Trane ACONT900AC43UA User manual

Air Conditioning Procedures

Service Guide

Communicating Residential

Comfort Systems

First Edition

may be reproduced, in any form or by

any means, without permission in

writing from the publisher.

Produced and printed in the USA

A Comprehensive Reference for Service of Communicating

Residential Air Conditioning, Heat Pump & Gas Furnace Systems

1.0

Air Conditioning Procedures

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Trane Company

Attn: Loran Dailey

6200 Troup Hwy.

Tyler, TX 75707

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Pub# 034-3457-01

Air Conditioning Procedures

We appreciate your feedback.....

Name:

Address:

Email:

Phone#

Pub# 034-3457-01

Comments

We value your opinion. If you feel this service guide can be improved in some way, please

give us your thoughts. Simply email your opinion to [email protected]. You may also

write in the space below, tear out this page and mail it to:

Trane Company

Attn: Loran Dailey

6200 Troup Hwy.

Tyler, TX 75707

Cautions & Warnings

A 1

SAFETY HAZARD

THIS INFORMATION IS INTENDED FOR USE BY

INDIVIDUALS POSSESSING ADEQUATE BACKGROUNDS

OF ELECTRICAL AND MECHANICAL EXPERIENCE. ANY

ATTEMPT TO REPAIR A CENTRAL AIR CONDITIONING

PRODUCT MAY RESULT IN PERSONAL INJURY AND OR

PROPERTY DAMAGE. THE MANUFACTURER OR SELLER

CANNOT BE RESPONSIBLE FOR THE INTERPRETATION

OF THIS INFORMATION, NOR CAN IT ASSUME ANY

LIABILITY IN CONNECTION WITH ITS USE.

WARNING

!

WARNING

!

WARNING

!

WARNING

!

WARNING

!

WARNING

FIRE OR EXPLOSION HAZARD

FAILURE TO FOLLOW THE SAFETY WARNINGS EXACTLY

COULD RESULT IN SERIOUS PERSONAL INJURY, PROPERTY

DAMAGE, OR DEATH. IMPROPER SERVICING COULD RESULT

IN DANGEROUS OPERATION, SERIOUS PERSONAL INJURY ,

PROPERTY DAMAGE, OR DEATH.

SERVICE PROCEDURES HAZARD

BODILY INJURY CAN RESULT FROM HIGH VOLTAGE

ELECTRICAL COMPONENTS, FAST MOVING FANS, AND

COMBUSTIBLE GAS. FOR PROTECTION FROM THESE

INHERENT HAZARDS DURING INSTALLATION AND

SERVICING, THE ELECTRICAL SUPPLY MUST BE

DISCONNECTED AND THE MAIN GAS VALVE MUST BE

TURNED OFF. IF OPERATING CHECKS MUST BE PERFORMED

WITH THE UNIT OPERATING, IT IS THE TECHNICIAN’S

RESPONSIBILITY TO RECOGNIZE THESE HAZARDS AND

PROCEED SAFELY.

Throughout this manual there are procedures where voltage may be

present and gas or refrigerant system checks may be required. Read all

cautions and warnings on this page before proceeding.

Voltage Hazard

Disconnect power to the unit before removing the

blower door. Allow a minimum of 10 seconds for IFC

power supply to discharge to 0 volts. Failure to follow

this warning could result in property damage, personal

injury or death.

CARBON MONOXIDE POISONING HAZARD

FAILURE TO FOLLOW THE SERVICE AND/ OR PERIODIC

MAINTENANCE INSTRUCTIONS FOR THE FURNACE AND

VENTING SYSTEM, COULD RESULT IN CARBON MONOXIDE

POISONING OR DEATH.

!

WARNING

FIRE OR EXPLOSION HAZARD

SHOULD OVERHEATING OCCUR, OR THE GAS SUPPLY FAIL

TO SHUT OFF, SHUT OFF THE GAS VALVE TO THE UNIT

BEFORE SHUTTING OFF THE ELECTRICAL SUPPLY. FAILURE

TO FOLLOW THIS WARNING COULD RESULT IN PROPERTY

DAMAGE, PERSONAL INJURY, OR DEATH.

!

CAUTION

Safety Hazard

Sharp Edge Hazard

Be careful of sharp edges on equipment or any cuts

made on sheet metal while installing or servicing.

Personal injury may result.

