▲
WARNING
!
▲
WARNING
!
Relay Panel
BAY24VRPAC52DC
18-HD68D1-10
Installation Guide
Other Installation Guides may be necessary, based on system configuration.
1 Control (required) *ZONE950, *ZON1050 or *CONT850
A list of other system components is shown below.
Relay Panel
2
For use with Communicating Controls and 24V
or Hybrid Systems
Zone Panel (optional)
3
Zone Sensor with Display (optional)
4
Zone Sensor (optional)
5
Zone Dampers (optional)
6
* A or T
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.
Section 1. Safety
Table of Contents
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.
Section 1. Safety ..............................................1
Section 2. General Information ................2
Section 3. Installation ....................................3
Section 4. Terminal Locations and ID ...6
Section 5. Field Wiring Diagrams ............8
Section 6. LED Indicators ...........................25
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.
Section 7. Troubleshooting ........................25
11/17
Installation Guide
Section 2. General Information
2.1 Overview
The Relay Panel is a wall mounted low voltage
panel that enables communicating controls to
operate with 24 VAC HVAC equipment. Only three
wires are required from the control to the Relay
Panel.
This Relay Panel controls the operation of heating,
cooling, heat pump and dual fuel systems.
For specific wiring applications, see Field Wiring
Diagrams.
*A or T
2.2 Contents in Box
The following parts are included in product model
BAY24VRPAC52DC:
1 - Relay Panel cover
1 - Relay Panel base
4 - Mounting screws/anchors
4 - Wire ties
1 - Installation Guide
2.3 Optional Accessories
Sensor Description
ZZSENSAL0400AA Indoor Temperature Sensor
BAYSEN01ATEMPA Outdoor Temperature Sensor
Relay Panel
Relay Panel
NORM
DUAL
Dual Fue
Switch
l
0 SO
V
Y1 Stg1
D
Y2 Stg2
R
B
Data
Hot
Thermosta
Com
and Indoor Unit
W1 Stg1
t
W2 Stg2
W3 Stg3
G
AC System
Fan
BK
RS
HV
PWM
Remote
Hum
Indoor
RS
ac
Hum
Comm
24 V
Sensors
Aux1
Only
ac
Aux1
ODT
Bit Master
24 V
Aux2
ODT
Only
Outdoor
ac
Aux2
24 V
Only
Relay Panel
2.4 Specifications
Specification Description
Product Model: BAY24VRPAC52DC
Product: Relay Panel for use with 24V indoor systems
Size: 8.0” width x 9.3” height x 1.9” depth
Storage Temperature: -40° to 175°F, 5% - 95% RH non-condensing
Operating Temperature: -40° to 150°F, 5% - 95% RH non-condensing
Input Power: 24 VAC from HVAC System (Range: 18-32 VAC)
Power Consumption: 4VA* (See the following table for system transformer sizing guidelines.)
Wire usage: Minimum 18 gauge NEC approved control wiring
HVAC System Type Compatible: Standard (gas/electric), Heat Pump, Dual Fuel
Multistage System Compatible: Standard HVAC Systems: 3-stage heating, 2-stage cooling
Heat Pump Systems: 5-stage heating (2-compressor, 3 aux heat), 2-stage cooling
LEDs: 11 green, 1 amber
Communications: 12 VDC
AUX Contacts: Dry contacts, 18–30 VAC, 2A max
2 18-HD68D1-10
RELAY PANEL
2.5 System Transformer Sizing Guidelines
Indoor Unit Type
Comm
Furnace
OD Unit Type
Communicating Heat Pump 35 35
Communicating Air Conditioner 35 35
24Volt-Controlled Single Stage Heat Pump 35 40 35 40
24Volt-Controlled Single Stage Air Conditioner 35 40 35 40
24Volt-Controlled 2-Stage Single Compressor Heat Pump 65 75 65 75
24Volt-Controlled 2-Stage Single Compressor Air Conditioner 50 40 50 40
24Volt-Controlled 2-Stage Dual Compressor Heat Pump 50 75 50 75
24Volt-Controlled 2-Stage Dual Compressor Air Conditioner 35 40 35 40
*Note: The VA rating of all 24V field-installed accessories must be added to the above for sizing indoor unit control transformers or the accessories
must be powered separately.
Comm
Air Handler
24V
Furnace
Minimum Indoor 24V Control Power
Transformer Size, VA*
See Below
24V
Air Handler
Section 3. Installation
Unit Location Considerations
The unit’s rugged design allows installation in closet, attic or other non-condensing locations free from obstructions or other hazards.
Remove Cover
1
Remove cover by grasping at edges and gently
pulling the cover straight towards you. It should
release without much effort.
