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Table 24 – EconoMi$er IV Sensor Usage

APPLICATION

ECONOMI$ER IV WITH OUTDOOR AIR DRY

BULB SENSOR

Accessories Required

Outdoor Air

Dry Bulb

None. The outdoor air dry bulb sensor is

factory installed.

Differential

Dry Bulb

CRTEMPSN002A00*

Single Enthalpy HH57AC078

Differential

Enthalpy

HH57AC078 and CRENTDIF004A00*

for DCV

Control using a

Wall-Mounted

Sensor

33ZCSENCO2

for DCV

Control using a

Duct-Mounted

Sensor

33ZCSENCO2† and

33ZCASPCO2**

CRCBDIOX005A00††

* CRENTDIF004A00 and CRTEMPSN002A00 accessories are

used on many different base units. As such, these kits may

contain parts that will not be needed for installation.

† 33ZCSENCO2 is an accessory CO

sensor.

** 33ZCASPCO2 is an accessory aspirator box required for

duct-mounted applications.

†† CRCBDIOX005A00 is an access ory that contains both

33ZCSENCO2 and 33ZCASPCO2 accessories.

3. Use the Up/Down button to sel ect the preset

number. (See Table 23.)

4. Press Enter to lock in the selection.

5. Press Mode to exit and resume normal operation.

The custom settings of the CO

sensor can be changed

anytime after the sensor is energized. Follow the steps

below t o c hange the non-standard settings:

1. Press Clear and Mode buttons. Hold at least 5

seconds until the sensor enter s the Edit mode.

2. Press Mode twice. The STDSET Menu will appear.

3. Use the Up/Down button to toggle to the NONSTD

menu and press Enter.

4. Use the Up/Down button to toggle through each of

the nine variables, starting with Altitude, until the

desired setting is reached.

5. Press Mode to move through the variables.

6. Press Enter to lock in the selection, then press Mode

to continue to the next variable.

Dehumidification of Fresh Air with DCV (Demand

Controlled Ventilation) Control

If normal rooftop heating and cooling operation is not

adequa te for the outdoor humidity level, an energy

recove ry unit and/or a dehumidification option should be

considered.

EconoMi$e r IV Pr

eparation

This procedure is used to prepare the EconoMi$er IV for

troubleshooting. No troubleshooting or testi ng is done by

performing the following procedure.

NOTE: This procedure requires a 9--v battery, 1.2

kilo--ohm resistor, and a 5.6 kilo--ohm resistor which are

not supplied with the EconoMi$er IV.

IMPORTANT: Be sure to record the positions of all

potentiometers before starting troubleshooting.

1. Disconnect power at TR a nd TR1. All LEDs should

be off. Exhaust fan contacts should be open.

2. Disconnect device at P and P1.

3. Jumper P to P1.

4. Disconnect wires at T and T 1. Place 5.6 kilo--ohm

resistor across T and T1.

5. Jumper TR to 1.

6. Jumper TR to N.

7. If connected, remove sensor from terminals SO and +.

Connect 1.2 kilo--ohm 4074EJM checkout resistor

across terminals SO and +.

8. Put 620--ohm resistor across term inals SR and +.

9. Set minimum position, DCV setpoint, and e xhaust

potentiometers fully CCW (counterclockwise).

10. Set DCV maximum position potentiometer fully CW

(clockwise).

11. Set enthalpy potentiometer to D.

12. Apply power (24 vac) to terminals TR and TR1.

Differential

Enthalpy

To check differential enthalpy:

1. Make sure EconoMi$er IV preparation procedure has

been performed.

2. Place 620--ohm resistor across SO and +.

3. Place 1.2 kilo--ohm resistor across SR and +. The

Free Cool LED should be lit.

4. Remove 620--ohm resistor a cross SO and +. The Free

Cool LED should turn off.

5. Return EconoMi$er IV settings and wiring to normal

afte r completing troubleshooting.

Single

Enthalpy

To check single enthalpy:

1. Make sure EconoMi$er IV preparation procedure has

been performed.

2. Set the enthalpy potentiometer to A (fully CCW). The

Free Cool LED should be lit.

3. Set the enthalpy potentiometer to D (fully CW). The

Free Cool LED should turn off.

4. Return EconoMi$er IV settings and wiring to normal

afte r completing troubleshooting.

DCV (Demand Controlled Ventilation) and

Power

Exhaust

To check DCV and Power Exhaust:

1. Make sure EconoMi$er IV preparation procedure has

been performed.

2. Ensure terminals AQ a nd AQ1 are open. The LED for

both DCV and Exhaust should be off. The actuator

should be fully closed.

3. Connect a 9--v battery to AQ (positive node) a nd AQ1

(negat ive node). The LED for both DCV and Exhaust

should turn on. The act uator should drive to between

90 and 95% open.

4. Turn the Exhaust potentiometer CW until the Exhaust

LED turns off. The LED should turn off when the

potentiometer is approximately 90%. The actuator

should remain in position.

580J

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