Trane ComfortLink 4TWZ0024A1000A User manual

4TWZ0024-SF-1C
ComfortLink™II System
Heat Pump
4TWZ0024A1000A
4TWZ0024A1000A
200/230/1/60
14
20
20
CLIMATUFF®
2 - 1
200/230/1/60
8.7 - 58
YES
YES
YES
PROPELLER
27.6 - 1
DIRECT - 2
3390/2270
1 - 1/3
759/493
200/230/1/60
2.80
SPINE FIN™
1 - 24
30.79
3/8
EEV
R-410A
10 LBS.- 1 OZ.
YES
5/8
3/8
See Charging Chart (page 3)
H X W X D
57.4 X 35.1 X 38.7
390
340
20’
30’
40’
50’
60’
70’
80’
5/8”
5/8”
5/8”
5/8”
5/8”
5/8”
5/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3 oz.
8 oz.
14 oz.
20 oz.
25 oz.
31 oz.
37 oz.
© 2009 Trane
IMPORTANT — This document contains a wiring diagram, a parts list, and service information. This is customer prop-
erty and is to remain with this unit. Please return to service information pack upon completion of work.
PRODUCT SPECIFICATIONS
OUTDOOR UNIT 12
POWER CONNS. — V/PH/HZ 3
MIN. BRCH. CIR. AMPACITY
BR. CIR. MAX. (AMPS)
PROT. RTG. }MIN. (AMPS)
COMPRESSOR
NO. USED - NO. SPEEDS
VOLTS/PH/HZ
R.L. AMPS 7- L.R. AMPS
FACTORY INSTALLED
START COMPONENTS 8
INSULATION/SOUND BLANKET
COMPRESSOR HEAT
OUTDOOR FAN
DIA. (IN.) - NO. USED
TYPE DRIVE - NO. SPEEDS
CFM @ 0.0 IN. W.G. 4(HIGH/LOW)
NO. MOTORS - HP
MOTOR R.P.M. (HIGH/LOW)
VOLTS/PH/HZ
F.L. AMPS
OUTDOOR COIL — TYPE
ROWS - F.P.I.
FACE AREA (SQ. FT.)
TUBE SIZE (IN.)
REFRIGERANT CONTROL
REFRIGERANT
LBS. — R-410A (O.D. UNIT) 5
FACTORY SUPPLIED
LINE SIZE - IN. O.D. GAS 6
LINE SIZE - IN. O.D. LIQ. 6
CHARGING SPECIFICATION
SUBCOOLING
DIMENSIONS
CRATED (IN.)
WEIGHT
SHIPPING (LBS.)
NET (LBS.)
Service Facts
NOTICE: The manufacturer has a policy of continuous product and product data improvement
and reserves the right to change design and specifications without notice.
WARNING
!
THIS INFORMATION IS INTENDED FOR USE BY INDIVIDUALS POSSES-
SING ADEQUATE BACKGROUNDS OF ELECTRICAL AND MECHANICAL
EXPERIENCE. ANY ATTEMPT TO REPAIR A CENTRAL AIR CONDITION-
ING PRODUCT MAY RESULT IN PERSONAL INJURY AND OR PROPERTY
DAMAGE. THE MANUFACTURER OR SELLER CANNOT BE RESPON-
SIBLE FOR THE INTERPRETATION OF THIS INFORMATION, NOR CAN IT
ASSUME ANY LIABILITY IN CONNECTION WITH ITS USE.
CAUTION
!
RECONNECT ALL GROUNDING DEVICES.
ALL PARTS OF THIS PRODUCT CAPABLE OF CONDUCTING
ELECTRICAL CURRENT ARE GROUNDED. IF GROUNDING WIRES,
SCREWS, STRAPS, CLIPS, NUTS OR WASHERS USED TO COMPLETE
A PATH TO GROUND ARE REMOVED FOR SERVICE, THEY MUST
BE RETURNED TO THEIR ORIGINAL POSITION AND PROPERLY
FASTENED.
WARNING:
HAZARDOUS VOLTAGE - DISCONNECT POWER and DISCHARGE
CAPACITORS BEFORE SERVICING
CAUTION
!
UNIT CONTAINS R-410A REFRIGERANT!
R-410A OPERATING PRESSURE EXCEEDS THE
LIMIT OF R-22. PROPER SERVICE EQUIPMENT IS
REQUIRED. FAILURE TO USE PROPER SERVICE
TOOLS MAY RESULT IN EQUIPMENT DAMAGE OR
PERSONAL INJURY.
SERVICE
USE ONLY R-410A REFRIGERANT AND
APPROVED POE/AB COMPRESSOR OIL.
TUBING INFORMATION
Tubing Sizes Tubing Additional
Suction Liquid Length Refrigerant
Tubing lengths in excess of eighty (80) feet see application software.
03/09
1Certified in accordance with the Air-Source Unitary Air-conditioner Equipment certi-
fication program, which is based on ARI standard 210/240. In order to achieve ARI
standard rating, the indoor fan time delay on the comfort control must be enabled.
2Rated in accordance with ARI standard 270.
3Calculated in accordance with Natl. Elec. Codes. Use only HACR circuit breakers or
fuses.
4Standard Air — Dry Coil — Outdoor
5This value approximate. For more precise value see unit nameplate.
6Max. linear length 80 ft.; Max. lift - Suction 25 ft.; Max lift - Liquid 25 ft.
For greater length consult refrigerant piping software Pub. No. 32-3312-0*
(* denotes latest revision).
7This value shown for compressor RLA on the unit nameplate and on this specification
sheet is used to compute minimum branch circuit ampacity and max. fuse size. The
value shown is the branch circuit selection current.
8NO means no start components. YES means quick start kit components. PTC means
positive temperature coefficient starter.
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.
CAUTION
!

