COMFORTNET™ SYSTEM

COMFORTNET™ SYSTEM

OVERVIEW

The ComfortNet system (or CT system) is a system that in- cludes a ComfortNet compatible furnace and air conditioner or heat pump with a CTK01AA thermostat. A valid ComfortNet system could also be a compatible furnace, CTK01AA thermo- stat and non-compatible, single stage air conditioner. Any other system configurations are considered invalid ComfortNet sys- tems and must be connected as a traditional (or legacy) sys- tem (see Electrical Connections for wiring connections). The table below compares the valid CT systems.

CT compatible

CT compatible

Full CT system

Furnace

Air Conditioner

benefits and features

 

 

 

CT compatible

CT compatible

Full CT system

Furnace

Heat Pump

benefits and features

CT compatible

Non-CT compatible

CT system

Single Stage

benefits and features

Furnace

Air Conditioner

for furnace only

 

 

 

 

A ComfortNet heating/air conditioning system differs from a legacy/traditional system in the manner in which the indoor unit, outdoor unit and thermostat interact with one another. In a traditional system, the thermostat sends commands to the indoor and outdoor units via analog 24 VAC signals. It is a one- way communication path in that the indoor and outdoor units typically do not return information to the thermostat.

On the other hand, the indoor unit, outdoor unit, and thermo- stat comprising a ComfortNet system “communicate” digitally with one another. It is now a two-way communications path. The thermostat still sends commands to the indoor and out- door units. However, the thermostat may also request and receive information from both the indoor and outdoor units. This information may be displayed on the CT thermostat. The in- door and outdoor units also interact with one another. The outdoor unit may send commands to or request information from the indoor unit. This two-way digital communications be- tween the thermostat and subsystems (indoor/outdoor unit) and between subsystems is the key to unlocking the benefits and features of the ComfortNet system.

Two-way digital communications is accomplished using only two wires. The thermostat and subsystem controls are power with 24 VAC. Thus, a maximum of 4 wires between the equip- ment and thermostat is all that is required to operate the sys- tem.

AIRFLOW CONSIDERATIONS

Airflow demands are managed differently in a fully communi- cating system than they are in a legacy wired system. The system operating mode (as determined by the thermostat) determines which unit calculates the system airflow de- mand. If the indoor unit is responsible for determining the airflow demand, it calculates the demand and sends it to the

ECM motor. If the outdoor unit or thermostat is responsible for determining the demand, it calculates the demand and transmits the demand along with a fan request to the indoor unit. The indoor unit then sends the demand to the ECM motor. The table below lists the various ComfortNet sys- tems, the operating mode, and airflow demand source.

System

System

Airflow Demand

Operating Mode

Source

 

 

 

 

 

Cooling

Air Conditioner

Air Conditioner +

 

 

Heating

Furnace

Furnace

 

 

 

 

 

 

Continuous Fan

Thermostat

 

 

 

 

 

 

 

Cooling

Heat Pump

 

 

 

 

Heat Pump Heating

Heat Pump

Heat Pump +

Only

 

Furnace

 

 

Auxiliary Heating

Furnace

 

 

 

 

 

Continuous Fan

Thermostat

 

 

 

 

 

 

 

Cooling

Furnace

Furnace + Non-

 

 

 

 

Comm 1stg Air

Heating

Furnace

Conditioner

 

 

 

Continuous Fan

Thermostat

 

 

 

For example, assume the system is an air conditioner matched with a furnace. With a call for low stage cooling, the air conditioner will calculate the system’s low stage cooling airflow demand. The air conditioner will then send a fan request along with the low stage cooling airflow demand to the furnace. Once received, the furnace will send the low stage cooling airflow demand to the ECM motor. The ECM motor then delivers the low stage cooling airflow. See the applicable ComfortNet™ air conditioner or heat pump installation manual for the airflow delivered during cooling or heat pump heating.

In continuous fan mode, the CTK01AA thermostat provides the airflow demand. The thermostat may be configured for a low, medium, or high continuous fan speed. The low, medium, and high fan speeds correspond to 25%, 50%, and 75%, respectively, of the furnaces’ maximum airflow capabil- ity. During continuous fan operation, the thermostat sends a fan request along with the continuous fan demand to the furnace. The furnace, in turn, sends the demand to the ECM motor. The ECM motor delivers the requested continuous fan airflow.

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Goodman Mfg VC8 instruction manual Comfortnet System

VC8 specifications

Goodman Manufacturing has established itself as a leading provider of quality heating, ventilation, and air conditioning (HVAC) systems. Among its impressive lineup is the Goodman VC8, a versatile and efficient variable-capacity air conditioner that stands out due to its innovative design and advanced technologies.

The Goodman VC8 is known for its superior energy efficiency, featuring a SEER (Seasonal Energy Efficiency Ratio) rating higher than 20. This means that it operates efficiently across various climatic conditions, ensuring optimal cooling with minimal energy consumption. The high SEER rating not only translates to lower energy bills but also contributes to a reduced environmental footprint, making it a smart choice for eco-conscious consumers.

One of the standout features of the VC8 is its variable-speed compressor, which allows the system to adjust its output based on the cooling needs of the space. This technology enables the unit to run at lower speeds for longer periods, maintaining a consistent temperature while reducing energy usage. The variable-speed operation also contributes to quieter operation compared to traditional air conditioning systems. Homeowners can enjoy a peaceful indoor environment without the disruptive noise commonly associated with air conditioning units.

In terms of comfort, the Goodman VC8 employs advanced humidity control features, ensuring that moisture is efficiently managed within the space. This not only enhances comfort levels but also helps to prevent issues related to excessive humidity, such as mold growth and structural damage.

The VC8 is designed for reliable performance and durability, with its robust construction and dependable components. Goodman manufactures its products with high-quality materials to withstand the rigors of daily use and various weather conditions, ensuring long-lasting operation.

Additionally, the VC8 incorporates smart technology features, including compatibility with Wi-Fi-enabled thermostats. Homeowners can easily monitor and control their system remotely, providing convenience and peace of mind.

The Goodman VC8 is an exemplary solution for those looking for an energy-efficient, advanced air conditioning system. With its variable-speed compressor, excellent humidity control, durable construction, and smart features, it promises comfort and reliability suitable for any residential space. By choosing Goodman, homeowners can invest in a quality HVAC system designed to meet modern needs and preferences.