Mark Mounting Location
2
Mark four holes on the wall using the base as a
template. A level may be used to ensure accuracy.
Relay Pane
l
N
OR
M
DUA
L
Dual Fuel
Switch
0 SOV
Data
Y1 Stg1
Y2 Stg2
and Indoor Unit
W1 Stg1
W2 Stg2
W3 Stg3
AC System
HV
G
Fan
BK
PWM
Hum
ac
Hum
24 V
Only
Aux1
ac
Aux1
24 V
Only
Aux2
ac
Aux2
24 V
Only
Relay Panel
D
Thermostat
NORM
DUAL
Dual Fue
Switch
l
0 SO
V
Y1 Stg1
D
Y2 Stg2
R
B
Data
Hot
Thermostat
Com
and Indoor Unit
W1 Stg1
W2 Stg2
W3 Stg3
G
AC System
Fan
BK
RS
HV
PWM
Remote
Hum
Indoor
RS
ac
Hum
Comm
24 V
Sensors
Aux1
Only
ac
Aux1
ODT
Bitmaster
24 V
Aux2
ODT
Only
Outdoor
ac
Aux2
24 V
Only
Relay Pane
l
R
B
Hot
Com
RS
RS
Indoor
Remote
Sensors
ODT
ODT
Comm
Outdoor
Bit Master
18-HD68D1-10 3
Installation Guide
▲
CAUTION
!
▲
WARNING
!
c
Hum
Mount Panel
3
DRILL HOLES
1/8” for screws
into studs
3/16” for drywall
anchors
Mounting to studs: Drill 1/8” pilot holes in the four
locations marked above.
Mounting to drywall:
If mounting to drywall with no studs behind it, enlarge pilot holes to 3/16” for anchors (included with
the relay panel).
Gently tap anchors into the holes.
a
Hum
24 V
Aux1
ac
Aux1
24 V
Aux2
ac
Aux2
24 V
Only
Only
Only
Relay Panel
Bitmaster
Attach base to wall using four screws provided. Do
not overtighten.
General Wiring Information
4
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.
Wires may enter the Relay Panel through openings
on each corner and at the center of each side.
Necessary wire lengths should be considered when
determining entry points.
CAUTION: EQUIPMENT DAMAGE HAZARD - Improper
wiring can lead to equipment damage. Follow the terminal
connection information carefully to ensure the control is
wired properly. After wires are secure, bare wires
MUST NOT touch each other. See the Field Wiring Diagrams for specific system applications.
Wires may
enter at
any of 8
locations
Relay Panel
4 18-HD68D1-10
Bit
Co
o
s
o
B
M
Data
Hot
Com
DR
B
Dual Fuel
Switch
DUAL
Routing Wires
5
Run wires within the recessed wire “raceway”. Be
sure there is ample length to reach the connectors.
Attaching Wires
6
Using 1/8” blade screwdriver, attach all wires securely to the proper terminals on the Relay Panel.
Refer to the following section for detailed terminal
information.
(See the Field Wiring Diagrams section for common system configurations.)
RELAY PANEL
Route wires into “Raceways”
Data
0 SOV
Y1 Stg1
Y2 Stg2
Therm
and Indo
R
D
Hot
Securing Wires
7
Secure all wires with the supplied wire ties to ensure that wires are kept in place and not strained.
W1 Stg1
W2 Stg2
W3 Stg3
Fan
G
Secure wires with Wire Ties
AC System
HV
18-HD68D1-10 5
Installation Guide
Section 4. Terminal Locations and ID
Refer to the following diagrams for descriptions
of each terminal.
KEY
A
B
C
D
Terminal
Identification
Dual Fuel Switch
Thermostat +
24VAC Input
Optional Sensors
HVAC System
D
A
NORM
Dual Fuel
Switch
0 SOV
Y1 Stg1
Y2 Stg2
W1 Stg1
W2 Stg2
W3 Stg3
G
PWM
BK
Hum
Hum
Aux1
Aux1
Aux2
Aux2
Fan
DUAL
24 Vac
Only
24 Vac
Only
24 Vac
Only
Relay Panel
D R
Data
Hot
Thermostat
and Indoor Unit
HVAC System
Comm
Bit Master
B
B
Com
RS
RS
Indoor
Remote
Sensors
Outdoor
ODT
ODT
C
A
Dual Fuel Switch
Switch Position Description
A
NORM
NORM
DUAL
For HP or conventional
Heat/Cool systems.
DUAL For dual fuel systems.
Dual Fuel
Switch
This switch ships in the NORM position by
default. Refer to the following section for complete Field Wiring Diagrams.
