Trane 824 Comfort Control Installation Manual
824 Comfort Control
Installation Guide
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
IMPORTANT — This 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 installation. Should further information be desired or should particular problems arise which are not covered sufficiently
for the purchaser’s purposes, the matter should be referred to your installing dealer or local distributor.
WORKS WITH
18-HD72D1-1
Installation Guide
Contents
1. Safety ...................................................................... 2
2. Product Specifications .......................................... 3
3. General Information ............................................... 3
3.1 Overview ....................................................... 3
3.2 Features ........................................................ 3
3.3 Contents ........................................................ 3
4. Installation .............................................................. 4
4.1 Location ......................................................... 4
4.2 Network Connections .................................... 4
4.3 Mounting ....................................................... 4
4.4 Wiring ............................................................ 5
4.5 Heating and Cooling Applications ................. 7
4.6 Heat Pump Applications .............................. 14
4.7 Dual Fuel Applications ................................ 18
5. System Setup ....................................................... 21
5.1 Power-Up Sequence ................................... 21
5.2 Open ........................................................... 21
5.3 Installer Settings .......................................... 21
5.3.1 Installer Presets .......................................... 21
5.3.2 Installer Setup Standard Settings ................ 23
5.3.3 Advanced Settings — Equipment ................ 23
5.3.4 Advanced Settings — Accessories ............. 23
5.3.5 Advanced Settings — Comfort .................... 24
5.3.6 Advanced Settings — Airflow ...................... 25
5.3.7 Advanced Settings — Sensors .................... 26
5.3.8 Advanced Settings — Lockouts................... 26
5.4 Reminders ................................................... 26
5.5 Dealer Code ................................................ 26
6. Basic Operation ................................................... 29
6.1 PI Control .................................................... 29
6.2 Load Value................................................... 29
6.3 Duty Cycles ................................................. 29
6.4 Overshoot Clamp ........................................ 29
6.5 Stage Thresholds ........................................ 29
6.6 Stage Inhibits .............................................. 30
6.7 Aggressive Recovery .................................. 30
6.8 System Mode .............................................. 30
6.9 Fan Mode .................................................... 30
6.10 Air Cleaner Mode ........................................ 30
7. Advanced Operation ............................................ 31
7.1 Dehumidification .......................................... 31
7.2 Warm Air Discharge .................................... 31
7.3 Lockouts ...................................................... 31
7.4 Control Response Rate ............................... 31
7.5 Aux Contacts .............................................. 31
7.6 Stand Alone Operation ................................ 31
8. Diagnostic Tools ................................................... 32
8.1 Test Modes. ................................................. 32
8.2 Data Logging ............................................... 32
8.3 Diagnostics .................................................. 32
8.4 History ......................................................... 32
9. Notices .................................................................. 37
9.1 FCC Notice .................................................. 37
9.2 ICC Notice ................................................... 37
9.3 Warranty ...................................................... 38
1. Safety
!
▲
This information is intended for use by individuals
possessing adequate backgrounds of electrical and
mechanical experience. Any attempt to repair a central
air conditioning product may result in personal injury and/
or property damage. The manufacturer or seller cannot
be responsible for the interpretation of this information,
nor can it assume any liability in connection with its use.
▲
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.
page 2 18-HD72D1-1
WARNING
!
WARNING
NOTE: Use 18-gauge color-coded thermostat cable for
proper wiring. Shielded cable is not typically required.
Keep this wiring at least one foot away from large inductive
loads such as Electronic Air Cleaners, motors, line starters,
lighting ballasts and large distribution panels.
Failure to follow these wiring practices may introduce
electrical interference (noise) which can cause erratic
system operation.
All unused thermostat wire to be grounded at indoor unit
chassis ground only. Shielded cable may be required if the
above wiring guidelines cannot be met. Ground only one
end of the shield to the system chassis.
824 Programmable Comfort Control
2. Product Specifications
SPECIFICATION DESCRIPTION
Product Model TCONT824
Product XL 824 Comfort Control
Size 5-1/2” x 3-3/8” x 1” (WxHxD)
Storage/Operating Temperature -40°F to 175°F, 5% to 95% RH non-condensing
Input Power 24VAC
Power Consumption 7VA*
Wire Usage 18ga
System Modes Auto, Heating, Cooling, Off, Emergency Heat
Fan Modes Auto, On, Circulate
Cooling Setpoint Temperature Range 60°F to 99°F, 1 °F resolution
Heating Setpoint Temperature Range 55°F to 90°F, 1 °F resolution
Indoor Temperature Display Range 20°F to 119°F
Outdoor Temperature Display Range -31°F to 119°F
Indoor Humidity Display Range 0% to 99%, 1°F resolution
Minimum Cycle Off Time Delay Compressor: 5 minutes, Indoor Heat: 1 minute
*On every application, 24VAC loads should be reviewed to be sure the indoor unit control power transformer is adequately sized.
