TROUBLESHOOTING
Unit Troubleshooting
Refer to Tables
Economi$er IV Troubleshooting
See Table 44 for EconoMi$er IV logic.
A functional view of the EconoMi$er IV is shown in Fig. 60. Typical settings, sensor ranges, and jumper positions are also shown. An EconoMi$er IV simulator program is available from your Bryant distributor to help with EconoMi$er IV training and troubleshooting.
Economi$er IV Preparation
This procedure is used to prepare the EconoMi$er IV for troubleshooting. No troubleshooting or testing is done by performing the following procedure.
NOTE: This procedure requires a
IMPORTANT: Be sure to record the positions of all potentiometers before starting troubleshooting.
1.Disconnect power at TR and TR1. All LEDs should be off. Exhaust fan contacts should be open.
2.Disconnect device at P and P1.
3.Jumper P to P1.
4.Disconnect wires at T and T1. Place 5.6
5.Jumper TR to 1.
6.Jumper TR to N.
7.If connected, remove sensor from terminals SO and +. Connect 1.2
8.Put
9.Set minimum position, DCV set point, and exhaust potentiometers fully CCW (counterclockwise).
10.Set DCV maximum position potentiometer fully CW (clockwise).
11.Set enthalpy potentiometer to D.
12.Apply power (24 vac) to terminals TR and TR1.
Differential Enthalpy
To check differential enthalpy:
1.Make sure EconoMi$er IV preparation procedure has been performed.
2.Place
3.Place 1.2
4.Remove
5.Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.
Single Enthalpy
To check single enthalpy:
1.Make sure EconoMi$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$er IV settings and wiring to normal after completing troubleshooting.
DCV (Demand Controlled Ventilation) and Power Exhaust
To check DCV and Power Exhaust:
1.Make sure EconoMi$er IV preparation procedure has been performed.
2.Ensure terminals AQ and AQ1 are open. The LED for both DCV and Exhaust should be off. The actuator should be fully closed.
3.Connect a
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.
5.Turn the DCV set point potentiometer CW until the DCV LED turns off. The DCV LED should turn off when the potentiometer is approximately 9v. The actuator should drive fully closed.
6.Turn the DCV and Exhaust potentiometers 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$er IV settings and wiring to normal after completing troubleshooting.
DCV Minimum and Maximum Position
To check the DCV minimum and maximum position:
1.Make sure EconoMi$er IV preparation procedure has been performed.
2.Connect a
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 actuator should drive fully open.
7.Remove the jumper from TR and N. The actuator should drive fully closed.
8.Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.
Supply-Air Input
To check
1.Make sure EconoMi$er IV preparation procedure has been performed.
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
4.Remove the jumper across T and T1. The actuator should drive fully closed.
5.Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.
581B,C
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