Heat/Cool Applications; Stage; System: Heat / Cool Systems - Trane TCONT302 Installation And User Manual

FIGURE 2. THERMOSTAT BASE PLATE 302 / 303
Mounting
O/B
L
Hole Y2
Y
Place Level
across Mounting Tabs
(for appearance only)
COOLING DEHUMIDIFICATION, HUMIDIFICATION, AND REMOTE TEMPERATURE SENSOR TERMINALS
FIGURE 3. – TERMINAL DESIGNATIONS SINGLE STAGE OR MULTI-STAGE SYSTEM:
System
RC
Single Stage 1
(SS1)
24 volt
power for
cooling
Multi Stage 2
(MS2)
System
Heat
Pump 1
(HP1)
Heat
Pump 2
(HP2)
09-2018 18-HD48D1-1A-EN
Part No. 37-7760003
+
Mounting
S
- Hole
HM
W2
W/E
6
DHM
Place Level
across Mounting Tabs
(for appearance only)
+
O/B
S
L
-
Y2
HM
Y
W2
W1
6
DHM
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
Con guration Menu item #42
Y2
RH C Y
Call for cool No Output
24 volt
common
(optional
24 volt
for system
power for
operation,
heating
required
Cool mode-1st Cool mode-2nd
for remote

stage

stage
sensor)
FIGURE 4. – HEAT PUMP SYSTEMS
RC RH C Y Y2
No Output
24 volt
common
Heat mode-1st
(optional
24 volt 24 volt stage,
for system
power for power for Cool mode-1st
operation,
cooling heating
stage,
required
(Compressor)
for remote
sensor)
Heat mode-2nd
stage,
Cool mode-2nd
stage,
(Compressor)
THERMOSTAT REARVIEW
+
Supplies voltage to remote temperature
sensor
S
Remote Temperature Sensor Terminals
Supplies voltage to remote temperature
-
sensor
HM
Enhanced Cooling
W2 Dehumidification (DHM) —303 ONLY
De-energizes on call for Dehumidification to
lower the variable speed fan speed by 20%.
W1
The DHM terminal is only used on systems
with a compatible dehumidification feature
6
that has the required terminal connection on
the control module or BK terminal on indoor
models with variable speed blower motors.
DHM
W/E W2 G
Call for heat No output
Blower/Circulator fan
energized on a call
for cool or Fan On
(also energized in
heating if configured
Heat mode-1st Heat mode-2nd
for Electric Heat)
stage stage
*W/E *W2 G
Heat mode-2nd Heat mode-3rd
stage, Emergency stage, Emergency
Mode-1st stage Mode-2nd stage
*Note: Dual Fuel *Note: Dual Fuel
option de- option de-
energizes Heat energizes Heat
mode stage 1 mode stage 1
(compressor) (compressor)
when auxiliary when auxiliary
Blower/Circulator fan
heat is energized heat is energized
energized on a call
for cool or Fan On
(also energized in
Heat mode-3rd Heat mode-4th energized in Cool
heating if configured
stage, Emergency stage, Emergency
for Electric Heat)
Mode-1st stage Mode-2nd stage
*Note: Dual Fuel *Note: Dual Fuel
Heat & mergency
option de- option de-
energizes Heat energizes Heat
mode stages 1 mode stages 1
and 2 (both and 2 (both
compressors) compressors)
when auxiliary when auxiliary
heat is energized heat is energized
Stack
Power
Stealing
Switch
Heat / Cool Systems
O/B 6
Installer
Configuration
Fault or System
Menu selects
Malfunction
"O" or "B" for
Indicator for
changeover
Power closed
Heat Pumps
function. Set
connection for
with "L" terminal
to "O" terminal
SPDT 3-wire
connection.
energized in Cool
zone valve
& Off mode. Set
to "B" terminal
energized in
Heat & mergency
mode
O/B 6 L
Installer
Configuration
Fault or System
Menu selects
Malfunction
"O" or "B" for
Indicator for
changeover
Power closed
Heat Pumps
function. Set
connection for
with "L" terminal
to "O" terminal
SPDT 3-wire
connection.
zone valve
& Off mode. Set
to "B" terminal
energized in
mode
2 "AA" Batteries
Power
Stealing
Switches
L
5