3. General Information
3.3 Contents
— 1-Control
3.1 Overview
The 824 Programmable Control has a 4-1/2”-inch color
touch screen and offers a full-featured and easy-touse interface. From individual daily schedules to WiFi™
enabled remote access, the 824 Control is one of the most
advanced 24VAC Controls available today.
3.2 Features
— Nexia™ Home Intelligence included
— WiFi Enables
— Weather Forecast (via wireless home network)
— 1-Sub-base
— 1-Screw Pack
— 2-#6 18X1 Phillips slotted head mounting screws
— 2-#6x1 Nylon Drywall Anchors
— 1-Installation Guide
— RJ-45 Holder and Screw
— 1-Quick Start Guide
— 1-USB OTG Adapter Cable (Micro-A plug to
Standard-A receptacle)
— Easy to program
— Allergy Clean/Quick Clean Cycles
— Interactive 4.5” Color Touchscreen
— 1-Touch Presets
— Built-in Help Screens
— Operating Runtime Analysis
— System Alerts
— Lock Screen Security
— Custom Screen Options
— Ten Year Registered Warranty
18-HD72D1-1 page 3
Installation Guide
Incorrect
Placement
of the 824
Ceiling Fan
Heat from the 824 screen may be
trapped within the body of the Control
by an external top-down airflow
source, such as a ceiling fan.
The onboard thermistor may be biased
by this heat causing the displayed
indoor temperature to be elevated.
4. Installation
4.1 Location
The 824 Control is designed for installation in climate
controlled living spaces. Place the unit in a central location
with good circulation.
For proper temperature sensing, avoid mounting the Control
where it will be exposed to heat radiated from lamps, sun
light, fireplaces or any other radiant heat source.
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 Control from being
directly exposed to air currents from supply registers or
ceiling fans.
Mount the Control on a section of interior wall that does not
contain hor or cold water pipes or duct work.
Important: The 824 Control utilizes a 4.5” color touch screen.
This screen generates heat which is vented out the top of
the Control utilizing natural convection. If an air source is
directed at or from above, heat from the screen can be
trapped within the Control body and can cause the indoor
temperature to be biased. Refer to “Figure 1. Placement of
the 824” on page 4
FIGURE 1. PLACEMENT OF THE 824
Correct
Correct
Placement
Placement
of the 950
of the 824
2 FEET
Optimum
Zone
Natural heat
dissapation
from the 824
Touch Screen
4.2 Network Connections
To take advantage of the full range of features on the 824
Control, it should be connected to the Internet. This is
possible using either a wireless or a wired connection.
Wireless Connections
If the 824 Control will be connected to the Internet using the
built-in wireless feature, choose a mounting location that
ensures adequate signal strength from the internet router.
Tips to Help Maximize Signal Strength:
— Do not mount the Control more than 30 feet from the
wireless router
— There should be no more than three interior walls
between the Control and the router.
— Do not mount the Control in areas where
electromagnetic emissions from other devices,
appliances or wiring can interfere with the Control’s
communication. (i.e. wireless phones, security
systems, wireless internet cameras).
— Do not mount the Control in recessed areas,
near metal objects, or near structures. (i.e. doors,
appliances, entertainment centers or shelving units).
— Do not mount the Control closer than 2 inches to any
pipes, duct work, or other metal obstructions.
— Do not have metal obstructions, concrete or brick
walls between the Control and the router it.
Wired Connections
The 824 Control may be connected to the Internet using its
built-in RJ-45 connector. When using a wired connection,
verify that a CAT 5 or better Ethernet cable with a male
RJ-45 connector is present from the router to the Control.
Onboard
5 FEET
Incorrect
Thermistor
Ceiling Fan
Placement
of the 824
Heat from the 824 screen may be
trapped within the body of the Control
by an external top-down airflow
source, such as a ceiling fan.
The onboard thermistor may be biased
by this heat causing the displayed
indoor temperature to be elevated.
