Goodman Mfg CONDENSING AC UNIT SINGLE / THREE PHASE AIR CONDITIONERS Troubleshooting, Ft-lbs

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For the 7-1/2 ton unit starting charge should be 15 lb of R-22 and 18 lbs for the 10 ton unit. The length of line set, indoor unit airflow, condensing unit location and number of tubing fittings will have an impact on final unit charge amount. Turn the elec- trical power on, and let the system run. Wait for the refrigerant pressures to stabilize.

Charge Verification

WARNING

REFRIGERANT UNDER PRESSURE!

Do not overcharge system with refrigerant.

Do not operate unit in a vacuum or at negative pres-

sure.

Failure to follow proper procedures may cause property damage, personal injury or death.

CAUTION

Use refrigerant certified to AHRI standards. Use of used refrigerant may cause compressor damage that is not covered under warranty. Most portable machines cannot clean used refrigerant to meet AHRI standards.

NOTICE

Violation of EPA regulations may result in fines or other penalties.

CAUTION

Operating the compressor with the suction valve closed may cause serious compressor damage.

Final Charge Adjustment

The outdoor temperature must be 60°F or higher. Set the room thermostat to COOL, fan switch to AUTO, and set the tem- perature control well below room temperature.

After system has stabilized per startup instructions, check subcooling and superheat as detailed in the following section.

Expansion Valve System

1.Purge gauge lines. Connect service gauge manifold tobase-valve service ports. Run system at least 10 min- utes to allow pressure to stabilize.

2.Temporarily install thermometer on liquid (small) line near liquid line service valve with adequate contact and insu- late for best possible reading.

3.Check subcooling and superheat. Systems with TXV ap- plication should have a subcooling of 11 ± 2 ºF and su- perheat of 9 ± 1 ºF.

a.If subcooling and superheat are low, adjust TXV to 9 ± 1 ºF superheat, then check subcooling.

NOTE: To adjust superheat, turn the valve stem clock- wise to increase and counter clockwise to decrease.

b.If subcooling is low and superheat is high, add charge to raise subcooling to 11 ± 2ºF then check superheat.

c.If subcooling and superheat are high, adjust TXV valve to 9 ± 1 ºF superheat, then check subcooling.

d.If subcooling is high and superheat is low, adjust TXV valve to 9 ± 1 ºF superheat and remove charge to lower the subcooling to 11 ± 2ºF.

NOTE: Do NOT adjust the charge based on suction pres- sure unless there is a gross undercharge.

4.Disconnect manifold set, installation is complete. Subcooling Formula = Sat. Liquid Temp. - Liquid Line Temp.

NOTE: Check the Schrader ports for leaks and tighten valve cores if necessary. Install caps finger-tight.

NOTE: Subsequent opening and replace of the cap will require only 1/2 to 1 hex flat. See the table below for the torque required for an effective seal on the valve bonnet (1/6 turn past finger tight.

TUBING SIZE

TORQUE

(ft-lbs)

5/8

14

1 3/8

16

After closing the valve bonnet, perform a final refrigerant leak test on the valves and sweat connections. Return the room thermostat to the desired settings.

Troubleshooting

Qualified Installer/Servicer Only

When troubleshooting, the first step should always be to check for clean coils, clean filter(s), and proper airflow. Indoor airflow should be 375 to 425 CFM per ton of cooling based on the size of the outdoor unit. The most common way of establishing indoor airflow is heating temperature rise. Indoor airflow will then be (Heating output of equipment) / (1.1 x temp. rise). In other cases, measurement of external static pressure is help- ful. For details, see the Installation Instructions for your indoor unit.

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Contents Codes & Regulations Important Safety InstructionsImportant Note to the Owner Regarding Product Warranty Shipping InspectionRefrigerant Lines Installation ClearancesRooftop Installations Safe Refrigerant HandlingBurying Refrigerant Lines Refrigerant Line Connections Leak Testing Nitrogen or Nitrogen-TracedSystem Evacuation No Leaks Electrical ConnectionsLow Voltage Connections Three Phase Compressor RotationOvercurrent Protection High Voltage ConnectionsCharge Verification Final Charge AdjustmentSaturated Suction Pressure Temperature Chart Expansion Valve System Fixed OrificeCooling Troubleshooting InformationThis page Intentionally Left Blank Split Systems Or death Condensing AC UnitRigging Suct Liq Cond Unit Refrigerant Line Length ft 25-49 50-74 TonsRefrigerant Line Connections Minimum Circuit Ampacity MCA 208/230V 197 253 460V 414 506Single State LOW Voltage HOOK-UP Ft-lbs TroubleshootingWiring Diagram Troubleshooting Analysis Table

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.

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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.