Where there is no complete return duct system, the

return connection must be run full size from the furnace

to a location outside the utility room, basement, attic,

or crawl space.

Do NOT install return air through the back of the furnace

cabinet.

Do NOT install return air through the side of the furnace cabinet

on horizontal applications.

NOTE: Minimum return air temperature is 55°F.

!

CAUTION

CONTAINS REFRIGERANT!

SYSTEM CONTAINS OIL AND REFRIGERANT UNDER HIGH

PRESSURE. RECOVER REFRIGERANT TO RELIEVE

PRESSURE BEFORE OPENING SYSTEM.

Failure to follow proper procedures can result in

personal illness or injury or severe equipment damage.

LABELING WIRES!

LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN

SERVICING CONTROLS. WIRING ERRORS CAN CAUSE

IMPROPER AND DANGEROUS OPERATION. VERIFY PROPER

OPERATION AFTER SERVICING.

!

CAUTION

!

CAUTION

BURN HAZARD

DO NOT TOUCH IGNITER. IT IS EXTREMELY HOT.

Cautions & Warnings

A 2

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(A/T)CONT900AC43UA Installer Guide

4 Heat/3 Cool/ Heat Pump

Communicating Programmable 3-Wire Hookup

Introduction........................................................................................................................................ 3

Product specifications ................................................................................................................... 3

Installation.......................................................................................................................................... 3

When installing this product .......................................................................................................... 3

Location......................................................................................................................................... 4

Selecting Comfort Control location ............................................................................................... 4

Sub-base installation ..................................................................................................................... 4

Wiring............................................................................................................................................ 5

Mounting Comfort Control on sub-base......................................................................................... 6

Initial power-up .................................................................................................................................. 6

Power-up sequence ....................................................................................................................... 6

Discovery mode ............................................................................................................................ 6

Communicating indoor unit - Communicating outdoor unit ........................................................... 7

Communicating indoor unit - Single stage cooling unit ................................................................. 7

Adjusting real time clock .................................................................................................................. 7

Setting calendar and time ............................................................................................................. 7

Installer setup (ISU) ........................................................................................................................... 8

Entering installer setup.................................................................................................................. 8

Operation: Using the Comfort Control .......................................................................................... 18

System and fan settings .............................................................................................................. 18

Fan settings................................................................................................................................. 18

LED indication ............................................................................................................................. 18

Filter indication............................................................................................................................ 18

Pre-programmed ......................................................................................................................... 18

Alert code numbers ..................................................................................................................... 18

Equipment damage hazard. Minimum compressor off-time is bypassed during installer

System test ..................................................................................................................................19

System checkout ............................................................................................................................. 19

Installer system test..................................................................................................................... 19

Advanced features........................................................................................................................... 19

Adjustable continuous air flow..................................................................................................... 19

Control response rate .................................................................................................................. 20

Cycle rate .................................................................................................................................... 20

Auto changeover ......................................................................................................................... 20

Communicating Controller

Section A

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Communicating Programmable 3-Wire Hookup

(A/T)CONT900AC43UA Installer Guide

Setpoint deadband ...................................................................................................................... 21

Backlit display ............................................................................................................................. 21

Filter reminders ........................................................................................................................... 21

Fan selections ............................................................................................................................. 21

Screen locked.............................................................................................................................. 21

Installer system tests ................................................................................................................... 21

Default factory settings................................................................................................................ 21

Wait indicator .............................................................................................................................. 22

Calibrate indoor temperature....................................................................................................... 22

Calibrate outdoor temperature .................................................................................................... 22

Outdoor temperature sensor ....................................................................................................... 22

Humidification.................................................................................................................................. 22

Indoor humidification control ....................................................................................................... 22

Frost control ................................................................................................................................ 22

Dehumidification ............................................................................................................................. 22

Integrated temperature and humidity control (ITHC)................................................................... 22

Droop ............................................................................................................................................23

Comfort-R™ delay .........................................................................................................................23

Dehumidification airflow .................................................................................................................23

Proprietary humidity control...........................................................................................................23

Special heat pump features ............................................................................................................ 23

Auxiliary heat lockout temperature..............................................................................................23

Compressor heat lockout temperature ........................................................................................ 23

Operation in heat mode............................................................................................................... 24

Defrost heater balance point control ........................................................................................... 24