4.3 Mounting
Follow these steps to mount the 824 Control to the wall.
1. Turn OFF all power to heating and cooling equipment.
2. If an existing thermostat is being replaced:
a. Remove the existing thermostat from the wall.
b. Record color and terminal marking of each wire.
c. Disconnect the wires from the existing thermostat
being careful not to allow them to fall back into
the wall.
3. Carefully pry the sub-base away from the 824 Control
using a small flat-blade screwdriver. Note that the
tight fit is normal and ensures that the Control is held
securely to the sub-base when mounted on the wall.
4. Route the thermostat wires through the opening on
the sub-base.
5. If using a wired Internet connection, route the Ethernet
cable through the opening.
6. Place the sub-base against the wall in the desired
location and mark the wall through the mounting
holes. If you are using a wired Internet connection,
be sure to mark the cutout for the RJ-45 Holder (see
“Figure 2. Mark the Mounting Holes”).
page 4 18-HD72D1-1
824 Programmable Comfort Control
RS1 RS1 ODT ODT W3 W2 W1 BK G Y2 Y1 O B/C RH RC AUX2 AUX1
Mounting Holes
Optional Mounting Hole
Thermostat
Wires
RJ-45
Plug
RS1 RS1 ODT ODT W3 W2 W1 BK G Y2 Y1 O B/C RH RC AUX2 AUX1
Mounting Holes
Optional Mounting Hole
Wall
Thermostat Wiring
Ethernet
Wiring
Thermostat
Wires
RJ-45
Plug
This side mounts to wall
Wall
a
b
c
d
7. Drill the holes in the wall where marked.
If you are using a wireless Internet connection, skip to
step 9.
8. If using a wired Ethernet connection, follow these
step and refer to “Figure 3. Attach RJ-45 Holder to
Sub-base”.
a. With the Sub-base and RJ-45 Holder oriented as
shown, press the holder into the Sub-base.
b. Slide the holder to the right so it snaps in place.
c. Secure the holder with the provided screw.
d. Insert the RJ-45 Connector into the RJ-45
Holder until it snaps into place.
9. Mount the sub-base to the wall using included
mounting screws and drywall anchors (if necessary).
An optional mounting hole is available for more secure
mounting, if needed. Make sure all wires extend
through the hole in the sub-base see “Figure 4. Mount
the Sub-base to the Wall”.
4.4 Wiring
1. Adjust the length and position of each wire to reach
the proper terminal on the connector block of the
sub-base. Strip 1/4” of insulation from each wire.
Do not allow adjacent wires to short together when
connected.
2. Match and connect control wires to the proper
terminals on the connector block. Refer to Field Wiring
Diagrams included in this document.
3. Push excess wire back into the wall and seal the
hole to prevent air leaks. NOTE: Air Leaks in the wall
behind the Control can cause improper operation.
4. Attach the Control to the sub-base.
5. Turn ON power to the heating and cooling equipment.
FIGURE 3. ATTACH RJ-45 HOLDER TO SUB-BASE
FIGURE 4. MOUNT THE SUB-BASE TO THE WALL
