I. ELECTRIC HEATERS

Electric heaters, if used, are to be installed in the air han- dling device according to the instructions accompanying the air handler and the heaters.

J. START CONTROL

Some models have quick start components which are factory installed. For models that do not have factory installed start components, provisions are made for a field installed start kit accessory. When adding an accessory, follow the instructions provided with the kit.

K. OUTDOOR THERMOSTAT

An outdoor thermostat TAYSTAT250B may be field installed. For data, see wiring diagram attached to unit and instruction sheet packaged with outdoor thermostat.

L. SEACOAST SALT SHIELD

Units installed within one (1) mile of salt water including seacoasts and inland waterways, require the addition of BAYSEAC001 (Seacoast Kit) at the time of installation.

IMPORTANT:

See Limited Warranty information in Use and Care Manual.

Installer’s Guide

M. TROUBLESHOOTING

TROUBLESHOOTING CHART — WHAT TO CHECK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.

 

 

 

REF

 

 

 

*

 

 

 

 

 

 

 

 

 

 

 

CONTROL

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

WHAT

HIGH

 

 

 

 

 

 

 

 

 

 

 

.

 

 

 

.

 

 

 

DEFROST

 

 

 

 

 

 

 

 

 

LOW

 

 

 

STUCK

REF

 

 

AIR

 

 

CIR

SOVCHECK

 

 

 

 

 

 

 

 

 

CONTACTOR

 

 

LOW

 

EXCESSIVE

RES

 

 

 

 

 

DEFROST

 

 

TO

 

 

 

 

 

 

 

 

 

REF

 

 

TXV

RES .

 

 

 

 

 

 

 

START

 

 

 

 

 

 

 

.

 

 

.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.

 

 

 

 

 

.

 

 

COIL

 

 

 

 

POWERVOLTAGE

RUN

 

 

VOLTAGE

 

 

 

INEFFICIENT

 

 

O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.

 

 

 

I

 

 

 

VALVE

 

 

SYSTEM FAULTS CHECK COMPRESSOR

START

 

 

CONTACTOR

 

 

 

.

 

 

D

 

SOV

 

 

 

 

 

 

 

 

VOLTAGE

 

 

 

 

 

.

 

 

 

 

CONTROL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NONCONDENSABLESSTUCK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

 

 

EVAP

RECIRCULATIONRESTRICTIONS

RELAY

 

 

 

 

 

 

 

 

 

 

 

UNDERCHARGE.

 

 

 

 

 

 

 

 

 

 

 

 

 

THERMOSTATCOMPRESSOROVERCHARGE

 

 

SUPERHEAT

 

DEFECTIVE

 

 

 

 

 

 

CAPACITORCAPACITORCONTACTS

 

 

 

 

 

 

 

AIRFLOW

 

 

 

 

 

SUPPLYWIRING

 

 

RELAY

WIRING

 

 

FUSE COMP

 

 

 

AIRFLOWLEAKINGLEAKING

 

 

 

MODE

 

IOL

 

 

 

 

 

LOAD

 

 

OPEN

 

 

 

 

 

DEFDEF

 

 

 

 

 

 

 

 

 

 

 

COIL

.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

. .

REFRIGERANT CIRCUIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Head Pressure Too High

 

C

 

 

 

 

 

 

 

 

 

 

 

 

P

P

S

P

S

 

 

 

S

 

 

 

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

P

P

S

 

 

 

 

P

S

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Head Pressure Too Low

 

C

 

 

 

 

 

 

 

 

 

 

 

S

P

 

 

 

 

 

S

S

 

S

S

S

P

 

 

H

 

 

 

 

 

 

 

 

 

 

 

S

P

 

 

 

 

 

S

S

 

S

S

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Suction Pressure Too High

 

C

 

 

 

 

 

 

 

 

 

 

 

S

P

P

 

 

 

 

S

 

 

P

 

P

 

 

H

 

 

 

 

 

 

 

 

 

 

 

S

 

 

 

 

 

 

 

S

 

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Suction Pressure Too Low

 

C

 

 

 

 

 

 

 

 

 

 

 

 

P

 

 

 

 

 

 

S

P

S

 

S

 

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

P

 

 

 

S

S

 

S

 

S

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Liquid Refrig. Floodback (TXV)

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P

 

 

 

 

 

P

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P

 

 

 

 

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I.D. Coil Frosting

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

P

 

 

 

S

S

 

 

 

 

 

 

 

 

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor Runs

 

 

C

 

 

 

 

 

 

 

 

 