4TWZ0024A1000A
SUBCOOL CHARGING TABLE CORRECTIONS FOR LINE LENGTH AND RISE
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
Dip Switch 1- ON
Dip Switch 2-ON
Max Lift
25
20
15
10
0
10 20 25 30 40 60 80
Dip Switch 3-ON
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
Max Lift
25
20
15
10
0
10 20 25 30 40 60 80
TABLE A TABLE B
These
matches
ONLY
4TXCB003 Coil Downflow & Horizontal Right Only
4TXCC006 Coil Downflow & Horizontal Right Only
4TEE3_03 Air Handler Downflow & Horizontal Left Only
All other approved, matched systems.
CHARGING METHOD
This model has ComfortLink™ II and Charge Assist™
features. Charge Assist™ can be used in cooling mode
only.
For complete instructions on using Charge Assist,™
please see page 4.
2
SCHEMATIC DIAGRAM
MANUAL CHARGING BELOW 55°F OD AMBIENT –
IN HEATING MODE (HP MODELS ONLY)
1. The only recommended method of charging at outdoor
ambients below 55°F, is to weigh in the charge in the heat-
ing mode.
2. Check liquid line temperature and pressure (at the OD
valves) to obtain a minimum of 10°F subcooling.
3. It is important to return in the spring or summer to accu-
rately charge the system in the cooling mode at outdoor
ambients from 55°F-120°F.

DWG. NO. 4TWZ0024-SF-1C
ONLY DIPSWITCH
1 ON
ONLY DIPSWITCH
2 ON
ONLY DIPSWITCH
3 ON
SEE TABLE A
PAGE 2 *
SEE TABLE A
PAGE 2
SEE TABLE B
PAGE 2 **
55 192 199 210
60 206 213 227
65 221 229 245
70 238 246 264
75 256 264 284
80 275 284 306
85 295 305 329
90 316 327 354
95 339 350 380
100 363 374 407
105 388 400 435
110 415 427 465
115 443 456 497
120 471 485 529
125 502 516 563
PRINTED FROM D155859P01 REV 4
** Data is based on 18.0° of subcooling at a 95° ambient
2 TON HP R410A REFRIGERANT CHARGING CHART
Liquid
Tem
p
(
°F
)
LIQUID GAGE PRESSURE (PSIG)
* Data is based on 9.5° of subcooling at a 95° ambient
3
WIRING DIAGRAM
MANUAL CHARGING OR CHARGE ASSISTTM METHOD IN
COOLING BETWEEN 55°F AND 120°F OD AMBIENT
It is recommended to install manufacturer approved matched indoor and
outdoor systems.
All approved split systems are ARI rated with only TXV indoor systems.
The benefits of installing approved indoor and outdoor split systems are
maximum efficiency, optimum performance and the best overall system
reliability. The following charging methods are therefore prescribed for
matched systems with indoor TXVs.
1. Subcooling using the R-410A Refrigerant Charging Chart (in the cooling
mode) is the only recommended method of charging between 55°F and
120°F ambient temperatures.
2. When charging for ambient temperatures above 120°F, charge to 10°
subcooling. It is important to return when outdoor ambient temperature
is between 55°F and 120°F to verify system charge per these instruc-
tions.
3. For best results – the indoor temperature should be kept between 70°F
to 80°F. Add system heat if needed.
4. At startup, or whenever charge is removed or added, the system must
be operated for a minimum twenty (20) minutes to stabilize before
accurate measurements can be made. (Feature of Charge Assist™)
5. Measure Liquid Line Temperature and Refrigerant Pressure at service
valves. (Not required with Charge Assist.™)
6. Determine total refrigerant line length, and height (lift) if indoor section is above the condenser. Set dip switches on Charge Assist™ board as
indicated in the Subcool Charging Corrections Table on page 2 .
7. Locate your liquid line temperature in the left column of the table, and the intersecting liquid line gage pressure under the DIPSWITCH selection
column. Add refrigerant to raise the pressure to match the table, or remove refrigerant to lower the pressure. For manual charging, always wait twen-
ty (20) minutes for the system conditions to stabilize before adjusting charge again. (Not required with Charge Assist.™)
8. Charge Assist port is designed for liquid refrigerant charging.
9. When system is correctly charged, you can refer to System Pressure Curves (on page 8) to verify typical performance.