FIGURE 2. MARK THE MOUNTING HOLES
18-HD72D1-1 page 5
Installation Guide
Field Wiring Connection Diagrams
Heat/Cool Diagrams
PAG E DIAGRAM DESCRIPTION
7 DIAGRAM 1 1 OR 2 STAGE COOLING W/TAM7 MODEL VARIABLE SPEED AIR HANDLER
7 DIAGRAM 2 1 STAGE COOLING W/GAM5A OR TAM4 MODEL AIR HANDLER
8 DIAGRAM 3 1 STAGE COOLING W/GAM5B MODEL VARIABLE SPEED AIR HANDLER
8 DIAGRAM 4 2 STAGE COOLING W/GAM5B MODEL AIR HANDLER
9 DIAGRAM 5 1 STAGE COOLING W/GAF2-S MODEL AIR HANDLER
9 DIAGRAM 6 1 STAGE COOLING W/GAF2-36M MODEL AIR HANDLER
10 DIAGRAM 7 1 STAGE COOLING W/GAT2 & GAM2 MODEL AIR HANDLER
10 DIAGRAM 8 1 STAGE COOLING W/TEM3 MODEL AIR HANDLER
11 DIAGRAM 9 1 STAGE COOLING W/NON-VARIABLE SPEED GAS FURNACE
11 DIAGRAM 10 1 OR 2 STAGE COOLING W/VARIABLE SPEED GAS FURNACE
12 DIAGRAM 11 1 STAGE COOLING W/NON-VARIABLE SPEED OIL FURNACE
12 DIAGRAM 12 1 OR 2 STAGE COOLING W/VARIABLE SPEED OIL FURNACE
13 DIAGRAM 13 PACKAGE SINGLE OR MULTI-STAGE HEAT/COOL W/VARIABLE SPEED BLOWER
13 DIAGRAM 14 PACKAGE SINGLE-STAGE HEAT/COOL W/VARIABLE SPEED BLOWER
Heat Pump Diagrams
PAG E DIAGRAM DESCRIPTION
14 DIAGRAM 15 1 OR 2 STAGE HEAT PUMP W/TAM7 MODEL AIR HANDLER
14 DIAGRAM 16 1 STAGE HEAT PUMP W/GAM5A & TAM4 MODEL AIR HANDLER
15 DIAGRAM 17 1 STAGE HEAT PUMP W/GAM5B MODEL AIR HANDLER
15 DIAGRAM 18 2 STAGE HEAT PUMP W/GAM5B MODEL AIR HANDLER
16 DIAGRAM 19 1 STAGE HEAT PUMP W/GAF2-S MODEL AIR HANDLER
16 DIAGRAM 20 1 STAGE HEAT PUMP W/GAF2-36M MODEL AIR HANDLER
17 DIAGRAM 21 1 STAGE HEAT PUMP W/GAT2 & GAM2 MODEL AIR HANDLER
17 DIAGRAM 22 1 STAGE HEAT PUMP W/TEM3 MODEL AIR HANDLER
Dual Fuel Diagrams
PAG E DIAGRAM DESCRIPTION
14 18 DIAGRAM 23 1 OR 2 STAGE HEAT PUMP W/VARIABLE SPEED GAS FURNACE
18 DIAGRAM 24 1 STAGE HEAT PUMP W/NON-VARIABLE SPEED GAS FURNACE
19 DIAGRAM 25 1 OR 2 STAGE HEAT PUMP W/VARIABLE SPEED OIL FURNACE
19 DIAGRAM 26 SINGLE STAGE HEAT PUMP W/NON-VARIABLE SPEED OIL FURNACE
20 DIAGRAM 27 PACKAGE SINGLE OR MULTI-STAGE DUAL FUEL W/VARIABLE SPEED BLOWER
page 6 18-HD72D1-1
824 Programmable Comfort Control
1- 1 or 2 Stage Cooling w/TAM7 Model Variable Speed Air Handler
2- 1 Stage Cooling w/GAM5A or TAM4 Model Air Handler
4.5 Heating and Cooling Applications
Diagram 1 - 1 or 2 Stage Cooling w/TAM7 Model Variable Speed Air Handler
824 COMFORT CONTROL
AUX 2
AUX 1
24VAC HOT
COMMON
SOV
COOLING
FAN
HEATING
ODT
RS
AUX2
AUX2
AUX1
AUX1
RC
RH
B/C
O
Y1
Y2
G
BK
W1
W2
W3
ODT
ODT
RS1
RS1
NOTES:
1. C ut and remove the “BK” jumper at the indoor unit
AFC Board
INDOOR UNIT
R
OUTDOOR UNIT
R
2. “YI” and “YO” connections must be made as shown
for freeze protection and internally mounted
condensate overflow circuits to function properly
3. If a 3rd party overflow condensate switches are
B
B
O
3
YO
Y2
YI
2
YI
Y2
G
1
BK
W1
W2
W3
Optional
Outdoor
Sensor
Optional
Remote
Sensor
installed, wire between “Y1” of the 824 and “YI” of
the airflow control board
4. “R” and “Y2” connections at outdoor unit are
