Trane 4TXCB004DS3HCC - User Manual

This document is an installer's guide for a cased aluminum "convertible" coil, specifically models 4TXCB004DS3HCC and 4TXCD010DS3HCC. It provides comprehensive instructions for the installation, operation, and maintenance of the coil, emphasizing compliance with national, state, and local codes.

Function Description:

The device is an indoor cased aluminum "convertible" coil designed for use in combination with a heat pump or cooling outdoor section that uses R-410A refrigerant. Its primary function is to facilitate heat exchange in an HVAC system, working in conjunction with a furnace to provide conditioned air. The "convertible" aspect suggests its adaptability to various installation orientations, including upflow, downflow, horizontal right, and horizontal left, to suit different residential configurations, including mobile homes, provided the total height of the furnace, coil, and discharge ductwork is 7 ft. or less.

Important Technical Specifications:

The guide provides a table of specifications for the two models:

4TXCB004DS3HCC:
- Shipping Weight: 58 lbs.
- Refrigerant Control: TXV (Non-Bleed)
- Height "A": 22-1/2 in.
- Overall Width "B": 17-1/2 in.
- Opening Width "C": 16-5/8 in.
- Top Opening "D": 15-3/4 in.
- Gas Connection: 7/8 in.
- Liquid Connection: 3/8 in.
- Matched Furnace Width (No Adapter Required): 17-1/2 in.
- Drain Pan: Plastic
4TXCD010DS3HCC:
- Shipping Weight: 81 lbs.
- Refrigerant Control: TXV (Non-Bleed)
- Height "A": 30-3/4 in.
- Overall Width "B": 24-1/2 in.
- Opening Width "C": 23-5/8 in.
- Top Opening "D": 22-3/4 in.
- Gas Connection: 7/8 in.
- Liquid Connection: 3/8 in.
- Matched Furnace Width (No Adapter Required): 24-1/2 in.
- Drain Pan: Plastic

Maximum Airflow Settings (CFM):

The guide specifies maximum airflow settings to prevent water blow-off in certain installation positions:

4TXCB004DS3HCC:
- Upflow: 1350 CFM
- Downflow: 1100 CFM
- Horizontal Left: 1200 CFM
- Horizontal Right: 1350 CFM
4TXCD010DS3HCC:
- Upflow: 2250 CFM
- Downflow: 1850 CFM
- Horizontal Left: 2000 CFM
- Horizontal Right: 2250 CFM

The TXV (Thermostatic Expansion Valve) setting on this unit may run high superheat (15-25°F) by design when measured at the outdoor unit.

Usage Features:

Installation Flexibility: The coil is designed for various orientations (upflow, downflow, horizontal right, horizontal left) to accommodate different furnace setups.
Downstream Installation: The coil MUST be installed downstream (in the outlet air) of the furnace.
Airflow Optimization: For certain orientations, optional removal of coil components (like outer water diverter baffles) is recommended to maximize airflow efficiency.
Splash Guard (Horizontal Left): A splash guard installation is required in horizontal left configurations to prevent water blowoff.
Refrigerant Lines: Detailed instructions are provided for installing and brazing refrigerant lines, emphasizing the use of good brazing techniques, minimizing sharp bends, and insulating the suction line. The TXV bulb must be protected during brazing.
Leak Check: A procedure for leak checking brazed line connections using dry nitrogen and soap bubbles is outlined.
Condensate Drain Piping: Connections are located in the drain pan. While a field-fabricated trap is not required for proper drainage due to positive furnace pressure, it is recommended to prevent efficiency loss. The primary drain line should be insulated to prevent sweating.
Optional Downflow Gasket Installation: For unusually humid applications (prolonged operation above 70% RH), a BAYGSKT001A0 gasket kit is recommended to prevent water from forming on the bottom of the drain pan and dripping into the supply ductwork.

Maintenance Features:

Coil Cleaning: The coil features a two-piece door design that allows for easy removal of outer casing doors without interfering with refrigerant or condensate lines. Once the outer doors are removed, the inner coil panels can be easily removed, allowing for the inside and outside of the coil to be cleaned with a brush and vacuum.
Insulation Cleaning: The foil-covered insulation should be wiped down, and residual dirt and dust vacuumed up to maintain good air quality.
Troubleshooting Guide: A detailed flowchart is provided for troubleshooting indoor TXV in cooling mode, covering issues related to sub-cooling, superheat, airflow, liquid line temperature, and indoor temperature. This guide helps diagnose problems such as low superheat, high superheat, and restricted outdoor coil, leading to solutions like correcting airflow, checking refrigerant charge, or replacing the TXV.
Pre-Maintenance Check: Before troubleshooting, it is important to ensure the blower wheel, indoor, and outdoor coils are clean.