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EconoMi$e r IV Preparation
This procedure is used to prepare the EconoMi$er IV for
troubleshooting. No trouble shooting or testing is done by
performing the following procedure.
NOTE: T his procedure requires a 9--v battery, 1.2
kilo--ohm resistor, and a 5.6 kilo--ohm resistor which are
not supplie d with the EconoMi$er IV.
IMPORTANT: Be sure to record the positions of al l
potentiometers before starting troubleshooting.
1. Disc onnect power a t TR and TR1. All LEDs should
be off. Exhaust fan contacts should be open.
2. Disc onnect device a t P and P1.
3. Jumper P to P1.
4. Disc onnect wires at T and T1. Place 5.6 kilo--ohm
resistor across T and T1.
5. Jumper TR to 1.
6. Jumper TR to N.
7. If connected, remove sensor from terminals SO and +.
Connect 1. 2 kilo--ohm 4074EJM checkout resistor
across terminals SO and +.
8. Put 620--ohm resistor across terminals SR and +.
9. Set minimum position, DCV setpoint, and exhaust
potentiometers fully CCW (counterclockwise).
10. Set DCV maximum position potentiometer fully CW
(clockwise).
11. Set enthalpy potentiometer to D.
12. Apply power (24 vac) to terminals TR and TR1.
Differential
Enthalpy
To check differential enthalpy:
1. Make sure EconoMi$er IV preparation procedure has
been performe d.
2. Place 620--ohm resistor across SO and +.
3. Place 1.2 kil o--ohm resistor across SR and +. The
Free Cool LED should be lit.
4. Remove 620--ohm resistor across SO and +. The Free
Cool LED should turn off.
5. Return EconoMi$er IV settings and wiring to normal
afte r completi ng troubleshooting.
Single
Enthalpy
To check single enthalpy:
1. Make sure EconoMi$er IV preparation procedure has
been performe d.
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$er IV settings and wiring to normal
afte r completi ng troubleshooting.
DCV (De mand Controlled Ventilation) and
Power
Exhaust
To check DCV and Power Exhaust:
1. Make sure EconoMi$er IV preparation procedure has
been performe d.
2. Ensure t erminals AQ and 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) and AQ1
(negat ive node). The L ED for bot h DCV and Exhaust
should turn on. The actua tor should drive to bet we en
90 and 95% open.
4. Turn the Exhaust potentiometer CW until the Exhaust
LED turns off. T he LED should turn off when the
potentiometer is approximately 90%. The actuator
should remain in position.
5. Turn the DCV setpoint potentiometer CW until the
DCV LED turns off. The DCV LED should turn off
when the potentiometer is approximately 9 -- v. The
actuator should drive fully closed.
6. Turn the DCV and Exhaust potent iometers CCW until
the Exhaust LED turns on. The exhaust contacts will
close 30 to 120 seconds after the Exhaust LED turns
on.
7. Return EconoMi$er IV settings and wiring to normal
afte r completi ng troubleshooting.
DCV Minimum and Maximum
Position
To check the DCV minimum and maximum position:
1. Make sure EconoMi$er IV preparation procedure has
been performe d.
2. Connect a 9--v battery to AQ (positive node) and AQ1
(negat ive node). The DCV L ED should turn on. The
act uator should drive to between 90 and 95% open.
3. Turn the DCV Maximum Position potentiometer to
midpoint. The actuator should drive to between 20
and 80% open.
4. Turn the DCV Maximum Position potentiometer to
fully CCW. The actuator should drive fully closed.
5. Turn the Minimum Position potentiometer to
midpoint. The actuator should drive to between 20
and 80% open.
6. Turn the Minimum Position Potentiometer fully CW.
The actuat or should drive fully open.
7. Remove the jumper from TR and N. The actuator
should drive fully closed.
8. Return EconoMi$er IV settings and wiring to normal
afte r completi ng troubleshooting.
Supply--A ir Sensor
Input
To check supply--air sensor i nput:
1. Make sure EconoMi$er IV preparation procedure has
been performe d.
2. Set the Enthalpy potentiometer to A. The Free Cool
LED turns on. The actuator should drive to between
20 and 80% open.
3. Remove the 5. 6 kilo--ohm resistor and jumper T to
T1. The actuator should drive fully open.
4. Remove the jumper across T and T1. The actuator
should drive fully closed.
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