4
NOTE: On the Charge Assist™ control set the LINE LENGTH
DIP SWITCHES before running system or entering CA Mode.
See Subcool Charging Corrections Table on page 2.
The Communicating Comfort Control will auto-configure the
system size and airflow requirement at power-up. The Charge
Assist™ (CA) Mode will set the indoor blower to 100%, over-
ride any blower delays and run compressor 2nd stage. (Green
LEDs Y1 and Y2 will be on. The Green Status LED will be
turned off.)
Procedure
STEP 1:
Press MODE button (See Figure 2) for 2 seconds to enter
the CA mode. The CA control takes control of the system
and overrides the Communicating Comfort Control. The
Green STATUS LED is turned OFF. The CA control will
run the first stage compressor for one minute. Green LED
Y1 is on. The CA control will then run the second stage
compressor. Green LEDs Y1 and Y2 will then be ON. The
CA control now starts its Charge Assist™ mode. The CA
control will now check the operating Conditions before
continuing the CA Mode.
NOTE: To stop the CA mode at anytime, press the MODE
button. The CA control will then begin slowly flashing its
Green STATUS LED indicating that the CA control is now
in its normal operating mode.
Outdoor Temperature (ODT) Must be between 55°F and
120°F. If ODT is below 55°F or above 120°F, the ODT,
OUT OF RANGE, Red LED will flash ON and OFF for 30
seconds. This error condition causes the CHARGING
(STABILIZING) Amber LED to flash 10 times. The CA
control will then exit the CA mode and the Green Status
LED begins to flash slowly.
Liquid Line Temperature (Must be within range) If this
sensor is shorted or open - This error condition causes an
11 flash on FAULT LED.
Liquid Line Pressure (Must be above 90 psig) If the liquid
pressure is below 90 psig, the LOW PRESSURE Red LED
will turn on for 30 seconds. This error condition causes the
CA control to flash its CHARGING (STABILIZING) Amber
LED 10 times. The CA control will then exit the CA mode
and it then begins flashing its Green Status LED slowly.
STEP 2:
Enter Stabilization Routine The CHARGING (STABILIZ-
ING) Amber LED will begin to flash.
The CA control will then indicate the time it will take for the
refrigerant system to stabilize by flashing its CHARGING
(STABILIZING) Amber LED. (See SUMMARY on page 7
for flash rate details.)
The CA control may run the system for up to twenty min-
utes to insure the refrigerant system is at a steady operat-
ing state. Once the system is at a steady operating state
the CA control will enter the Charging Routine.
STEP 3:
Charge Assist™ (CA) Procedure with a Communicating Comfort Control
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.
CAUTION
!
WARNING
!
Live Electrical Components!
During installation, testing, servicing and troubleshooting of
this product, it may be necessary to work with live electrical
components. Failure to follow all electrical safety precautions
when exposed to live electrical components could result in
death or serious injury.
2chargE assisttM
circuit board dEtail
1chargE assisttM
Port locatioN
liQuid
rEfrigEraNt

5
RECOVER Routine
If the CA control determines there is excessive refrigerant
in the system, the REC Red LED will be turned ON. The
CA control will lock the system off for one hour and it will
then exit the CA cycle. The REC Red LED will stay ON for
1 hour. The CA control lock out period can be stopped by
pressing the MODE button for 2 seconds. Status LED will
be off during lockout.
NOTE: Personality Module (PM) contains model specific
information needed for system operation - Do Not Re-
move.
NOTE: The word ‘Wait’will be displayed on the Commu-
nicating Comfort Control when the system is in the CA
mode. The Communicating Comfort Control does not
control the system operation when the system is running
in the CA Mode. Any changes in the Communicating
Comfort Control programming made during the CA mode
of operation will become effective after the CA mode ends.
NOTE: Charge Assist™ IS NOT allowed when a heat
pump is operating in the heating cycle. If the mode but-
ton is pressed during an active compressor heat call,
the CHARGING (STABILIZING) LED will flash 10 times
indicating that CA is not allowed. Once an active call for
compressor heat has ended, CA may be entered.
CAUTION: Minimum equipment off time is bypassed dur-
ing Charge Assist™. Avoid cycling compressor quickly.
Observe the recommended 5-minute minimum off time for
compressor protection.
CHARGING Routine
Charge Assist™ will follow one of the following routines.
STEP 4:
CHARGED Routine
IF the CA control determines the system is correctly
charged, the CHARGING (STABILIZING) Amber LED will
be turned OFF and the CHARGED Green LED will be
turned ON.
The CA control will then exit the charge assist cycle and
return the control of the system to the Communicating
Comfort Control. The Status Green LED will be slowly
flashing. The CHARGED Green LED will stay ON for 1
hour.
STEP 5:
ADD Routine If the CA control determines refrigerant
is required, the ADD Amber LED will turn ON and the
Green CHARGED LED will begin FLASHING according
to the CHARGED Green LED flash Rate Schedule.
(See SUMMARY on page 7 for flash rate details.)
NOTE: For Automated charging, use BAYCAKT001AA.
When utilizing a Charging accessory Solenoid Kit (BAY-
CAKT001-shown in Figure 3) refer to the instructions
in the kit (18-HH15D1-*) for proper hook up. When the
Amber ADD LED is ON the CA control board provides a
24 VAC power for the accessory solenoid. The CA control
will turn off the 24 VAC power when the Amber ADD LED
goes off.
When refrigerant is being added, the CA control will exit
the Charge Assist™ cycle if the liquid line pressure does
not increase by 4 psi in 50 minutes or if the liquid line
pressure does not get within the 20 psi of the required
charged pressure within 1 hour.
Note: For Manual Charging
Once sufficient charge has been added, the Amber ADD
LED will turn OFF and the Green CHARGED LED will be
turned ON. When the Amber ADD LED turns OFF; stop
adding refrigerant. The Green CHARGED LED will stay
on for 5 minutes while the unit runs. The CA control will
now exit the Charge Assist™ cycle and returns control to
the Communicating Comfort Control.
STEP 6:
3Charge Assist™ Solenoid Kit
BAYCAKT001
Use for Auto Charging
(See Installer’s Guide 18-HH15D1-*)
STABILIZING
LED
CHARGED
LED
ADD
LED
REC
LED
CHARGED
Routine
(See Step 4)
OFF ON OFF OFF
ADD
Routine
(See Step 5)
OFF Flashing ON OFF
RECOVER
Routine
(See Step 6)
OFF OFF OFF ON

