Carrier 48HJ004---007 ECONOMI$ER IV Standard Sensors, Outdoor Air Temperature OAT Sensor

NOTE: These instructions are for installing the optional EconoMi$er IV and EconoMi$er2 only. Refer to the accessory EconoMi$er IV or EconoMi$er2 installation instructions when field installing an EconoMi$er IV or EconoMi$er2 accessory.

1.To remove the existing unit filter access panel, raise the panel and swing the bottom outward. The panel is now disengaged from the track and can be removed. (See Fig. 31.)

2.The box with the economizer hood components is shipped in the compartment behind the economizer. The EconoMi$er IV controller is mounted on top of the EconoMi$er IV in the position shown in Fig. 26. The optional EconoMi$er2 with 4 to 20 mA actuator signal control does not include the EconoMi$er IV controller. To remove the component box from its shipping position, remove the screw holding the hood box bracket to the top of the economizer. Slide the hood box out of the unit. (See Fig. 32.)

IMPORTANT: If the power exhaust accessory is to be installed on the unit, the hood shipped with the unit will not be used and must be discarded. Save the aluminum filter for use in the power exhaust hood assembly.

3.The indoor coil access panel will be used as the top of the hood. Remove the screws along the sides and bottom of the indoor coil access panel. (See Fig. 33.)

4.Swing out indoor coil access panel and insert the hood sides under the panel (hood top). Use the screws provided to attach the hood sides to the hood top. Use screws provided to attach the hood sides to the unit. (See Fig. 34.)

5.Remove the shipping tape holding the economizer barometric relief damper in place.

6.Insert the hood divider between the hood sides. (See Fig. 34 and 35.) Secure hood divider with 2 screws on each hood side. The hood divider is also used as the bottom filter rack for the aluminum filter.

7.Open the filter clips which are located underneath the hood top. Insert the aluminum filter into the bottom filter rack (hood divider). Push the filter into position past the open filter clips. Close the filter clips to lock the filter into place. (See Fig. 35.)

8.Caulk the ends of the joint between the unit top panel and the hood top. (See Fig. 33.)

9.Replace the filter access panel.

10.Install all EconoMi$er IV accessories. EconoMi$er IV wiring is shown in Fig. 36. EconoMi$er2 wiring is shown in Fig. 37.

Barometric flow capacity is shown in Fig. 38. Outdoor air leakage is shown in Fig. 39. Return air pressure drop is shown in Fig. 40.

FILTER ACCESS PANEL

COMPRESSOR

ACCESS PANEL

OUTDOOR-AIR OPENING AND

INDOOR COIL ACCESS PANEL

C06023

Fig. 31 ---Typical Access Panel Locations

			x
		o
o		B		HOOD BOX
H	od
				BRACKET

Fig. 32 ---Hood Box Removal	C06024
		48HE,HJ
SIDE
PANEL

			TOP
			SIDE
		CAULK	PANEL
		HERE
	INDOOR		INDOOR
	COIL		COIL
	ACCESS		ACCESS
	PANEL		PANEL
			C06025
	Fig. 33 ---Indoor Coil Access Panel Relocation
			TOP
			PANEL
			INDOOR COIL
			ACCESS PANEL
LEFT
HOOD	B	SCREW
SIDE
	19 1/16”
			33 3/8”
	HOOD DIVIDER
			C06026
	Fig. 34 ---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. 29.) The operating range of temperature measurement is 40_ to 100_F.

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