Trane TCONT402AN32DA User Manual

Installer’s Guide

▲

XR402

TCONT402AN32DA

3 Heat (Gas, Oil* or Elec) / 2 Cool / Heat Pump, Dual Fuel

(Factory set for 2H/2C gas/cooling applications, BK Output enabled)

Electronic Non-Programmable
3 - 16 Wire Hookup (2 for Outdoor Sensor)

(2 for Optional Remote Indoor Sensor, 2 for Optional Humidistat)

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

Note: Read the entire instruction manual before starting the
installation.

Contents

Introduction ........................................................................... 1

Application ............................................................................ 1

Product Specifications ........................................................ 2

Installation ............................................................................ 2

Mounting and Wiring ............................................................. 2

SETUP ................................................................................... 3

Checkout ............................................................................... 4

Troubleshooting .................................................................. 14

Features .............................................................................. 15

$

Fan Mode

Filter/OD

18-HD29D3-4

Available in French Canadian (FC)

Introduction

TCONT402AN32DA is a digital non-programmable
3Heat/ 2 Cool/Heat Pump/ Heat-Cool wall mounted low
voltage (24VAC) Comfort Control with backlit LCD and
keypad. It maintains room temperature by controlling the
operation of heating, cooling, heat pump and dual fuel
systems. The Comfort Control is easily configured for heat
pump or cooling only and gas or electric or dual fuel heat
applications via the user friendly Installer Setup menu.
The Comfort Control features include separate heating
and cooling setpoints, selectable auto or manual
changeover, adjustable energy saving mode, adjustable
filter reminder, outdoor temperature sensing, remote room
sensing and remote humidistat input. Setup selections
and diagnostics are stored indefinitely in the Comfort
Controls nonvolatile memory eliminating the need for
battery backup.

Safety Considerations

Read the following manufacturer instructions carefully.
Follow all local codes during installation. All wiring must
conform to local and national electrical codes. Improper
wiring or installation may damage the comfort control.
Recognize safety information. This is the safety alert
symbol
and in the instruction manual, be alert to the potential for
personal injury.
Understand the signal words DANGER, WARNING and
CAUTION. These words are used with the safety-alert
symbol. DANGER identifies the most serious hazards
which will result in severe personal injury or death.
WARNING signifies a hazard which could result in
personal injury or death. CAUTION is used to identify
unsafe practices which could result in minor personal
injury or product and property damage.

!

. When you see this symbol on the equipment

Application Hook Up Diagrams

Dual Fuel* FIG

1-2 Stage/Step Heat Pump 2 Stage VS Gas Furnace w/ BK DF-1
2 Stage Heat Pump 2 Stage VS Gas Furnace no BK DF-2
2 Step Heat Pump 2 Stage VS Gas Furnace no BK DF-3
1 Stage Heat Pump 2 Stage VS Gas Furnace no BK DF-4
1 Stage Heat Pump 1-2 Stage Non-VS

Gas Furnace no BK DF-5

Heat Pump

1-2 Stage/Step Heat Pump VS Air Handler w/ BK HP-1
2 Stage Heat Pump VS Air Handler no BK HP-4
2 Step Heat Pump VS Air Handler no BK HP-5
2 Heat Pumps Split Coil VS Air Handler w/ BK HP-2
2 Heat Pumps Split Coil VS Air Handler no BK HP-3
1 Stage Heat Pump VS Air Handler no BK HP-6
1 Stage Heat Pump Non-VS Air Handler no BK HP-7

Cooling

1-2 Stage/Step Cooling VS Indoor w/ BK CL-1
2 Stage Cooling VS Indoor no BK CL-3
2 Step Cooling VS Indoor no BK CL-4
2 Cool Units Split Coil VS Air Handler w/ BK CL-2
2 Cool Units Split Coil VS Air Handler no BK CL-5
1 Stage Cooling VS Indoor no BK CL-6
1 Stage Cooling Non-VS Indoor no BK CL-7
1 Stage Cooling 1 Stage Non-VS

Oil Furnace no BK OIL-1
1 Stage Heat Pump Non-VS Oil Furnace no BK OIL-2
1-2 Stage/Step Heat Pump VS Oil Furnace w/ BK OIL-3

* Requires external relay for Oil furnace applications. TAYPLUS103 not required

BAYSENS01ATEMPA for outdoor temperature sensing and display and optional
control is included.

Optional Humidistat: BAYSTAT253A

Optional Remote Indoor Sensor: ZZSENSAL0400AA

Installer’s Guide

▲

Product Specifications

- Power Source: 20-30VAC, Class II, 50/60Hz.

- System Mode: Heat, Cool, Auto, Emergency Heat and Off

- Fan Mode: Auto and On

- Cooling setpoint temperature range: 65°F - 90°F,

18.0°C - 33.0°C, 1°F and 0.5°C resolution.

- Heating setpoint temperature range: 40°F- 85°F,

5.0°C - 30.0°C, 1°F and 0.5°C resolution.

- Default set points: 68°F, 20.0°C Heat, 78°F, 25.5°C Cool

- Storage Range: -40°F to 140°F,
5% - 90% RH non-condensing.

- Operating Temperature range: 32°F - 110°F,
5% - 90% RH non-condensing.

- Outdoor Temperature Display Range: -40°F - 140°F.

- Minimum Cycle Off Time Delay: Cooling - 5 minutes,
Heating - 1 minute.

- Use minimum 18 gauge NEC approved control wiring.

!

CAUTION

To prevent shortening its service life, the control should not
be installed until construction is completed.

Y2 W

OT1
OT2

3

R W

RS1
RS2

Y

2

W

1 Y1 G

O

B

BK H1 H2

Installation

Comfort Control - Location

The Comfort Control should be mounted approximately 60”
(1.5m) off the floor on an interior partition wall. Never install
the Comfort Control on an outside wall.

For proper temperature sensing, avoid mounting the
Comfort Control where it will be exposed to heat radiated
from lamps, sun light, fireplaces or any other radiant heat
sources.

Avoid locations close to windows, behind doors or alcoves with
poor air circulation, adjoining outside walls, or doors that lead
to the outside.

Select a location that prevents the Comfort Control from
being directly exposed to air currents from supply registers.

Mount the Comfort Control on a section of interior wall that
does not contain hot and cold water pipes or ductwork.

Outdoor Sensor - BAYSEN01ATEMPA - Location

Careful consideration of the following recommendations will
help the outdoor sensor provide continuous accurate readings:

1. Mount the outdoor sensor on the north facing side of the
building in an area where it is exposed to freely circulat­ing airflow and out of direct sunlight.

2. Do not allow hot air airflow from the attic or drafts from
inside exterior walls to bias the sensors operation.
Always seal the hole where control wiring passes to the
outside of the structure. Use non-hardening caulk, putty,
or insulation.

3. Avoid locations such as near dryer vents or placing the
sensor close to, or directly above the outdoor unit where it
would be exposed to hot discharge air from the condenser
fan.

4. Maximum length of field wiring cable to sensor is 200
feet.

5. Minimum wire gauge is 18AWG.

Mounting and Wiring

1. Turn OFF all power to heating and cooling equipment.

2. If an existing thermostat is being replaced:
a. Remove existing thermostat from wall.

2 Pub. No. 18-HD29D3-4

© 2008 Trane All Rights Reserved

b. Disconnect wires from existing control, one at a time. Be

careful not to allow wires to fall back into the wall.

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

terminal marking.

d. Discard or recycle old thermostat.

Mercury is a hazardous waste and MUST be managed

properly. If the Comfort Control is replacing a thermostat
that contains mercury in a sealed tube, do not place your old
thermostat in the trash. Contact your local waste manage­ment authority for instructions regarding recycling and the
proper disposal of an old thermostat.

3. Separate the control from the mounting base to expose
mounting holes by pressing the release button A on the
bottom of the control with the thumb of one hand while
gripping the subbase by the mounting holes with the
other hand. Lift out and up. See Figure 1.