required only for two stage units
Diagram 2 - 1 Stage Cooling w/GAM5A or TAM4 Model Air Handler
824 COMFORT CONTROL
AUX 2
AUX2
AUX2
AUX 1
AUX1
AUX1
24VAC HOT
RC
RH
COMMON
SOV
COOLING
B/C
O
Y1
Y2
FAN
G
BK
HEATING
W1
W2
W3
ODT
ODT
ODT
RS
RS1
RS1
NOTES:
1. “YI” and “YO” connections must be made as shown
INDOOR UNIT
R
B
OUTDOOR UNIT
B
O
2
YO
YI
1
Y
Y2
G
BK
W1
W2
W3
Optional
Outdoor
Sensor
Optional
Remote
Sensor
2. If 3rd party overflow condensate switches are
for freeze protection and internally mounted
condensate overflow circuits to function properly
installed, wire between “Y1” of the 824 and “YI” of
the airflow control board
18-HD72D1-1 page 7
Installation Guide
3- 1 Stage Cooling w/GAM5B Model Air Handler
4- 2 Stage Cooling w/GAM5B Model Air Handler
Diagram 3 - 1 Stage Cooling w/GAM5B Model Variable Speed Air Handler
824 COMFORT CONTROL
AUX 2
AUX 1
24VAC HOT
COMMON
SOV
COOLING
FAN
HEATING
ODT
RS
AUX2
AUX2
AUX1
AUX1
RC
RH
B/C
O
Y1
Y2
G
BK
W1
W2
W3
ODT
ODT
RS1
RS1
INDOOR UNIT
R
B
O
1
Y
G
W1
W2
W3
OUTDOOR UNIT
B
Y
Optional
Outdoor
Sensor
Optional
Remote
Sensor
NOTES:
1. “Y” terminal must be connected at indoor unit for high
stage air flow
Diagram 4 - 2 Stage Cooling w/GAM5B Model Air Handler
824 COMFORT CONTROL
AUX 2
AUX2
AUX2
AUX 1
AUX1
AUX1
24VAC HOT
RC
RH
COMMON
SOV
COOLING
B/C
O
Y1
Y2
FAN
G
BK
HEATING
W1
W2
W3
ODT
ODT
ODT
RS
RS1
RS1
INDOOR UNIT OUTDOOR UNIT
R
B
1
Y
G
W1
W2
W3
R
B
YI
Y2
Optional
Outdoor
Sensor
Optional
Remote
Sensor
NOTES:
1. “Y” terminal must be connected at indoor unit for
high stage air flow
page 8 18-HD72D1-1
824 Programmable Comfort Control
5- 1 Stage Cooling w/GAF2-S Model Air Handler
6- 1 Stage Cooling w/GAF2-36M Model Air Handler
Diagram 5 - 1 Stage Cooling w/GAF2-S Model Air Handler
824 COMFORT CONTROL
AUX 2
AUX 1
24VAC HOT
COMMON
SOV
COOLING
FAN
HEATING
ODT
RS
AUX2
AUX2
AUX1
AUX1
RC
RH
B/C
O
Y1
Y2
G
BK
W1
W2
W3
ODT
ODT
RS1
RS1
INDOOR UNIT
R
B
G
W
OUTDOOR UNIT
B
Y
Optional
Outdoor
Sensor
Optional
Remote
Sensor
Diagram 6 - 1 Stage Cooling w/GAF2-36M Model Air Handler
824 COMFORT CONTROL
AUX 2
AUX2
AUX2
AUX 1
AUX1
AUX1
24VAC HOT
RC
RH
COMMON
SOV
COOLING
B/C
O
Y1
Y2
FAN
G
BK
HEATING
W1
W2
W3
ODT
ODT
ODT
RS
RS1
RS1
INDOOR UNIT
R
B
2
YO
YI
1
G
W
OUTDOOR UNIT
B
Y
Optional
Outdoor
Sensor
Optional
Remote
Sensor
NOTES:
1. “YI” and “YO” connections must be made as shown
for freeze protection and internally mounted
condensate overflow circuits to function properly
2. If 3rd party overflow condensate switches are
installed, wire between “Y1” of the 824 and “YI” of
the airflow control board
18-HD72D1-1 page 9
Installation Guide
7- 1 Stage w/GAT2 & GAM2 Model Air Handler
8- 1 Stage w/TEM3 Model Air Handler
Diagram 7 - 1 Stage Cooling w/GAT2 & GAM2 Model Air Handler
824 COMFORT CONTROL
AUX 2
AUX 1
24VAC HOT
COMMON
SOV
COOLING
FAN
HEATING
ODT
RS
AUX2
AUX2
AUX1
AUX1
RC
RH
B/C
O
Y1
Y2
G
BK
W1
W2
