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Part No. 37-7760003

   09-2018   18-HD48D1-1A-EN 5

Mounting

Hole

Mounting

Hole

Place Level

across Mounting Tabs

(for appearance only)

Place Level
across Mounting Tabs 
(for appearance only)

+
S

HM

-

W/E

6

DHM

Y2

O/B

L

Y

W2

            THERMOSTAT REARVIEW

2 "AA" Batteries

Power 
Stealing 
Switches

Stack 

Power

Stealing 

Switch

FIGURE 2. THERMOSTAT BASE PLATE  

302 / 303

+

HM

S

-

W1

6

DHM

W2

Supplies voltage to remote temperature 
sensor

Remote Temperature Sensor Terminals

Supplies voltage to remote temperature 
sensor

Whole House Humidification (HM)

— 303 ONLY

Humidification Terminal, energizes 

on call for heat if humidity setpoint is 

above room humidity. Can also be 

used to provide humidification 

independnent of a call to heat and/or 

in cooling mode if Automatic 

Humidification is selected in 

Configuration Menu item #42

Enhanced Cooling 

Dehumidification (DHM) —303 ONLY

De-energizes on call for Dehumidification to 
lower the variable speed fan speed by 20%. 
The DHM terminal is only used on systems 
with a compatible dehumidification feature 
that has the required terminal connection on 
the control module or BK terminal on indoor 
models with variable speed blower motors. 

Y2

O/B

L

Y

+

HM

S
-

W1

6

DHM

W2

COOLING DEHUMIDIFICATION, HUMIDIFICATION, AND REMOTE TEMPERATURE SENSOR TERMINALS

FIGURE 3.  – TERMINAL DESIGNATIONS SINGLE STAGE OR MULTI-STAGE SYSTEM: 

Heat / Cool Systems

Single Stage 1

(SS1)

Multi Stage 2

(MS2)

System

RC

RH

C

Y

Y2

W/E

W2

G

O/B

6

L

Call for heat

Heat mode-1st

stage

Heat mode-2nd

stage

No output

24 volt 

power for 

cooling

24 volt 

power for 

heating

Cool mode-2nd

stage

24 volt 

common 

(optional 

for system 

operation, 

required 

for remote 

sensor)

Call for cool

No Output

Cool mode-1st

stage

Blower/Circulator fan

energized on a call 

for cool or Fan On

(also energized in

heating if configured

for Electric Heat)

Installer

Configuration

Menu selects 

“O” or “B” for 

changeover

function. Set 

to “O” terminal

energized in Cool

& Off mode. Set 

to “B” terminal

energized in 

Heat & mergency 

mode

Power closed

connection for

SPDT 3-wire

zone valve

Fault or System

Malfunction

Indicator for 

Heat Pumps

with “L” terminal

connection.

FIGURE 4.  – HEAT PUMP SYSTEMS

Heat

Pump 1

(HP1)

Heat 

Pump 2

(HP2)

System

RC

RH

C

Y

Y2

*W/E

*W2

G

O/B

6

L

Heat mode-2nd

stage, Emergency

Mode-1st stage

*Note: Dual Fuel

option de-

energizes Heat

mode stage 1

(compressor)

when auxiliary

heat is energized

Heat mode-3rd

stage, Emergency

Mode-1st stage

*Note: Dual Fuel

option de-

energizes Heat

mode stages 1 

and 2 (both

compressors)

when auxiliary

heat is energized

Heat mode-4th

stage, Emergency

Mode-2nd stage

*Note: Dual Fuel

option de-

energizes Heat

mode stages 1 

and 2 (both

compressors)

when auxiliary

heat is energized

Heat mode-3rd

stage, Emergency

Mode-2nd stage

*Note: Dual Fuel

option de-

energizes Heat

mode stage 1

(compressor)

when auxiliary

heat is energized

24 volt 

power for 

cooling

24 volt 

power for 

heating

Heat mode-2nd 

stage, 

Cool mode-2nd 

stage, 

(Compressor)

No Output

24 volt 

common 

(optional 

for system 

operation, 

required 

for remote 

sensor)

Heat mode-1st

stage,

Cool mode-1st

stage,

(Compressor)

Blower/Circulator fan

energized on a call 

for cool or Fan On

(also energized in

heating if configured

for Electric Heat)

Installer

Configuration

Menu selects 

“O” or “B” for 

changeover

function. Set 

to “O” terminal

energized in Cool

& Off mode. Set 

to “B” terminal

energized in 

Heat & mergency 

mode

Power closed

connection for

SPDT 3-wire

zone valve

Fault or System

Malfunction

Indicator for 

Heat Pumps

with “L” terminal

connection.