4. Slide the mounting base drawer out to expose all the
mounting holes. Route control wires through the large
hole in mounting base.
Level mounting base against wall (for aesthetic value
only) and mark wall through 2 mounting holes. See
Figure 2.

5. Drill two mounting holes in wall where marked.

6. Secure mounting base to wall with 2 screws (use anchors
provided if needed). Additional mounting holes are
available for more secure mounting if needed.
Make sure all wires (including the 2 outdoor sensor wires)
extend through hole in mounting base.

7. Adjust length and routing of each wire to reach proper
terminal on the connector block on mounting base. Strip
only 1/4-in. of insulation from each wire to prevent
adjacent wires from shorting together when connected.

Figure 1

Fold Business
card & insert
into slot

M

y

Company
A/C & Heating
Service

[phone]

Figure 2

Installer’s Guide

8. Match and connect control wires to proper terminals on the
connector block. (See the following wire diagrams).

9. Push any excess wire back into the wall and
to prevent air leaks.

Note: Air leaks in the wall behind the control can cause
improper operation.

10. Check the operation of the business card drawer. Verify
that it slides in and out without binding.

11. Reinstall the control on its mounting base by aligning the
control at the top of the mounting base. Swing the control
downward and gently press the bottom of control into
position until latch button A engages. See Figure 1.

12. Turn ON power to the heating and cooling equipment.

seal the hole

Figure 6

SETUP

Enter INSTALLER Setup:

(See Table 3, step 1 - 49 for option details)

1.) Set System Mode to OFF

2.) Set Fan to AUTO

3.) Press and hold Mode and Up Arrow at the same time.

4.) SET-UP will appear on display. See Figure 6.

Enter USER Setup:

(See Table 3A, steps 50-62 for option details)

Press and hold Mode and Fan at the same time.

Note: Allow a minimum of 5 seconds after saving selections
(Step 99 - SA) for the control to write selections to memory.
If power is lost or removed prior to the 5 second elapsed
time, the selections may be lost and must be reentered. If
the SERVICE icon is flashing on the control LCD, press any
key and check / re-enter setup choices.

Keypad Navigation:

Use the Mode and Fan buttons to navigate forward and
backward through the configuration and Manual Test Mode
steps.
Press Mode to advance forward to the next step.

OT1

OT2

Y2

$

Fan Mode

Filter/OD

Outdoor Temp

Outdoor Temp

W2

W3

R

Note: Dual Fuel Applications.

system type is HP and the Indoor Heater Type is Gas or Oil
(Dual Fuel System) the JP1 jumper on the PCB must be cut.

COMFORT CONTROL
TERMINAL BLOCK

Remote Indoor Sensor

Remote Indoor Sensor

W1

Y/

Y1

G

O

B

When the

RS1

RS2

BK

H1

H2

FAN

24VAC HOT

COOLING-2nd

Pub. No. 18-HD29D3-4 3

HEATING -3rd

HEATING -2nd

HEATING -1st

COOLING -1st

SOV

common

VS MODE -fan

24VAC

Humidistat

Humidistat

Installer’s Guide

Press Fan to return to the previous step.

Use the Up and Down arrow buttons to select or change
setup options.

Lock - Unlocok Keypad:

Press and hold Up Arrow and Down Arrow at the same

time.
(“Keypad Locked” will display on LCD screen)

Defeat Equipment Time Delay:

(Current Cycle only) Press Mode and Down Arrow at the

same time.

Checkout

There are two methods of verifying that the Comfort
Control operates the system as intended.

Method 1: Normal Mode

This can be accomplished by pressing the appropriate
keypad button(s) to cycle the system through each of
the available modes and increasing or decreasing the
setpoint to activate and deactivate the cycle.
The minimum on and off cycle time delays, selected
during the setup, will be enforced. Press the appropri­ate keypad button for the filter timer, outdoor tem­perature display and energy savings features to verify
they are set to the end user’s desired preference.

Method 2: Manual Test Mode

The Comfort Control’s load outputs can be verified
using the manual test mode. See Table 1 for navigat­ing through the manual test mode steps.

To Enter The Manual Test Mode:

1.) Set System Mode to OFF

2.) Set Fan to AUTO

3.) Press and hold Mode and Down Arrow at the same
time.

The Manual test mode will time out and return to normal
operation after 4 minutes from the last key press.

Table 1 Manual Test Mode

Menu Item
(Press MODE or FAN)

G - Fan Relay

BK - BK Output

Y1 - Compressor
(G - must be ON)

Y2 - Compressor
Contactor
(G - must be ON)

O - Switch Over Valve

W1 - Heating Relay

W2 - Heating Relay

W3 - Heating Relay

LCD

Factory Use Only

"G"

"b"
"y"

"y2"

"0"

"ui"

"u2"

"u3"

"SC"

Default

Off

35%

Off

Off

Ht

Off

Off

Off

----

Press and hold MODE to advance
to step 80 an press $ to exit.

Setting (Choices)
(Press Up or Down arrow)

On / Off

35% - 100%

On / Off

On / Off

Cl/Ht

On / Off

On / Off

On / Off

All icons On (see fig 8)
All icons Off

Step
(Press MODE or FAN)

70

71

72

73

74

75

76

77

78

79 - 89

NOTE: The manual test mode allows the installer to
energize the G fan relay, Table 1, Step 70, and then
advance to Step 72 to energize the Y compressor output
with the fan still operating. It is recommended that this
method be used to prevent damage to the compressor.

Table 2

T deg F

(OHMS X 1000)

10K THERMISTOR

-15 138.9

-10 117.7

-5 99.9

0 85.1

5 72.7

10 62.3

15 53.5

20 46.1

25 39.8

30 34.5

RESISTANCE

T deg F

35 30.0 80 9.3

40 26.1 85 8.3

45 22.7 90 7.3

50 19.9 95 6.5

55 17.4 100 5.8

60 15.3 105 5.2

65 13.5 110 4.7

70 11.9 115 4.2

75 10.5 120 3.8

RESISTANCE

(OHMS X 1000)

10K THERMISTOR

T deg F

Figure 8

RESISTANCE

(OHMS X 1000)

10K THERMISTOR

4 Pub. No. 18-HD29D3-4

Installer’s Guide

DUAL FUEL ONE OR TWO STAGE OR TWO STEP HEAT PUMP
TWO STAGE VS GAS FURNACE
BK ENABLED

Note B - Cut/remove the factory installed "BK" jumper at the indoor unit.
Note C - For Dual Fuel, cut the JP1 jumper on the Comfort Control.

NOTE: See Fig. OIL-1 for
external relay connections
for oil furnaces.

COMFORT CONTROL

COOL/HEAT

-2nd STAGE

24VAC HOT

HEATING ­4th STAGE

HEATING ­3rd STAGE

COOL/HEAT ­1st STAGE

FAN

SOV

24VAC

VS MODE -fan

O D Temp

O D Temp

OT1

OT2

common

Y2

W3

R

W2

W1

Y/
Y1

G

O

B

BK

O D
Sensor

TWO STAGE
VARIABLE SPEED
GAS FURNACE

Y/
Y2

R

W2

W1

Y1/
Y

LO

G

O

B

C

BK

ONE OR TWO STAGE
OR TWO STEP
HEAT PUMP

Y2

R

F

X2

Y1

O

B

T

DUAL FUEL TWO STAGE HEAT PUMP
TWO STAGE VS GAS FURNACE
BK DISABLED

Note C - For Dual Fuel, cut the JP1 jumper on the Comfort Control.
NOTE: See Fig. OIL-1 for external relay connections for oil furnaces.