6
SUMMARY OF ALERT CODE & CHARGE ASSISTTM LEDS
Charge Assist™ (CA) Procedure for a NON-Communicating
24VAC Control System
STEP 3:
Press the mode button on the CA board and follow the CA
procedures starting with STEP 1 in the Communicating
Comfort Control Section above.
STEP 4:
After the CA control exits the CA mode CYCLE, the tech-
nician must then return the
NON-COMMUNICATING 24 volt indoor CONTROL to the
desired customer setting.
STEP 1:
Outdoor units coupled with 24 volt indoor units (outdoor
units require BAYACHP024* for 24V operation) require the
technician to set up the Variable Speed (VS) Air Handler
or VS Furnace with the DIP switches for the size of the
equipment installed. (Unit tonnage, CFM per ton 350,
400, 450 required, the blower delays and Heating airflow)
CA cycle is compatible with ENHANCED Mode.
STEP 2:
A technician must set the indoor system control to call for
the SECOND STAGE of COOLING. The indoor CON-
TROL must be set low enough to ensure the system
continues to run in SECOND STAGE of COOLING
throughout the CA mode cycle. The CA control will exit
the CA mode CYCLE if the system control does not stay
in the SECOND STAGE cooling cycle. (The CA Control
must see 24 Volts AC call on both Y1 and Y2.)
LED
Colo
r
Fault LED Alert
Code Description Control Displa
y
LED
Colo
r
Description
90 Excessive Communication Errors N/A Flashing See Charging Flash Rate
Loss of Heat/Cool Demand Message
(COMM) Off Charged or not in CA Mode
Loss of Bit Master (Clock Signal) On Charge is Correct
2 Flash Defrost Fault A
Y
1On 1st stage compressor requests
3 Flash Defrost Fault B and/or C
Y
2On 2nd stage compressor request
4 Flash Defrost Fault A and [B and/or C] Fast Flash Initialization at Power Up ~ 60 seconds
5 Flash Ambient Temperature Sensor Fault
(Out of Range - Open or Shorted) Med Flash Oil Return Mode ** (Forced Defrost)
6 Flash Coil Temperature Sensor Fault
(Out of Range - Open or Shorted) Slow Flash Standard operation
Low Pressure Cut Out Fault (Open
outside of defrost Cycle-Hard lock out, cycle
power to reset)
Off Charge Assist™ mode or no power to control
Low Pressure Cut Out Fault
Heat/Cool Lock out LitePort Occasional Flash For transmitting LitePort TM data
Low Pressure Cut Out Fault (Open
outside of defrost Cycle-Short lock out) Wait ¤ Flashing
Flash device count when in communication
(number of COMM products connected in system);
Rapid flashes followed by a pause indicates
disrupted communications
10 Flash 102 Y2 without Y1 - Miswire
(24 volt mode only) N/A Off No power
11 Flash 67 Liquid Temperature Sensor Fault
(Out of Range - Open or Shorted) N/A On Solid at power-up
12 Flash 113 Liquid Pressure Sensor Fault
(Out of Range - Open or Shorted) ERR 113 Flashing See Stabilization Flash Rate
13 Flash 67
External Outdoor Temperature
Sensor Fault
(Out of Range - Shorted)
N/A Off Not in CA Mode
PM Missing with local copy
(Operational) ERR 114 ADD On System requires refrigerant charge (Control has 24 volt AC output to Charge Solenoid)
Bad Data in PM with local copy
(Operational) N/A
Ambient Temperature is out of range -
Ambient Temperature must be above 55°F
and below 120°F to enter CA Mode
Bad Data in PM no local copy
(Not Operational)
Note: ODT LED will flash 1 sec ON/OFF for 30
seconds and the CHARGING LED will flash 5 times per
second for 2 seconds, then exit CA.
PM Missing with no local copy
(Not Operational) RECOVER On
Need to recover refrigerant - Unit locked out
for 1 hour or press mode button to exit
Charge Assist™
15 Flash * 50 Duplicate OD Temperature Sensor * N/A
Liquid pressure below 90 psig - Liquid
pressure must be above 90 psig to enter CA
Mode
16 Flash * 123 Demand Configuration Fault * N/A
Note: LOW pressure LED will be on for 30 seconds
and the CHARGING LED will flash 5 times per second
for 2 seconds, then exit CA.
High Presure Monitor Fault
(Hard lock out, cycle power to reset) ERR 80 Notes: ** Used with 20 SEER Models
High Presure Monitor Fault
(Short lock out) Wait ¤
18 Flash 18 24V Sensing Error (24V Missing at Y1) ERR 18
N/A
ERR 79
ERR 67
Green
Charge Assist™ (CA) LEDs
Red
Notes:
On
Flashing
ERR 91
4 highest priority Faults display flash codes sequentially. 2 second pause between faults and 4 second pause between sequences. Cycle power to ODU to clear Faults.
* Alert flash code will not be implemented for initial release
¤ Wait icon will appear on the Comfort Control during: Equipment minimum off time, Charge Assist
TM, Short lock out (see Alert Codes "7 Flash" & "17 Flash")
CHARGED
17 Flash 80
LOW
ODT
Red
14 Flash 114
Amber
7 Flash 79
STATUS
COM
91
1 Flash
67
68
ERR 114
CHARGING
Printed from D802247P01 Rev08

