Carrier Infinity 25VNA4

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Owner’s Manual

A NOTE ABOUT SAFETY

Any time you see this symbol in manuals, instructions and on the

unit, be aware of the potential for personal injury. There are three levels

of precaution:

WARNING signifies hazards that could result in personal injury or

death.

CAUTION is used to identify unsafe practices which would result in

minor personal injury or product and property damage.

NOTE is used to highlight suggestions which will result in enhanced

installation, reliability, or operation.

ABOUT YOUR HEAT PUMP SYSTEM

Our products are designed, tested and built in accordance with US

Department of Energy standardized procedures and other standards;

however, actual operating results and efficiencies may vary based on

manufacturing and supplier tolerances, equipment configuration,

operating conditions and installation practices.

IDENTIFYING YOUR SYSTEM

Your new Carrier heat pump system is what we call a ”split system.” It

has an outdoor unit and an indoor unit connected to each other with

copper tubing called refrigerant lines. Each of these units has a rating

plate with the model and serial numbers you will need to reference when

calling an authorized Carrier dealer about your system.

Take a few moments now to locate those numbers and record them for

future reference.

USING YOUR NEW CARRIER SYSTEM

Your Carrier heat pump system is controlled by a wall-mounted Infinity

Control installed inside your home. This system requires an Infinity

Control which has software designed specifically to operate this system.

See the Infinity Control Homeowner Guide for more details on system

operation.

VARIABLE SPEED OPERATION

You may notice your system runs for longer periods of time. This

system is designed to meet cooling or heating needs of the home at a

wide range of conditions. Your indoor temperature will remain more

consistent with fewer drafts, better humidity control, enhanced comfort

and enhanced energy efficiency.

HEATING AND COOLING YOUR HOME

For heating or cooling operation, make sure the System or Mode control

is set to the appropriate mode. Then, adjust the Temperature control to

your desired setting. Finally, use the Fan control to select Automatic

(turns on and off as heating is needed) or On (runs continuously).

Depending on your typical heating needs, your home comfort system

may also include a supplementary heating source that will automatically

turn on as needed. You may also select this heat source manually if

desired.

OPERATION UNDER EXTREME CONDITIONS

Your heat pump will run as long as necessary to maintain the indoor

temperature selected on your Infinity Control. On extremely hot days,

your heat pump will run for longer periods at a time than on moderate

days. Your system will also run for longer periods of time under the

following conditions:

• Frequent opening of exterior doors

• Operating laundry appliances

• Taking hot showers

• More than the usual number of people present in the home

• More than the normal number of electric lights in use

• Drapes or blinds are open on the sunny side of the home

IMPORTANT HEAT PUMP FACTS

Heat pump systems have a few unique features and operations that you

should be aware of:

• During the heating cycle, your heat pump delivers a constant flow of

air at around 95°F (35°C)to about 105°F (41°C), compared to sudden

blasts of hot air provided by a typical furnace.

• Ice or frost may form on the outdoor coil during winter heating

operation. Your heat pump will automatically melt the ice using its

defrost cycle. During defrost, you may see steam or fog rising from

the outdoor unit, which is normal. At the beginning and end of the

defrost cycle, you may hear a ”whoosh” sound coming from the unit.

This is normal for heat pump applications.

• Heat pumps installed in areas expecting snow are elevated with

support feet.

SOUND

Your new heat pump with Greenspeed Intelligence is different from most

heating and cooling systems. Because this is a variable speed system, it

is designed to operate at different speeds depending on the temperature

and humidity conditions. You may notice the sound coming from the

outdoor unit changing from time to time, and from season to season. In

winter, the system will operate at higher speeds as it gets colder outside

to maintain its heating performance. The higher speed produces a higher

sound. This change of speeds allows the system to operate more

efficiently and maintain comfortable conditions inside the home. You

may also hear a slight “purr” at start-up and shut down. These sounds

are normal and do not represent a problem with your system.

