CHART 3 - COMPRESSOR OVERCURRENT PROTECTION

38/40MVC, MVQ

Replace compressor

No

Is unit running in outdoor

 

Beyond operating range

ambient higher than

 

 

 

125 °F?

 

 

No

 

 

 

No

Clean coil.

Outdoor coil clean?

 

 

Problem persists?

 

 

Yes

 

Yes

Check connections from

Yes

Clean/repair connection

OD board. Corrosion, or

 

 

Problem persists?

high resistance

 

 

 

No

 

Yes

 

No

 

Outdoor fan Ok?

 

Change outdoor motor

Yes

 

 

Connect gauges to unit.

No

 

 

High head, high suction?

pressures ok?

 

 

 

Yes

 

Yes

Check amp draw to

 

Unit is overcharged.

compressor? Values within

 

Reclaim charge and weigh

range?

 

in correct charge.

No

No

No

Problem solved

Problem solved

High head, low suction?

Yes

Restriction in refrigeration circuit.

Yes

Replace outdoor board

A08168

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Carrier 40MVC, 38MVQ, 38MVC, 40MVQ service manual Chart 3 Compressor Overcurrent Protection

40MVQ, 40MVC, 38MVQ, 38MVC specifications

The Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ are advanced air-conditioning systems designed for both residential and commercial applications. These units are recognizable for their commitment to efficiency, reliability, and comfort, making them ideal choices for various environments.

One of the standout features of these models is their high energy efficiency ratings. Both the 38MVC and 38MVQ boast Seasonal Energy Efficiency Ratios (SEER) that exceed industry standards, delivering substantial energy savings over time. The 40MVC and 40MVQ models also continue this trend, featuring enhanced efficiency that translates into lower utility bills and a reduced carbon footprint.

These air-conditioning units utilize Carrier's innovative inverter technology, which allows for variable speed operation. This means that the compressor can adjust its speed according to the cooling demand, resulting in smoother temperature control and less energy consumption. The inverter technology not only maximizes comfort but also contributes to quieter operation, as the systems can run at lower speeds when full capacity is not required.

In addition to efficiency, the Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ are equipped with advanced filtration systems. These systems work to purify the air by reducing allergens and pollutants, ensuring a healthier indoor environment. Some models also come equipped with smart connectivity options, allowing users to control their air conditioning remotely via a smartphone app. This feature adds convenience and helps monitor energy usage effectively.

With durable construction and high-quality components, these units are designed to withstand the test of time, reducing the need for frequent repairs or replacements. They are also built to operate quietly, so they can provide comfort without disturbing the peace of the indoor environment.

In terms of installation flexibility, the Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ can be easily integrated into various existing HVAC systems, thanks to their compatible size and design. This adaptability makes them suitable for a wide range of applications, from small residential homes to larger commercial spaces.

Overall, the Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ models are engineered with cutting-edge technologies that prioritize efficiency, comfort, and ease of use, making them an excellent choice for those looking to enhance their indoor climate control solutions.