TWO STAGE

COMFORT CONTROL

COOL/HEAT ­2nd STAGE

Y2

VARIABLE SPEED
GAS FURNACE

Y/
Y2

TWO STAGE
HEAT PUMP

Y2

W3

24VAC HOT

HEATING ­4th STAGE

HEATING ­3rd STAGE

COOL/HEAT ­1st STAGE

FAN

SOV

common

24VAC

O D Temp

O D Temp

OT1

OT2

R

W2

W1

Y/
Y1

G

O

B

BK

O D
Sensor

R

W2

W1

Y1/
Y

G

O

B

BK

R

F

X2

LO

Y1

O

C

B

T

Figure DF-1

DUAL FUEL TWO STEP HEAT PUMP
TWO STAGE VS GAS FURNACE
USE ONLY WITH 16 SEER CONDENSER
BK DISABLED

Note A - The installer must jumper "R" to "O" at the LVTB.
Note B - Cut/remove the factory installed "BK" jumper at the indoor unit.
Note C - Cut the JP1 jumper on the Comfort Control, for Dual Fuel.

NOTE: See Fig. OIL-1 for external relay connections for oil furnaces.

COMFORT CONTROL

COOL/HEAT ­2nd STAGE

24VAC HOT

HEATING ­4th STAGE

HEATING ­3rd STAGE

COOL/HEAT ­1st STAGE

FAN

SOV

24VAC

O D Temp

O D Temp

common

OT1

OT2

Y2

W3

R

W2

W1

Y/

Y1

G

O

B

BK

O D
Sensor

TWO STAGE
VARIABLE SPEED
GAS FURNACE

BK

R

W2

W1

Y/
Y2

G

O

B

C

Y1/
Y

LO

TWO STEP
HEAT PUMP

Y2

R

X2

Y1

O

B

T

Figure DF-2

DUAL FUEL SINGLE STAGE HEAT PUMP
TWO STAGE VS GAS FURNACE
BK DISABLED

Note C - For Dual Fuel, cut the JP1 jumper on the Comfort Control.

NOTE: See Fig. OIL-1 for external relay connections for oil furnaces.

COMFORT CONTROL

Y2

W3

24VAC HOT

HEATING ­3rd STAGE

HEATING ­2nd STAGE

COOL/HEAT ­1st STAGE

FAN

SOV

24VAC

O D Temp

O D Temp

common

OT1

OT2

W2

W1

Y1

BK

R

Y/

G

O

B

TWO STAGE VARIABLE
SPEED GAS FURNACE

Y1/
Y

B

O D
Sensor

W2

W1

Y/
Y2

BK

LO

R

G

O

C

SINGLE STAGE
HEAT PUMP

R

X2

Y

O

B

T

Figure DF-3

Figure DF-4

Pub. No. 18-HD29D3-4 5

DUAL FUEL SINGLE STAGE HEAT PUMP
NON-VARIABLE SPEED ONE OR TWO STAGE GAS FURNACE
BK DISABLED

Note C - For Dual Fuel, cut the JP1 jumper on the Comfort Control.
NOTE: See Fig. OIL-1 for external relay connections for oil furnaces.

COMFORT CONTROL

NON-V.S. ONE

24VAC HOT

HEATING ­3rd STAGE

HEATING ­2nd STAGE

COOL/HEAT ­1st STAGE

Y2

W3

R

W2

W1

Y/

Y1

OR TWO STAGE
GAS FURNACE

R

W2

W/
W1

Y

SINGLE STAGE
HEAT PUMP

R

X2

Y

Installer’s Guide

FAN

SOV

24VAC

O D Temp

O D Temp

common

OT1

OT2

G

O

B

BK

O D
Sensor

G

B

C

Figure DF-5

O

B

T

JP1

Cut for
Dual Fuel
Applications

JP 1 Location

6 Pub. No. 18-HD29D3-4

ONE OR TWO STAGE OR TWO STEP HEAT PUMP

R

G

Y/
Y1

W1

B

24VAC HOT

24VAC

common

COMFORT CONTROL

TWO HEAT PUMPS
SPLIT COIL VARIABLE SPEED AIR HANDLER
BK ENABLED

FAN

SOV

COOL/HEAT ­1st STAGE

HEATING ­3rd STAGE

HEATING ­4th STAGE

W2

O

R

G

W1

W2

Y1/
Y

LO

Y

B

TWO SEPARATE
HEAT PUMPS

VS AIR HANDLER
& ELECTRIC HEAT

W3

HEATING ­5th STAGE

Y2

COOL/HEAT ­2nd STAGE

BK

VS MODE -fan

Y/
Y2

Y

BK

B

SECOND
STAGE

FIRST
STAGE

X2

O

O

X2

A

B

96

3

7

4

R

R

B

O D
Temp

OT1

O D
Temp

OT2

O D
Sensor

T

T

W3

O

Note B - Cut/remove the factory installed "BK" jumper at the indoor unit.

VARIABLE SPEED AIR HANDLER
BK ENABLED

Note B - Cut/remove the factory installed "BK" jumper at the indoor unit.

Installer’s Guide

COMFORT CONTROL

COOL/HEAT ­2nd STAGE

HEATING ­5th STAGE

24VAC HOT

HEATING ­4th STAGE

HEATING ­3rd STAGE

COOL/HEAT ­1st STAGE

FAN

SOV

24VAC

VS MODE -fan

O D Temp

O D Temp

common

OT1

OT2

Y2

W3

R

W2

W1

Y/

Y1

G

O

B

BK

VARIABLE SPEED
AIR HANDLER &
ELECTRIC HEAT

Y/
Y2

W3

R

W2

W1

Y1/
Y

LO

G

O

B

BK

O D
Sensor

ONE OR TWO STAGE
OR TWO STEP
HEAT PUMP

Y2

R

F

Y1

X2

O

B

T

TWO HEAT PUMPS
SPLIT COIL VARIABLE SPEED AIR HANDLER
BK DISABLED

VS AIR HANDLER
& ELECTRIC HEAT

COMFORT CONTROL

COOL/HEAT ­2nd STAGE

HEATING -

O D Temp

O D Temp

5th STAGE

24VAC HOT

HEATING ­4th STAGE

HEATING ­3rd STAGE

COOL/HEAT ­1st STAGE

FAN

SOV

24VAC

OT1

OT2

Pub. No. 18-HD29D3-4 7

common

O D
Sensor

Y2

W3

R

W2

W1

Y/

Y1

G

O

B

BK

Figure HP-3

96

A

7

B

T

Y/
Y2

W3

R

W2

W1

Y1/
Y

G

O

B

BK

4

LO

3

TWO SEPARATE
HEAT PUMPS

T

Y

X2

O

B

R

Y

X2

O

R

T

Figure HP-2Figure HP-1

SECOND
STAGE

B

FIRST
STAGE

TWO STAGE HEAT PUMP
VARIABLE SPEED AIR HANDLER
BK DISABLED

VARIABLE SPEED

Y2

W3

R

W2

W1

Y/

Y1

G

O

B

BK

AIR HANDLER &
ELECTRIC HEAT

COMFORT CONTROL

COOL/HEAT ­2nd STAGE

HEATING ­5th STAGE

24VAC HOT

HEATING ­4th STAGE

HEATING ­3rd STAGE

COOL/HEAT ­1st STAGE

FAN

SOV

24VAC

common

Y/
Y2

W3

R

W2

W1

Y1/
Y

G

O

B

BK

Installer’s Guide

TWO STEP HEAT PUMP
VARIABLE SPEED AIR HANDLER
BK DISABLED

Note A - The installer must jumper "R" to "O" at the LVTB.
Note B - Cut/remove the factory installed "BK" jumper at the indoor unit.

