Carrier 50TJ016-028 EconoMi$er Adjustment, EconoMi$er Control Module Flash Code Identification

EconoMi$er Adjustment

LED INDICATION — The EconoMi$er controller features an onboard diagnostic LED (light-emitting diode) that flashes to indicate its status. See Table 15 for flash codes. The control- ler 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 auto- matically 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.

MANUAL CONFIGURATION PUSHBUTTON — The EconoMi$er controller also features an onboard button (CON- FIG) 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 auto- matic 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 sensors 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$er controller recognizes a critical sensor fault, and flashes a code (i.e., FLASH 4, discharge air thermo- stat fault) the FLASH code will not be cleared, and the EconoMi$er will remain in the safe operation mode. The

sensor fault must be corrected to enable EconoMi$er to revert to normal operation.

If the CONFIG button is pressed and held for more than

30 seconds and released, the EconoMi$er controller will enable the enthalpy comparison strategy (with outdoor air enthalpy and return air enthalpy sensors installed).

Power Failure — Dampers have a spring return. In event of power failure, dampers will return to fully closed position until power is restored. Do not manually operate damper motor.

Refrigerant Charge — Amount of refrigerant charge is listed on unit nameplate and in Table 1. Refer to Carrier GTAC II; Module 5; Charging, Recovery, Recycling, and Reclamation section for charging methods and procedures. Unit panels must be in place when unit is operating during charging procedure.

NOTE: Do not use recycled refrigerant as it may contain con- taminants.

NO CHARGE — Use standard evacuating techniques. After evacuating system, weigh in the specified amount of refriger- ant (refer to Table 1).

LOW CHARGE COOLING — Using cooling charging chart (see Fig. 36), add or remove refrigerant until conditions of the chart are met. Note that charging chart is different from those normally used. An accurate pressure gage and temperature- sensing device is required. Charging is accomplished by ensur- ing the proper amount of liquid subcooling. Measure liquid line pressure at the liquid line service valve using pressure gage. Connect temperature sensing device to the liquid line near the liquid line service valve and insulate it so that outdoor ambient temperature does not affect reading.

TO USE THE COOLING CHARGING CHART — Use the above temperature and pressure readings, and find the intersec- tion point on the cooling charging chart. If intersection point on chart is above line, add refrigerant. If intersection point on chart is below line, carefully recover some of the charge. Re- check suction pressure as charge is adjusted. NOTE: Indoor-air CFM must be within normal operating range of unit. All out- door fans must be operating.

The TXV (thermostatic expansion valve) is set to maintain between 15 and 20 degrees of superheat at the compressors. The valves are factory set and should not require re-adjustment.

Table 15 — EconoMi$er Control Module Flash Code Identification

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