Trane 2TWB0012-036AA - User Manual

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ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES

IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information

pack upon completion of work.

Installer’s Guide

space. The barrier should be constructed of materials

which will blend in with the building design.

3. Avoid locating the unit where condensation and freezing

of defrost vapor may annoy the customer. For instance,

installing the unit under a bedroom, kitchen, or picture

window may be annoying to the customer since conden-

sate and fog will occur during the defrost cycle.

4. Avoid locating the unit under the eaves or other over-

head structures as sizeable icicles may form and the unit

may be damaged by these falling icicles.

B. LOCATION AND PREPARATION

OF THE UNIT

1. When removing unit from the pallet, notice the tabs on

the basepan. Remove tabs by cutting with a sharp tool as

shown on page 2, Figure 2, and slide unit off of pallet.

2. The unit should be set on a level support pad at least as

large as the unit base pan, such as a concrete slab. If this

is not the application used please refer to application

bulletin SSC-APG002-EN.

3. The support pad must NOT be in direct contact with any

structure. Unit must be positioned a minimum of 12"

from any wall or surrounding shrubbery to insure

adequate airflow. Clearance must be provided in front of

Heat Pumps

2TWB0012-036AA

These instructions do not cover all variations in

systems nor provide for every possible contingency to

be met in connection with installation. All phases of

this installation must comply with NATIONAL, STATE

AND LOCAL CODES. Should further information be

desired or should particular problems arise which are not

covered sufficiently for the purchaser’s purposes, the matter

should be referred to your installing dealer or local distributor.

A. GENERAL

The following instructions cover 2TWB0012-036AA Heat

Pump Units.

NOTE:

These outdoor units may be used with indoor units

equipped with Thermostatic Expansion Valve or Accutron™

Flow Control Check Valve (F.C.C.V.) assembly for refrigerant

flow control only.

Check for transportation damage after unit is uncrated.

Report promptly, to the carrier, any damage found to the unit.

To determine the electrical power requirements of the unit,

refer to the nameplate of the unit. The electrical power

available must agree with that listed on the nameplate.

The Weathertron

Heat Pump has been designed and

manufactured to withstand and operate in severe winter

conditions. However, there are precautionary steps which

should be taken at the time of installation which will help

assure the efficient operation of the unit. It is recom-

mended that these precautions be taken for units

being installed in areas where snow accumulation and

prolonged below freezing temperatures occur.

1. Units should be elevated 3 to 12 inches above the pad or

rooftop, depending on local weather. This additional

height will allow better drainage of snow and ice (melted

during defrost cycle) prior to its refreezing. This should

prevent a build-up of ice around the unit which occurs

when unit is not elevated. Insure that drain holes in

unit base pan are not obstructed preventing

draining of defrost water.

2. If possible, avoid locations that are likely to accumulate

snow drifts. If not possible, a snow drift barrier should be

installed around the unit to prevent a build-up of snow

on the sides of the unit and should be of sufficient

distance from the unit to prevent restriction of airflow to

and from the unit. Also allow for proper maintenance

5 FT. ABOVE UNIT-UNRESTRICTED

18-BC52D5-5

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Summary

General Unit Information and Precautions

Outdoor Unit Installation Precautions

Measures for elevation, snow drifts, condensation, and eaves to ensure proper operation.

Unit Location and Preparation

Site Selection and Pad Requirements

Guidance on setting the unit on a level support pad and basepan tab removal.

Clearance and Airflow Requirements

Ensuring unrestricted airflow by maintaining proper clearances from walls and structures.

Accutron Flow Control Valve

Accutron Valve Orifice Sizing

Determining the correct orifice size for system rated performance.

Refrigerant Line Installation

Refrigerant Line Routing and Bending

Practical methods for running refrigerant lines, considering bends and space limitations.

Securing and Insulating Refrigerant Lines

Steps for fastening lines, insulation, and preventing contact between lines.

Service Valve Operation and Leak Checks

Brazing Refrigerant Lines

Procedures for brazing connections using nitrogen purge and proper techniques.

Refrigerant Line Leak Detection

Pressurizing lines with dry nitrogen and checking for leaks using soap bubbles.

System Evacuation and Charging

Evacuation Procedure Steps

Steps for evacuating refrigerant lines and indoor coil to specified micron levels.

Electrical Connections and Defrost Control

Electrical Wiring and Safety

Guidelines for power wiring, grounding, and safety precautions.

Defrost Control Operation and Faults

Understanding defrost control signals, fault identification, and pin identification.

Defrost Control Checkout

Procedures for checking normal operation and initiating a forced defrost.

Startup and Operational Procedures

Initial Compressor Start-Up Procedure

Procedure for setting thermostat and applying power to activate sump heat.

Unit Operational and Checkout Steps

Final unit operation and checkout procedures for proper performance.

Electric Heater Installation Notes

Instructions for installing electric heaters within the air handling device.

Outdoor Thermostat Installation

Guidance on field installation of an outdoor thermostat.

