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Trane Technologies 4TTR7 User Manual

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Installers Guide
March 2020
18-AC115D1-1B-EN
SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating,
and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or
altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all pre-
cautions in the literature and on the tags, stickers, and labels that are attached to the equipment.
4TTR7048B
Note: “Graphics in this document are for representation only.
Actual model may differ in appearance.”
Condensing Units
4TTR7
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Trane Technologies 4TTR7 Specifications

General IconGeneral
BrandTrane Technologies
Model4TTR7
CategoryAir Conditioner
LanguageEnglish

Summary

Section 1. Safety

Safety Warnings and Precautions

General warnings about qualified installers, R-410A refrigerant, and electrical hazards.

Installation and Component Cautions

Cautions regarding brazing existing lines and hot compressor domes.

Section 2. Unit Location Considerations

Unit Dimensions and Weight Details

Details unit dimensions (H x D x W) and weight for model 4TTR7048B.

Refrigerant Piping Length Limits

Specifies maximum total and vertical refrigerant line lengths.

Location Guidelines for Reliability

Guidelines for unit placement to ensure airflow and avoid noise.

Cold Climate Installation Precautions

Precautions for installing units in areas with snow and freezing temperatures.

Coastal Installation Kit Requirement

Requirement for Seacoast Kit for installations near salt water.

Section 3. Unit Preparation

Prepare Unit Before Installation

Steps to check for damage and remove the unit from its pallet.

Section 4. Setting the Unit

Support Pad Installation Criteria

Criteria for installing the unit on a support pad.

Section 5. Refrigerant Line Considerations

Line Size and Service Valve Connections

Table detailing line sizes, service valve connections, and max lengths for model 4TTR7048B.

Factory Charge Information

Information on the factory charge for the outdoor unit and connecting lines.

Determine Refrigerant Line Length

Prompt to determine required refrigerant line length and lift for later use.

Vapor Line Insulation Requirement

Importance of insulating the vapor line and preventing metal-to-metal contact.

Reusing Existing Refrigerant Lines

Precautions when reusing existing refrigerant lines, emphasizing brazing.

Section 6. Refrigerant Line Routing

Best Practices for Line Routing

Guidelines for routing refrigerant lines to prevent noise and vibration.

Section 7. Refrigerant Line Brazing

Step-by-Step Brazing Procedure

Step-by-step instructions for brazing refrigerant lines, including preparation.

Section 8. Refrigerant Line Leak Check

Performing a Refrigerant Leak Check

Procedure for pressurizing lines with nitrogen and checking for leaks.

Section 9. Evacuation

Evacuating Refrigerant Lines and Coil

Steps to evacuate the system using a micron gauge to a specific vacuum level.

Section 10. Service Valves

Opening the Gas Service Valve

Steps to open the gas service valve after evacuation.

Opening the Liquid Service Valve

Steps and warnings for opening the liquid line service valve.

Section 11. Electrical – Low Voltage

Low Voltage Wire Length Limits

Table showing maximum wire lengths for 24V low voltage wiring based on gauge.

Low Voltage Wiring Diagrams

Wiring diagrams for connecting thermostats to air handlers and furnaces.

Section 12. Electrical – High Voltage

High Voltage Power Supply Guidelines

Warning and guidelines for high voltage power supply connection.

High Voltage Disconnect Switch

Recommendation for installing a separate disconnect switch for high voltage.

High Voltage Grounding Procedure

Requirement to ground the outdoor unit according to code.

Section 13. System Start Up

System Start Up Steps

Step-by-step procedure for starting up the system.

Section 14. System Charge Adjustment

Temperature Measurements for Charging

Instructions for checking outdoor and indoor temperatures for charge adjustment.

Subcooling Charging in Cooling Mode

Method for charging the system in cooling mode above 55°F outdoor temperature.

Charging Below 55°F Outdoor Temperature

Recommended method for charging below 55°F outdoor temperature using weigh-in.

Section 15. Checkout and Troubleshooting

Operational Checkout Procedures

List of procedures to check system operation and charge after installation.

Troubleshooting System Faults

System faults and potential causes for refrigerant and electrical issues.

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