ELECTRONIC CONTROL BOARD COMPONENTS IDENTIFICATION AND TESTING (Continued) (See wiring diagrams pages 41-46)

Front

VPAK 24K

Back

High Pressure Switch

 

 

Reversing Valve

Not Used

Not Used

High Speed

Not Used

Low Speed

Diagnostic

Service Module

Not Used

T-stat Terminals

Not Used

(Blue)

(Green)

Not Used

Transformer

115/230 Volts

FP F2 F1 D2 D1 C GH GL B Y W R

Low Voltage Interface Connection

Transformer voltage Selector Switch 115/230 Volts Ensure it is set at 230VAC

Sample board for Kuhl+ unit

Fuse 10 Amps

250 VaC

1.Test for power at L1 and L2 for 208/230 VAC. (Ensure the transformer voltage selector switch is set for 230 VAC)

2.Test the 10 amp/250 VAC fuse for continuity.

FOR THE FOLLOWING TESTS, ENSURE THE UNIT IS IN THE APPROPRIATE SETTINGS FOR THE TEST BEING PERFORMED. ENSURE THERE ARE NO ERROR CODES ACTIVE.

3.Testing the compressor relay and heat relays:

Test for power in and power out. If there is power in and no power out, replace the electronic control board. (208/230 to L2)

4.Testing the fan and reversing valve relays:

Test for power at the reversing valve and fan relays 1 or 3. (208/230 to L2)

5.Testing the transformer:

Test the low voltage terminal strip at: R and C for 24 VAC

F2 and F1 for 24 VAC

D2 and D1 for 24 VAC

Test the service module connector for 5 VDC (see prior page) Test the connectors for the thermistors for up to 5 VDC

If there is no voltage at any of the above, replace electronic control board.

6.Testing the thermistors:

Disconnect the thermistor and test for resistance value (see page 35)

7.Testing the high pressure switch (VPAK 24K only)

Test for 24 VAC at board, if there is no voltage, replace the electronic control.

Test the pressure switch for continuity, if none, replace it (switch is normally closed)

18

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Image 19
Friedrich R410A manual Fuse 10 Amps 250 VaC

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.