Honeywell Programmable Thermostat T4 Pro Installation Guide
Power options
Insert R and C wires into
designated terminals
for primary AC power (C
terminal is optional if
batteries are installed,
but it is recommended).
Remove wires by
L/A
O/B
AUX
E
A
S
S
Insert AA
Y
W2
batteries for
primary or
backup power.
Y2
G
C
W
K
U
U
R
Rc
depressing the terminal
tabs.
UWP Mounting System
Setting Slider Tabs
Set R Slider Tab.
•
•
•
Use built-in jumper (R Slider Tab)
to differentiate between one or two
transformer systems.
If there is only one R wire, and it is
connected to the R, Rc, or RH terminal, set
the slider to the up position (1 wire).
If there is one wire connected to the R
terminal and one wire connected to the Rc
terminal, set the slider to the down position
(2 wires).
NOTE: Slider Tabs for U terminals should be
left in place for T4 Pro models.
R/Rc Slider Tab
(built-in jumper)
UWP Wiring terminal designations
L/A
- A
Not used for T4 thermostat.
S
S
Y
Not used for T4
thermostat.
O/B
Changeover valve
Compressor contactor
(stage 1)
AUX -
W2
Auxiliary heat (TH4210U
only)
Not used for T4
thermostat.
Emergency heat (TH4210U
only)
E
Y2
G
Fan
W
Heat (stage 1)
Note: Not all
terminals may be
used, depending
on the system
type that is being
wired. The most
commonly used
terminals are
24VAC common. For 2
transformer systems,
use common wire from
cooling transformer.
Connect to K on C-wire
adaptor**
K
C
24VAC power from heating
transformer*
R
U
U
Not used for T4
thermostat.
24VAC power from cooling
transformer*
Rc
shaded.
*
Terminal can be jumped using Slider Tab. See “Setting Slider Tabs” above.
** The THP9045A1098 C-wire adaptor is used on heat/cool systems when you only have four wires at the
thermostat, and you need a fifth wire for a common wire. Use the K terminal in place of the Y and G terminals on
conventional or heat pump systems to provide control of the fan and the compressor through a single wire—the
unused wire then becomes your common wire. See THP9045 instructions for more information.
3
| General | Details |
|---|---|
| Name | Honeywell Programmable Thermostat T4 Pro Installation Guide |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 1.08 MB |
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