TROUBLESHOOTING

Problem

Possible Cause

Possible Solution

 

Compressor attempts to start

Allow a minimum of 3 minutes to allow pressures

 

before system pressures are

 

to equalize before attempting to start.

 

equalized.

 

 

 

 

Check voltage with unit operating. Check for

 

Low or fluctuating voltage.

other appliances on the circuit. Unit should be on

 

separate circuit for proper voltage, and be fused

Compressor

 

 

separately

attempts to

 

 

Incorrect wiring

Connect per appropriate wiring diagram

start, or runs for

Shorted or incorrect capacitor

Replace capacitor

short periods

only. Cycles on

 

 

Restricted or low air flow through

 

overload.

Check motor fan blade.

condenser coil

 

 

 

Compressor running abnormally

Check for refrigerant restriction, blocked airflow,

 

loose wires at compressor terminals and fan

 

hot

 

motor capacitor voltage.

 

 

 

Overload opens too soon.

Change compressor if all other corrections above

 

are normal.

 

 

Problem

Possible Cause

Possible Solution

 

Thermostat contacts not closing.

Check continuity of thermostat at coldest setting. If

 

compressor runs, replace thermostat.

 

 

 

Low voltage supply.

Check for nameplate voltage. Provide proper

 

voltage.

 

 

Compressor does

Switch (On-Off) inoperative.

Test for continuity.

not start - fan

Defective capacitor.

Test with analyzer, replace if needed.

motor runs.

Compressor internal overload

Check voltage at compressor terminals. If voltage

 

open.

is satisfactory, replace compressor.

 

Solid state relay open.

Replace relay.

 

Open or shorted compressor

Check windings for continuity and resistance. If

 

windings.

open, replace compressor.

Problem

Possible Cause

Possible Solution

 

 

 

 

Thermostat open or inoperative.

Set to coldest position. Test thermostat and

 

replace if necessary.

 

 

 

Dirty air filter.

Clean as recommended in Owner’s Manual.

 

 

 

Does not cool, or

Dirty or plugged condenser or

Clean coils.

evaporator coil.

 

cools only slightly.

 

 

Poor air circulation in area being

Adjust air louvers. Check application. Check for

 

 

dirty filter or evap coil. Check fan motor. Correct as

 

cooled.

 

needed.

 

 

 

Low capacity - undercharge.

Check for leak and make necessary repairs.

 

 

 

 

 

 

 

Compressor not pumping properly.

Replace compressor.

 

 

 

NOTE: If Inside Coil Freezes Up

Your Friedrich Hazardgard is designed not to freeze with outdoor temperatures as low as 45°F (7°C). If the indoor coil should ice over while cooling, set the thermostat to the warmest position until the ice on the coil is gone. Setting the thermostat to a slightly warmer position will probably keep ice from forming on the coil. A dirty filter will contribute to icing.

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Friedrich R-410A service manual Only. Cycles on
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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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