Bryant 551A operation manual EconoMi$er Troubleshooting, Problem Potential Cause Remedy

Table 19 — EconoMi$er Troubleshooting

	PROBLEM	POTENTIAL CAUSE	REMEDY
Damper Does Not		Indoor (Evaporator) Fan is	Check to ensure that 24 vac is present at Terminal C1 (Common Power)
Open		Off	on the IFC (Indoor [Evaporator] Fan Contactor) or that 24 vac is present at
			the IFO (Indoor [Evaporator] Fan On) terminal. Check whether 24 vac is
			present at PL6-1 (red wire) and/or PL6-3 (black wire). If 24 vac is
			not present, check wiring (see unit label diagram).
			Check proper thermostat connection to G on the connection board.
		No Power to EconoMi$er	Check to ensure that 24 vac is present across Terminals 24 VAC and
		Controller	24 V COM on the EconoMi$er control. If 24 vac is not present, check wiring
			(see unit label diagram). If 24 vac is present, STATUS light should be on
			constantly.
		No Power to G Terminal	If IFM is on, check to ensure 24 vac is present on G Terminal of the
			EconoMi$er controller. If 24 vac is not present, check wiring (see unit
			label diagram).
		Controller Fault	If STATUS light is flashing one flash, the EconoMi$er controller is
			experiencing a fault condition. Cycle power to the controller. If condition
			continues, replace the EconoMi$er controller.
		Thermostat Fault	If STATUS light is flashing two flashes, the EconoMi$er controller senses that
			the thermostat is wired incorrectly. Check wiring between the thermostat
			and the connection board in the electrical panel. The fault condition is
			caused by Y2 being energized before Y1.
		Actuator Fault	Check the wiring between the EconoMi$er controller and the actuator.
			Hold CONFIG button between 3 and 10 seconds to verify the
			actuator’s operation. (This process takes 3 minutes to complete.)
EconoMi$er		Minimum Position Set	Verify that the MIN POS (%) is set greater than zero. Adjust MIN POS (%)
Operation Limited to		Incorrectly	to 100% to verify operation, and then set to correct setting.
Minimum Position		EconoMi$er Changeover	Set at correct value. See Table 6.
		Set Point Set Too High or
		Too Low
		Discharge Air	If STATUS light is flashing 4 flashes, Discharge Air Thermistor is
		Thermistor Faulty	faulty. Check wiring or replace sensor.
		Outdoor Air Temperature	If STATUS light is flashing 5 flashes, Outdoor Air Temperature Sensor is
		Sensor Faulty	faulty. Check wiring or replace sensor.
Damper Position		Supply Air Low Limit	The supply-air temperature is less than 45 F, causing the minimum
Less than Minimum		Strategy Controlling	position to be decreased. Refer to the Start-Up instructions. Verify correct
Position Set Point			setting of MIN POS (%). If correct, EconoMi$er is operating correctly.
Damper Does Not		CO2 Ventilation Strategy	If a CO2 sensor is being used, and the damper position is greater than
Return to Minimum		Controlling	minimum position, the ventilation control strategy is controlling. Refer to
Position			the Start-Up instructions. EconoMi$er is operating correctly.
Damper Does Not		Damper Travel is	Check to ensure the damper is not blocked.
Close on Power Loss		Restricted
	LEGEND
IFM	— Indoor Fan Motor
PL	— Plug

Table 20 — Perfect Humidity™ Dehumidification Subcooler Service Analysis

PROBLEM	CAUSE		REMEDY
Subcooler will not energize	No power to subcooler	Check power source. Ensure all wire connections
	control transformer.	are tight.
	No power from subcooler control transformer	1.	Fuse open; check fuse. Ensure continuity of wiring.
	to liquid line three way valve.	2.	Subcooler control low-pressure switch open.
			Cycle unit off and allow low-pressure switch
			to reset. Replace switch if it will not close.
		3.	Transformer bad; check transformer.
	Liquid line three-way valve	1.	Solenoid coil defective; replace.
	will not operate.	2.	Solenoid valve stuck closed; replace.
Subcooler will not deenergize	Liquid Line three-way valve	Valve is stuck open; replace.
	will not close.
Low system capacity	Low refrigerant charge or	1.	Check charge amount. See system charging
	frosted coil.		section.
		2.	Evaporator coil frosted; check and replace
			subcooler control low pressure switch if necessary.

Copyright 2001 Bryant Heating & Cooling Systems CATALOG NO. 5355-105