Heat Controller A-VMH27TC-1, A-VMH36QC-1, A-VMH18DC-1 Current protection of compressor ODU P3

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Service Manual	VMH Series	Heat Controller, Inc.

9.3.2.8 Current protection of compressor (ODU P3)

Current protection of compressor

Check whether the input

current of the power supply

wire is more than 12.5A

(For 27K, it is 14.5A, For

36K, it is 20A)

Yes

Check whether the

refrigerant system is ok

Check whether the

outdoor ambient

temperature is higher than

122.4°F (50°C)? No

Check whether the outdoor unit’s airflow is obstructed

Check whether the heat

exchanger is dirty

Is the refrigerant circuit blocked?

Replace outdoor main

board, and check

whether the system can

run normally

Replace the electrical

control box


Yes			Stop the unit
Yes			Stop the unit

Yes Remove all obstructions for proper ventilation


Yes			Clean the heat exchanger
Yes			Clean the heat exchanger

			Evacuate the refrigerant, then use
			high pressure nitrogen or refrigerant
Yes			high pressure nitrogen or refrigerant
Yes			to blow pipe, vacuum and recharge
			to blow pipe, vacuum and recharge
			with refrigerant again

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Contents Inverter Flex Multi-Zone Ductless Mini Split Contents General information of Outdoor Units ．Features Dimensions VMH27TC-1 VMH18DC-1VMH36QC-1 Refrigeration Cycle Diagram Indoor Outdoor Indoor units combination Wrench torque sheet for installation Connecting the cablesPipe length and elevation 30100ft 45150ft 60200ftInstallation for the first time Air purging with vacuum pumpAir purging by refrigerant Procedure Procedure Adding the refrigerant if the pipe length 5m16.5ftAdding the refrigerant due to loss of charge Collecting the refrigerant into the outdoor unit Procedure Replacing the indoor unitAir purging by the refrigerant Procedure Evacuation for the whole system Procedure Replacing the outdoor unitRefrigerant charging Procedure Abbreviations Electric control working environmentOutdoor unit’s digital display Outdoor unit point check functionFrequency of compressor Protection Low voltage protectionHeating mode Cooling modeCompressor current limit protection Indoor / outdoor units communication protection High condenser coil temp. protectionOutdoor unit anti-freezing protection Oil return Running rulesIndoor Mini-Split error code explanations Indoor Ceiling Cassette error codes2Outdoor unit error code explanation 3Trouble shooting See a VMH Series Zero-crossing signal error Indoor fan speed has been out of controlDC fan motorIndoor fan speed has been out of controlAC fan motor Open or short circuit of temperature sensor Full-water malfunction For Ceiling CassetteOutdoor temp. too low protectionOptional for some models 2 1 Outdoor Eeprom malfunction ODU E0Voltage protection ODU E5 VMH Series Temperature protection of compressor discharge ODU P0 Check whether the wiringTemperature protection of compressor top ODU P0 High pressure protection ODU P1 Only for A-VMH36QC-1 Low pressure protection ODU P2 Only for A-VMH36QC-1 Find the leak by charging nitrogen or refrigerantCurrent protection of compressor ODU P3 IPM module compressor ODU P4 Yes NoHigh temperature protection of condenser ODU P6 High PFC module protection ODU P6 Only for A-VMH36QC-1 Inverter compressor drive protection ODU P7Ohm Appendix Appendix VMH Series Position Resistance Value YDK70-6FB YDK180-8GB YSK27-4G YSK68-4B 10-2012

A-VMH18DC-1, A-VMH36QC-1, A-VMH27TC-1 specifications

The Heat Controller A-VMH series, consisting of models A-VMH27TC-1, A-VMH36QC-1, and A-VMH18DC-1, represents a sophisticated range of advanced heating and cooling systems designed for residential and commercial applications. These units are engineered to provide efficient climate control, ensuring optimal comfort throughout the year.

One of the standout features of the A-VMH series is its energy efficiency. With advanced inverter technology, these units adjust their power consumption based on the heating or cooling demand, ensuring minimal energy wastage. This not only contributes to lower energy bills but also reduces the carbon footprint, making these systems an environmentally friendly choice.

Each model in the A-VMH series comes equipped with a multi-stage filtration system designed to improve indoor air quality. The filters capture dust, allergens, and other particulate matter, ensuring that the air circulated through the living spaces is clean and fresh. This is particularly beneficial for households with allergy sufferers or respiratory issues.

The A-VMH27TC-1 model stands out for its compact design, making it ideal for smaller spaces without compromising on performance. It offers a cooling capacity of 27,000 BTU and is perfect for apartments or cozy living areas. The A-VMH36QC-1, on the other hand, provides a robust 36,000 BTU cooling capacity, making it suitable for larger rooms or commercial spaces. Its advanced heat pump technology allows for efficient heating even in colder climates. Lastly, the A-VMH18DC-1 model balances functionality and space-saving design, providing 18,000 BTUs for medium-sized areas.

All models are equipped with smart connectivity options, allowing users to control the temperature settings, adjust modes, and monitor energy consumption through mobile apps or smart home systems. This modern convenience provides users with the flexibility to maintain comfort according to their schedules and preferences.

Durability is also a hallmark of the A-VMH series. Each unit is built with high-quality materials and components, ensuring longevity and reliable performance. Moreover, the whisper-quiet operation of these units enhances the overall comfort, allowing users to enjoy their spaces without disruptive noise.

In summary, the Heat Controller A-VMH27TC-1, A-VMH36QC-1, and A-VMH18DC-1 are ideal choices for anyone seeking efficient, reliable, and smart climate control solutions. With their combination of energy efficiency, advanced filtration, smart capabilities, and robust design, these units meet the diverse needs of modern living and ensure lasting comfort in any environment.