Troubleshooting Analysis Table

COMPLAINT		PROBABLE CAUSE		REMEDY
COMPLAINT		PROBABLE CAUSE		REMEDY
	1.	Excessive charge of refrigerant in system.	1.	Purge or pump-down excessive charge.
	2.	Inadequate supply of air across the	2.	Make certain that coil is not fouled in any
1. High Head Pressure		condenser coil.		way, or that air is not re-circulating.
	3.	Non-condensate gases in the system.	3.	Purge these gases from the system.
				Recharge system, if necessary.
2. Low Head Pressure	1.	System low on refrigerant.	1.	Charge system until sight glass is clear of bubbles.
2. Low Head Pressure	2.	Compressor valves broken.	2.	Replace compressor.
	2.	Compressor valves broken.	2.	Replace compressor.
	1.	Liquid line valve closed.	1.	Open the liquid line valve.
	2.	Restricted liquid line.	2.	Replace filter-dryer.
	3.	The bulb of the thermal expansion valve	3.	Detach the bulb from the suction line and hold
		has lost its charge.		in one hand. If no liquid refrigerant goes through
				the valve, replace the valve.
3. Low Suction Pressure	4. System low on refrigerant.		4.	Test the unit for leaks. Add refrigerant until sight
				glass is free from bubbles, after repairing leak.
	5.	Dirty filters.	5.	Clean or replace filter.
	6.	Coil frosted up.	6.	Defrost and clean coil. Clean or replace filters.
	7.	Flash gas in the liquid line.	7.	Excessive liquid line drop. Check liquid line size.
	8.	Quantity of air through evaporator not adequate.	8.	Increase the blower speed.

	1.	Expansion valve stuck open.	1.	Correct valve action or replace the valve.
4. High Suction Pressure	2.	Expansion valve bulb not in contact with	2.	Fasten bulb securely to suction line.
4. High Suction Pressure		suction line.
		suction line.
	3.	Suction and/or discharge valve leaking or broken.	3.	Replace compressor.
	1.	Disconnect switch open.	1.	Close the disconnect switch.
	2.	Blow fuse or fuse at disconnect switch.	2.	Check the cause of failure and replace the fuse.
	3.	Thermostat set too high.	3.	Adjust to lower temperature.
5. Compressor will not start.	4. Selector switch in "Off" position.		4.	Turn selector switch knob to "Cool" position.
	5.	Contactor and/or relay coils burned out.	5.	Replace contactor and/or relay.
	6.	Loose or open electrical connection in either	6.	Inspect and secure all electrical connections.
		the control or power circuit.

Wiring Diagram

HIGH VOLTAGE!

DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT.

MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY

CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

CONDENSING AC UNIT SINGLE / THREE PHASE AIR CONDITIONERS, IO-402G specifications

Goodman Manufacturing's IO-402G is a prominent model in the realm of condensing air conditioning units, designed to serve both residential and commercial applications effectively. This unit stands out due to its robust construction and impressive energy efficiency, making it a reliable choice for air conditioning needs.

One of the main features of the IO-402G is its versatile power options, available in both single and three-phase configurations. This adaptability allows it to meet various electrical requirements, ensuring compatibility with different installation environments. The unit's design incorporates a high-efficiency scroll compressor, which not only optimizes cooling performance but also enhances durability while significantly reducing operational noise.

The IO-402G is equipped with advanced refrigerant management technology, utilizing R-410A refrigerant, which is environmentally friendly and delivers superior cooling efficiency compared to older refrigerants. This feature reflects Goodman’s commitment to sustainability while also aligning with regulatory changes in refrigerant usage. The unit’s efficiency is further complemented by a high SEER (Seasonal Energy Efficiency Ratio) rating, positioning it among the more energy-efficient systems available in the market today.

In terms of construction, the IO-402G boasts a durable cabinet designed to withstand various weather conditions, featuring a powder-coated finish that resists corrosion and fading. The unit also includes sound-dampening technology to minimize operational noise, ensuring that it operates quietly even in residential settings.

Additionally, the IO-402G provides easy access for service and maintenance, thanks to a user-friendly design that simplifies troubleshooting and repairs. The system is also compatible with a range of Goodman’s thermostats and controls, which can enhance user experience through smart technology and programmable settings.

Furthermore, Goodman’s commitment to quality is reflected in the warranty coverage available with the IO-402G, typically offering a generous limited warranty on parts, underscoring the manufacturer’s confidence in the unit’s longevity and performance.

Overall, the Goodman IO-402G condensing AC unit is an excellent choice for those seeking a reliable, efficient, and durable air conditioning solution for both residential and commercial applications. Its innovative design and thoughtful features make it a standout model in Goodman’s lineup, ensuring comfort and satisfaction for users all year round.