6 18-HD68D1-10
DUAL
Thermosta
and Indoor Unit
Switch
V
1
2
l
Data
Thermostat
and Indoor Unit
Indoor
Remote
Sensors
ODT
ODT
Outdoor
D R
RS
RS
Hot
RELAY PANEL
For convenience, you may record the color of each wire
used in the blanks provided.
B
Thermostat and Indoor Unit Connections
Terminal Name Description Color Used:
D - Data Data
B
B
Com
C
R - Hot 24 V hot
B - Com 24 V common
Note: R & B must receive 24 volts from the indoor unit transformer.
C
Optional Remote Sensor Connections
Terminal Name Description Color Used:
RS
Indoor
Remote
RS
ODT
Outdoor
ODT
Note: The Relay Panel uses 5 VDC to obtain temperature feedback from
remote sensors. Do not run these sensors in a wiring bundle that contains
24 volts AC. See remote sensor literature for troubleshooting.
1 Wired outdoor temperature sensor must be enabled at the Control.
Remote Indoor
temp sensor
ZZSENSAL0400AA
1 Outdoor temp sensor
BAYSEN01ATEMPA
D
0 SOV
Y1 Stg1
Y2 Stg2
W1 Stg1
W2 Stg2
W3 Stg3
Fan
G
PWM
BK
Hum
Hum
Aux1
Aux1
Aux2
Aux2
24 Vac
Only
24 Vac
Only
24 Vac
Only
LEDs
D
Data
HVAC System
D
HVAC System Connections
Terminal Name Description Color Used:
O - SOV Switch Over Valve
Y1 - Stg1 First Stage Compressor
Y2 - Stg2
Second Stage
Compressor
W1 - Stg1 First Stage ID Heating
W2 - Stg2 Second Stage ID Heating
W3 - Stg3 Third Stage ID Heating
G - Fan Indoor Blower
BK - PWM
PWM Signal for indoor
blower modulation
Hum* Humidifier Contact
Hum* Humidifier Contact
Aux 1* Dehumidifier/Ventilation ---
Aux 1* Dehumidifier/Ventilation ---
Aux 2* Dehumidifier/Ventilation ---
Aux 2* Dehumidifier/Ventilation ---
*Note:
Hum & Aux terminals are dry contacts only. Input voltage will need to be
supplied. Refer to humidifier’s installer’s guide. If the output of these contacts is
being used as an input to a non electro-mechanical device, a field-supplied 10K
Ohm resistor should be placed between the top terminal of each pair of contacts
and the Common (B) terminal of the Relay Panel.
18-HD68D1-10 7
Installation Guide
Section 5. Field Wiring Diagrams
AC Applications
Diagram 1 - 1 or 2 Stage Cooling w/TAM7 or TAM9 in 24 volt mode Model Air Handler
OUTDOOR UNIT
4
R
B
Y/Y1
Y2
INDOOR UNIT
R
D
B
O
YI
2
YO
Y2
W1
W2
W3
G
1
BK
RELAY PANEL
D R B
O
3
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
COMMUNICATING
CONTROL
D
R
B
NOTES:
1. C ut and remove the BK jumper at the indoor unit
AFC Board
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
installed, wire between Y1 of the Relay Panel and
YI of the airflow control board
4. R connection at outdoor unit is required only for two
compressor / two stage units
5. D terminal is on TAM9 ONLY.
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Diagram 2 - 1 or 2 Stage Cooling w/TAM9 in communication mode Air Handler
OUTDOOR UNIT
1
R
B
Y/Y1
Y2
INDOOR UNIT
R
D
B
RELAY PANEL
D R B
O
Y1
Y2
W1
W2
W3
G
BK
ONLY
HUM*
HUM*
ONLY
AUX1*
AUX1*
ONLY
AUX2*
AUX2*
24V
24V
24V
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
HUM
HUM
AUX1
AUX1
AUX2
AUX2
COMMUNICATING
CONTROL
D
R
B
NOTES:
1. R connection at outdoor unit is required only for two
compressor / two stage units
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
8 18-HD68D1-10
Diagram 3 - 1 Stage Cooling w/GAM5A or TAM4 Model Air Handler
RELAY PANEL
OUTDOOR UNIT
B
Y
INDOOR UNIT
R
B
O
YI
1
YO
W1
W2
W3
G
RELAY PANEL
D R B
O
2
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
COMMUNICATING
CONTROL
D
R
SOV
STG1
STG2
NOTES:
B
1. YI and YO connections must be made as shown for