ROUTINE MAINTENANCE

Simple, routine maintenance as described below will enhance your heat

pump system’s ability to operate economically and dependably. Always

remember the following safety precautions:

25VNA4

Infinity™Variable Speed Heat Pump

with Greenspeed™ Intelligence

2-5 Nominal Tons

WARNING

PERSONAL INJURY, DEATH AND / OR PROPERTY

DAMAGE HAZARD

Failure to follow this warning could result in personal injury, death or

property damage.

Improper installation, adjustment, alteration, service, maintenance, or

use can cause explosion, fire, electrical shock, or other conditions

which may cause personal injury or property damage. Consult a

qualified installer, service agency, or your distributor or branch for

information or assistance. The qualified installer or service agency

must use factory-authorized kits or accessories when modifying this

product.

Read and follow all instructions and warnings, including labels shipped

with or attached to unit before operating your new heat pump.

Other manuals for Carrier Infinity 25VNA4

Installation Instructions22 pages

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Summary

About Your Heat Pump System

Identifying Your System

Locate model and serial numbers for referencing your Carrier heat pump system.

Using Your New Carrier System

Control your heat pump using the Infinity Control installed inside your home.

Variable Speed Operation

System runs longer for consistent temperatures, fewer drafts, and enhanced comfort.

Heating and Cooling Your Home

Operation Under Extreme Conditions

Heat pump runs longer to maintain temps during hot days or specific conditions.

Important Heat Pump Facts

Explains heat pump features like constant airflow and defrost cycles.

Sound

Explains normal operating sounds of variable speed heat pump systems.

Routine Maintenance

Guidance on simple maintenance to enhance system operation and dependability.

Summary

About Your Heat Pump System

Identifying Your System

Locate model and serial numbers for referencing your Carrier heat pump system.

Using Your New Carrier System

Control your heat pump using the Infinity Control installed inside your home.

Variable Speed Operation

System runs longer for consistent temperatures, fewer drafts, and enhanced comfort.

Heating and Cooling Your Home

Operation Under Extreme Conditions

Heat pump runs longer to maintain temps during hot days or specific conditions.

Important Heat Pump Facts

Explains heat pump features like constant airflow and defrost cycles.

Sound

Explains normal operating sounds of variable speed heat pump systems.

Routine Maintenance

Guidance on simple maintenance to enhance system operation and dependability.

Overview

Function Description
Usage Features
Maintenance Features
Troubleshooting (Before Calling for Service)

The device described in this manual is the 25VNA4 Infinity™ Variable Speed Heat Pump with Greenspeed™ Intelligence, designed for 2-5 nominal tons. This is a "split system" heat pump, meaning it consists of an outdoor unit and an indoor unit connected by copper refrigerant lines. It is controlled by a wall-mounted Infinity Control, which requires specific software to operate this system effectively.

Function Description:

The primary function of this heat pump system is to provide both heating and cooling for your home. Unlike traditional systems, this is a variable speed heat pump, which means it can adjust its operation to meet the precise heating or cooling needs of the home across a wide range of conditions. This variable speed capability allows the system to run for longer periods at lower speeds, leading to more consistent indoor temperatures, fewer drafts, improved humidity control, enhanced comfort, and greater energy efficiency.

For heating or cooling operation, users select the appropriate mode (Heat or Cool) on the Infinity Control and set their desired temperature. The fan can be set to "Automatic" (turning on and off as needed for heating/cooling) or "On" (running continuously). Depending on heating needs, the system may also include a supplementary heating source that activates automatically or can be manually selected.

Usage Features:

