Carrier Infinity 25HNB5 User Manual

25HNB5
Infinityr 15 Heat Pump with Puronr Refrigerant
1–1/2 to 5 Nominal Tons (Size s 18–60)
Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory–authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes and
current editions of the National Electrical Code (NEC) NFPA 70.
In Canada, refer to current editions of the Canadian electrical code
CSA 22.1.
Recognize safety information. This is the safety–alert symbol
!
!
.
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understan d these signal words; DANGER, WARNING, and
CAUTION. These words are u sed with the safety–alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may 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.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tag switch with a suitable warning label.
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.
!
WARNING
INSTALLATION RECOMMENDATIONS
NOTE: In some cases noise in the living area has been traced to
gas pulsations from improper installation of equipment.
1. Locate unit away from windows, patios, decks, etc. where
unit operation sound may disturb customer.
2. Ensure that vapor and liquid tube diameters are appropriate
for unit capacity.
3. Run refrigerant tubes as directly as possible by avoiding un-
necessary turns and bends.
4. Leave some slack between structure and unit to absorb vi-
bration.
5. When passing refrigerant tubes through the wall, seal open-
ing with RTV or other pliable silicon–based caulk (see Fig.
1).
6. Avoid direct tubing contact with water pipes, duct work,
floor joists, wall studs, floors, and walls.
7. Do not suspend refrigerant tubing from joists and studs with
a rigid wire or strap which comes in direct contact with
tubing (see Fig. 1).
8. Ensure that tubing insulation is pliable and completely sur-
rounds vapor tube.
9. When necessary, use hanger straps which are 1 in. wide and
conform to shape of tubing insulation (see Fig. 1).
10. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.
INSULATION
SUCTION TUBE
LIQUID TUBE
OUTDOOR WALL INDOOR WALL
LIQUID TUBE
SUCTION TUBE
INSULATION
CAULK
HANGER STRAP
(AROUND SUCTION
TUBE ONLY)
JOIST
1” (25.4 mm)
MIN
THROUGH THE WALL
SUSPENSION
A07588
Fig. 1 --- Connecting Tubing Installation
When outdoor unit is connected to factory–approved indoor unit,
outdoor unit contains system refrigerant charge for operation with
AHRI rated indoor unit when connected by 15 ft. (4.57 m) of
field–supplied or factory accessory tubing. For proper unit
operation, check refrigerant charge using charging information
located on control box cover and/or in the Check Charge section of
this instruction.
IMPORTANT: Maximum liquid–line size is 3/8–in. OD for all
residential applications including long line.
IMPORTANT: Always install the factory–supplied liquid–line
filter drier . Obtain replacement filter driers from your distributor or
branch.

Carrier Infinity 25HNB5 Specifications

General

Type	Heat Pump
Cooling Capacity	24, 000 - 60, 000 BTU/h
Heating Capacity	24, 000 - 60, 000 BTU/h
SEER Rating	Up to 19
Stages	Variable
Refrigerant	R-410A
Sound Level	As low as 56 dB
Compressor Type	Variable Speed
Operating Temperature Range (Cooling)	Up to 125°F

Summary

Safety Considerations

Electrical Shock Hazard

Warning about the danger of electrical shock during installation and servicing.

Explosion Hazard

Warning about the risk of explosion from using oxygen or air for leak testing.

Installation Recommendations

Unit Placement and Tubing Installation

Key guidelines for unit placement, refrigerant line routing, and vibration absorption.

Equipment Inspection and Site Preparation

Unpack and Inspect Unit

Procedures for unpacking, inspecting for damage, and verifying unit specifications.

Clearance Requirements

Operating Ambient and Elevation

Specifies ambient temperature ranges and unit elevation guidelines.

Piping Connections

Safety Warnings for Piping

Critical safety warnings regarding refrigerant handling, burial, and valve protection.

Indoor Unit Connection and Adapter Tube

Install Adapter Tube

Procedure for installing the adapter tube onto the liquid service valve.

Brazing and Leak Testing Procedures

Brazing Connections and Fire Hazard

Guidelines for brazing connections, including fire safety precautions.

Evacuation and Deep Vacuum Method

Process for evacuating refrigerant tubing and coil using the deep vacuum method.

Electrical Connections and Wiring

Ground, Power, and Control Wiring

Instructions for connecting unit ground, power, and 24V control wiring.

Final Checks and Accessories

Importance of wiring checks, crankcase heater, and accessory installation.

Thermistor Attachments and Startup

OAT and OCT Thermistor Check

How to check the installation of Outdoor Air and Coil Temperature thermistors.

Startup Safety Precautions

Critical safety precautions for unit startup to prevent damage or injury.

System Charging and Heating Checks

Checking Refrigerant Charge

Guidance on using the subcooling method to check and adjust refrigerant charge.

Heating Check Chart Procedure

How to use the heating check chart to verify system operation.

Standard Thermostat Operation Sequence

Cooling and Heating Modes

Describes sequences for cooling and heating with standard thermostats.

Heat Pump System Functions

Cooling & Heating Operation

Explains operation for both cooling and heating demands in heat pump systems.

System Indicators and Operations

Communication and Status Lights

Explains the function of COMM and Amber status LEDs.

Crankcase Heater and Fan Motor Operation

Details on crankcase heater and outdoor fan motor operation.

Time Delays

Lists the various time delays implemented in the unit's operation.

Utility Interface and Low Ambient Cooling

Utility Interface Usage

How utility interface functions with Infinity and standard controls.

Low Ambient Cooling Requirements

Conditions and configurations for low ambient cooling operation.

Defrost Modes

Defrost Hold, Forced Defrost, and Quiet Shift-2

Explains defrost hold, forced defrost initiation, and Quiet Shift-2.

Solenoid Accessory and Major Components

Liquid Line Solenoid Wiring

Wiring instructions for liquid line solenoids with different controls.

Control Board and Compressor Protection

Overview of control board functions and compressor internal protection.

TROUBLESHOOTING

Communication and Voltage Issues

Troubleshooting communication failures, brown outs, and voltage problems.

Pressure Switch and Thermal Protection

Diagnosing issues related to pressure switches and compressor thermal cutouts.

Thermistor Functionality and Troubleshooting

Thermistor Comparison and Defaults

How thermistors are compared and default operations upon failure.

Status Codes and Diagnostics

Interpreting status codes flashed by the amber LED for diagnostics.

Final Installation Checks

Wiring, Tubing, and Manuals

Final checks on wiring, tubing security, valve caps, and user manual handover.

Maintenance and Quick Reference

Care and Maintenance Guidelines

Recommendations for ongoing periodic maintenance of the equipment.

Puron (R-410A) Quick Reference

Key information and precautions for servicing Puron refrigerant systems.