freeze protection and internally mounted condensate
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
overflow circuits to function properly
2. If 3rd party overflow condensate switches are
installed, wire between Y1 of the Relay Panel and
YI of the air handler
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Diagram 4 - 1 Stage Cooling w/GAM5B Model Air Handler
OUTDOOR UNIT
B
Y
INDOOR UNIT
R
B
O
1
Y
W1
W2
W3
G
RELAY PANEL
D R B
O
Y1
Y2
W1
W2
W3
G
BK
ONLY
HUM*
HUM*
ONLY
AUX1*
AUX1*
ONLY
AUX2*
AUX2*
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
HUM
24V
HUM
AUX1
24V
AUX1
24V
AUX2
AUX2
1. Y terminal must be connected at indoor unit for
COMMUNICATING
CONTROL
NOTES:
selected compressor air flow
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
D
R
B
18-HD68D1-10 9
Installation Guide
Diagram 5 - 2 Stage Cooling w/GAM5B Model Air Handler
OUTDOOR UNIT
B
Y1
Y2
RELAY PANEL
D R B
COMMUNICATING
CONTROL
D
INDOOR UNIT
2
RR
O
Y1
B
Y2
SOV
STG1
STG2
R
B
NOTES:
1. Y terminal must be connected at indoor unit for
selected compressor air flow
2. R connection at outdoor unit is required only for two
compressor / two stage units
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
W1
W2
W3
W1
1
Y
W2
W3
G
BK
G
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
Diagram 6 - 1 Stage Cooling w/GAF2-S Model Air Handler
RELAY PANEL
COMMUNICATING
CONTROL
OUTDOOR UNIT
B
Y
INDOOR UNIT
R
B
W
G
D R B
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
D
R
B
10 18-HD68D1-10
Diagram 7 - 1 Stage Cooling w/GAF2-36M Model Air Handler
RELAY PANEL
OUTDOOR UNIT
B
Y
INDOOR UNIT
3
R
B
O
YI
1
YO
W
G
RELAY PANEL
D R B
O
2
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
COMMUNICATING
CONTROL
D
R
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
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 Relay Panel and
YI of the air handler
3. Jumper R and O must be installed for blower to run
at cooling airflow
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
B
Diagram 8 - 1 Stage Cooling w/GAT2 & GAM2 Model Air Handler
OUTDOOR UNIT
B
Y
INDOOR UNIT
R
B
W1
W2
W3
G
RELAY PANEL
D R B
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
COMMUNICATING
CONTROL
D
R
B
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
18-HD68D1-10 11
Installation Guide
Diagram 9 - 1 Stage Cooling w/TEM3 & TEM4 Air Handler
OUTDOOR UNIT
B
Y
INDOOR UNIT
R
B
W1
W2
G
RELAY PANEL
D R B
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
COMMUNICATING
CONTROL
D
R
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
B
Diagram 10 - 1 or 2 Stage Cooling w/TEM6 or TEM8 Model Air Handler 24 volt mode
OUTDOOR UNIT
2
R
B
Y1
Y2
INDOOR UNIT
R
D
B
Y1
Y2
W1
W2
W3
G
1
BK
RELAY PANEL
D R B
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
COMMUNICATING
CONTROL
D
R
B
NOTES:
1. Cut and remove the BK jumper at the indoor unit
2. R connection at outdoor unit is required only for two
compressor / two stage units
3. D Terminal is on TEM8 ONLY
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
12 18-HD68D1-10
Diagram 11 - 1 or 2 Stage Cooling w/TEM8 Air Handler communicating mode
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
SOV
STG2
STG1
STG1
STG3
STG2
FAN
PWM
HUM
HUM
AUX1
AUX1
AUX2
AUX2
24V
ONLY
24V
ONLY
24V
ONLY
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
RELAY PANEL
R
B
INDOOR UNIT
R
B
Y1
Y2
OUTDOOR UNIT
COMMUNICATING
CONTROL
D R B
D
R
B
D
1) R connection at outdoor unit only required
for two compressor/two stage units.
