Bryant 28, Vi. Condenser-Fanadjustment, A. 551A155 and 180 Units Fig, B.551A240 Units Fig

VI. CONDENSER-FAN ADJUSTMENT

A. 551A155 and 180 Units (Fig. 33)

1.Shut off unit power supply.

2.Remove access panel(s) closest to the fan to be adjusted.

3.Loosen fan hub setscrews.

4.Adjust fan height on shaft using a straightedge placed across the fan orifice.

5.Tighten setscrews and replace panel(s).

6.Turn on unit power.

B.551A240 Units (Fig. 34)

1.Shut off unit power supply.

2.Remove fan top-grille assembly and loosen fan hub screws.

3.Adjust fan height on unit, using a straightedge placed across the fan orifice.

4.Tighten setscrews and replace rubber hubcap to pre- vent hub from rusting to motor shaft.

5.Fill hub recess with permagum if rubber hubcap is missing.

NOTE: Dimensions are in inches).

Fig. 33 — Condenser-Fan Adjustment,

551A155,180

NOTE: Dimensions are in inches.

Fig. 34 — Condenser-Fan Adjustment,

551A240

VII. ECONOMI$ER ADJUSTMENT

A. LED Indication

The EconoMi$er controller features an onboard diagnostic LED (light-emitting diode) that flashes to indicate its status. See Table 17 for flash codes. The controller also has terminal connections (REM LED) for remotely mounting an LED, if desired. The flash code priorities are as follows:

1.On/Off or continuous flash

2.Critical fault

3.Non-critical fault

If any sensors are opened, shorted, or removed, the EconoMi$er determines whether the failure is critical or non-critical and flashes the appropriate code. If a non-critical sensor fault occurs (i.e., outdoor air humidity), the EconoMi$er automatically reconfigures its control strategy to a more appropriate mode. If a critical sensor fault occurs (i.e., supply air sensor), the EconoMi$er reverts to a safe mode of operation until the sensor problem is resolved.

B. Manual Configuration Pushbutton

The EconoMi$er controller also features an onboard button (CONFIG) to help troubleshoot the system. See Fig. 16. The button can perform 3 different functions.

Pressing the CONFIG button for more than three seconds, but less than ten seconds and then releasing will start the automatic test procedure. The damper will modulate fully open, wait, and modulate closed. This process takes three minutes to complete. Use this feature to determine if the actuator can be commanded.

If the CONFIG button is pressed and held for ten seconds and less than 30 seconds then released, the EconoMi$er con- troller reconfigures its mode of operation based on the sen- sors that are connected and functioning normally, and cancels the automatic test procedure.

If the EconoMi$er controller recognized a non-critical sensor fault, and flashed a code (i.e., FLASH 6, outdoor air humidity sensor fault) the FLASH CODE will be cleared, and normal operation begins. Ensure faulty sensor is removed before clearing faults.

If the EconoMi$er controller recognizes a critical sensor fault, and flashes a code (i.e., FLASH 4, discharge air ther- mostat fault) the FLASH code will not be cleared, and the EconoMi$er will remain in the safe operation mode. The sensor fault must be corrected to enable EconoMi$er to revert to normal operation.

Table 17 — EconoMi$er Control Module Flash Code Identification

	FLASH CODE	CAUSE	ACTION TAKEN BY ECONOMI$ER
	Constant On	Normal operation	Normal operation.
	Constant Off	No power	No operation.
	Continuous	CONFIG button pushed and held	Outdoor air damper is stroked fully open, then closed
	Flash	between 3 and 9 seconds	(automatic test procedure takes 3 minutes to complete).
Fault	Flash One	Control board fault	System shutdown.
	Flash Two	Thermostat fault (i.e., Y2 without Y1)	System shutdown until corrected.
	Flash Three	Actuator fault	Revert to mechanical cooling only.
Critical			Continue operation with damper at minimum position.
	Flash Four	Discharge air thermistor fault	Continue operation with damper at minimum position.
			Revert to mechanical cooling only.
	Flash Five	Outdoor air temperature sensor fault	Disable mechanical cooling lockout.
Fault	Flash Six	Outdoor air humidity sensor fault	Continue operation with dry bulb or dry bulb differential switchover.
	Flash Seven		Continue operation with single enthalpy EconoMi$er
		Return air temperature sensor fault	switchover or dry bulb EconoMi$er switchover (without
Critical			humidity sensor).
	Flash Eight	Return air humidity sensor fault	Continue operation with single enthalpy, differential dry
			bulb, or dry bulb EconoMi$er switchover.
Non-	Flash Nine	Carbon Dioxide (CO2) sensor fault	Continue operation without ventilation control.
	Flash Ten	Onboard adjustment potentiometer fault	Continue operation with default potentiometer settings.

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