7
FLASH RATE SUMMARY
SUMMARY OF ALERT CODE & CHARGE ASSISTTM LEDS (CONTINUED)
ON Charge is Correct
1 sec. ON/OFF = 15-20 PSI off target
3/4 sec. ON/OFF = 10-15 PSI off target
1/2 sec. ON/OFF = 5-10 PSI off target
1/4 sec. ON/OFF = 0-5 PSI off target
1 sec ON/OFF = 6-20 minutes away from a steady operating state.
3/4 sec. ON/OFF = 5-6 minutes away from a steady operating state.
1/2 sec. ON/OFF = 2-4 minutes away from a steady operating state.
1/4 sec. ON/OFF = 1/2 - 2 minutes away from a steady operating state.
Flash 10 times = indicates that Charge Assist™ is not allowed
ON Exit Charge Assist™ - need to recover refrigerant
ON System requires refrigerant charge (Control has turned on the 24 volt AC output) Use
Charge Assist™ Tool (#BAYCAKT001AA)
"ADD" (AMBER LED)
BLINKING
"CHARGING" (STABILIZING) (AMBER LED)
BLINKING
"RECOVER" (RED LED)
CA™ procedure allows 1 hour to get within 20 psi of "Charged" and 50 minutes to move 4 psi,
Otherwise Time Out
"CHARGED" LED (GREEN)
NOTES:
--
--
--
--
-
-
-
-
-
The Comfort Control Wait icon
will be ON for the following:
Minimum equipment off time (5 min.)
During Low or High Pressure monitor
"short lockout" (5 min)
During Power-Interrupt protection
(1 min.)
During Charge Assist™
A
working Ambient Temperature Sensor
is needed for the following:
Humidifier Dew-Point Control
Compressor Lock Out
Oil Return Mode
LPCO Monitor
Charge Assist (Use Ambient Sensor only) Do not revert to
External ODT Sensor if present and Ambient Sensor has failed.
Comfort Control (ODT display)
Aux Heat control during Defrost
Defrost (Heat Pump Models Only) Do not revert to External ODT
Sensor if present and Ambient Sensor has failed.
Aux Heat Lock Out