TWO STAGE
HEAT PUMP

Y2

R

F

LO

Y1

X2

O

B

T

COMFORT CONTROL

COOL/HEAT ­2nd STAGE

HEATING ­5th STAGE

24VAC HOT

HEATING ­4th STAGE

HEATING ­3rd STAGE

COOL/HEAT ­1st STAGE

FAN

SOV

24VAC

common

Y2

W3

W2

W1

Y1

BK

R

Y/

G

O

B

VARIABLE SPEED
AIR HANDLER &
ELECTRIC HEAT

BK

W3

R

W2

W1

Y/
Y2

G

O

B

C

Y1/
Y

LO

TWO STEP
HEAT PUMP

Y2

R

Y1

X2

O

B

T

O D Temp

O D Temp

OT1

OT2

O D
Sensor

Figure HP-4

SINGLE STAGE HEAT PUMP
VARIABLE SPEED AIR HANDLER
BK DISABLED

VARIABLE SPEED
AIR HANDLER &

Y2

W3

R

W1

Y/

Y1

G

O

B

BK

ELECTRIC HEAT

COMFORT CONTROL

HEATING ­4th STAGE

24VAC HOT

HEATING ­3rd STAGE

HEATING ­2nd STAGE

COOL/HEAT ­1st STAGE

W2

FAN

SOV

24VAC

common

Y1/
Y

W3

W2

W1

Y/
Y2

B

BK

O D Temp

O D Temp

OT1

OT2

O D
Sensor

Figure HP-5

SINGLE STAGE HEAT PUMP
NON-VARIABLE SPEED AIR HANDLER
BK DISABLED

SINGLE STAGE

COMFORT CONTROL

HEAT PUMP

Y2

LO

R

R

Y

G

O

C

X2

O

B

T

HEATING ­4th STAGE

24VAC HOT

HEATING ­3rd STAGE

HEATING ­2nd STAGE

COOL/HEAT
1st STAGE

FAN

SOV

24VAC

common

W3

W2

W1

Y/

Y1

O

BK

R

G

B

AIR HANDLER &
ELECTRIC HEAT

W3

R

W2

W1

Y

G

B

SINGLE STAGE
HEAT PUMP

R

X2

Y

O

B

T

O D Temp

O D Temp

OT1

OT2

O D
Sensor

Figure HP-6

O D Temp

O D Temp

OT1

OT2

O D
Sensor

Figure HP-7

8 Pub. No. 18-HD29D3-4

ONE OR TWO STAGE OR TWO STEP COOLING
VARIABLE SPEED INDOOR
BK ENABLED

Note B - Cut/remove the factory installed "BK" jumper at the indoor unit.
NOTE: See Fig. OIL-1 for external relay connections for oil furnaces.
NOTE: Two additional wires are required for Outdoor Temperature Sensor.

Installer’s Guide

TWO STAGE COOLING
SPLIT COIL VARIABLE SPEED AIR HANDLER
BK ENABLED

Note B - Cut/remove the factory installed "BK" jumper at the indoor unit.

NOTE: Two additional wires are required for Outdoor Temperature Sensor.

COMFORT CONTROL

common

Y2

W3

R

W2

W1

Y/

Y1

G

O

B

BK

COOLING-2nd

HEATING -3rd

24VAC HOT

HEATING -2nd

HEATING -1st

COOLING -1st

FAN

24VAC

VS MODE -fan

TWO STAGE VS
GAS FURNACE or
VS AIR HANDLER
& ELECTRIC HEAT

Y/
Y2

W3

R

W2

W1

Y1/
Y

LO

G

O

B

C

BK

ONE OR TWO STAGE
OR TWO STEP AIR
CONDITIONER

Y2

R

Y/
Y1

B

Figure CL-1

TWO STAGE COOLING
VARIABLE SPEED INDOOR
BK DISABLED

NOTE: See Fig. OIL-1 for external relay connections for oil furnaces.

NOTE: Two additional wires are required for Outdoor Temperature Sensor.

TWO STAGE V.S.

COMFORT CONTROL

COOLING-2nd

HEATING -3rd

24VAC HOT

HEATING -2nd

HEATING -1st

COOLING -1st

FAN

Y2

W3

R

W2

W1

Y/

Y1

G

O

B

common

24VAC

BK

GAS FURNACE or
VS AIR HANDLER
& ELECTRIC HEAT

Y/
Y2

W3

R

W2

W1

Y1/
Y

G

O

B

BK

TWO STAGE
AIR CONDITIONER

LO

C

Y2

R

Y1

B

COMFORT CONTROL

COOLING-2nd

HEATING -3rd

24VAC HOT

HEATING -2nd

HEATING -1st

COOLING -1st

FAN

Y2

W3

R

W2

W1

Y/

Y1

G

O

24VAC

common

B

VS MODE -fan

BK

VS AIR HANDLER
& ELECTRIC HEAT

Y/
Y2

W3

R

W2

W1

Y1/
Y

LO

G

O

B

BK

TWO SEPARATE
AIR CONDITIONERS

Y

B

SECOND
STAGE

Y

B

FIRST
STAGE

Figure CL-2

TWO STEP COOLING
VARIABLE SPEED INDOOR
BK DISABLED

Note A - The installer must jumper "R" to "O" at the LVTB.
Note B - Cut/remove the factory installed "BK" jumper at the indoor unit.

NOTE: See Fig. OIL-1 for external relay connections for oil furnaces.
NOTE: Two additional wires are required for Outdoor Temperature Sensor.

TWO STAGE VS

COMFORT CONTROL

common

Y2

W3

R

W2

W1

Y/

Y1

G

O

B

BK

COOLING-2nd

HEATING -3rd

24VAC HOT

HEATING -2nd

HEATING -1st

COOLING -1st

FAN

24VAC

GAS FURNACE or
VS AIR HANDLER
& ELECTRIC HEAT

BK

W3

R

W2

W1

Y/
Y2

G

O

B

C

Y1/
Y

LO

TWO STEP
AIR CONDITIONER

Y2

Y1

B

Figure CL-3

Figure CL-4

Pub. No. 18-HD29D3-4 9

TWO STAGE COOLING
SPLIT COIL VARIABLE SPEED AIR HANDLER
BK DISABLED

NOTE: Two additional wires are required for Outdoor Temperature Sensor.

Installer’s Guide

SINGLE STAGE COOLING
VARIABLE SPEED INDOOR
BK DISABLED

NOTE: See Fig. OIL-1 for external relay connections for oil furnaces.

NOTE: Two additional wires are required for Outdoor Temperature Sensor.

COMFORT CONTROL

COOLING-2nd

HEATING -3rd

24VAC HOT

Y2

W3

R

VS AIR HANDLER
& ELECTRIC HEAT

Y/
Y2

W3

R

TWO SEPARATE
AIR CONDITIONERS

Y

B

HEATING -2nd

HEATING -1st

COOLING -1st

FAN

24VAC

common

W2

W1

Y/

Y1

BK

G

O

B

W2

W1

Y1/
Y

G

O

B

BK

SECOND
STAGE

LO

Y

B

FIRST
STAGE

Figure CL-5

SINGLE STAGE COOLING
NON-VARIABLE SPEED INDOOR
BK DISABLED

NOTE: Two additional wires are required for Outdoor Temperature Sensor.

NOTE: See Fig. OIL-1 for external relay connections for oil furnaces.

TWO STAGE VS

COMFORT CONTROL

Y2

common

W3

R

W2

W1

Y/

Y1

G

O

B

BK

HEATING -3rd

24VAC HOT

HEATING -2nd

HEATING -1st

COOLING -1st

FAN

24VAC

GAS FURNACE or
VS AIR HANDLER
& ELECTRIC HEAT

Y1/
Y

LO

W3

R

W2

W1

Y/
Y2

G

O

B

C

BK

SINGLE STAGE
AIR CONDITIONER

Y

B

Figure CL-6

SINGLE STAGE COOLING
SINGLE STAGE OIL FURNACE
BK DISABLED

NOTE: Two additional wires are required for Outdoor Temperature Sensor.

NOTE: BT (Bonnet Thermostat) model THT1248 (BAYSEN03ATEMPAA)
required for dual fuel, oil furnace applications.