Variable Speed Operation: A key feature is its variable speed operation. Users may notice the system runs for longer periods compared to conventional systems. This is by design to maintain consistent indoor temperatures, reduce drafts, and improve humidity control. The sound from the outdoor unit may also change from time to time and season to season, becoming louder at higher speeds when more heating performance is required in colder weather. A slight "purr" may also be heard at start-up and shut-down, which is normal.
Operation Under Extreme Conditions: The heat pump will operate as long as necessary to maintain the selected indoor temperature. During extremely hot days, it may run for longer periods. Factors that can influence runtime include frequent opening of exterior doors, operation of laundry appliances, taking hot showers, a higher-than-usual number of people in the home, increased use of electric lights, and open drapes or blinds on the sunny side of the home.
Heating Cycle Characteristics: During heating, the heat pump delivers a constant flow of air at around 95°F (35°C) to 105°F (41°C), which is a gentler warmth compared to the sudden blasts of hot air from a typical furnace.
Defrost Cycle: Ice or frost may form on the outdoor coil during winter heating. The system automatically melts this ice using its defrost cycle. During defrost, it's normal to see steam or fog rising from the outdoor unit and hear a "whoosh" sound at the beginning and end of the cycle.
Low Ambient Cooling Mode: If outdoor temperatures are below 55°F (13°C) and cooling is desired, users must enable "Low Ambient Cooling Mode" on the system control. In this mode, compressor speed range is restricted, and the outdoor fan may cycle to maintain proper operating pressures.
Bluetooth® Functionality: The product includes Bluetooth® functionality, allowing HVAC contractors to better service the unit. This enables them to pair with the unit, read diagnostic and other outdoor equipment information, and push software updates.

Maintenance Features:

Routine maintenance is crucial for economical and dependable operation.

Safety Precautions: Always disconnect all electrical power to the indoor air handler or furnace before performing any maintenance. Disconnect power to both indoor and outdoor units and use a suitable warning label. Be aware of sharp edges and wear appropriate protective clothing and gloves when handling parts.
Filter Maintenance: Keep the air filter on the indoor unit clean and properly installed. A clogged filter increases operating costs and shortens unit life. Refer to indoor unit literature for detailed cleaning information.
Unobstructed Airflow: Do not block floor, wall, or ceiling vents with drapes, furniture, toys, or other household items, as restricted airflow reduces efficiency and lifespan. The outdoor unit also requires unrestricted airflow; do not cover it, place items on or next to it, or allow debris (grass clippings, leaves) to accumulate on its sides or top. Maintain a minimum 12-inch (305 mm) clearance between the outdoor unit and tall grass, vines, or shrubs.
Condensate Drain Check: During the cooling season, the heat pump removes humidity, producing water that should trickle from the condensate drain of the indoor coil. Periodically check to ensure the drain system is not clogged. Drainage may be limited in very dry environments.
Base Pan Drainage: Periodically check for and remove debris around the base of the outdoor unit to ensure proper drainage and prevent standing water.
Level Installation: Ensure the outdoor unit remains level. If the support base settles or shifts, re-level it promptly to assure proper drainage and prevent water or ice collection beneath the unit.
Sea Coast Coil Maintenance: For units in coastal locations, additional maintenance is required due to corrosive ocean salt. Periodically wash all exposed surfaces and the outdoor coil (approximately every 3 months). Consult your Carrier dealer for proper cleaning intervals and procedures or consider a service contract.
Professional Dealer Maintenance: In addition to routine user maintenance, the home comfort system should be regularly inspected by a trained service technician. Many dealers offer service contracts, which may include benefits like parts discounts or no additional charge for "after hours" or emergency service.

Troubleshooting (Before Calling for Service):

Check indoor and outdoor disconnect switches, main electrical panel circuit breakers, or fuses.
Verify sufficient airflow: air filter(s) should be clean, and interior vents open and unobstructed.
Check Infinity Control settings: For cooling, desired temperature should be lower than displayed room temperature, and System/Mode set to Cool or Auto. For heating, temperature should be higher than displayed room temperature, and System/Mode set to Heat or Auto.
Be aware of time delays in unit operation, which are built-in protection features. These are normal and do not indicate a problem.

By understanding these features and following the recommended maintenance, users can ensure their 25VNA4 Infinity™ Variable Speed Heat Pump operates efficiently and reliably for years to come.

Carrier Infinity 25VNA4 Specifications

General

Cooling Capacity	24, 000 - 60, 000 BTU/H
Heating Capacity	24, 000 - 60, 000 BTU/H
SEER Rating	up to 24
Compressor Type	Variable Speed
Stages	Variable
Refrigerant	R-410A
Type	Heat Pump
Noise Level	As low as 51 dB