1
RELAY PANEL
Diagram 12 - 1 Stage Cooling w/Gas Furnace
RELAY PANEL
D R B
OUTDOOR UNIT
INDOOR UNIT
R
B
B/C
Y
Y
W1
W2
G
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
18-HD68D1-10 13
COMMUNICATING
CONTROL
D
R
B
Installation Guide
RELAY PANEL
Diagram 13 - 1 or 2 Stage Cooling w/Variable Speed Gas Furnace (16-pin VSPD Motor)
OUTDOOR UNIT
2
R
B
Y/Y1
Y2
INDOOR UNIT
R
B/C
O
Y1/Ylo
Y/Y2
W1
W2
G
1
BK
D R B
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
COMMUNICATING
CONTROL
D
R
SOV
STG1
STG2
NOTES:
1. Cut and remove the factory installed BK jumper at
B
the indoor unit IFC Board (some units may require
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
DIP switch settings)
2. R connection at outdoor unit is required only for two
compressor / two stage units
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Diagram 14 - 1 or 2 Stage Cooling w/Variable Speed S9V2 (4-pin VSPD Motor)
Y/Y1
Y2
RELAY PANEL
D R B
INDOOR UNIT
2
R
B
R
B/C
O
Y1
Y2
SOV
3
STG1
STG2
O
Y1/Ylo
Y/Y2
W1
W2
W3
STG1
STG2
STG3
W1
W2
BK
G
BK
G
1
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
COMMUNICATING
CONTROL
D
R
B
NOTES:
1. Cut the factory installed BK jumper at the indoor unit
IFC Board
2. R connection at outdoor unit is required only for two
compressor / two stage units
3. Y1 and Y2 wiring from the Relay Panel must connect
to Y1 and Y2 of the indoor unit IFC for proper air flow
and LED read out
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
14 18-HD68D1-10
Diagram 15 - Communicating VS Cooling w/Non-Communicating S9V2 Furnace
(4-pin VSPD Motor)
RELAY PANEL
D R B
COMMUNICATING
CONTROL
2
RELAY PANEL
OUTDOOR UNIT
D
R
B
INDOOR UNIT
R
B/C
O
Y1/Ylo
Y/Y2
W1
W2
G
1
BK
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
R
B
SOV
STG1
STG2
STG1
STG2
STG3
NOTES:
1. C ut the BK jumper at the indoor unit - After cutting the
jumper, power must be off or cycled on-off-on for the
IFC to work properly
2. Requires either:
a.) 1050 control
b.) 850 control with 3.0 or later software
Note: Not a valid combination with 950 control
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
CFM/Ton must be set to 400
Furnace LED’s will read “CoF” continous fan during
cooling operation
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Diagram 16 - Package 1 or 2 Stage Heat/Cool w/Variable Speed Blower
D
PACKAGE UNIT
R
B
Y/Y1
Y2
W1
W2/X2
G
BK
RELAY PANEL
D R B
O
Y1
Y2
W1
W2
W3
G
1
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
COMMUNICATING
CONTROL
D
R
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
NOTES:
1. Remove “R” to “BK” jumper and clip all “Y”
connections at the integrated motor control board
(ICMC) to enable pulse width control of the variable
speed indoor blower. Ensure clipped wires are
capped and taped off.
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
B
18-HD68D1-10 15
Installation Guide
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
SOV
STG2
STG1
STG1
STG3
STG2
FAN
PWM
HUM
HUM
AUX1
AUX1
AUX2
AUX2
24V
ONLY
24V
ONLY
24V
ONLY
O
Y1
Y2
W1
W2
W3
W1
W2
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
RELAY PANEL
R
C
G
INDOOR UNIT
C
Y
OUTDOOR UNIT
COMMUNICATING
CONTROL
D R B
D
R
B
Diagram 17 - Package 1 Stage Heat/Cool w/Non-Variable Speed Blower
PACKAGE UNIT
R
B
Y
W1
W2
G
RELAY PANEL
D R B
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
COMMUNICATING
CONTROL
D
R
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
B
Diagram 18 - Ameristar 1 Stage Cooling
16 18-HD68D1-10
NOTES:
1. Remove the factory installed BK jumper at the
indoorunit’s AFC board
2. YI and YO connections must be made as shown
for freeze protection and internally mounted
condensate overflow circuits to function properly
3. Wire 3rd party condensate overflow switches
between Y1 of the Relay Panel and Y of the air
board
4. Connection to X2 is not required for this
configuration
4
3
SOV
STG2
STG1
STG1
STG3
STG2
FAN
PWM
HUM
HUM
AUX1
AUX1
AUX2
AUX2
24V
ONLY
24V
ONLY
24V
ONLY
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
RELAY PANEL
R
B
INDOOR UNIT
R
X2
B
O
Y1
OUTDOOR UNIT
COMMUNICATING
CONTROL
D R B
D
R
B
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Y2