COMFORT CONTROL

Y2

W3

24VAC HOT

HEATING

COOLING

FAN

24VAC

common

R

W2

W1

Y/

Y1

G

O

B

BK

SINGLE STAGE
OIL FURNACE

W3

R

W2

BT

R1

W

Y

G

B

C

R1

Figure OIL-1

SINGLE STAGE
AIR CONDITIONER

Y

B

COMFORT CONTROL

Y2

HEATING -3rd

24VAC HOT

HEATING -2nd

HEATING -1st

COOLING -1st

FAN

W3

R

W2

W1

Y/

Y1

G

O

24VAC

common

B

BK

ONE OR TWO STAGE
GAS FURNACE or
AIR HANDLER &
ELECTRIC HEAT

W3

R

W2

W/
W1

Y

G

B

C

Figure CL-7

SINGLE STAGE
AIR CONDITIONER

Y

B

10 Pub. No. 18-HD29D3-4

Installer’s Guide

DUAL FUEL SINGLE STAGE HEAT PUMP
NON-VARIABLE SPEED OIL FURNACE
BK DISABLED

NOTE: For Dual Fuel, cut the JP1 jumper on the Comfort Control
NOTE: Two additional wires are required for Outdoor Temperature Sensor.
NOTE: BT (Bonnet Thermostat) model THT1248 (BAYSEN03ATEMPAA)
required for dual fuel, oil furnace applications.

COMFORT CONTROL

24VAC HOT

HEATING ­3rd STAGE

HEATING ­2nd STAGE

COOL/HEAT ­1st STAGE

FAN

SOV

common

24VAC

Y2

W3

R

W2

W1

Y/

Y1

G

O

B

BK

NON-VARIABLE
SPEED
OIL FURNACE

R

W2

BT

W/

W1

Y

G

B

C

SINGLE STAGE
HEAT PUMP

R

R1

X2

Y

O

B

T

OIL BURNER PRIMARY

OD Temp

OT1

OD
Sensor

OD Temp

OT2

R1

DUAL FUEL ONE OR TWO STAGE OR TWO STEP HEAT PUMP
VARIABLE SPEED OIL FURNACE
BK ENABLED

NOTE B:Cut/remove the factory installed "BK" jumper at the indoor unit
NOTE C: For Dual Fuel, cut the JP1 jumper on the Comfort Control
NOTE: Cut/remove the factory installed "R" to "O" jumper at the LVTB.
NOTE: Two additional wires are required for Outdoor Temperature Sensor.
NOTE: BT (Bonnet Thermostat) model THT1248 (BAYSEN03ATEMPAA)
required for dual fuel, oil furnace applications.

COMFORT CONTROL

COOL/HEAT
2nd STAGE

24VAC HOT

HEATING ­4th STAGE

HEATING ­3rd STAGE

COOL/HEAT ­1st STAGE

FAN

SOV

24VAC

common

VS MODE -fan

OD Temp

OD Temp

Y2 Y

W3

R

W2

W1

Y/

Y1

G

O

B

BK

OT1

OT2

OD
Sensor

VARIABLE
SPEED
OIL FURNACE

W3

R

W2

BT

W1

LO

Y

G

O

B

C

OIL BURNER PRIMARY

R1

ONE OR TWO
STAGE OR TWO
STEP HEAT PUMP

Y2

R

F

R1

X2

Y1

O

B

TBK

Figure OIL-2

Figure OIL-3

Pub. No. 18-HD29D3-4 11

Table 3 INSTALLER SETUP (ISU)

1. Set System MODE to OFF

2. Set FAN to AUTO

3. Press and hold MODE and Up arrow at the same time.

Menu Item

Error Count 0 None

Software Version None

Configuration
Signature - LoByte

Configuration
Signature - HiByte

System Type 1 1=AC,2=HP

Compressor Stages 2

Compressor Type 0 0=Two Step, 1=Two Stage

Indoor Heater Type 1

Indoor Heater Stages 2

Outdoor Sensor 0

BK Output 1

Variable Speed Blower
Turn-On Delay Profile

Variable Speed Blower
Turn-Off Delay Profile

Compressor
Low Stage Airflow

Heat Pump Warm Air Discharge 0 0=Disabled,1=Enabled

Non-Variable Speed
Cooling Blower ON delay

Non-Variable Speed
Cooling Blower OFF delay

Non-Variable Speed Compressor
Heating Blower ON delay

Non-Variable Speed Compressor
Heating Blower OFF delay

1st Stage Compressor
Cooling Cycles Per Hour

1st Stage Compressor Cooling
Minimum On Time

2nd Stage Compressor
Cooling Cycles Per Hour

2nd Stage Compressor Cooling
Minimum On Time

1st Stage Compressor
Heating Cycles Per Hour

1st Stage Compressor Heating
Minimum On Time

*see notes at the bottom of setup (ISU) Table 3A

Fac tory

Setting (Choices)

Setting

(Press UP or DOWN arrow)

None

None

0=None
1=Single Stage
2=Two Stage/Two Step

1=Gas,Oil
2=Electric
3=Wet Heat

0=None
1=Single Stage Heater
2=Two Stage Heater
3=Three Stage Heater

0=None
1=Has Sensor for Display Only
2=Has Sensor for Display and for Control

0 = BK Disabled
1 = BK Enabled

1 = No Delay
2 = 1 Minute @ 50%, 7.5 Minutes @ 80%
3 = 1 Minute @ 50%, 4 Minutes @ 80%

1

4 = 7.5 Minutes @ 80%
5 = 4 Minutes @ 80%
6 = 1 Minute @ 50%
7 = 30 Second Delay

1 = No Delay
2 = 1.5 Minutes @ 100%
3 = 45 Seconds @ 100%

1

4 = 30 Seconds @ 50%
5 = 1.5 Minutes @ 50%
6 = 3 Minutes @ 50%
7 = 30 Seconds @ 35%

65% Two Step Range: 55%-80%

50% Two Stage Range: 35%-60%

00 - 30 Seconds

00 - 90 Seconds

00 - 30 Seconds

00 - 90 Seconds

32 - 6 CPH

31 - 15 Minutes

32 - 6 CPH

31 - 15 Minutes

32 - 6 CPH

31 - 15 Minutes

Step

(Press

Mode

Fan)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

Installer’s Guide

2nd Stage Compressor

Heating Cycles Per Hour

2nd Stage Compressor Heating
Minimum On Time

1st Stage Heater

Cycles Per Hour

1st Stage Heater

Minimum ON Time

2nd Stage Heater

Cycles Per Hour

2nd Stage Heater

Minimum ON Time

3rd Stage Heater

Cycles Per Hour

3rd Stage Heater Minimum ON Time 3 1 - 15 Minutes

Control Response Rate 0 0=Normal, 1=Fast

Aggressive Recovery Due To A
Setpoint Change > 2 Degrees F

Remote Indoor Sensor 0 0=None,1=Has Sensor

Humidistat For Dehumidification 0 0=Disabled,1=Enabled

Wet Heat Blower ON Delay 30 0 - 60 Seconds

Wet Heat Blower OFF Delay 30 0 - 90 Seconds

Cooling Efficiency Booster - Single
Stage Compressor Only

Outdoor Sensor for Control ­Temperature Units (Steps 43-49)

Heat Pump Restricted Mode

Outdoor Temperature

Resume Heat Pump Operation
Outdoor Temperature

Heating Aggressive Recovery

Outdoor Temperature

Auxilliary Heat Lockout

Outdoor Temperature

W1 Heater Balance Point During
Defrost Outdoor Temperature

W2 Heater Balance Point During
Defrost Outdoor Temperature

W3 Heater Balance Point During
Defrost Outdoor Temperature

Exit Installer Setup
Press $ to advance to step 99

32 - 6 CPH

3 1 - 15 Minutes

32 - 6 CPH

3 1 - 15 Minutes

52 - 6 CPH

3 1 - 15 Minutes

52 - 6 CPH

0 0=Disabled,1=Enabled

0 0=Disabled,1=Enabled

0 0=Fahrenheit,1=Celsius

"--"

"--" = Disabled

then

10 to 70 Degrees F

40

4.5 -12 to 21 Degrees C

"--"

"--" = Disabled

then

14 to 74 Degrees F

44

6.5 -10 to 23 Degrees C

"--"

"--" = Disabled

then

10 to 70 Degrees F

40

4.5 -12 to 21 Degrees C

"--"

"--" = Disabled

then

15 to 75 Degrees F

45

7 -9 to 24 Degrees C

"--"

"--" = Disabled

then

-10 to 55 Degrees F

55

13 -23 to 13 Degrees C

"--"

"--" = Disabled

then

-10 to 55 Degrees F

40

4.5 -23 to 13 Degrees C

"--"

"--" = Disabled

then

-10 to 55 Degrees F

25

-4 -23 to 13 Degr ees C

SA = Save

CA = Cancel

SA

CL = Clears History and Service Data only

CS = Clears Setups

FA = Fa c to r y D efa ul t

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

43

44

45

46

47

48

49

99

(Exit)

12 Pub. No. 18-HD29D3-4

TABLE 3A USER SETUP (USU)

Press and hold MODE and FAN at the same time.

