To Next PageTo Next PageHow to fix low head pressure on Goodman CONDENSING AC UNIT?
Low head pressure in your Goodman Air Conditioner can be caused by: * The system being low on refrigerant. Charge the system until the sight glass is clear of bubbles. * Broken compressor valves. Replace the compressor.
What to do if my Goodman Air Conditioner compressor will not start?
If your Goodman Air Conditioner's compressor won't start, check the following: * Ensure the disconnect switch is closed. * Inspect and replace any blown fuses at the disconnect switch, after identifying the cause of the failure. * Adjust the thermostat to a lower temperature setting. * Turn the selector switch knob to the "Cool" position. * Replace any burned-out contactor or relay coils. * Inspect and secure all electrical connections.
Why does my Goodman CONDENSING AC UNIT Air Conditioner have high head pressure?
High head pressure in your Goodman Air Conditioner can be due to several reasons: * An excessive charge of refrigerant in the system. If this is the case, purge the excessive charge. * An inadequate supply of air across the condenser coil. Ensure the coil is not fouled. * Non-condensate gases in the system. Purge these gases from the system. * If necessary, recharge the system.
Why is the suction pressure low on my Goodman CONDENSING AC UNIT Air Conditioner?
Low suction pressure in your Goodman Air Conditioner can occur due to: * A closed liquid line valve. Open the liquid line valve. * A restricted liquid line. Replace the liquid line. * The bulb of the thermal expansion valve has lost its charge. Detach the bulb from the suction line and hold in hand. * The system being low on refrigerant. Add refrigerant until sight is free from bubbles, after repairing leak. * Dirty filters. Clean or replace filters. * A coil frosted up. Defrost the coil. * Flash gas in the liquid line. Check for excessive liquid line drop. * Inadequate air through the evaporator. Increase the blower speed.
What causes high suction pressure in Goodman Air Conditioner?
High suction pressure in a Goodman Air Conditioner can be caused by: * An expansion valve stuck open. Correct valve action or replace the valve. * An expansion valve bulb not in contact with the suction line. Securely fasten the bulb to the suction line. * Leaking or broken suction and/or discharge valve. Replace the compressor.
General| Brand | Goodman |
|---|---|
| Model | CONDENSING AC UNIT |
| Category | Air Conditioner |
| Language | English |
Disconnect all power before servicing. Multiple sources may be present. Failure to do so may cause injury or death.
Only individuals meeting "Entry Level Technician" requirements may use this info. Improper use may cause damage, injury or death.
Keep unit upright. Verify model, specs, electricals. Carrier responsible for shipping damage.
Installer responsible for complying with national, local codes. Manufacturer not liable for violations.
Follow EPA regulations for refrigerant handling to avoid harm and fines. Contact EPA for questions.
System must be manufacturer approved and AHRI matched. Use specified indoor model and 24 VAC thermostat.
Designed for outdoor use. Ensure adequate air circulation. Minimum 60" clearance to obstructions above.
Angle side adjacent to structure towards it, maintain clearance away. Corner installations discouraged.
Unit must be on a solid, level foundation. Slab should be 6" wider than unit, not integral to building foundation for sound.
Site should be within 50' below or 70' above evaporator. Minimize tubing length and bends for performance.
Ensure roof structure supports unit weight and maintains weather-tight integrity.
Consider sound/vibration transmission. Use vibration absorbing pads or springs between unit legs and roof assembly.
Secure all panels before lifting. Use spreader bars, protective material, and a central suspension point.
Refrigerants displace oxygen. Never purge in enclosed spaces. Ventilate if indoor leak suspected. Avoid contact with cold liquid.
Never apply flame/steam to cylinders. Heat in warm water if needed. Do not overfill or mix refrigerants. Store in cool, dry place.
Use returnable cylinders, free of damage. Ensure hydrostatic test date is not over 5 years and pressure rating is adequate.
Equip evaporator with TXV and liquid line with solenoid. Install solenoid near evaporator to prevent migration.
Use refrigerant grade copper tubing. Cut square, clean, and plug ends. Avoid contact with building elements; use vibration absorbing material.
Insulate suction line to prevent condensation. Use 3/8" minimum wall thickness; 1/2" may be needed in humid areas.
Drain residual oil. Pitch horizontal suction lines 1/2" per 10' toward condensing unit for oil return.
Field-install sight glass/moisture indicator on liquid line near service valve.
Insulate lines separately, enclose in waterproof material, and seal ends. Protect lines passing under concrete slabs.
Remove holding charge. Wrap valves with wet rag or heat trap. Use 2% silver alloy, no flux. Sweep with nitrogen.
Quench joints with water. Ensure filter drier paint is intact; repaint if burned/chipped. Avoid kinking/denting lines.
Use dry nitrogen and soapy water. Never use oxygen, high-pressure air, or flammable gases. Ensure pressure regulator and relief valve.
Close valves. Connect vacuum pump (250 micron). Evacuate to 250 microns or less using both valves. Hold vacuum.
Disconnect power before servicing. Multiple sources may be present. Failure to do so may cause injury, death or damage.
Wiring must conform to NEC/CEC and local codes. Use copper conductors. Undersized wires may cause damage or fire.
Unit is three-phase. Do not operate on single-phase. Supply voltage must agree with unit rating plate.
Supply voltage can be unbalanced within 2% phase-to-phase. Formula provided to determine percentage of unbalance.
Approved devices include time delay fuses and HACR type circuit breakers for motor-compressor starting.
Run line voltage wiring in conduit from disconnect box to unit. Use appropriate size conduit and flexible conduit if permitted.
Verify rotation by checking suction pressure drop and discharge pressure rise. Reverse if necessary.
Requires two-conductor low voltage from thermostat. Use 18 AWG minimum. Connections made in control box using solderless connectors.
Never operate compressor with suction valve closed. This can cause damage and void warranty.
Do not overcharge or operate in vacuum/negative pressure. Failure to follow procedures may cause injury or death.
Use AHRI certified refrigerant. Used refrigerant may damage compressor and is not covered under warranty.
Violation of EPA regulations may result in fines or other penalties.
Operating compressor with suction valve closed may cause serious compressor damage.
Outdoor temp must be 60°F+. Set thermostat to COOL, fan to AUTO, temp control below room temp.
Check subcooling (11±2°F) and superheat (9±1°F). Adjust TXV or charge as needed based on readings.
Torque valve bonnets 1/6 turn past finger tight for an effective seal. Tighten Schrader ports if necessary.
First step is to check clean coils, filters, and proper airflow. Indoor airflow should be 375-425 CFM per ton.
Disconnect all power before servicing or installing. Multiple power sources may be present. Failure to do so may cause injury or death.
