COMPONENTS TESTING (CONTINUED)

HEATER ELEMENTS AND LIMIT SWITCHES’ SPECIFICATIONS

All heat pumps and electric heat models are equipped with a heating element and a limit switch (bimetal ther- mostat). The limit is in series with the element and will interrupt the power at a designed temperature.

Should the blower motor fail, fiLTER become clogged or air- flOW be restricted etc., the high limit switch will open and interrupt the power to the heater before reaching an un- safe temperature condition.

VPAK 9K, 12K and 18K BTUs Models:

2.5KW, 230 V, Resistance 18.61 Ohms + - 5%. Has 1 Limit Switch, Opens at 120° F, Closes at 90° F, It has a One Time Open Temp. of 145° F.

3.4KW, 230 V, Resistance 13.68 Ohms + - 5%. Has 1 Limit Switch, Opens at 120° F, Closes at 90° F, It has a One Time Open Temp. of 145° F.

5 KW, 230 V, Resistance 9.31 Ohms + - 5%.

Has 1 Limit Switch, Opens at 130° F, Closes at 100° F, It has a One Time Open Temp. of 155° F.

VPAK 24K BTUs Models:

2.5KW, 230 V, Resistance 18.61 Ohms + - 5%. Has 2 Limit Switches, Primary Opens at 155° F, Closes at 125° F, Secondary’s Open Temp. is 200° F.

3.4KW, 230 V, Resistance 13.68 Ohms + - 5%. Has 2 Limit Switches, Primary Opens at 155° F, Closes at 125° F, Secondary’s Open Temp. is 200° F.

5 KW, 230 V, Resistance 9.31 Ohms + - 5%. Has 2 Limit Switches, Primary Opens at 155° F, Closes at 125° F, Secondary’s Open Temp. is 200° F.

7.5KW, 230 V (composed of 2, 3.7 KW Elements) Each Has a Resistance of 12.41 Ohms + - 5%. Each Has 2 Limit Switches, Primary Opens at 165° F, Closes at 135° F With a 1 time Open Temp. of 210° F. Secondary Limit’s Open Temp. is 200° F.

10 KW, 230 V (composed of 2, 5 KW Elements) Each Has a Resistance of 9.31 Ohms + - 5%.

Each Has 2 Limit Switches, Primary Opens at 165° F, Closes at 135° F With a 1 time Open Temp. of 210° F. Secondary Limit’s Open Temp. is 200° F.

NOTE: Always replace with an exact replacement.

TESTING THE HEATING ELEMENTS AND LIMIT SWITCHES

WARNING

ELECTRIC SHOCK HAZARD

Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death.

Testing of the heating elements can be made with an ohmmeter or continuity tester across the terminals after the power wires have been removed. Test the limit switch for continuity across its input and output terminals.Test below the limit switch’s reset temperature.

DRAIN PAN VALVE

During the cooling mode of operation, condensate which collects in the drain pan is picked up by the condenser fan blade and sprayed onto the condenser coil. This assists in cooling the refrigerant plus evaporating the water.

During the heating mode of operation, it is necessary that water be removed to prevent it from freezing during cold outside temperatures. This could cause the condenser fan blade to freeze in the accumulated water and prevent it from turning.

To provide a means of draining this water, a bellows type drain valve is installed over a drain opening in the base pan.

This valve is temperature sensitive and will open when the outside temperature reaches 40°F. The valve will close gradually as the temperature rises above 40°F to fully close at 60°F.

Bellows Assembly

Drain Pan Valve

If outdoor temperature is at 40° F and drain valve does not open, replace it. (Ensure it is not restricted by debris).

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Friedrich R410A manual Heater Elements and Limit SWITCHES’ Specifications, Drain PAN Valve
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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.
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