4TEE3C03A1 4TEE3C03A1
PRESSURE CURVES FOR 4TWZ0024A1000A UPFLOW & HORIZ. RIGHT
200
250
300
350
400
450
500
40 60 80 100 120
120
130
140
150
160
170
180
40 60 80 100 120
120
130
140
150
160
170
180
40 60 80 100 120
40
50
60
70
80
90
100
110
120
130
140
150
-5 5 15 25 35 45 55 65
150
200
250
300
350
400
450
-5 5 15 25 35 45 55 65
40
50
60
70
80
90
100
110
120
130
140
150
-5 5 15 25 35 45 55 65
150
200
250
300
350
400
450
-5 5 15 25 35 45 55 65
Heating with Thermal Expansion Valve
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM
80, 70, AND 60 DEG F.
200
250
300
350
400
450
500
40 60 80 100 120
Cooling with Thermal Expansion Valve
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM
80, 70, AND 60 DEG F.
OUTDOOR TEMPERATURE (Degree F)
DISCHARGE PRESSURE (PSIG)
SUCTION PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
2ND STAGE
2ND STAGE
1ST STAGE
1ST STAGE
2ND STAGE
2ND STAGE
1ST STAGE
1ST STAGE
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
4TEE3C03A1 4TEE3C03A1
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F.
TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB
TEMPERATURE, OUTDOOR TEMPERATURE, DISCHARGE AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1);
LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ DISCHARGE OR SUCTION PRESSURE IN LEFT
COLUMN (4).
EXAMPLE: (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION
ACTUAL:
(4) DISCHARGE PRESSURE @ 430 CFM IS 288 PSIG
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 845 CFM IS 149 PSIG
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES
GAS - 5/8" O.D.
LIQUID - 3/8" O.D.
DWG.NO.
4TWZ0024A1
PRESSURE CURVES FOR 4TWZ0024A100A DOWNFLOW & HORIZ. LEFT
200
250
300
350
400
450
500
550
40 60 80 100 120
125
135
145
155
165
175
185
40 60 80 100 120
125
135
145
155
165
175
185
40 60 80 100 120
40
50
60
70
80
90
100
110
120
130
140
150
160
-5 5 15 25 35 45 55 65
200
250
300
350
400
-5 5 15 25 35 45 55 65
40
50
60
70
80
90
100
110
120
130
140
150
160
-5 5 15 25 35 45 55 65
200
250
300
350
400
-5 5 15 25 35 45 55 65
Heating with Thermal Expansion Valve
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM
80, 70, AND 60 DEG F.
200
250
300
350
400
450
500
550
40 60 80 100 120
Cooling with Thermal Expansion Valve
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM
80, 70, AND 60 DEG F.
OUTDOOR TEMPERATURE (Degree F)
DISCHARGE PRESSURE (PSIG)
SUCTION PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
2ND STAGE
2ND STAGE
1ST STAGE
1ST STAGE
2ND STAGE
2ND STAGE
1ST STAGE
1ST STAGE
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
COOLING PERFORMANCE CAN BE
CHECKED WHEN THE OUTDOOR TEMP
IS ABOVE 65 DEG F.
TO CHECK COOLING PERFORMANCE,
SELECT THE PROPER INDOOR CFM,
ALLOW PRESSURES TO STABILIZE.
MEASURE INDOOR WET BULB
TEMPERATURE, OUTDOOR
TEMPERATURE, DISCHARGE AND
SUCTION PRESSURES. ON THE PLOTS
LOCATE OUTDOOR TEMPERATURE (1);
LOCATE INDOOR WET BULB (2); FIND
INTERSECTION OF OD TEMP. & ID W.B.
(3); READ DISCHARGE OR SUCTION
PRESSURE IN LEFT COLUMN (4).
EXAMPLE:
(1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION
(4) DISCHARGE PRESSURE
@ 430 CFM IS 288 PSIG.
(5) SUCTION PRESSURE
@ 845 CFM IS 149 PSIG.
DISCHARGE PRESSURE SHOULD BE
+/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE
+/- 3 PSIG OF CHART
INTERCONNECTING LINES
GAS - 5/8" O.D.
LIQUID - 3/8" O.D.
DWG. NO. 4TWZ0024A1
Heating Refrigeration Cycle
Cooling Refrigeration Cycle
Printed from D155726P01 Rev03
NOTE 1:
Line Dampener
DO NOT REMOVE
LINE DAMPENER
(SEE NOTE 1)
LINE DAMPENER
(SEE NOTE 1)
8

Heating Refrigeration Cycle
Cooling Refrigeration Cycle
Printed from D155726P01 Rev03
NOTE 1:
Line Dampener
DO NOT REMOVE
LINE DAMPENER
(SEE NOTE 1)
LINE DAMPENER
(SEE NOTE 1)
9
REFRIGERATION CIRCUITS

10
See Table 4
See Table 2 See Table 1
Test Point
Common
J3
J8
T2
T5 J4
24VAC to SHR-1 for
sump heat
Low Pressure Cut Out
0 VAC = Closed
24 VAC = Open
(pin to pin)
J6 J7
See Table 3
J9
DCV Test
Point (+VP)
See Table 5
CONTROL BOARD TEST POINTS
Test DC voltages at the locations shown below. Corresponding tables show proper values or ranges.
Sump Heat ON At power up (10 hours max) if compressors remain OFF
Sump Heat OFF When a compressor is running
Sump Heat OFF For 30 minutes after compressor(s) have stopped running
Sump Heat OFF When outdoor temperature goes above 85'F (sump heat remains off
down to 75'F)
Note: The system is designed so that a compressor and sump heat will not run at the same time
Sump Heat Control - T2
TABLE 2
Cooling & Heating Speed Volts DC at plug J3-PWM (to test point common)
Low Stage 5 to 7
High Stage 7.5 to 10
Defrost Soft-Switchover 0.5
TABLE 1
20 SEER Outdoor ECM Fan Control Signals

