Friedrich R-410A Single Phase Resistance Test, Ground Test, Checking Compressor Efficiency

Page 48

Single Phase Resistance Test

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or installation. Extreme care must be used, if it becomes necessary to work on equipment with power applied.

Failure to do so could result in serious injury or death.

Remove the leads from the compressor terminals and set the ohmmeter on the lowest scale (R x 1).

Touch the leads of the ohmmeter from terminals common to start (“C” to “S”). Next, touch the leads of the ohmmeter from terminals common to run (“C” to “R”).

Add values “C” to “S” and “C” to “R” together and check resistance from start to run terminals (“S” to “R”). Resistance “S” to “R” should equal the total of “C” to “S” and “C” to “R.”

In a single phase PSC compressor motor, the highest value will be from the start to the run connections (“S” to “R”). The next highest resistance is from the start to the common connections (“S” to “C”). The lowest resistance is from the run to common. (“C” to “R”) Before replacing a compressor, check to be sure it is defective.

GROUND TEST

Use an ohmmeter set on its highest scale. Touch one lead to the compressor body (clean point of contact as a good connection is a must) and the other probe in turn to each compressor terminal. If a reading is obtained the compressor is grounded and must be replaced.

Check the complete electrical system to the compressor and compressor internal electrical system, check to be certain that compressor is not out on internal overload.

Complete evaluation of the system must be made whenever you suspect the compressor is defective. If the compressor has been operating for sometime, a careful examination must be made to determine why the compressor failed.

Many compressor failures are caused by the following conditions:

1.Improper air flow over the evaporator.

2.Overcharged refrigerant system causing liquid to be returned to the compressor.

3.Restricted refrigerant system.

4.Lack of lubrication.

5.Liquid refrigerant returning to compressor causing oil to be washed out of bearings.

6.Noncondensables such as air and moisture in the system. Moisture is extremely destructive to a refrigerant system.

7.Capacitor (see page 34).

CHECKING COMPRESSOR EFFICIENCY

The reason for compressor inefficiency is normally due to broken or damaged suction and/or discharge valves, reducing the ability of the compressor to pump refrigerant gas.

WARNING

HIGH PRESSURE HAZARD

Sealed Refrigeration System contains refrigerant and oil under high pressure.

Proper safety procedures must be followed, and proper protective clothing must be worn when working with refrigerants.

Failure to follow these procedures could result in serious injury or death.

This condition can be checked as follows:

1.Install a piercing valve on the suction and discharge or liquid process tube.

2.Attach gauges to the high and low sides of the system- .

3.Start the system and run a “cooling or heating perfor mance test.” If test shows:

A.Below normal high side pressure

B.Above normal low side pressure

C.Low temperature difference across coil

The compressor valves are faulty - replace the compressor.