Menu Item Default Setting (Choices)

Temperature Display 0 0=Fahrenheit,1=Celsius 50

Auto or Manual Changeover 1 0=Manual,1=Auto 51

Setpoint Deadband 3 2 - 10 Degrees Fahrenheit

Waiting Icon 1 0=Disable,1=Enable 53

Cooling Droop 1 0 = Off

Energy Savings ­Cooling Setpoint Offset

Energy Savings ­Heating Setpoint Offset

Indoor Filter Timer Method 0 0=Calender Days,1=Fan RunTime

Indoor Filter Reminder - Days 30 1-180 Days,0=Disabled 58

Calibrate Indoor Temperature 0 Calibrated Room Temperature

Calibrate Outdoor Temperature 0 Calibrated Outdoor Temperature

Calibrate Remote
Indoor Temperature

Continous Fan Airflow 50% 35%-100% 62

Exit User Setup
(Press Mode)

(Press UP or DOWN arrow)

1.5 - 5.0 Degrees Celsius

1 = 1 Degree
2 = 2 Degrees

5 0 - 25 Degrees Fahrenheit

0 - 15 Degrees Celsius

5 0 - 45 Degrees Fahrenheit

0 - 25 Degrees Celsius

Days

+ / - 5 Degrees (1/2 degree
increments)

+ / - 5 Degrees (1/2 degree
increments)

0 Calibrated Room Indoor Temperature

+ / - 5 Degrees (1/2 degree
increments)

SA CA = Cancel

SA = Save
US = Default User Settings

Step

(Press

Mode or

Fan)

52

54

55

56

57

59

60

61

99

(Exit)

Installer’s Guide

Note: Pressing Energy Saving Key ($) anytime during setup will

advance to “Step 99”
Step 99 - Make setting selection and then press MODE to exit.
SA = SAves all current settings. Press MODE to exit.
CA = CAncels the current settings. Press MODE to exit.
FA = Resets all settings to FActory defaults and clears history and

service data from the EEPROM. Press MODE to restore

defaults and return to step 1 of Installer setup menu.
CL = CLears all history and service data counts. Press MODE to

clear all history and service data from EEPROM and return to

step 1 of installer setup menu.
CS = Clears Setup to Installer (steps 1 - 49) and User (steps 50 -

69) settings. Installer settings shall be restored to factory

settings and User settings shall be restored to defaults. Press

MODE to save selections and return to step 1 of Installer setup

menu.
US = Restores the USer default settings. Press MODE to exit.
Note: The User (US) exit option in the User menu will not restore

Installer settings.

Steps 16 & 18: With BK Output disabled, do not select a Comfort

Control Blower On-Delay if an Enhanced (Comfort-R) airflow

profile is selected at the variable speed indoor unit.
Steps 17 & 19: With BK Output disabled, do not select a Comfort

Control Blower Off-Delay if a blower off delay is selected at the

indoor unit.
Step 5 System Type = 1 (AC): Steps 15, 18-19, 24-27, 41-49 not

available.

Step 5 = 1 and Step 9 = 0 (0H/1C): Steps 51-52 not available.
Step 5 = 2 and Step 8 = 1 (Dual Fuel): Step 47 not available.
Step 5 = 2 (HP): Step 6 (Compressor Stages) cannot be set to “0”.
Changing Step 5 to “2” will force the settings for Steps 6, 8, and 9.
Step 6 Compressor Stages = 0 (None): Steps 7, 12-27, 35, 37, 40-

49, 51-52, 54 not available.

Step 6 Compressor Stages = 1 (Single Stage): Steps 7, 14, 22-23,

26-27 not available.

Step 6 Compressor Stages = 2 (Two Stage/Two Step): Step 40 not

available.
Step 8 Heater Type = 1 (Gas/Oil): Steps 38-39 not available.
Step 8 Heater Type = 2 (Electric): Steps 38-39 not available.
Step 8 Heater Type = 3 (Wet Heat): Steps 32-33, 49 not available.
Step 9 Heater Stages = 0 (None): Steps 28-33, 38-39, 43-44, 46-49

not available.
Step 9 Heater Stages = 1 (Single Stage): Steps 30-33, 48-49 not

available.
Step 9 Heater Stages = 2 (Two Stage): Steps 32-33, 49 not

available.
Step 10 Outdoor Sensor = 0 (None): Steps 40-49, 60 not available.
Step 10 Outdoor Sensor = 1 (Display Only): Steps 41-49 not

available.
Step 11 BK Output = 0 (BK Disabled): Steps 12-15, 40 not available.
Step 11 BK Output = 1 (BK Enabled): Steps 16-19 not available.
Step 36 Remote Indoor Sensor = 0 (None): Step 61 not available.
Step 43 HP Restricted Mode = “—“: Step 44 not available.

Step 5 = 1 and Step 6 = 1 (1C): Step 35 not available.
Step 5 = 2 and Step 6 = 1 and Step 9 = 0 (1H/1C HP): Steps 35, 45

not available.

Pub. No. 18-HD29D3-4 13

Table 4 Troubleshooting

Symptom Possible Cause Action

Installer’s Guide

Display will not come on.

Indoor temperature display is
incorrect.

Outdoor temperature display is
incorrect.

Outdoor temperature display
shows "--" and Service indicator
on solid.

Cannot set Heating setpoint
above 80 degrees

Service indicator flashing on and
off at ISU steps 5 and 8 or Service
and Heat indicators flashing on
and off.

Service indicator flashing on and
off.

Service indicator solid on and "--"
in temperature display.

Temperature setting will not
change. (Example: Cannot set
heating higher or cooling lower).

Room temperature overshoots
when Energy Savings Key ($) is
used or the Heat/Cool settings is
changed more than 2 degrees.

Heating will not come on.

Cooling will not come on.

Cool ON or Heat ON is displayed,
but no warm or cool air is coming
from the registers.

Control does not respond to
keypad presses.

Fan does not operate properly in
heat or cool mode.

1. Blown fuse or tripped circuit breaker.

2. Furnace power switch OFF.

3. Furnace blower compartment door or panel
loose or not properly installed.

Temperature display needs calibration. Calibrate Sensor - User Setup Step 59.

Temperature display needs calibration.

1. Outdoor temperature sensor open or shorted.

2. Outdoor sensor field wiring open or shorted.

Deadband between Heating and Cooling set to high. Decrease Deadband setting - User Setup Step 52.

JP1 Dual Fuel jumper setting does not agree with
ISU selections.

Control EEPROM write error. Press any key and Check / Re-enter Setup Choices.

Indoor temperature sensor open or shorted. Replace Control

1. Upper and/or lower temperature limits were
reached.

2. "Keypad locked" is displayed on LCD.

Oversized heating or cooling equipment. Control
cannot respond fast enough to prevent
overshooting.

1. System Mode not set to Heat.

2. Minimum off time delay being enforced.

3. Loose connection to control or system.

4. Heating system requires service or
control requires replacement.

1. System Mode not set to Cool.

2. Minimum off time delay being enforced

3. Loose connection to control or system.

4. Cooling system requires service or
control requires replacement.

1. The heating equipment turns on the
fan when the furnace has warmed up to a
setpoint.

2. Heating or cooling equipment is not
operating.

1. "Keypad locked" is displayed on LCD.