11
Temp
°F
Temp
°C
THERMISTOR
RESISTANCE
(OHMS)
Volts DC at plug
J6 & J7 Only
(pin to pin)
0 -17.8 83247 3.29
5 -15.0 71108 3.11
10 -12.2 60916 2.93
15 -9.4 52333 2.74
20 -6.7 45076 2.55
25 -3.9 38927 2.37
30 -1.1 33703 2.19
35 1.7 29253 2.02
40 4.4 25452 1.85
45 7.2 22198 1.70
50 10.0 19405 1.55
55 12.8 17002 1.41
60 15.6 14930 1.28
65 18.3 13138 1.17
70 21.1 11586 1.06
75 23.9 10238 0.96
80 26.7 9065 0.87
85 29.4 8043 0.78
90 32.2 7150 0.71
95 35.0 6368 0.64
100 37.8 5682 0.58
105 40.6 5079 0.53
110 43.3 4548 0.48
115 46.1 4079 0.43
120 48.9 3665 0.39
125 51.7 3298 0.35
130 54.4 2972 0.32
135 57.2 2683 0.29
140 60.0 2425 0.27
145 62.8 2195 0.24
150 65.6 1990 0.22
Ambient and Coil Sensors - J6, J7
TABLE 3
Temp
°F
Temp
°C
THERMISTOR
RESISTANCE (OHMS)
Volts DC at plug
J8 Only
(pin to pin)
50 10.0 19405 2.22
55 12.8 17002 2.06
60 15.6 14930 1.90
65 18.3 13138 1.75
70 21.1 11586 1.61
75 23.9 10238 1.48
80 26.7 9065 1.36
85 29.4 8043 1.24
90 32.2 7150 1.14
95 35.0 6368 1.04
100 37.8 5682 0.95
105 40.6 5079 0.86
110 43.3 4548 0.79
115 46.1 4079 0.72
120 48.9 3665 0.66
125 51.7 3298 0.60
Liquid Line Temperature Sensor - J8
TABLE 4
Liquid Line
Pressure Transducer
Ambient Sensor
Liquid Line
Temperature Sensor
Coil Sensor
Pressure
(PSIG)
Volts DC at plug J9
Test Point (+VP)
(to test point common)
30 0.66
60 0.83
90 1.00
120 1.18
150 1.35
180 1.52
210 1.69
240 1.86
270 2.03
300 2.21
330 2.38
360 2.55
390 2.72
420 2.89
450 3.06
480 3.23
510 3.41
540 3.58
570 3.75
600 3.92
630 4.09
660 4.26
Liquid Line
Pressure Transducer - J9
Voltage to pressure reference chart
TABLE 5

12
24 VAC at plug J6
Standby B to R
1st Stage ON ON B to R & Y1
2nd Stage ON OFF ON ON ON B to R, Y1 & Y2
Standby OFF OFF B to R & O
1st Stage ON B to R, Y1 & O
2nd Stage ON OFF ON B to R, Y1, Y2 & O
EEV control STATUS LED
1 sec 2 sec 3 sec 4 sec
ON Continuous
ON
OFFOFF
Heat
TABLE 6
Control Input and Status LED - J6
ON
Cool
OFF
OFF
OFF
OFF
ELECTRONIC EXPANSION VALVE (EEV) CONTROL BOARD
LED
Color
EEV
Fault LED Description
3 Flash Suction Pressure Transducer input is out of range (Replace transducer) (1)
4 Flash Suction Temperature Sensor input is out of range (Replace sensor) (1)
5 Flash Coil has short circuit (Replace Coil) (2)
6 Flash Valve is not responding to a position change command (Possible stuck valve)
7 Flash Valve is responding but system is not performing properly (Low charge or restriction)
8 Flash Compressor is not pumping (3)
9 Flash Low superheat in Cooling Mode (Indoor TXV stuck open or ID Fan failure)
10 Flash Not used at this time
(3) Monitor superheat and pressure: <3' SH for 5 minutes with valve @ minimum position, Monitor off-cycle
pressure and compare to next on-cycle for pressure drop within 60 seconds
Red
(1) Valve will close and LPCO will trip
OFF
1 Flash
Standby
Coil has an open circuit or intermittent short (Replace Coil)
(2) Power supply will shut down to protect board
EEV Fault Codes
EEV not used on all models
2 Flash Control has detected an internal failure (Replace EEV control board)
The following may require additional diagnostics
Notes:
Printed from D802247P01 Rev08
Fault LED (Red)
OPEN
CLOSE
TEST
STATUS LED
(Green)
Fault LED
(Red)
Status LED (Green)
On - Control has power
Flashing Fast - Control is driving valve (5 seconds max drive time)
Flashing Pattern - See Table 6.
Fault Storing/Clearing:
Faults 6-9 will be stored in non-volatile memory. See Close Valve Test for fault clearing procedure.
Faults 1-5 will clear with a power cycle.