Summary of Contents for TCONT302

Page 1: ...s Document is customer property and is to remain with this unit These instructions do not cover all variations in systems or provide for every possible contingency to be met in connection with the ins...

Page 2: ...lighting ballasts and large distribution panels Failure to follow these wiring practices may introduce electrical interference noise which can cause erratic system operation All unused thermostat wir...

Page 3: ...Pump 1 2 F 1 7 F Emer Heat 0 6 F 1 7 F THERMOSTAT APPLICATION GUIDE Thermostat Configuration Options Thermostat Applications Maximum Stages Heat Cool Single Stage 1 No Heat Pump SS1 Gas Oil Electric...

Page 4: ...he thermostat will cause damage to the unit 4 Place base over hole in wall and mark mounting hole locations on wall using base as template See Fig 1 5 Move base out of the way Drill mounting holes If...

Page 5: ...or Call for cool No Output Cool mode 1st stage Blower Circulator fan energized on a call for cool or Fan On also energized in heating if configured for Electric Heat Installer Configuration Menu selec...

Page 6: ...Installation and User Guide 6 Part No 37 7760003 09 2018 18 HD48D1 1A EN 5 Wiring Diagrams...

Page 7: ...Part No 37 7760003 09 2018 18 HD48D1 1A EN 7 Trane XR302 and XR303 Touchscreen Thermostat...

Page 8: ...remote indoor or outdoor wired sensor FOOTNOTES 1 A TCONT302 does not include humidifier HM and dehumidifier DHM terminals AC Cooling with GAF2 S Thermostat Thermostat Indoor Caution Do not run Outdoo...

Page 9: ...dehumidifier DHM terminals 2 Wire third party condensate overflow switches between Y of the thermostat and Y1 of the airflow control board 3 X2 is required for aux heat signal during defrost 4 Factor...

Page 10: ...Installation and User Guide 10 Part No 37 7760003 09 2018 18 HD48D1 1A EN...

Page 11: ...at during defrost 4 Factory installed jumper Heat Pump with GAF2 S Thermostat Indoor Unit Outdoor Unit Caution Do not run Outdoor Remote sensor wires in the same bundle with HVAC wires Also keep away...

Page 12: ...ge Unit with Variable Speed Blower Thermostat Thermostat Package Unit BK X2 Y1 G R B W1 O B L Y2 Y G Rc Rh C S HM W2 W E 6 DHM Optional remote indoor or outdoor wired sensor FOOTNOTES 1 A TCONT302 doe...

Page 13: ...to replace UV lamp 6 COPY key or INSTALLER CONFIG key 7 CLEAN DISPLAY key allows 30 seconds to wipe off the display or ADVANCE DAY key for programming 8 Used in programming to set time and in configu...

Page 14: ...r HP2 is selected above 4 Days 7 P 5 or 0 Programs per week 7 days 5 1 1 days or non programmable 5 4 PS 2 Programs per day 4 Morning Day Evening Night 2 Day Night Not available if 4 is 0 6 Cool Off H...

Page 15: ...MODEL FOR THE CORRECT SCREEN REFERNCE NUMBER N A 38 80 bP 79 20 Selects Blower balance point Selection of 80 disables this feature This item appears if HP1 or HP2 is selected and outdoor sensor is ins...

Page 16: ...five minutes 13 Select Continuous Display Lighting dL In low lighting conditions display backlight improves the display contrast 14 Select Temperature Display Adjustment 5 LO to 5 HI This allows you...

Page 17: ...itional heat stages to come on quickly when is used to raise the temperature a few degrees above the room Select this setting if you want the heat to increase quickly when you manually raise the tempe...

Page 18: ...er is controlled by the thermostat It is recommended for use on flow through humidifiers only The display indicates CH Cycle Humidifier with the default indicating OFF Pressing the or keys will toggle...

Page 19: ...lect EM EM Heat Mode will flash on the display 8 Press to adjust thermostat setting above room temperature The Emergency heating system will begin to operate The display will show System On flashing E...

Page 20: ...nstaller menu Then press Set Time once to indicate hour AM or PM designation in clock display 2 Press and hold either the or touch key until you reach the correct hour and AM or PM designation 3 Press...

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