2. Keypad failure.

1. Incorrect wiring.

2. Heating or cooling equipment inoperative.

1. Replace fuse or reset breaker.

2. Turn switch to ON.

3. Replace door panel in proper position to engage safety interlock or
door switch.

1. Calibrate Sensor - User Setup Step 60.

2. Disconnect outdoor sensor from controls terminal block and check the
sensor and field wiring resistance value - Table 2.

1. Replace outdoor sensor.

2. Check / repair outdoor sensor field wiring.

Cut JP1 for Dual Fuel applications.

1. Check the temperature setpoints:
Heating limits are 40 - 85F.
Cooling limits are 65 - 90F.

2. Unlock keypad - press Up+Down arrow together until icon disappears.

Set Control Response rate to "Fast" - ISU Step 34.

1. Set Mode to heat and raise the setpoint above room temperature.

2. If heating does not come on within 5 minutes, Check Heating.

3. Check / Repair connections.

4. Repair system / Replace control.

1. Set Mode to cool and lower the setpoint below room temperature.

2. If cooling does not come on within 15 minutes, contact servicer.

3. Repair connections.

4. Repair system / Replace control.

1. Wait one minute after Heat ON is displayed
and then check the registers.

2. Check Heating and Cooling system.

1. Unlock keypad - press Up+Down arrow together until "Keypad locked"
disappears.

2. Replace Control.

1. Correct wiring.

2. Repair system.

Fan runs all the time.

Cooling cycle too fast or too slow.
(Narrow or wide temperature
swing).

Heating cycle too fast or too slow.
(Narrow or wide temperature
swing).

ROOM and SERVICE icon flashing
while continuing to display indoor
room temperature

1. Fan mode set to ON.

2. Shorted control wiring.

The location of the control and/or the size of the
cooling system may be influencing the cycle rate.

The location of the control and/or the size of the
heating system may be influencing the cycle rate.

The installer has selected remote indoor sensor in
ISU 36 but has none connected, a wire is broken/not
connected or the sensor has failed open. This
control will default to the on-board sensor if a
remote indoor sensor were hooked up and failed to
report properly.

1. Set fan mode to AUTO.

2. Check / Repair wiring.

Verify cycle rate adjustment ISU Steps 20 & 22.

Verify cycle rate adjustment ISU Steps 24.26.28.30 & 32.

Select proper option for ISU 36, repair wire, connection, or sensor.

14 Pub. No. 18-HD29D3-4

Installer’s Guide

Features

BK Output

With the BK Output enabled (the factory default) the
Comfort Control sends a Pulse Width Modulated (PWM)
signal to Variable Speed indoor units for directly
controlling the indoor air flow between 35% and 100%.

With the BK Output enabled, the following features
are available:

• Simplified control wiring for two step and two

stage equipment

• Cooling Efficiency Booster for single stage

equipment (ISU Step 40)

• User selectable Continuous Fan air flow rate

• A wider selection of turn-on and turn-off delay

profiles selectable from the Comfort Control (ISU
Steps 12 & 13)

• Warm Air Discharge mode for heat pump heating

(ISU Step 15)

• Reduced air flow during Cooling Droop

• Enhanced humidity removal when using a

humidistat connected to the Comfort Control (ISU
Step 37)

• Variable air flow control for Wet Heat heating

applications

• Installer selectable first stage compressor air flow

(ISU Step 14)

When the BK Output is used, the 350/400/450 cfm/ton
setting on the variable speed indoor unit still applies for
determining the final air flow.

NOTE: In order to use the BK Output, the R to BK jumper
must be cut or removed, the indoor unit dip switches 5 & 6
should be set to the OFF position, the “Y” terminals on the
indoor unit are NOT connected, and a BK wire must be
added from the Comfort Control to the Variable Speed
indoor unit.

When the BK Output is disabled, there is not a PWM
signal from the Comfort Control, and standard 24V
connections are made to the Y1 and Y2 terminals of the
indoor unit for determining the indoor air flow.

Adjustable Continuous Air flow – BK Enabled

The Continuous Fan air flow is user adjustable from 35%
to 100% in 5% increments either by entering User Setup
Mode or by holding down the Fan key for a few seconds
(Quick Setup).

Heat Pump Warm Air Discharge - BK Enabled

The indoor air flow is reduced to 77% for each compressor
heating stage for delivery of warmer discharge air.

Cooling Efficiency Booster - (Single Stage Compressor
Only) - BK Enabled

The indoor air flow is reduced to 80% at outdoor
temperatures below 87°F in cooling mode. The outdoor
temperature sensor must be installed and enabled in ISU
Step 10.

Control Response Rate

A set of higher gain Proportion-Integral control constants
can be chosen to increase the responsiveness of the
temperature control performance.

Cycle Rate

The selected number of system cycles per hour. If the cycle
rate were set to 3, each cycle would be 20 minutes long
when operating at a 50% load value. The total ON and/or
OFF times depends on actual indoor space load. A shorter
cycle rate (more cycles per hour) may be desired for Heating
in order to maintain a tighter control on indoor setpoint. A
longer cycle rate may be desirable for Cooling so the
system has the opportunity to remove moisture from the
air and improve indoor comfort.

Auto Changeover

When the system mode is set to AUTO, the control
automatically switches between heating and cooling modes
to maintain the desired comfort level.

Setpoint Deadband

The number of degrees separating Heating and Cooling
setpoints. The amount of separation between mode
setpoints is user defined between 2 and 10 degrees. When
the control is set to AUTO, and the cooling setpoint is
changed to a cooler setting, the heating setpoint also
changes to maintain the selected degrees separation. The
same action occurs when the heating setpoint is changed to
a warmer temperature.

Backlit Display & Keys

The liquid crystal display and the keypad will illuminate
whenever a keypad button is pressed to improve control
visibility. The back light stays on for 20 seconds after the
last key press.

Cooling Droop

Cooling Droop is an automatic function that cycles the
compressor on to improve indoor comfort by removing
moisture from the air. The Droop cycle is activated when
the room temperature is at or below the cooling setpoint.
When this function is active, the control will control
temperature at 1 or 2 degrees below cooling setpoint. The
Droop cycle is deactivated when the temperature rises
above the cooling setpoint. When the BK output is
enabled, the air flow is reduced to 80% during cooling droop
operation.

Aggressive Recovery

The 10 minute delay between compressor stages and
between the highest compressor stage and the first stage of
auxiliary heat is defeated when there is a setpoint change
resulting in a temperature error of 2 degrees or more. ISU
Step 35 is for both heating and cooling, and overrides ISU
Step 45 when enabled.

Pub. No. 18-HD29D3-4 15

Installer’s Guide

Energy Savings $
The Energy Savings mode provides energy savings by
offsetting the indoor setpoint to a cooler temperature
setting for heating and a warmer temperature setting for
cooling.

The Energy Savings mode is activated by pressing the
Energy Savings key “$” on the control’s keypad. Pressing
the Energy Savings key “$” again deactivates the Energy
Savings mode. Pressing and holding the Energy Savings
key “$” provides quick access to the setpoint offset for both
heating and cooling.

Filter Reminder

“FILTER” will automatically flash to remind the
homeowner that its time to change the filter once the
preset time has expired. Pressing the “Filter/OD” keypad
button resets the internal clock timer. Once the timer has
been reset, the number of days remaining until the next
filter change can easily be determined by simply pressing
the “Filter/OD” keypad button once more. Pressing and
holding the “Filter/OD” keypad button provides quick setup
access to the filter timer value.

Keypad Lock

Locking the control’s keypad can help prevent unwanted
tampering or changing the thermostat settings by pressing
the controls UP and DOWN arrow keypad buttons at the
same time and holding for 2 seconds. “Keypad Locked”
will be displayed on the LCD. Repeating this combination
unlocks the keypad and the “Keypad Locked” will
disappear.