13
TROUBLESHOOTING THE EEV
System is pumping down
in heat mode
EEV is not sensing that the compressor is
ON and in the Heat Mode
1. Check plug and harness to J6
2. Verify 24VAC at Y1 and/or Y2 inputs to
EEV control J6 are present (not “O”) See
Table 6 in Service Facts.
EEV valve is stuck closed
1. See Service Facts for Open Valve Test
System is very low on charge
1. Check charge per Service Facts
Low superheat (flooding) in
heating mode
EEV valve is stuck open
1. See Service Facts for Close Valve Test
Sensors are out of calibration
1. Verify sensors are accurate. See Table 7
& 8 in Service Facts
High superheat (low
suction pressure) in
heating mode
System is low on charge
1. Check charge per Service Facts
EEV valve is stuck closed
1. See Service Facts for Open Valve Test
Sensors are out of calibration
1. Verify sensors are accurate. See Table 7
& 8 in Service Facts
EEV Hunting
(Suction pressure moves
up & down)
Sensor are out of calibration
1. Verify sensors are accurate. See Table 7
& 8 in Service Facts
Verify temperature sensor is clipped tight
to suction line and insulated
Verify Outdoor Unit:
1. Is free and clear of ice and debris
2. Has adequate clearance
3. Distributor tubes are not bent or kinked
The Electronic Expansion Valve (EEV) installed in this heat pump is designed to control
superheat entering the compressor when the system is running in mechanical heating mode.
During cooling mode, refrigerant flow bypasses the EEV via a check valve and is controlled
by the expansion device in the indoor unit. Therefore, any operational problems
observed in cooling mode are not caused by the EEV.
The following flow chart was designed to assist in troubleshooting the EEV.
Note: The EEV closes with every OFF cycle in the heating mode of operation. During
Defrost and in the cool
sound can be heard when valve is changing positions.
ing mode of operation, the EEV will drive to 1/2 open. An audible

14
Test Pins
J1
To Coil on
EEV
J6
OPEN
CLOSE
TEST
J7
OPEN
CLOSE
TEST
STATUS LED
(Green)
Fault LED
(Red)
See Table 8
Suction Line
Pressure
Transducer Input
J10
See Table 7
Suction Line
Temperature
Sensor Input
See Table 6
Control Input
24 VAC Stage/Mode
DC V TEST
POINT
EEV CONTROL BOARD TEST POINTS
Note: Must be running in Heat Mode (Y1 or Y2 input, no O input, power input R & B)
Test Pins: OPEN, CLOSE, TEST (See EEV Board drawing for locations)
Close Valve Test - Touch CLOSE pin to TEST pin.
EEV drives closed (5 seconds max) and stays closed for 2 minutes.
1) Status LED will be flashing.
2) Gauges should indicate suction pressure dropping.
• Valve is working.
• LPCO may trip.
Note: If jumper is left on pins, any faults stored in memory will be cleared after 10 seconds. The CLOSE VALVE TEST
will clear after 2 minutes and will not reinitiate (requires a break and make to reinitialize).
Open Valve Test - Touch OPEN pin to TEST pin.
EEV drives open (5 sec max) and stays open for 30 seconds.
1) Status LED will be flashing.
2) Temperature probe should indicate superheat falling.
• Valve is working.
Note: If jumper is left on pins, the OPEN VALVE TEST will be cleared after 30 seconds and will not reinitiate (requires a
break and make to reinitialize).
Exit Test Mode - The Open Valve Test or Closed Valve Test can be cancelled by jumping to the opposite mode Test pin.
The system will return to normal super heat control.
Test mode will cancel if:
1) Unit enters Defrost
2) Stage-Delay occurs
3) Y1 or Y2 input(s) are lost

15
Temp °F Temp °C
THERMISTOR
RESISTANCE
(OHMS)
Volts DC at Plug J10
(pin to pin)
0 -17.8 83247 3.87
5 -15.0 71108 3.73
10 -12.2 60916 3.57
15 -9.4 52333 3.41
20 -6.7 45076 3.25
25 -3.9 38927 3.08
30 -1.1 33703 2.91
35 1.7 29253 2.73
40 4.4 25452 2.56
45 7.2 22198 2.39
50 10.0 19405 2.22
55 12.8 17002 2.06
60 15.6 14930 1.90
65 18.3 13138 1.75
70 21.1 11586 1.61
75 23.9 10238 1.48
80 26.7 9065 1.36
85 29.4 8043 1.24
90 32.2 7150 1.14
95 35.0 6368 1.04
100 37.8 5682 0.95
105 40.6 5079 0.86
110 43.3 4548 0.79
115 46.1 4079 0.72
120 48.9 3665 0.66
125 51.7 3298 0.60
130 54.4 2972 0.54
135 57.2 2683 0.50
136 57.8 2629 0.49
137 58.3 2576 0.48
138 58.9 2525 0.47
139 59.4 2474 0.46
140 60.0 2425 0.45
141 60.6 2377 0.45
142 61.1 2330 0.44
143 61.7 2284 0.43
144 62.2 2239 0.42
145 62.8 2195 0.41
146 63.3 2153 0.41
147 63.9 2111 0.40
148 64.4 2070 0.39
149 65.0 2030 0.39
150 65.6 1990 0.38
TABLE 7
Suction Line Temperature Sensor - J10
Suction Line
Pressure Transducer
Suction Line
Temperature Sensor
Pressure
(PSIG)
Volts DC at plug J7
(to test point common)
34 0.8
41 0.9
51 1.0
60 1.1
70 1.2
80 1.3
89 1.4
99 1.5
108 1.6
118 1.7
130 1.8
140 1.9
147 2.0
159 2.1
169 2.2
178 2.3
188 2.4
198 2.5
Suction Line
Pressure Transducer - J7
TABLE 8
Voltage to pressure reference Chart

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Trane has a policy of continuous product and product data improvement and it reserves the right to change
design and specifications without notice.