High condenser coil temp. protection | Heat Controller A-VMH36QC-1

Service Manual	VMH Series	Heat Controller, Inc.

8.5.5 Indoor / outdoor units communication protection

If any indoor unit can not receive the feedback signal from the outdoor unit for 2 minutes, the AC will stop and display the failure code.

8.5.6 High condenser coil temp. protection.

When T3>149°F(T3>65°C) for 3 seconds, the compressor will stop while the indoor fan and outdoor fan will continue.

When T3<126°F(T3<52°C), the protection will release and the compressor will restart after 3 minutes.

8.5.7 Outdoor unit anti-freezing protection

When T2B<32°F(T2B<0°C) for 4 minutes, the indoor unit capacity demand will be zero and resume to normal when T2B>50°F(T2B>10°C).

8.5.8Oil return Running rules:

1.If the compressor frequency remains lower than RECOILINFRE for 2hours,the AC will increase the

frequency to RECOILFRE for 3mins and then resume to the former frequency.

Model	RECOILINFRE
A-VMH18DC-1	45
A-VMH27TC-1	45
A-VMH36QC-1	40

2.During the oil return process, the EXV and indoor units continue with the current running mode, the frequency will not be limited by the compressor discharge temp. or the current.

8.5.9Compressor preheating functions

----Preheating permitting condition:

If T4(outdoor ambient temperature) T4＜37.4°F(T4＜3°C) and newly powered on or if T4＜37.4°F(T4＜3°C) and compressor has stopped for over 3 hours, the compressor’s crank case heater will begin to operate.

----Preheating mode:

A weak current flow through the coil of compressor from the wiring terminal of compressor, heats the compressor without it operating via the crankcase heater.

----Preheating release condition:

If T4>41°(T4>5°C) or the compressor starts running, preheating function will stop.

8.5.10 Compressor crankcase heater

When T4<37.4°(T4<3°C) and the compressor is not running, the crankcase heater will be active. When T4≧41°(T4≧5°C) or the compressor starts up, the crankcase heater will stop working.

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.

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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.