Operation in emergency heat mode ............................................................................................ 24

Heat pump with fossil fuel heat (dual fuel) and outdoor temperature sensor .............................. 24

Troubleshooting guide ................................................................................................................... 25

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(A/T)CONT900AC43UA Installer Guide

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Communicating Programmable 3-Wire Hookup

Table 1

Introduction

The (A/T)CONT900AC43UA is a communicating pro-

grammable Comfort Control (See Table 1) that sup-

ports single-stage or multi-stage heat/cool and heat

pump applications. It is a wall mounted, low voltage

(24VAC) communicating Comfort Control with backlit

LCD and a touch screen display. Room temperature

is maintained by controlling the operation of heating,

cooling, heat pump, and dual fuel systems via digital,

two-way communications. The Comfort Control will

communicate with and identify all ComfortLink™ II com-

ponents in the system. It is easily manually config-

ured via the user friendly Installer Setup menu. The

Comfort Control feature includes separate heating and

cooling setpoints, selectable auto or manual

changeover, menu driven 7-day programming, adjust-

able filter reminders, and outdoor temperature sens-

ing. Setup selections and diagnostics are stored in-

definitely in the Comfort Control’s nonvolatile memory,

eliminating the need for battery backup.

Product specifications

Power source: 18-30 VAC, Class II, 50/60 Hz

Storage range: -30°F to 150°F, 5% to 90% RH non-

condensing

Operating temperature range: 0°F to 120°F, 5% to

90% RH non-condensing

System mode: Heat, Cool, Auto, Emergency Heat,

and Off

Fan mode: On, Auto and Circ

Cooling setpoint temperature range: 60°F to 99°F,

1°F resolution

Heating setpoint temperature range: 50°F to 90°F,

1°F resolution

Indoor temperature display range: 40°F to 99°F,

Outdoor temperature display range: -40°F to 127°F

Indoor humidity display range: 0% to 99%, 1% reso-

lution

Minimum cycle off time delay: Compressor, 5 min-

utes. Heat, 0 minutes.

The comfort control contains a Lithium battery which

may contain Perchlorate material.

Due to State Law in California, the following statement

is required:

Perchlorate Material-special handling may apply. See

www.dtsc.ca.gov/hazardouswaste/perchlorate

Installation

When installing this product

Step 1

Read these instructions carefully. Failure to follow

these instructions may damage the product or cause

a hazardous condition.

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(A/T)CONT900AC43UA Installer Guide

Step 2

Check the ratings given in the instructions and on

the product to make sure the product is suitable for

your application.

Step 3

Installer must be a trained, experienced service tech-

nician.

Step 4

After completing installation, use these instructions

to check out the product operation.

WARNING

Voltage Hazard. Can cause electrical shock or

equipment damage. Disconnect power before

beginning instructions.

Figure 1

Selecting Comfort Control location

Do not install the Comfort Control where it can be

affected by

• Drafts or dead spots behind doors and in

corners.

• Hot or cold air from ducts.

• Radiant heat from sun or appliances.

• Concealed pipes and chimneys.

• Unheated (uncooled) areas such as an outside

wall behind the Comfort Control.

Sub-base installation

The Comfort Control can be mounted horizontally

on the wall or on a two inch by four inch wiring box.

Position sub-base horizontally on the wall or on a two

inch by four inch wiring box.

Step 1

Turn OFF all power to heating and cooling equip-

ment.

Step 2

If an existing Comfort Control is being replaced:

a.)Remove existing Comfort Control from the wall.

b.)Disconnect wires from existing control, one at

a time. Be careful not to allow wires to fall back

into wall.

c.) As each wire is disconnected, record wire color

and terminal marking.

d.)Discard or recycle old Comfort Control.

Step 3

Separate the Comfort Control from the sub-base to

expose mounting holes.

Step 4

Position and level the sub-base wallplate (for appear-

ance only.) The Comfort Control functions properly

even when not level.

Location

Install the Comfort Control about five feet (1.5m)

above the floor in an area with good circulation at

average temperature (See Figure 1.)

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Communicating Programmable 3-Wire Hookup

Step 5

Use a pencil to mark the mounting holes.

Step 6

Remove the sub-base from the wall and drill two 3/

16” holes in the wall (if drywall) as marked.

For firmer material such as plaster, drill two 7/32” holes.