Business Card Drawer

The drawer attached to the mounting base of the control is
designed to provide a convenient location for the home
owner to locate their local servicer. A standard business
card can be folded and inserted into the slot on the drawer
to remind the User whom to call when service is required.

Manual Test Mode

The built in Manual Test Mode allows the servicer to
quickly and easily test the control’s individual control
outputs and makes diagnostic procedures a snap. Set the
Mode to OFF, set the fan to AUTO, and press the MODE
and DOWN arrow keypad buttons at the same time and
hold for 2 seconds. See Table 1, steps 70-78 for details.

Default Factory Settings

The thermostat is shipped with a set of factory default
settings. The factory default settings can be restored at
any time using the control configuration menu. (See Table
3, step 99).

Service Indicator

The “SERVICE” indicator automatically flashes when an
internal fault or error has been detected by the Comfort
Control.

Minimum Off Time Delay Override

Minimum Off time delays can be overridden for the current
cycle by pressing the Mode and Down arrow keys at the
same time for approximately 2 seconds. It may be
necessary to lower the indoor setpoint for cooling or
increase the setpoint for heating to activate the system.
Minimum off time delays will be enforced on the next cycle.

Wait Indicator

“Waiting” will illuminate when the indoor setpoint is
moved in the direction of calling for additional system
capacity. “Waiting” indicates system time delays are being
enforced and that the control is adjusting to the new
settings.

Calibrate Indoor Temperature

This option allows calibration of the room temperature
sensor. The selected number is number of degrees, plus or
minus, which will be added to the actual temperature. The
number can range between + 5 and - 5 degrees in 1/2 degree
increments. Factory default is 0. The adjusted value will be
used as the temperature for both display and control
action. For example, if 2 is selected, 72 degrees actual will
read 74 degrees.

Calibrate Outdoor Temperature

This option allows calibration of the outdoor temperature
sensor. The selected number is number of degrees, plus or
minus, which will be added to actual temperature. The
number can range between + 5 and - 5 degrees in 1/2 degree
increments. Factory default is 0. This adjusted value will
be used as the temperature for both display and control
action. For example, if 2 is selected, 72 degrees actual will
read 74 degrees.

Outdoor Temperature Sensor

With the outdoor sensor installed and enabled, outdoor
temperature can be displayed on the Comfort Controls
display by simply pressing the Filter/OD button. Also, the
outdoor sensor is required for the following control
features: Cooling Efficiency Booster, Heat Pump Restricted
Mode, Heating Aggressive Recovery, Auxiliary Heat
Lockout, and Defrost Heater Balance Point control.

Optional Remote Indoor Temperature Sensor
Accessory

With the remote indoor temperature sensor installed and
enabled, the Comfort Control can display and control
indoor temperature at a more optimum location without
moving the mounting location of the Comfort Control. If
the remote indoor temperature sensor fails, control reverts
to the on-board temperature sensor. Therefore, the
Comfort Control must be installed in the conditioned
space.

Calibrate Remote Indoor Temperature

This option allows calibration of the remote indoor
temperature sensor. Otherwise this feature operates the
same as for calibration of the indoor (on-board)
temperature sensor.

16 Pub. No. 18-HD29D3-4

Optional Humidistat Accessory

The optional humidistat connects to subbase terminals H1
and H2 and opens on a rise in humidity. The Comfort
Control provides dehumidification only during cooling mode
operation as described below.

• Variable Speed Dehumidification – BK

Enabled

Extends the compressor runtime by two minutes
to remove additional moisture from the indoor air.
Defeats the blower turn-off delay.
Reduces the indoor air flow to 80% when the room
temperature is within 2 degrees of the setpoint
and when the room temperature is below the
setpoint.

• Non-Variable Speed Dehumidification – BK

Disabled

Extends the compressor runtime by two minutes
to remove additional moisture from the indoor air.
Defeats the blower turn-off delay.
Applies the greater of the blower turn-on delay, or
30 seconds maximum blower turn-on delay based
on how long the compressor has been off.

Wet Heat

A hot water coil can be applied with a variable speed or
non-variable speed indoor unit to provide heat or to provide
auxiliary heat for heat pumps. With either type of
equipment, the blower turn-on and turn-off delays apply to
the G output (ISU Steps 38 & 39).

• Variable Speed Wet Heat – BK Enabled

W1 turns on continuously for first stage and the
air flow is modulated based on the calculated load.
W2 is duty cycled for second stage based on the
calculated load while the air flow remains at
100%. The air flow during the fan off delay is at
35%.

• Non-Variable Speed Wet Heat – BK Disabled

W1 and W2 are duty cycled the same as for electric
heat operation.

Auxiliary Heat Lockout

Enabled by selecting an outdoor temperature. None of the
installed auxiliary heat stages will turn on during heating
operation above the selected outdoor temperature. During
defrost, this outdoor temperature setting is ignored and
the Defrost Heater Balance Point outdoor temperature
thresholds are used instead.

Installer’s Guide

Dual Fuel (Heat Pump with Fossil Fuel Auxiliary Heat)
NOTE: No external dual fuel kit (e.g. TAYPLUS103A) is
required for use with this Comfort Control. During the
transition from furnace operation to heat pump operation,
there is a minimum comfort control time delay of 45
seconds between the furnace turning off and the heat pump
turning on.

RESTRICTED MODE - (Requires Outdoor
Temperature Sensor)

The Heat Pump Restricted Mode Outdoor Temperature
changeover point (ISU Step 43) must be set at or above the
application or economic balance point of the system.

At any temperature above the Heat Pump Restricted Mode
Outdoor Temperature the comfort control will first attempt
to satisfy the heating load by operating the heat pump. If
the heat pump alone cannot satisfy the load, the comfort
control will transition to furnace operation and will turn off
the heat pump. The furnace may operate continuously or it
may cycle on and off as required to balance the load.

When the outdoor temperature drops below the ISU Step
43 setting, the comfort control will operate only the furnace
and the heat pump will be off. When the outdoor
temperature rises above the setting of the Resume Heat
Pump Operation Outdoor Temperature (ISU Step 44), the
system returns to heat pump operation if the building load
is relatively low.

The outdoor temperature sensor reading is compared to the
outdoor temperature changeover point once every 10
minutes. The Resume Outdoor Temperature can be set no
closer than 4 degrees above the Restricted Mode Outdoor
Temperature.

Placing the comfort control in Emergency Heat mode
converts the system to furnace only operation.

NOTE: Economic Balance Point is the outdoor
temperature at which it is more economical to use the
alternate fuel energy than the primary electric heat pump
energy. Application Balance Point is the outdoor
temperature below which the heat pump alone cannot
handle the load.

UNRESTRICTED MODE ­If the building load is relatively low such that the heat
pump alone can hand the building load, the comfort control
will operate the heat pump to maintain the room
temperature at the setpoint, independent of the outdoor
temperature.

Defrost Heater Balance Point Control

A separate outdoor temperature turn-on threshold can be
chosen for each installed heater stage during defrost. If not
enabled, that particular heater stage will be energized
during every defrost cycle independent of the outdoor
temperature. Once the defrost cycle terminates, the
comfort control load calculation will resume duty cycle
control of the heater stages. During defrost, the comfort
control will not cycle the heat pump off unless an indoor
temperature overshoot of 2.5 degrees or more above the
heating setpoint occurs.

Pub. No. 18-HD29D3-4 17

If the heat pump cannot handle the building load, the
comfort control will turn the heat pump off and will operate
the furnace. The furnace may operate continuously or it
may cycle on and off as required to balance the load.
Transition back to heat pump operation will occur when the
building load returns to a relatively low level.

Placing the comfort control in Emergency Heat mode
converts the system to furnace only operation.

Installer’s Guide

18 Pub. No. 18-HD29D3-4

Installer’s Guide

Pub. No. 18-HD29D3-4 19

Trane
6200 Troup Highway
Tyler, TX 75707

For more information contact
your local dealer (distributor)

Literature Order Number 18-HD29D3-4

File Number 18-HD29D3-4

Supersedes 18-HD29D3-3

Date 05/08

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