D
Heat Pump Applications
RELAY PANEL
Heat Pump Applications
Diagram 1 - 1 or 2 Stage Heat Pump w/TAM7 or TAM9 in 24 volt mode Model Air Handler
RELAY PANEL
D R B
COMMUNICATING
CONTROL
OUTDOOR UNIT
R
4
X2
B
O
Y1
Y2
INDOOR UNIT
R
D
B
O
2
YI
2
YO
Y2
W1
W2
W3
G
1
BK
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
SOV
STG1
3
STG2
NOTES:
STG1
STG2
STG3
1. Remove the factory installed BK jumper at the
indoor unit’s AFC Board
2. YI and YO connections must be made as shown
for freeze protection and internally mounted
condensate overflow circuits to function properly
3. Wire 3rd party condensate overflow switches
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
between Y1 of the Relay Panel and YI of the airflow
control board
4. Connection to X2 is not required for this
configuration
5. D Terminal is on TAM9 ONLY
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
D
R
B
Diagram 2 - 1 or 2 Stage Heat Pump w/TAM9 in communication mode Air Handler
18-HD68D1-10 17
Installation Guide
RELAY PANEL
Diagram 3 - 1 Stage Heat Pump w/GAM5 or TAM4 Model Air Handler
OUTDOOR UNIT
R
3
X2
B
O
Y
INDOOR UNIT
R
B
O
1
YI
1
YO
W
G
D R B
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
COMMUNICATING
CONTROL
D
R
SOV
STG1
2
STG2
B
NOTES:
STG1
STG2
STG3
1. YI and YO connections must be made as shown
for freeze protection and internally mounted
condensate overflow circuits to function properly
2. Wire 3rd party condensate overflow switches
beteeen Y1 of the Relay Panel and YI of the air
handler
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
3. Connection to X2 is not required for this
configuration
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Diagram 4 - 1 Stage Heat Pump w/GAM5B Model Air Handler
RELAY PANEL
COMMUNICATING
CONTROL
selected compressor air flow
configuration
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
OUTDOOR UNIT
R
2
X2
B
O
Y
INDOOR UNIT
R
B
1
Y
W1
W2
W3
G
D R B
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
SOV
STG1
STG2
NOTES:
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
1. Y terminal must be connected at indoor unit for
2. Connection to X2 is not required for this
D
R
B
18 18-HD68D1-10
NOTES:
1. Y terminal must be connected at indoor unit for
selected compressor air flow
2. Connection to X2 is not required for this
configuration
2
1
SOV
STG2
STG1
STG1
STG3
STG2
FAN
PWM
HUM
HUM
AUX1
AUX1
AUX2
AUX2
24V
ONLY
24V
ONLY
24V
ONLY
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
RELAY PANEL
R
B
Y
W1
W2
W3
G
INDOOR UNIT
R
X2
B
O
Y2
Y1
OUTDOOR UNIT
COMMUNICATING
CONTROL
D R B
D
R
B
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Diagram 5 - 2 Stage Heat Pump w/GAM5B Model Air Handler
RELAY PANEL
Diagram 6 - 1 Stage Heat Pump w/GAF2-S Model Air Handler
RELAY PANEL
D R B
R
B
W
G
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
NOTES:
1. Connection to X2 is not required for this
OUTDOOR UNIT
R
1
X2
B
O
Y
INDOOR UNIT
18-HD68D1-10 19
COMMUNICATING
CONTROL
D
R
B
configuration
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Installation Guide
Diagram 7 - 1 Stage Heat Pump w/GAF2-36M Air Handler
RELAY PANEL
D R B
COMMUNICATING
CONTROL
OUTDOOR UNIT
R
3
X2
B
O
Y
INDOOR UNIT
R
B
O
1
YI
1
YO
W
G
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
D
R
SOV
STG1
2
STG2
B
NOTES:
STG1
STG2
STG3
1. YI and YO connections must be made as shown
for freeze protection and internally mounted
condensate overflow circuits to function properly
2. Wire 3rd party condensate overflow switches
beteeen Y1 of the Relay Panel and YI of the air
handler
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
3. Connection to X2 is not required for this
configuration
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Diagram 8 - 1 Stage Heat Pump w/GAT2 & GAM2 Model Air Handler
RELAY PANEL
COMMUNICATING
CONTROL
D
R
B
NOTES:
1. Connection to X2 is not required for this
configuration
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
OUTDOOR UNIT
R
1
X2
B
O
Y
INDOOR UNIT
R
B
W1
W2
W3
G
D R B
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
20 18-HD68D1-10
Diagram 9 - 1 Stage Heat Pump w/TEM3 Model Air Handler