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Contents Cool Only Cool with Electric HeatHeat Pump with Electric Heat Heat Pump Volt YS10M10Table Of Contents Important Safety Information Your safety and the safety of others are very importantRefrigeration System Repair Hazards Property Damage Hazards Introduction Model and Serial Number LocationUnit Identification Specifications Performance DataInstallation Information / Sleeve Dimensions Electrical Data Electric Shock HazardFire Hazard Make sure the wiring is adequate for your unit Control Panel Operation Special Functions System Exit Back FAN Mode Speed Display Schedule Enter Digital Control Panels Access Codes Summary Key Sequence ActionRemote Control Operation Remote Control Operation Electronic Control System Maintenance IntroductionElectronic Control System Maintenance Operation Test mode Bypasses Following functions Can be TestedTo Clear Error Codes’ History Factory USE onlyUnit Operation Front PanelCOOL-HEAT SET Points System Set Point Mapping FigureElectronic Control Sequence of Operation Compressor OperationHeating Mode Control Operation Heat Control Heat Pump OnlyHeat Pump With Electric Heat Operation ConditionElectric Heat Operation in Cool with Electric Heat Units Compressor Lock Out Time Fan Mapping During Heat Mode Unit Operation with a WALL-STATRemoving the Front Cover Replacing the Indoor Coil Thermistor Swing OutConnecting a Remote Wall Thermostat Remote Wall Thermostat Location Components Testing CapacitorsCapacitor Check with Capacitor Analyzer Capacitor ConnectionsTesting the Heating Element Electric Shock Hazard Heating ElementHeating Element Heat Pump Models Drain PAN ValveRefrigeration Sequence of Operation 410A Sealed System Repair Considerations Refrigeration system under high pressure410A Sealed Refrigeration System Repairs Equipment RequiredEquipment Must be Capable Risk of Electric ShockMethod Of Charging / Repairs Burn HazardFreeze Hazard Undercharged Refrigerant Systems Overcharged Refrigerant SystemsRestricted Refrigerant System Hermetic Components Check Metering DeviceCheck Valve Capillary Tube SystemsReversing Valve DESCRIPTION/OPERATION Testing the Reversing Valve Solenoid Coil Reversing Valve in Heating ModeChecking the Reversing Valve Procedure For Changing Reversing Valve Touch Test in Heating/Cooling CycleExplosion Hazard Compressor Checks Single Phase Resistance Test Ground TestChecking Compressor Efficiency Compressor Replacement Recommended procedure for compressor replacementHigh Temperatures High Pressure Hazard Routine Maintenance Sleeve / Drain Decorative Front CoverClearances Standard Filter Cleaning Installation Instructions Control Panel Battery Change Procedure Battery type Lithium, 3 Volts, #CR2450Service and Assistance Room AIR Conditioner Unit Performance Test Data Sheet Error Codes and Alarm Status IconTroubleshooting Tips Problem Possible Cause Possible SolutionTroubleshooting Tips Cooling only Room AIR Conditioners Troubleshooting Tips Problem Possible Cause Possible SolutionReplace fuse, reset breaker. If repeats, check Possible Cause Possible Solution Problem Possible Cause Possible Solution Heat / Cool only Room AIR Conditioners Troubleshooting Tips Bad outdoor coil thermistor Replace thermistorHeat Pump Room AIR Conditioners Trouble Shooting Tips Troubleshooting Chart Heat PumpProblem Possible Cause Action Electrical Troubleshooting Chart Heat Pump System Cools When Heating is DesiredHeat Pump YESNormal Function of Valve Malfunction of ValveElectronic Control Board Components Identification DischargeRemote Wall Thermostat Wiring Diagrams Cool W/O Electric HeatSchematic Kuhl Electronic Control Cool only ModelsSL28M30A, SL36M30A KUHL+ Electronic Control Cool with Electric Heat Models ES12M33A, ES15M33A EM18M34A, EM24M34AKUHL+ Electronic Control Cool with Electric Heat Model EL36M35AKUHL+ Electronic Control Heat Pump only Model YS10M10AHeat KUHL+ Electronic Control Heat Pump with Electric Heat Model YL24M35ATHERMISTORS’ Resistance Values This Table Applies to All ThermistorsReplacement Remote Control Configuration Instructions Checking the Remote Control’s OPT # Code Replacement Instructions Aham PUB. NO. RAC-1 Cooling Load Estimate Form Heat Gain from Quantity FactorsDAY Following is an example using the heat load form Heat Load FormHeating Load Form Friedrich Room Unit Heat Pumps Windows & Doors Area, sq. ftInfiltration Windows & Doors AVG Room AIR Conditioners Limited Warranty Technical Support Contact Information Friedrich AIR Conditioning CO
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R-410A specifications

Friedrich R-410A is an advanced refrigerant widely used in HVAC (Heating, Ventilation, and Air Conditioning) systems, known for its high efficiency and environmental friendliness. As a hydrofluorocarbon (HFC) blend, R-410A has become the preferred alternative to R-22, which is being phased out due to its ozone-depleting potential. One of the main features of R-410A is its high latent heat of vaporization, which allows for efficient heat transfer and improved cooling performance in air conditioning units.

Technologically, R-410A operates at higher pressures than older refrigerants, meaning systems designed for R-410A need to be built with more robust components to safely handle these pressures. This results in a more compact system design that offers enhanced performance and reliability. The dual-component nature of R-410A—composed of difluoromethane (R-32) and pentafluoroethane (R-125)—provides an optimal balance of thermodynamic properties, leading to superior energy efficiency, especially in variable speed applications.

In terms of characteristics, R-410A has a higher cooling capacity, which enables HVAC systems to effectively cool larger spaces or run more efficiently when cooling smaller areas. The refrigerant is non-toxic and non-flammable, which enhances safety during its use. In addition, R-410A has a lower global warming potential relative to other refrigerants, making it a more environmentally responsible choice for modern cooling systems.

Moreover, R-410A systems typically require less refrigerant charge due to their efficiency, contributing to reduced greenhouse gas emissions. The adoption of R-410A aligns with regulatory trends aimed at minimizing the environmental impact of refrigerants in cooling applications.

Overall, the Friedrich R-410A refrigerant embodies a combination of technology and environmental stewardship, making it a cornerstone of contemporary HVAC design. Its ability to provide effective and energy-efficient cooling solutions while being compliant with modern environmental regulations positions R-410A as the refrigerant of choice for engineers and installers focused on sustainability and performance in air conditioning systems.
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