Friedrich R-410A service manual Single Phase Resistance Test, Ground Test

Page 25

Single Phase Resistance Test

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.Defective capacitors.

24

Page 24 Page 26
Image 25
Page 24 Page 26
Contents Volt EQ08M11A Volt XQ05M10A, XQ06M10A, XQ08M10A, XQ10M10ATable Of Contents Your safety and the safety of others are very important Important Safety InformationRefrigeration System Hazards Property Damage Hazards Introduction6th Digit Voltage 7th Digit Options 0 = Straight Cool5th Digit 00001Electrical Ratings Performance DataFire Hazard Electric Shock HazardMake sure the wiring is adequate for your unit How to operate the Friedrich room air conditioner XQ models How to use the remote control XQ models Electronic Control Sequence of Operation Operating Sequence / Characteristics and FeaturesSmart FAN Mechanical Components Functional Component DefinitionsElectrical Components Hermetic ComponentsTesting the Electronic Control Boards for XQ Models Components TestingError Code Listings Activating Test ModeEQ08 System Control Switch Test EQ08 System Control Switch TestThermostat Adjustment TestCapacitor Check with Capacitor Analyzer CapacitorsCapacitor Connections FAN MotorHeating Element Testing the Heating Element Electric Shock HazardDrain PAN Valve Refrigeration Sequence of Operation Refrigeration system under high pressure 410A Sealed System Repair ConsiderationsEquipment Required 410A Sealed Refrigeration System RepairsEquipment Must be Capable Risk of Electric ShockBurn Hazard Method Of Charging / RepairsFreeze Hazard Overcharged Refrigerant Systems Undercharged Refrigerant SystemsRestricted Refrigerant System Compressor Checks Ground Test Single Phase Resistance TestRecommended procedure for compressor replacement Compressor ReplacementHigh Temperatures Explosion HazardRotary Compressor Special Troubleshooting and Service Routine Maintenance Front Cover Sleeve / DrainClearances Date Model Serial Room AIR Conditioner Unit Performance Test Data SheetProblem Possible Cause Possible Solution General Troubleshooting TipsGeneral Troubleshooting Tips Problem Possible Cause Action Cooling only Room AIR Conditioners Troubleshooting TipsReplace fuse, reset breaker. If repeats, check Fused separately Problem Possible Cause Action Heat / Cool only Room AIR Conditioners Troubleshooting Tips Electronic Control Cool only Models Page Aham PUB. NO. RAC-1 Heat Gain from Quantity Factors Cooling Load Estimate FormDAY Heat Load Form Following is an example using the heat load formInfiltration Windows & Doors AVG Windows & Doors Area, sq. ftRoom AIR Conditioners Limited Warranty Technical Support Contact Information Page Friedrich AIR Conditioning CO
Related manuals
Manual 32 pages 34.87 Kb Manual 16 pages 9.01 Kb Manual 32 pages 56.71 Kb Manual 87 pages 18.35 Kb

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.
Top Page Image Contents