Seacoast Salt Shield Requirements

Information on applying salt shields for units near saltwater environments.

Checkout Procedure

Post-Installation System Checklist

Comprehensive list of checks for refrigerant lines, electrical, and system operation.

This document describes the Trane 2TWB0012-036AA Heat Pump Units, providing installation, operation, and maintenance guidelines. It emphasizes compliance with national, state, and local codes for all installation phases.

Function Description:

The Trane 2TWB0012-036AA is a heat pump unit designed for outdoor installation, capable of operating in severe winter conditions. It works in conjunction with indoor units equipped with a Thermostatic Expansion Valve or Accutron™ Flow Control Check Valve (F.C.C.V.) assembly for refrigerant flow control. The unit's primary function is to provide heating and cooling to a building by transferring heat between the indoor and outdoor environments. It incorporates a demand defrost control system that measures outdoor ambient and coil temperatures to determine the need for defrost cycles, ensuring efficient operation in cold weather.

Important Technical Specifications:

Model Numbers: 2TWB0012AA, 2TWB0018AA, 2TWB0024AA, 2TWB0030AA, 2TWB0036AA.
Refrigerant Lines: Maximum length from outdoor to indoor unit should not exceed 80 feet.
Lift Limitations: Maximum lift should not exceed 60 feet for suction line (outdoor unit above air handler) or liquid line (air handler above condensing unit).
Electrical Power: Requirements are specified on the unit's nameplate and must match available power.
Low Voltage Wiring:
- 18 AWG: Max. 150 ft
- 16 AWG: Max. 225 ft
- 14 AWG: Max. 300 ft
Orifice Size: The outdoor unit is shipped with the proper size orifice, and a stick-on orifice size label is provided. The outdoor unit nameplate specifies the correct orifice size (e.g., BAYFCCV --- A). If the indoor unit is factory-shipped with a different orifice size, it must be changed to match the outdoor unit's requirement for system-rated performance.
Refrigerant Charge: The unit is shipped with a NITROGEN holding charge. Refrigerant charge adjustment is necessary after evacuation, using the Charging Charts in the outdoor unit Service Facts.
Service Valves: Brass Liquid and Gas Line Service Valves are factory-shipped in the seated position to hold the factory charge. Pressure taps are provided for compressor suction and liquid pressures. The liquid line valve is not a back-seating valve.

Usage Features:

Installation Flexibility: Can be installed on a level support pad (e.g., concrete slab) or rooftop.
Clearances:
- Minimum 12 inches from any wall or surrounding shrubbery for adequate airflow.
- Top discharge area must be unrestricted for at least 5 feet above the unit.
- Sufficient space for service access to the control box and other components.
Defrost Control: Features a demand defrost control that uses outdoor ambient and coil sensors to initiate defrost cycles only when needed, optimizing energy efficiency. A flashing light on the defrost control board indicates fault conditions, with normal operation indicated by a flash once per second.
System Start-up: Requires setting the thermostat system switch to OFF and applying power for one hour before changing the switch to prevent compressor overload trip during initial start-up.
Refrigerant Line Installation: Guidelines for routing, bending, and securing refrigerant lines to prevent vibration transmission and ensure proper flow. The gas line must always be insulated.
Electrical Connections: Requires power wiring and grounding to comply with local codes. A separate disconnect switch must be installed at the outdoor unit. Flexible electrical conduit is recommended to prevent noise from vibration.
Thermostat Compatibility: Designed to work with indoor thermostats, with specific wiring instructions provided in the hook-up diagram. An optional outdoor thermostat (TAYSTAT250B) can be field-installed.

Maintenance Features:

Leak Check: After brazing refrigerant lines, all field-brazed connections must be checked for leaks by pressurizing with dry nitrogen (350-400 psi) and using soap bubbles.
System Evacuation: Requires evacuating refrigerant lines and the indoor coil to no higher than 350 microns before opening the gas and liquid line valves.
Brazing Precautions: Instructions for brazing refrigerant lines, including removing pressure tap valve cores, wrapping valve bodies with wet rags to prevent heat damage, and using a dry nitrogen purge to prevent oxidation. Precautions are also noted to avoid heat damage to the basepan.
Service Valve Operation: Detailed steps for opening liquid and gas line service valves, emphasizing caution to turn valve stems counterclockwise only until they contact the rolled edge. Caps on valve stems and pressure tap ports must be replaced and tightened to prevent leaks.
Troubleshooting Chart: A comprehensive chart is provided to diagnose system faults, categorized by refrigerant circuit, electrical issues, and defrost problems, with primary and secondary causes identified.
Check-out Procedure: A checklist to ensure proper installation and operation, including verifying refrigerant lines, insulation, electrical connections, fan operation, drain line function, thermostat accuracy, and correct blower motor speed tap.
Seacoast Salt Shield: For units installed within one mile of saltwater, the addition of a BAYSEAC001 (Seacoast Kit) is recommended for corrosion protection.