Gently tap anchors (provided) into the drilled holes until

flush with the wall.

Step 7

Position the sub-base over the holes, pulling the wires

through the wiring opening.

Step 8

Insert the mounting screws in the holes and tighten.

Wiring

All wiring must comply with local electrical codes and

ordinances. See Figures 2 and 3 wiring diagrams

for specific equipment applications. Refer to Table

2 for terminal designations.

Figure 2

Field wiring diagram, Communicating indoor unit - Communicating outdoor unit

Figure 3

Field wiring diagram, Communicating indoor unit - Single stage cooling unit

WARNING

Voltage Hazard. Can cause electrical shock or

equipment damage. Disconnect power before

beginning instructions.

Note:

The maximum cable length for the entire Comfort Control com-

municating system is 500 feet 18 AWG. The maximum dis-

tance of any single cable from a transformer is 250 feet 18

AWG.

Table 2

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TCONT900AC43UA Installer’s Guide

4 Heat/3 Cool/ Heat Pump

Communicating Programmable 3-Wire Hookup

(A/T)CONT900AC43UA Installer Guide

Step 1

Loosen the terminal screws on the sub-base. Insert

wires into the terminal block next to the loosened

screw (See Figure 4.)

Figure 4

Step 2

Securely tighten each terminal screw.

Step 3

Push excess wire back in the hole.

Step 4

Plug the hole in the wall with nonflammable insulation

to help prevent drafts from adversely affecting Comfort

Control operation.

Mounting Comfort Control on sub-base

Step 1

Align the terminal screw block with the pins on the

back of the Comfort Control.

Step 2

Push the Comfort Control straight onto the wallplate

(See Figure 4.)

Step 3

Perform installation of all other system equipment.

Step 4

Turn ON power to the heating and cooling equip-

ment.

Initial power-up

Power-up sequence

The communicating Comfort Control will communicate

and identify all communicating components in the sys-

tem.

Discovery mode

Discovery mode begins when the communicating Com-

fort Control is first installed and power is connected.

For communicating equipment, the Comfort Control

automatically configures the equipment type, number

of stages, cycle rates for each stage and compressor

stage ratios based on the information it received dur-

ing Discovery mode.

While in Discovery mode, the LED indicator located

in the upper right corner of the Comfort Control will

be illuminated.

All discovered values will be saved into memory. If

a communicating device goes missing (Err 89) or

changes in value (Err 126) the error will be broad-

cast to the Comfort Control screen (restoring com-

munications will clear this error or see ISU 0706 to

reset the system configuration.)

The communicating Comfort Control can be reset

(ISU 0710) to factory default settings.

Note: ISU 0706 Will force a reinitialization without af-

fecting presets. ISU 0710 will reset everything includ-

ing custom programs and presets.

Important: Use 18-gauge color-coded Comfort Control cable for proper

wiring. Shielded cable is not typically required. Keep this wiring at least

one foot away from large inductive loads such as Electronic Air Cleaners,

motors, line starters, lighting ballasts, and large distribution panels. Failure

to follow there wiring practices may introduce electrical interference (noise)

which can cause erratic system operation. All unused Comfort Control wire

to be grounded at indoor unit chassis ground only. Shielded cable may be

required if the above wiring guidelines cannot be met. Ground the shield

only to the system chassis.

C - A 7

(A/T)CONT900AC43UA Installer Guide

4 Heat/3 Cool/ Heat Pump

Communicating Programmable 3-Wire Hookup

If no equipment is connected during the Auto-Discov-

ery process, the system mode will be stuck at “OFF”

and no equipment will run.

To change the default/discovery settings, enter the in-

staller Setup menu (See Table 4, Pages 9-17) and

select the desired item.

Only ISU settings with an “E” will be Auto-Discovered.

Manually changing an ISU setting to an option other

than “E” disables Discovery mode for that ISU setting.

See Table 3 for default cycle rate settings.

Table 3

Communicating indoor unit - Communicating

outdoor unit

For a fully communicating system, the communicat-

ing Comfort Control will automatically configure the

indoor and outdoor equipment configuration and cycle

rates for each stage (See Figure 2.)

Communicating indoor unit - Single stage

cooling unit

For a partially communicating system, the commu-

nicating Comfort Control will automatically config-

ure the indoor equipment configuration and cycle

rates for each stage (See Figure 3.)

