Carrier 40MVC, 38MVQ, 38MVC Dry Dehumidification Mode, Manual Operation, Forced Cooling Operation

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38/40MVC, MVQ

Dry (Dehumidification) Mode

When more humidity control is desired, the Dry setting can be selected. Lower humidity is achieved when the microprocessor adjusts the indoor fan speed and compressor cycling by comparing the room temperature (T) and the set point temperature (TS).

There are two different control algorithms:

Size 9k and 12 k units:

T = TS + 3.6 - the compressor will run for 6 minutes and the indoor fan will run at low speed. The compressor will be off for 4 minutes and the indoor fan will run in ultra low speed.

TS = T < TS + 3.6 - The compressor will run for 5 minutes and the indoor fan will run at low speed. The compressor will be off for 5 minutes and the indoor fan will run in ultra low speed.

T < TS - The compressor will run for 4 minutes and the indoor fan will run at low speed. The compressor will be off for 6 minutes and the indoor fan will run in ultra low speed.

Size 18k and 24k units:

These units do not have ultra low speed. When set for dehumidification, the indoor fan runs at low speed and the compressor cycles based on the difference between T and TS.

Manual Operation

The unit can be set for Forced Auto or Forced Cooling manually by pushing the Manual button once or twice as shown below:

Push 3 Times

 

 

Push Once

 

 

Push Twice

Remote

 

 

Forced

 

 

Forced

mode

 

 

auto

 

 

cooling

A08116

Fig. 33 – Manual Operation

Forced Auto (Emergency Operation)

Forced Auto option allows operation of the unit if the remote control is lost or the batteries have expired. When the system is in Forced Auto, it will run with a default set point of 75.2_F. While in Forced Auto, the system will respond to signals from the remote control.

Forced Cooling Operation

This option is used for diagnostic purposes. The system is forced to run in cooling for 30 minutes.

After 30 minutes, the 9k and 12k systems will switch to Dry mode with a default set point of 75.2_F. The 18k and 24k systems will switch to Forced Auto mode. When the system is in Forced Cooling mode, it will not respond to signals from the remote control. The only way to exit the Forced Cooling mode is to push the manual button once to switch the system to remote control mode.

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Contents 38MVC/40MVC 38MVQ/40MVQ IntroductionModel Number Nomenclature Indoor UnitStandard Features and Accessories Specifications Cooling only Units System Model NumberCoil Specifications Heat Pump Units OutdoorService Valve Locations Clearances Indoor 53MVC/MVQ System Operating Envelope Chart System Operating EnvelopeElectrical Data Connection Diagrams Connection DiagramsWiring Diagrams Wiring Diagram 38MVC009----1 W/ 40MVC009----1Wiring Diagram 38MVC012----1 W/ 40MVC012----1 Wiring Diagram 38MVC012----3 W/ 40MVC012----3 Wiring Diagram 38MVC018----3 W/ 40MVC018----3 Wiring Diagram 38MVQ009----1 W/ 40MVQ009----1 Wiring Diagram 38MVQ012----1 W/ 40MVQ012----1 Wiring Diagram 38MVQ012----3 W/ 40MVQ012----3 Refrigeration Cycle Diagram CoolingRefrigerant Lines General refrigerant line sizingRefrigerant Charge Using Vacuum Pump System Evacuation and ChargingMinute Time Delay Control SystemSystem Safeties Compressor Overcurrent ProtectionCondenser High Temperature Protection Indoor High Temperature ProtectionSequence of Operation Indoor Coil Freeze ProtectionModes of Operation Auto Fan DefrostDry Dehumidification Mode Manual OperationForced Cooling Operation Troubleshooting Diagnostic HierarchyRequired Tools Recommended StepsChart 1 Indoor FAN Speed OUT of Control YesChart 2 Temperature Sensor Chart 3 Compressor Overcurrent Protection Chart 4 Indoor Unit Communication Error Size 9K and 12K Chart 5 Outdoor Unit Protects Chart 6 Indoor Unit Communication Error Size 18K and 24K Chart 7 Unit not RUNNING, no Diagnostic Code Chart 8 Unit not Running Optimally Chart 9 Unit not Running Optimally HP in Heating Chart 10 Compressor Chart 11 Outdoor Motor Chart 12 Reversing Valve Chart 13 Receiver BoardAppendix Table of Contents Description Number Appendix38MVC009--- --- ---1/38MVC012--- --- ---1 Control Board Input or Output Value40MVC009--- --- ---1/40MVC012--- --- ---1 Control Board 38MVQ009---1/38MVQ012--- --- ---1 Control Board38MVC012--- --- ---3 Control Board 40MVC012--- --- ---3 Control Board38MVQ012--- --- ---3 Control Board 40MVQ012--- --- ---3 Control Board38MVC018--- --- ---3 Control Board Control BoardA6 Characteristics of Temperature Sensor Temp. ˚F/˚C Resistance KΩ9K & 12K Units 18K & 24K UnitsCatalog No.38---40MV---1SM
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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.