RELAY PANEL
D R B
COMMUNICATING
CONTROL
RELAY PANEL
OUTDOOR UNIT
R
1
X2
B
O
Y
INDOOR UNIT
R
B
Y1
Y2
W1
W2
W3
O
SOV
STG1
STG2
NOTES:
1. Connection to X2 is not required for this
STG1
STG2
STG3
W1
W2
G
BK
G
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Diagram 10 - 1 Stage Heat Pump w/TEM4 Air Handler
D
R
B
configuration
OUTDOOR UNIT
R
1
X2
B
O
Y
INDOOR UNIT
R
B
W1
W2
W3
G
RELAY PANEL
D R B
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
COMMUNICATING
CONTROL
D
R
SOV
STG1
STG2
NOTES:
B
1. Connection to X2 is not required for this
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
configuration
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
18-HD68D1-10 21
Installation Guide
10- 1 OR 2 STAGE HEAT PUMP 24 volt w/TEM8 communicating variable speed AIR HANDLER
NOTES:
1. Remove the factory installed BK jumper at the
indoor unit
2. Connection to X2 is not required for this
configuration
2
SOV
STG2
STG1
STG1
STG3
STG2
FAN
PWM
HUM
HUM
AUX1
AUX1
AUX2
AUX2
24V
ONLY
24V
ONLY
24V
ONLY
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
RELAY PANEL
R
B
INDOOR UNIT
R
X2
B
O
Y2
Y1
OUTDOOR UNIT
COMMUNICATING
CONTROL
D R B
D
R
B
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
D
Diagram 11 - 1 or 2 Stage Heat Pump w/TEM6 or TEM8 Variable Speed Air Handler 24 volt
OUTDOOR UNIT
R
2
X2
B
O
Y1
Y2
INDOOR UNIT
R
D
B
O
Y1
Y2
W1
W2
G
1
BK
RELAY PANEL
D R B
O
Y1
Y2
W1
W2
W3
G
BK
ONLY
HUM*
HUM*
ONLY
AUX1*
AUX1*
ONLY
AUX2*
AUX2*
24V
24V
24V
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
HUM
HUM
AUX1
AUX1
AUX2
AUX2
COMMUNICATING
CONTROL
D
R
B
NOTES:
1. Remove the factory installed BK jumper at the
indoor unit
2. Connection to X2 is not required for this
configuration
3. D Terminal is on TEM8 ONLY.
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Diagram 12 - 1 or 2 Stage Heat Pump 24 volt w/TEM8 Communicating Variable Speed Air
Handler
22 18-HD68D1-10
11 - Package 1 or 2 Stage Heat Pump w/Variable Speed Blower
NOTES:
1. Remove “R” to “BK” jumper and clip all “Y”
connections at the integrated motor control board
(ICMC) to enable pulse width control of the variable
speed indoor blower. Ensure clipped wires are
capped and taped off.
1
SOV
STG2
STG1
STG1
STG3
STG2
FAN
PWM
HUM
HUM
AUX1
AUX1
AUX2
AUX2
24V
ONLY
24V
ONLY
24V
ONLY
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
RELAY PANEL
R
B
O
Y2
Y/Y1
W1
W2/X2
G
PACKAGE UNIT
BK
COMMUNICATING
CONTROL
D R B
D
R
B
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Diagram 13 - Package 1 or 2 Stage Heat Pump w/Variable Speed Blower
12- Package 1 Stage Heat Pump w/Non-Variable Speed Blower
RELAY PANEL
Diagram 14 - Package 1 Stage Heat Pump w/Non-Variable Speed Blower
D R B
PACKAGE UNIT
R
B
O
Y1
W1
W2/X2
G
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
ONLY
24V
ONLY
24V
ONLY
24V
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
HUM
HUM
AUX1
AUX1
AUX2
AUX2
18-HD68D1-10 23
COMMUNICATING
CONTROL
D
R
B
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
Installation Guide
1 - 1 OR 2 STAGE HEAT PUMP W/VARIABLE SPEED GAS FURNACE (16-PIN VSPD MOTOR)
Dual Fuel Applications
AC Applications
Diagram 1 - 1 or 2 Stage Heat Pump w/Variable Speed Gas Furnace (16-pin VSPD Motor)
OUTDOOR UNIT
B
O O
Y/Y1
Y2
X2
INDOOR
UNIT
RR
B
Y1/Ylo
Y/Y2
W1
W2
G
BK
RELAY PANEL
D R B
O
Y1
Y2
W1
W2
W3
G
1
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
NOTES:
1. Cut and remove the factory installed BK jumper at
the indoor unit (some units may require DIP switch
settings)
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
COMMUNICATING
CONTROL
D
R
B
Diagram 2 - 1 or 2 Stage Heat Pump w/Variable Speed S9V2 Furnace (4-pin VSPD Motor)
D R B
OUTDOOR UNIT
B
O O
X2
Y/Y1
Y2
INDOOR
UNIT
RR
B
Y1/Ylo
Y/Y2
W1
W2
G
BK
O
Y1
Y2
W1
W2
W3
SOV
STG1
3
STG2
STG1
STG2
STG3
NOTES:
1. Cut and remove the factory installed BK jumper at
the indoor unit (some units may require DIP switch
settings)
2. Y1 and Y2 wiring from the Relay Panel must connect
G
1
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
to Y1 and Y2 of the indoor unit IFC for proper air flow
and LED read out
