Heat Controller A-VMH27TC-1, A-VMH18DC-1 Low pressure protection ODU P2 Only for A-VMH36QC-1

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Heat Controller, Inc.

VMH Series

Service Manual

 

 

 

9.3.2.7 Low pressure protection (ODU P2) (Only for A-VMH36QC-1)

Low pressure protection

Is the wiring between the

low pressure protector and main control board connected correctly?

Yes

Is the low pressure protector broken?

Yes

Short circuit the low

pressure protector socket, check whether the system can run normally now?

No

Check whether the refrigerant system is ok

Check whether the

outdoor ambient

temperature is to low

No

Check if there is a refrigerant leak

Connect the pressure gauge to the gauge joint of the system, check whether the pressure is lower than 0.14MPa

No

Check whether the refrigerant circuit is blocked or not

No

Replace outdoor main board

 

 

 

 

No

 

 

Reconnect it properly

 

 

 

 

 

Yes Replace low pressure protector

 

 

 

 

Yes

 

 

Stop the unit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Find the leak by charging nitrogen or refrigerant

 

 

 

 

 

 

 

 

 

into the system, if the leak is serious there will be

 

 

Yes

 

 

 

 

 

distinct “hissing” sound; if the leakage is small, use a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

soap and water mixture or electronic leak detector

 

 

 

 

 

 

 

 

 

to find the leak and repair.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Evacuate the refrigerant, then use

 

 

 

 

 

 

 

 

 

 

high pressure nitrogen or refrigerant

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

to blow out 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 VMH18DC-1 VMH27TC-1VMH36QC-1 Refrigeration Cycle Diagram Indoor Outdoor Indoor units combination 30100ft 45150ft 60200ft Wrench torque sheet for installationConnecting the cables Pipe length and elevationAir purging with vacuum pump Installation for the first timeAir purging by refrigerant Procedure Adding the refrigerant if the pipe length 5m16.5ft ProcedureAdding the refrigerant due to loss of charge Replacing the indoor unit Collecting the refrigerant into the outdoor unit ProcedureAir purging by the refrigerant Procedure Replacing the outdoor unit Evacuation for the whole system ProcedureRefrigerant charging Procedure Outdoor unit point check function AbbreviationsElectric control working environment Outdoor unit’s digital displayFrequency of compressor Low voltage protection ProtectionCooling mode Heating modeCompressor current limit protection Oil return Running rules Indoor / outdoor units communication protectionHigh condenser coil temp. protection Outdoor unit anti-freezing protectionIndoor Ceiling Cassette error codes Indoor Mini-Split error code explanations2Outdoor unit error code explanation 3Trouble shooting See a VMH Series Indoor fan speed has been out of controlDC fan motor Zero-crossing signal errorIndoor fan speed has been out of controlAC fan motor Full-water malfunction For Ceiling Cassette Open or short circuit of temperature sensor2 1 Outdoor Eeprom malfunction ODU E0 Outdoor temp. too low protectionOptional for some modelsVoltage protection ODU E5 VMH Series Check whether the wiring Temperature protection of compressor discharge ODU P0Temperature protection of compressor top ODU P0 High pressure protection ODU P1 Only for A-VMH36QC-1 Find the leak by charging nitrogen or refrigerant Low pressure protection ODU P2 Only for A-VMH36QC-1Current protection of compressor ODU P3 Yes No IPM module compressor ODU P4High temperature protection of condenser ODU P6 Inverter compressor drive protection ODU P7 High PFC module protection ODU P6 Only for A-VMH36QC-1Ohm 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.
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