Professional Install Guide
System Types
Compatible with 24-volt systems such as forced air, hydronic, heat pump (including dual fuel),
oil, gas and electric.
Does not work with electric baseboard heat (120/240V).
Must be installed by a trained, experienced technician
Read these instructions carefully. Failure to follow these instructions can
damage the product or cause a hazardous condition.
Mercury Notice:
If this product is replacing a control that contains mercury in a sealed tube, do not place the
old control in the trash. Contact the Thermostat Recycling Corporation at 1-800-238-8192 or
thermostat-recycle.org for information on how and where to properly and safely dispose an old
thermostat.
Disconnect power before installation.
Can cause electrical shock or equipment damage.
Round™ Smart Thermostat
TH8732WFH5004
72
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Installation
1
Set Jumper Switches
R Jumper Switch:
For
single
transformer
systems, move
switch up.
For
dual
transformer
systems, move
switch down.
Jumper Switch for humidifier, dehumidifier, or ventilation:
For
single wire
products,
set
the switch to 1
Wire.
For
two wire
products,
set the switch to
2 Wire.
2
Wiring: Terminal Designations
L
Heat pump system monitor
K
Optional C-wire adaptor
C
Common wire from secondary
side of cooling transformer, if 2
transformers
G
Fan relay
W2
(AUX)
2nd stage heat relay (heat pump
auxiliary, emergency heat)
Y2
2nd stage compressor
contactor
W
(O/B)
1st stage heat relay (changeover
valve for heat pumps)
Y
1st stage compressor
contactor
U1
Terminal for indoor air quality
products (humidifier, dehumidifier,
ventilator)
R
Heating power. Connect to
secondary side of heating
system transformer
U2
Terminal for indoor air quality
products (humidifier, dehumidifier,
ventilator)
Rc
Cooling power. Connect to
secondary side of cooling
system transformer
3
Connect wires and mount wallplate
Connect wires and mount the wall
plate using screws and anchors
provided.
Note:
The illustration to the right
shows the most common wiring.
REQUIRED: A C-Wire (common wire)
is needed for 24 VAC power.
Electrical Ratings:
Terminal
Voltage (50/60 Hz)
Max. Current Rating
W - O/B (Heating)
18 to 30 VAC
1.00 A
W2 - Aux/E (Heating)
18 to 30 VAC
0.60 A
Y (Cooling)
18 to 30 VAC
1.00 A
Y2 (Cooling)
18 to 30 VAC
0.60 A
K
18 to 30 VAC
1.00 A
G (Fan)
18 to 30 VAC
0.50 A
L (Output)
18 to 30 VAC
1.00 A
U1, U2
18 to 30 VAC
0.40 A
4
Firmly snap the thermostat into
place
The thermostat will glow and
display the screen for up to three
minutes while it starts up.
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