Honeywell THP9045 Installation Instructions Manual
THP9045 Wiring Module
INSTALLATION INSTRUCTIONS
WIRESAVER
THERMOSTAT
FEATURES
• Can be used when a common wire is required.
• Mounts easily on or near HVAC equipment.
W-O/B
Rc
KC
Honeywell
Rc
THP9045A
YG C
EQUIPMENT
W-O/B
M31301A
APPLICATION
The THP9045 Wiring Module is designed to be used with
applicable thermostats in which a 24V common is
required and there are not enough wires. The K terminal
on the thermostat can be used to operate both the fan
and compressor on a single wire, and the module is
designed to receive the signal from the K terminal, split
that signal and re-route it to operate the compressor,
and/or fan for normal operation.
Use with the following thermostats:
— THX9321R
— THX9321R5000
— THX9321R1008
— TH8320UP1003
— T5060F7088
INSTALLATION
1. The THP9045 Wiring Module can be equipment- or
wall-mounted in any orientation or as dictated by
the surroundings.
2. Precise leveling of the THP9045 module is not
required.
3. Identify the four wires in the wall and connect to the
R, C, W, and K terminals on the thermostat.
4. Wire the K terminal on the thermostat to the K ter-
minal on the THP9045 module.
5. Wire the R and C terminals on the thermostat to
the R (power) and C (common) terminals on the
THP9045 module and equipment.
6. Wire the W terminal from the thermostat to the W
(heat relay) terminal on the HVAC equipment.
7. Wire the Y and G terminals on the Module to the Y
(Compressor Relay) and G (Fan Relay) terminals
on the HVAC equipment.
TERMINALS
R24V
C 24V Common
Y Cooling relay
GFan relay
K Communication
Place Bar Code Here
69-2065EFS-07
THP9045 WIRING MODULE
THX9321R SUBBASE
CONVENTIONAL
O/B
W
AUX/E W2
YY
Y2 Y2
GG
NOT
L
USED
K
K
NOT
USED
NOT
USED
NOT
USED
C
Rc
R
U1 U1
U1 U1
U2 U2
U2 U2
NOT
USED
C
Rc
R
HEAT PUMP
Fig. 1. Example wiring diagram for 1H/1C conventional application.
THX9321R SUBBASE
CONVENTIONAL
NOT
O/B
AUX/E W2
YY
Y2 Y2
GG
L
K
K
NOT
USED
W
NOT
USED
NOT
USED
HEAT PUMP
USED
C
Rc
R
U1 U1
U1 U1
U2 U2
U2 U2
NOT
USED
C
Rc
R
WIRESAVER
W-O/B
Rc
KC
Honeywell THP9045A
YG C
C
G
FURNACE
W-O/B
W
Rc
RY
WIRESAVER
W-O/B
Rc
KC
Honeywell THP9045A
YG C
W-O/B
Rc
M31302A
Fig. 2. Example wiring diagram for a 2H/1C conventional application.
69-2065EFS—07 2
W2
RY
C
G
W
M31305AFURNACE
THP9045 WIRING MODULE
THX9321R SUBBASE
CONVENTIONAL
NOT
O/B
W
AUX/E
W2
YY
Y2
Y2
GG
NOT
L
USED
K
K
NOT
NOT
USED
USED
HEAT PUMP
USED
C
Rc
R
U1 U1
U1 U1
U2 U2
U2 U2
NOT
USED
C
Rc
R
Rc
Honeywell THP9045A
Rc
RY
AIR HANDLER
Fig. 3. Example wiring diagram for a 2H/2C conventional application.
THX9321R SUBBASE
CONVENTIONAL
NOT
O/B
AUX/E W2
YY
Y2 Y2
GG
L
K
NOT
USED
W
NOT
USED
K
NOT
USED
HEAT PUMP
USED
C
Rc
1
R
U1 U1
U1 U1
U2 U2
U2 U2
NOT
USED
C
Rc
R
Rc
Honeywell THP9045A
Rc
YG C
RY
AIR HANDLER
KC
YG C
G
W-O/B
KC
C
G
WIRESAVER
W-O/B
W-O/B
C
O
Y2 W2
WIRESAVER
W-O/B
M31306A
1
REMOVE R/Rc JUMPER
RW
HEATER
Fig. 4. Example wiring diagram for a 1H/1C system with 2 transformers.
3 69-2065EFS—07
M31300A
THP9045 WIRING MODULE
O/B
AUX/E W2
YY
Y2 Y2
GG
L
K
NOT
USED
1
MATCH THE WIRES FROM THE HEAT PUMP TO THE AIR HANDLER AS NORMAL.
Fig. 5. Example wiring diagram for a 2H/1C heat pump application.
THX9321R SUBBASE
CONVENTIONAL
W
NOT
USED
K
NOT
USED
HEAT PUMP
NOT
USED
C
Rc
1
R
U1 U1
U1 U1
U2 U2
U2 U2
NOT
USED
C
Rc
R
WIRESAVER
W-O/B
Rc
KC
Honeywell THP9045A
YG C
G
W-O/B
C
O
Rc
E
RY
AIR HANDLER
1
M31303A
O/B
W
AUX/E W2
YY
Y2
Y2
GG
NOT
L
USED
K
K
NOT
NOT
USED
USED
1
MATCH THE WIRES FROM THE HEAT PUMP TO THE AIR HANDLER AS NORMAL.
Fig. 6. Example wiring diagram for a 3H/2C heat pump application.
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Toronto, Ontario M1V 4Z9
http://customer.honeywell.com
THX9321R SUBBASE
CONVENTIONAL
HEAT PUMP
® U.S. Registered Trademark
© 2010 Honeywell International Inc.
69-2065EFS—07 M.S. Rev. 12-10
Printed in U.S.A.
NOT
USED
C
Rc
1
R
U1 U1
U1 U1
U2 U2
U2 U2
NOT
USED
C
Rc
R
WIRESAVER
W-O/B
Rc
KC
Honeywell THP9045A
RY
YG C
G
W-O/B
C
O
Rc
AIR HANDLER
1
E
Y2
M31304A
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