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
COMMUNICATING
CONTROL
D
R
B
24 18-HD68D1-10
Diagram 3 - 1 Communicating VS Heat Pump w/Non-Communicating S9V2 Furnace
1
2
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
NOTES:
1. C ut the BK jumper at the indoor unit - After cutting the
jumper, power must be off or cycled on-off-on for the
IFC to work properly
2. Requires either:
a.) 1050 control
b.) 850 control with 3.0 or later software
Note: Not a valid combination with 950 control
CFM/Ton must be set to 400
Furnace LED’s will read “CoF” continous fan during
cooling operation
SOV
STG2
STG1
STG1
STG3
STG2
FAN
PWM
HUM
HUM
AUX1
AUX1
AUX2
AUX2
24V
ONLY
24V
ONLY
24V
ONLY
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
RELAY PANEL
R
O
B/C
Y1/Ylo
BK
Y/Y2
W1
W2
G
INDOOR UNIT
D
R
B
OUTDOOR UNIT
COMMUNICATING
CONTROL
D R B
D
R
B
RELAY PANEL
Diagram 4 - 1 Stage Heat Pump w/Non-Variable Speed Gas Furnace
RELAY PANEL
COMMUNICATING
CONTROL
D
R
B
D R B
OUTDOOR UNIT
X2
INDOOR
UNIT
RR
B
O
Y
B
Y
W1
W2
G
O
Y1
Y2
W1
W2
W3
G
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
SOV
STG1
STG2
STG1
STG2
STG3
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
18-HD68D1-10 25
Installation Guide
Diagram 5 - Package 1 or 2 Stage Dual Fuel w/Variable Speed Blower
RELAY PANEL
D R B
COMMUNICATING
CONTROL
OUTDOOR
UNIT
R
B
O
Y/Y1
Y2
W1
W2/X2
G
BK
D
R
O
Y1
Y2
W1
W2
W3
SOV
STG1
STG2
STG1
STG2
STG3
B
NOTES:
1. Remove “R” to “BK” jumper and clip all “Y”
connections at the integrated motor control board
(ICMC) to enable pulse width control of the variable
speed indoor blower. Ensure clipped wires are
capped and taped off.
G
1
BK
HUM*
HUM*
AUX1*
AUX1*
AUX2*
AUX2*
FAN
PWM
ONLY
HUM
24V
HUM
ONLY
AUX1
24V
AUX1
ONLY
24V
AUX2
AUX2
*See note on page 7 regarding HUM and AUX
terminals.
Caution: Do not run Outdoor/Remote sensor wires in
the same bundle with HVAC wires. Also, keep away
from high voltage wiring to avoid interference.
26 18-HD68D1-10
Section 6. LED Indicators
D R
B
Comm
Communication LED – Amber
• LED on when first powering up
• LED flashes number of communicating components in the system.
• (ex. communicating control with relay panel
will equal two flashes)
Bit Master
Bitmaster/Clock Signal LED – Green
• LED on when Clock is working
HVAC System
HVAC System LEDs – Green
• A Green LED will illuminate when the relay is
energized.
0 SOV
Y1 Stg1
Y2 Stg2
W1 Stg1
W2 Stg2
W3 Stg3
Fan
G
PWM
BK
Hum
Hum
Aux1
Aux1
Aux2
Aux2
24 Vac
24 Vac
24 Vac
Only
Only
Only
Data
Hot
Thermostat
and Indoor Unit
HVAC System
Comm
Bit Master
RELAY PANEL
Com
Sensors
Section 7. Troubleshooting
Troubleshooting
Symptom Possible Cause Action
Loss of 24VAC between power (R) and common (B) Check for proper incoming 24VAC power
COMM LED is not
flashing the appropriate number
of devices
Bit Master LED is
off or fluttering
HVAC System
LED is not illuminating when Relay
Panel is calling for
a particular relay
One or more communicating devices is not communicating
• ~12VDC between D & B = Proper communication
• ~16VDC between D & B = Loss of communication
• Less than ~12VDC between D & B = shorted or no power
Loss of 24VAC between power (R) and common (B) Check for proper incoming 24VAC power
Loss of communication
• 0VDC between D & B (shorted or no power)
• Less than ~12VDC between D & B (low level shor t)
Control is not calling
Relay Panel failed
Check for open or shorts in field wiring
Evaluate other communicating devices and use
the service facts of that device if not communicating properly
Check for shorted wire between data (D) and
common (B) wires
Check the System Report screen at the control
to verify demand
Verify 24VAC between relay output terminal and
common (B)
**Relay output contains snubber circuits; always
check with a load applied
18-HD68D1-10 27
Installation Guide
6200 Troup Highway
Tyler, TX 75707
© 2016 Trane
The manufacturer has a policy of continuous product and product data improvement
and it reserves the right to change design and specifications without notice.
Representative-only illustrations included in this document.
28 18-HD68D1-10
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