The outdoor equipment configuration will default to

a single stage cooling unit.

Adjusting real time clock

Setting calendar and time

Locate and remove the tab labeled “Remove” in the

lower left corner of the Comfort Control back. The

tab must be removed to activate the real time clock.

(See Figure 5.)

Figure 5

If the system is not powered, the real time clock bat-

tery life is approximately 20 weeks.

The Comfort Control is designed to automatically

keep the current time and day in memory for up to

ten years under normal use once calendar is set.

When the Comfort Control is powered, the display is

ready for the calendar date to be entered (See Fig-

ure 6, next page)

Note: Clock accuracy is +/- 1 minute per month

C - A 8

TCONT900AC43UA Installer’s Guide

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Communicating Programmable 3-Wire Hookup

(A/T)CONT900AC43UA Installer Guide

Figure 6

Installer setup (ISU)

The Comfort Control works with many different sys-

tem types. The installer can use the Installer Setup

menu to change factory settings to customize instal-

lations (See Table 4.)

Entering installer setup

Follow these steps to enter the Installer Setup:

Step 1

Be sure the Comfort Control is powered. If neces-

sary, press the Done key to return to the home screen.

Step 2

Press and release the system key.

Step 3

Press and hold the two blank keys on either side of

the center key for approximately five seconds until

screen changes (See Figure 7.)

Step 4

Release the two blank keys when the screen on the

Comfort Control matches the screen in Figure 8 (See

Figure 8.)

Figure 7

Figure 8

Step 5

See Figure 8 to review how the Comfort Control keys

are used during Installer Setup (See Table 4, Pages

9-17) for the Installer Setup numbers and settings.

C - A 9

(A/T)CONT900AC43UA Installer Guide

4 Heat/3 Cool/ Heat Pump

Communicating Programmable 3-Wire Hookup

Note:

Manually changing an ISU setting to an option other than “E”

disables Discovery mode for that ISU setting. If power is lost,

all custom settings are retained in the memory.

Step 6

Press the Done key to exit the Installer Setup.

Table 4. Installer Setup Menu.

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4 Heat/3 Cool/ Heat Pump

Communicating Programmable 3-Wire Hookup

(A/T)CONT900AC43UA Installer Guide

Table 4. Installer Setup Menu Continued.

No humidity option available if 3 is

selected

Note: If single stage is configured, ODU will run Low Stage,

but ID airflow ill be 100%. If 3-Three Stage is configured,

there will be an Err 89 on stat but unit will run.

For 3 stage furnace:

Option 1 = High stage heat only

Option 2 = Medium and high stage heat only

For modulating furnace:

Option 1 = High stage heat

Option 2= Modulating

Option 3 = 40% or 100% - No modulation

Note: If anything else is configured, other than

“E1”, then the blower will not run in cooling with

a furnace but continuous fan and heat will op-

erate blower okay/

Note: Auto discovered low stage airflow for 20

SEER:

2 Ton = 50%

3 Ton = 55%

4 Ton = 50%

5 Ton = 65%

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(A/T)CONT900AC43UA Installer Guide

4 Heat/3 Cool/ Heat Pump

Communicating Programmable 3-Wire Hookup

Table 4. Installer Setup Menu Continued.

Note: E1 = Auto discovered w/com ODU

E0 = Auto discovered w/o com ODU

C - A 12

TCONT900AC43UA Installer’s Guide

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Communicating Programmable 3-Wire Hookup

(A/T)CONT900AC43UA Installer Guide

Table 4. Installer Setup Menu Continued.

Note: Y2 counter only with Phase 2 product (serial date

code 0904) if heat demand is satisfied by Y2 - reset timer

HP with EH = 0 (no lockout)

Dual Fuel = 40 degrees default

(Range is 5 - 60)

Note: “0” is not an option with Dual Fuel (must

have a lockout temp configured)

Dual Fuel = 50 degrees default

Must have option 2 selected in

ISU0350.

(Range is 45-65 with 40 degree de-

fault is selected in ISU0350). (A 5 de-

gree deadband is enforced between

comp lockout and aux heat lockout)

Note: Watch for cool air complaints during de-

frost if aux heat lockout is configured. Also be

aware of ISU0361, 362 and 363.

Note: For phase 2 factory

setting = 0 - disabled.

(phase 2 = serial data code 0904)

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