 

 

S

P

 

S

S

 

 

 

S

P

S

S

S

S

 

Inadequate or No Cooling/Htg

 

H

 

 

 

 

 

 

 

 

 

 

 

S

P

 

 

S

 

 

 

S

P

S

S

 

S

 

ELECTRICAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor & O.D. Fan

 

C

P

P

 

 

 

 

 

S

P

S

P

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Won’t Start

 

 

H

P

P

 

 

 

 

 

S

P

S

P

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor Will Not Start

 

C

 

P

S

P

S

S

S

 

 

 

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

But O.D. Fan Runs

 

 

H

 

P

S

P

S

S

S

 

 

 

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O.D. Fan Won’t Start

 

C

 

P

 

P

 

 

S

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 

P

 

P

 

 

S

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor Hums But Won’t Start

 

C

 

 

 

P

S

S

S

 

 

 

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 

 

 

P

S

S

S

 

 

 

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor Cycles on IOL

 

C

 

P S P S S S

 

 

 

 

P S P P S

 

S S

 

S

 

 

S

 

 

 

 

H

 

P S P S S S

 

 

 

 

P S P P S

 

S

 

 

S P

 

S

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I.D. Blower Won’t Start

 

C

P

P

 

 

 

 

 

S

P

S

 

S

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

P

P

 

 

 

 

 

S

P

S

 

S

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DEFROST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Unit Won’t Initiate

Defrost

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P

P

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defrost Terminates on Time

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

P

 

 

 

 

 

 

 

 

 

 

 

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Unit Icing Up

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

P

 

 

 

S

S

 

 

S

 

 

P

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C - Cooling

H - Heating

P - Primary Causes

 

S - Secondary Causes

* - 3 Phase Only

 

 

 

 

 

 

 

 

TYPICAL FIELD HOOK-UP DIAGRAMS

Notes:

1.Be sure power supply agrees with equipment nameplate.

2.Power wiring and grounding of equipment must comply with local codes.

3.Low voltage wiring to be No. 18 AWG minimum conductor.

4.ODT-B must be set lower than ODT-A.

5.If outdoor thermostats (ODT) are not used, connect W1 to W2 and W3.

6.N/A to programmable thermostat.

LEGEND

FACTORY WIRING

FIELD WIRING

18-BC61D1-1

5

Page 4 Page 6
Page 5
Image 5
Trane 4TWB3 manual Typical Field HOOK-UP Diagrams
Page 4 Page 6

4TWB3 specifications

The Trane 4TWB3 is a high-efficiency, energy-efficient heat pump designed to offer premium heating and cooling solutions for residential applications. It is part of Trane's multi-stage comfort systems, ensuring optimal performance and energy savings throughout the year. One of the standout features of the 4TWB3 is its variable-speed technology. This allows the unit to operate at different speeds depending on the heating or cooling demand, providing precise temperature control while consuming less energy.

Another key characteristic of the 4TWB3 is its advanced refrigerant system. It uses R-410A refrigerant, which is environmentally friendly and contributes to better energy efficiency compared to older refrigerants. The system's enhanced coil design and modern compressor technology further improve heat transfer, enhancing overall performance.

The Trane 4TWB3 also incorporates an integrated comfort control system. This feature provides users with the ability to monitor and adjust their home’s climate settings conveniently, ensuring a consistently comfortable indoor environment. Additionally, the unit is equipped with Trane’s patented WeatherGuard II top, which helps protect the heat pump from harsh weather conditions, ensuring durability and longevity.

Noise reduction is another significant feature of the 4TWB3. With its acoustic insulation and quiet operation design, the unit operates at lower sound levels, ensuring peace and quiet in your home. The heat pump is also designed with a corrosion-resistant cabinet, which further extends its lifespan and reliability.

In terms of energy efficiency, the Trane 4TWB3 boasts impressive SEER (Seasonal Energy Efficiency Ratio) ratings, making it an economical option for homeowners looking to reduce their energy bills. Its energy-efficient design not only aligns with environmental standards but also qualifies for various rebates and incentives, making it a smart investment.

Installation and maintenance are simple with the 4TWB3, thanks to its user-friendly design and advanced diagnostics capabilities. These make troubleshooting straightforward for technicians, ensuring that any required service is efficient and minimally disruptive.

In summary, the Trane 4TWB3 heat pump combines advanced features, superior technology, and outstanding performance. With its focus on energy efficiency, quiet operation, and durability, it is an excellent choice for homeowners seeking reliable heating and cooling solutions.
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