Carrier 25TPA7 - User Manual

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. Understand these signal words;
DANGER, WARNING, and CAUTION. These words are used 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 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.
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
unnecessary turns and bends.
4. Leave some slack between structure and unit to absorb vibration.
5. When passing refrigerant tubes through the wall, seal opening 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 surrounds
vapor tube.
9. When necessary, use hanger straps which are 1 in. (25.4 mm) 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.
A07588
Fig. 1 – Piping 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 line line.
IMPORTANT: Always install the factory-supplied liquid-line filter
drier. Obtain replacement filter driers from your distributor or branch.
25TPA7
Performance™ Series 2-Stage Heat Pump
with Puron Refrigerant
2 To 5 Tons
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.
WARNING
!
EXPLOSION HAZARD
Failure to follow this warning could result in
death, serious personal injury, death, and/or
property damage.
Never use air or any gas containing oxygen for
leak testing or operating refrigerant
compressors. Never allow compressor suction
pressure to operate in a vacuum with service
valves closed. See Service Manual for
pump-down instructions.

Carrier 25TPA7 Specifications

General

Brand	Carrier
Model	25TPA7
Category	Heat Pump
Language	English

Summary

Installation Instructions

Safety Considerations

Key safety warnings and precautions for installation, including DANGER, WARNING, and CAUTION.

Electrical Shock Hazard

Warning regarding potential electrical shock hazard during installation and service.

Explosion Hazard

Warning regarding explosion hazard related to refrigerant handling and compressors.

Installation Recommendations

Guidelines and best practices for unit placement and piping installation.

Installation Procedures and Site Preparation

Cut Hazard

Caution about sharp edges on sheet metal parts and need for protective gear.

Equipment and Job Site Checks

Steps to inspect the unit and prepare the installation site according to standards.

Mounting and Clearance Requirements

Instructions for mounting the unit on a level pad and maintaining necessary clearances.

Defrost Thermostat and Unit Elevation

Guidance on checking the defrost thermostat and elevating the unit for drainage and snow clearance.

Piping and Service Valve Preparation

Make Piping Connections

Instructions for making refrigerant piping connections, emphasizing safety.

Personal Injury and Environmental Hazard

Warnings about refrigerant handling, pressure relief, and venting regulations.

Unit Damage Hazard

Caution regarding potential equipment damage from improper piping or burial.

Service Valves and Piston Installation

Instructions on handling and preparing service valves, including piston installation.

Brazing and Filter Drier Installation

Brazing Connections Safety

Warnings about fire hazards during brazing and the need for heat sinking and protective gear.

Liquid Line Filter Drier Installation

Procedure for installing the liquid line filter drier, including brazing precautions.

System Evacuation and Electrical Connections

Evacuate Refrigerant Tubing and Indoor Coil

Procedure for evacuating the system using the deep vacuum method, avoiding compressor use.

Electrical Shock Hazard

Warning about electrical shock hazard and proper grounding of the unit.

Power and Control Wiring

Instructions for connecting ground, power wiring, and control wiring to the unit.

Wiring Diagrams and Airflow Configuration

Wiring Diagrams

Illustrations showing thermidistat wiring for fan coil and furnace configurations.

Final Wiring Check

Final verification of wiring and tubing security before closing panels.

Compressor Crankcase Heater Operation

Information on the crankcase heater and its power requirements for proper operation.

Airflow Selection for Furnaces

Instructions for selecting proper airflows for ECM and variable speed furnaces during cooling stages.

Start-Up Procedures and Sequence of Operation

Start-Up Safety Precautions

Essential safety warnings for personal injury, environmental protection, and unit operation during start-up.

Sequence of Operation Details

Explanation of the unit's operational sequence for cooling, heating, and compressor stages.

Compressor Operational Features

Details on the 2-stage compressor modulation, capacity control, and Quiet Shift-2 feature.

Defrost Control and System Charging

Defrost Control and Speedup

Explanation of the defrost control, timing, and procedure for initiating a forced defrost.

System Charge Check

Procedure for checking and adjusting refrigerant charge under specific temperature conditions.

Heating Check Chart and Stage Switching

Guidance on using heating charts and verifying proper switching between low and high capacity stages.

Troubleshooting and Maintenance

Unloader Test Procedure

Methods to test the compressor unloader mechanism for proper operation.

Final Checks and Troubleshooting Data

Final installation checks, winding resistance data, and compressor protection details.

Care and Maintenance Recommendations

Recommendations for ongoing care and maintenance to ensure high performance and minimize failures.