W3
ODT
ODT
RS1
RS1
INDOOR UNIT
R
B
G
W1
W2
W3
OUTDOOR UNIT
B
Y
Optional
Outdoor
Sensor
Optional
Remote
Sensor
Diagram 8 - 1 Stage Cooling w/TEM3 Model Air Handler
824 COMFORT CONTROL
AUX 2
AUX2
AUX2
AUX 1
AUX1
AUX1
24VAC HOT
RC
RH
COMMON
SOV
COOLING
B/C
O
Y1
Y2
FAN
G
BK
HEATING
W1
W2
W3
ODT
ODT
ODT
RS
RS1
RS1
INDOOR UNIT
R
B
G
W1
W2
W3
OUTDOOR UNIT
B
Y
Optional
Outdoor
Sensor
Optional
Remote
Sensor
page 10 18-HD72D1-1
824 Programmable Comfort Control
9- 1 Stage Cooling w/Non-Variable Speed Gas Furnace
10- 1 or 2 Stage Cooling w/Variable Speed Gas Furnace
Diagram 9 - 1 Stage Cooling w/Non-Variable Speed Gas Furnace
824 COMFORT CONTROL
AUX 2
AUX 1
24VAC HOT
COMMON
SOV
COOLING
FAN
HEATING
ODT
RS
AUX2
AUX2
AUX1
AUX1
INDOOR UNIT
RC
RH
B/C
O
Y1 Y
Y2
G
BK
W1
W2
W3
ODT
ODT
RS1
RS1
W1
W2
W3
R
OUTDOOR UNIT
B
B
Y
G
Optional
Outdoor
Sensor
Optional
Remote
Sensor
Diagram 10 - 1 or 2 Stage Cooling w/Variable Speed Gas Furnace
824 COMFORT CONTROL
AUX 2
AUX2
AUX2
AUX 1
AUX1
AUX1
24VAC HOT
RC
RH
COMMON
SOV
COOLING
FAN
B/C
O O
Y1
G
BK
HEATING
W1
W2
W3
ODT
ODT
ODT
RS
RS1
RS1
INDOOR UNIT OUTDOOR UNIT
R R
B
Y1/Ylo
3
B
Y
Y2Y2
3
Y/Y2
G
1
BK
W1
W2
W3
Optional
Outdoor
Sensor
Optional
Remote
Sensor
NOTES:
1. Cut and remove the factory installed “BK” jumper at
the indoor unit IFC Board
2. ”R” & “Y2” connections at outdoor are only required
for two stage units
3. ”Y1/Ylo and/or Y/Y2” must be connected at indoor
for non-Trane/American Standars units
18-HD72D1-1 page 11
Installation Guide
11- 1 Stage Cooling w/Non-Variable Speed Oil Furnace
12- 1 or 2 Stage Cooling w/Variable Speed Oil Furnace
Diagram 11 - 1 Stage Cooling w/Non-Variable Speed Oil Furnace
824 COMFORT CONTROL
AUX 2
AUX 1
24VAC HOT
COMMON
SOV
COOLING
FAN
HEATING
ODT
RS
AUX2
AUX2
AUX1
AUX1
FAN CENTER
RC
RH
B/C
O
Y1 Y
Y2
G
BK
W1
OIL BURNER
W2
W3
ODT
ODT
RS1
RS1
FURNACE
R
C
G
PRIMARY
T
T
CONDITIONER
Optional
Outdoor
Sensor
Optional
Remote
Sensor
NOTES:
1. Remove factory RC/RH jumper for systems
with seperate heating and cooling low voltage
transformers
AIR
B/C
Y
Diagram 12 - 1 or 2 Stage Cooling w/Variable Speed Oil Furnace
824 COMFORT CONTROL
AUX 2
AUX2
AUX2
AUX 1
AUX1
AUX1
24VAC HOT
RC
RH
COMMON
SOV
COOLING
FAN
B/C
O O
Y1
G
BK
HEATING
W1
W2
W3
ODT
ODT
ODT
RS
RS1
RS1
INDOOR UNIT OUTDOOR UNIT
3
R R
B
Y1/Ylo
5
Y1
Y2Y2
5
Y/Y2
G
2
BK
W1
OIL BURNER
PRIMARY
T
T
NOTES:
1. “Y2” & “R” connections at outdoor unit are only
2. Remove the factory installted jumper at “BK” on the
3. Remove factory RC/RH jumper for systems
B
4. ”BK” is not connected on non-Trane/American
5. “Y1/Ylo” and/or “Y/Y2” must be connected at the
Optional Outdoor Sensor
Optional Remote Sensor
required for 2-stage heat pumps
indoor unit
with seperate heating and cooling low voltage
transformers
Standard units
indoor unit on non-Trane/American Standard units
page 12 18-HD72D1-1
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