUSE BLOCK
BLK | YEL | BLU |
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TO PRESSURE 
TRANSDUCER
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TO MOTOR(S)
Fig. 24 — Motormaster® V Control
XIII. STEP 13 — ADJUST
See Fig. 25 and 26 for EconoMi$erIV component locations.
NOTE: These instructions are for installing the optional EconoMi$erIV only. Refer to the accessory EconoMi$erIV or EconoMi$er2 installation instructions when field installing an EconoMi$erIV or EconoMi$er2 accessory.
To complete installation of the optional EconoMi$erIV, per- form the following procedure.
1.Remove the EconoMi$erIV hood. Refer to Step 11 — Install
2.Relocate outdoor air temperature sensor from ship- ping position to operation position on EconoMi$erIV. See Fig. 25.
IMPORTANT: Failure to relocate the sensor will result in the EconoMi$erIV not operating properly.
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LOW TEMPERATURE
COMPRESSOR
LOCKOUT SWITCH
Fig. 25 — EconoMi$erIV Component Locations —
End View
SUPPLY AIR
TEMPERATURE SENSOR
LOCATION
ECONOMI$ERIV 
ACTUATOR
CONTROLLER 
FLANGE
AND SCREWS (HIDDEN)
Fig. 26 — EconoMi$erIV Assembled in Unit —
Side View
4.Install all EconoMi$erIV accessories. EconoMi$erIV wiring is shown in Fig. 27.
Outdoor air leakage is shown in Table 8. Return air pressure drop is shown in Table 9.
Table 8 — Outdoor Air Damper Leakage
| DAMPER STATIC PRESSURE (in. wg) | |||||
| 0.2 | 0.4 | 0.6 | 0.8 | 1.0 | 1.2 |
LEAKAGE (cfm) | 35 | 53 | 65 | 75 | 90 | 102 |
Table 9 — Return Air Pressure Drop (in. wg)
CFM
4500 | 5000 | 5400 | 6000 | 7200 | 7500 | 9000 | 10,000 | 11,250 |
0.040 | 0.050 | 0.060 | 0.070 | 0.090 | 0.100 | 0.110 | 0.120 | 0.140 |
B. EconoMi$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
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. 26. 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 air stream which is used to lockout the compressors below a 42 F ambient tem- perature. See Fig. 25.
