ELECTRICAL TROUBLESHOOTING CHART - COOLING

24K BTU

NO COOLING OPERATION

Compressor and outdoor fan motor run but indoor blower does not run

Yes

Indoor blower runs but outdoor fan motor and compressor do not run

Yes

Insure that Fuses

are good and/or that Circuit Breakers are

on and voltage is 208/230

O.K.

 

 

Set thermostat to

 

 

 

"Cool," move the Temp.

 

 

 

lever below the present

 

 

 

Room Temp.

 

 

 

 

 

 

 

 

 

 

O.K.

 

 

 

 

 

 

 

 

 

Compressor outdoor

 

 

 

 

fan motor and indoor

 

 

 

 

 

 

No

blower should now

 

 

 

 

operate

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

See Refrigerant Circuit

 

 

 

diagnosis if unit still is

 

 

 

not cooling properly

 

 

 

 

 

 

 

Before continuing

check for Error

Codes, see

electronics control

diagnostics on

page 16

Nothing operates, entire system appears dead

 

 

 

No

Yes

 

 

 

Line voltage present at the Transformer Primary

Yes

24 Volts at

“R” Terminal on board

Yes

24 Volts present at Y terminals on t-stat and board?

Yes

No

No

No

Check Supply Circuit’s jumper at transformer. If okay, replace board

Problems indicated with

Control Transformer replace board

Problems indicated with Room Thermostat or Control Wiring. Fix.

24V at t-stat and

control wiring?

Yes

Is Line Voltage present at Motor Leads?

Yes

Check Capacitor, is Capacitor Good?

Yes

Motor should run

No

No

No

No

Defective t-stat

defective control wiring

or transformer

Problems indicated

in Blower Relay of board

Replace Capacitor

Possible motor problem indicated. Check motor thoroughly

Supply Circuit problems, loose Connections, or bad Relays/Board

Replace Capacitor

and/or Start Assist

Device

3 minute delay done

 

 

 

 

 

 

 

on control board?

No

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

208/230 Volts present

 

 

 

at compressor’s relay

 

 

 

No

 

on control board?

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

Is compressor/fan

 

 

 

 

motor contactor

 

 

 

 

No

 

 

closed?

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

Are wiring,

 

 

 

 

connections, and

 

 

 

 

No

 

 

capacitor good?

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is Locked Rotor

 

 

Voltage a minimum of

 

 

 

No

197 Volts?

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

Are Capacitor and (if

 

 

so equipped) Start

 

 

 

No

Assist good?

 

 

 

 

Wait until done

Replace control board

Replace contactor

Repair or replace

component

Compressor and outdoor fan motor should now operate

Yes

See Refrigerant

Circuit Diagnosis

if unit still is not

cooling properly

 

 

 

 

Yes

 

 

 

 

 

 

Allow ample time

 

Have System

 

for pressures to

No

Pressures Equalized?

 

equalize

 

 

 

 

Yes

 

 

 

 

 

 

Possible Compressor

 

 

 

 

 

 

 

 

problem indicated.

 

Compressor should

 

 

 

See Compressor

No

run

 

Checks

 

 

 

37

Page 38
Image 38
Friedrich R410A manual Electrical Troubleshooting Chart Cooling 24K BTU, Compressor outdoor

R410A specifications

Friedrich R410A is a refrigerant blend that has become a cornerstone in the HVAC industry, particularly for air conditioning systems. This hydrofluorocarbon (HFC) is known for its efficiency and environmentally friendly properties, making it a popular alternative to older refrigerants like R22.

One of the main features of R410A is its exceptional thermal efficiency. It has a higher cooling capacity compared to R22, which allows for smaller and more efficient equipment. This efficiency translates to reduced energy consumption and lower operating costs for users. Additionally, the higher pressure capability of R410A enables the design of more compact systems, which is particularly beneficial for residential and commercial applications where space is often limited.

R410A is characterized by its zero ozone depletion potential (ODP), which is a significant advantage over its predecessors. This makes it a more environmentally responsible choice, aligning with global initiatives to phase out substances that harm the ozone layer. However, it is essential to note that while R410A does not deplete the ozone, it does have a global warming potential (GWP) of approximately 2,088, making it less favorable in terms of climate impact compared to natural refrigerants.

In terms of technology, R410A is typically utilized in systems that are designed specifically for this refrigerant. Equipment compatible with R410A often features advanced components that can handle the higher pressures required. Many modern air conditioning systems equipped with R410A also incorporate variable-speed compressors and advanced electronic controls, enhancing overall performance and comfort.

Additionally, R410A systems often come equipped with variable refrigerant flow (VRF) technology, which allows for precise temperature control in multiple zones of a building. This versatility makes R410A an ideal choice for both residential and commercial installations, providing optimal comfort throughout various spaces.

In summary, Friedrich R410A stands out due to its high energy efficiency, zero ozone depletion potential, and suitability for modern HVAC technologies. As the industry moves towards more sustainable practices, R410A serves as a reliable refrigerant that balances performance with environmental responsibility. It’s a significant choice for anyone looking to invest in efficient and eco-friendly heating and cooling solutions.