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SunStat Dial
Dial Thermostat
Model 500710
Owner’s Manual
Your new SunStat Dial thermostat is designed to control the voltage to
either a 120VAC or 240VAC resistive oor warming system.
Please follow this manual for complete installation and operation instructions.
If you have any questions or comments, try calling Technical Support at
1-800-276 -2419.
CAUTION: Make sure you are qualied and are familiar with house wiring.
This is a line voltage device that could cause serious injury or damage if
improperly installed.
1. Preparation
1. Unpack your thermostat and make sure everything is in good condition:
•Thermostat
•Floor sensor
•Small screwdriver
•Mounting screws
•Wire nuts for wiring connections
If any parts are missing or damaged, contact the store where you purchased
this thermostat. Do not install a damaged part.
2. Gather the following tools and supplies:
•Phillips screwdriver, hole saw
•Wire strippers, “sh tape”, other electrical tools
•Electrical box for thermostat:
a. If you are connecting to power leads from only 1 or 2 oor warming
systems, you may use a single-gang, 31⁄2 inch deep box.
b. If you are connecting to power leads from 2 or 3 oor warming systems,
use a 4x4x21⁄8 inch or deeper box (not a 2-gang box) when your wall studs
are still exposed. Install a single-gang “mud-ring” cover on the box before
installing dr ywall materials.
c. For more than 3 oor warming systems or other layouts, you may need
to install a junction box. See the installation instructions for your oor
warming system for more information.
ALWAY S: Wire all circuits as Class 1, Electric Light and Power Circuits.
ALWAY S: Wire all circuits with insulation rated 600V minimum.
ALWAY S: Mount this control only to a grounded metallic box or a
nonmetallic box.
ALWAY S: Use power supply wires suitable for at least 90°C.
CAUTION: High voltage – disconnect power supply before servicing.
CAUTION: The GFCI in this control does not protect against shock if both
2. Installation
Remove the Thermostat Face
1. Remove the thermostat Front Module
from the Power Module by opening the
door and loosening the screw.
2. Pull outward near the bottom on the
Front Module and lift off. Be careful not
to bend or damage the 14-pin electrical
connector on the back of the Front
Module. bottom on the Front Module
and lift of f.
Prepare the Wiring
1. Find a location for your thermostat. It is suitable for indoor use only, on
insulated or uninsulated walls. Locate it about 4
oor on an inside wall. Make sure it is well ventilated and not located in a
conned space such as a small closet or cabinet. Avoid placing it near other
heat sources such as hot-water piping, heat duct, wall-mount lighting, and
direct sunlight to help prevent adversely affecting the thermostat.
2. Turn off the power to the oor warming system at the main circuit panel
before doing any electrical work.
3. A qualied electrician should run a dedicated circuit from the main circuit
panel to the thermostat location.
4. If a dedicated circuit is not possible, you may tap from another circuit in the
room. Make sure there is enough load capacity (amps) to handle the addition
bare conductors are touched at the same time.
front
module
1
⁄2 feet to 5 feet above the
power
module
of your oor warming system, and that it is NOT wired in series with any other
device, including other GFCIs.
5. The circuit breaker in the main circuit panel should be 15 amps maximum
for a oor warming system totaling 12 amps or less. For larger systems up
to 15 amps, use a 20 amp maximum circuit breaker. Never exceed 15 amps
on this thermostat. You may consider using an arc-fault (AFCI) type circuit
breaker for additional protection.
6. Pull the power supply wiring into this box, leaving about 6 inches of wire.
7. Pull the oor sensor wire and the power lead wires from your oor warming
system up the wall, into this box. Refer to your oor warming system
installation instructions for placement of the oor sensor tip into the oor area.
Note: The sensor wires should not be run in the same conduit as line voltage
wires to avoid possible interference. If the sensor lead wires are not long
enough, they may be extended an additional 15 feet (4.5 m) using minimum
20-gage 2-conductor wire or up to 50 feet (15 m) using shielded wire.
8. Mount the electrical box.
1-4
from
power
supply
to
oor
warming
system
5
sensor
Connect Wires
1. Match and connect the two
wires marked “LINE1” and
“LINE2” to the power supply wires
using the wire nuts provided.
2. Gently tug on the wires to
make sure they are secure,
otherwise a wire could loosen
and cause failure.
3. Over wrap the wire nuts with
electrical tape to better secure
them to the wires.
4. Match and connect the two
wires marked “LOAD1” and
“LOAD2” to the oor warming
system lead wires and secure
these wires the same way.
5. Connect the house ground
wire to the green or bare lead
wire(s) of your oor warming
system.
6. Insert the ends of the oor
sensor wire into the “SENSOR”
terminals (1 and 2) and tighten
the screws. There is no polarity,
so it does not matter which wire
end goes into which terminal.
CAUTION: Before continuing,
make sure your power supply
voltage matches the voltage
rating of your oor warming
system.
Connecting 240V to a 120V oor
warming system will cause overheating and damage to the system and may damage the control, other wiring,
oor coverings, etc.
SunStat Relays
1. If you want to use your thermostat to drive a SunStat Relay(s) (ask
your dealer about this convenient way to control larger systems with one
thermostat), rst read and follow the instructions for the SunStat Relay
thoroughly.
2. Pull 2-conductor wire, size 18- to 24-gage, through the wall from the
SunStat Relay, into this electrical box. This wire may be up to 100 feet (30 m)
in length from the thermostat to the last SunStat Relay installed.
3. Connect the wire ends into the “RELOUT” terminals (3 and 4) and tighten
the screws (Observe polarity of the wires when connecting to the SunStat
Relay).
Mount the Thermostat
1. Carefully fold and press the wires back into the electrical box. Do not use
the thermostat to push them in, as this may
cause connections to loosen and possible
failure.
2. Secure the thermostat Power Module into the
box with the mounting screws provided.
3. Carefully snap the Front Module onto the
Power Module. Be careful not to bend or
damage the 14-pin electrical connector on the
back of the Front Module.
4. Tighten the screw.
5. Switch on the power at the main circuit
panel.
NOTE to contractors: After installing the
thermostat, be sure to:
a. Switch on the thermostat and turn up
the temperature to make sure it
is heating for a few minutes (section 3)
b. Test the GFCI (section 3).
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3. Operation
5. Specications
On/Off Switch
1. Slide the on/off switch to the upper
position, turning the thermostat on. A green
light will show on the front indicating the
thermostat is turned on. If the light is amber, it
indicates power is applied to the oor warming
system.
2. To turn the thermostat of f anytime, slide the
on/off switch to the lower position. No heating
will occur.
on/off
Adjust the Temperature
1. Turn the dial clockwise to increase the oor temperature. The light on the
front will be amber when power is applied to the oor warming system.
2. Turn the dial counterclockwise to decrease the oor temperature.
Air or Floor Sensing
During installation, your thermostat should have been connected to a
oor sensor to be embedded with the oor warming system. This is the
recommended method to properly control the system.
However, if the oor sensor was not connected or was damaged, the
thermostat will sense the air temperature instead, becoming an air
thermostat. A new oor sensor should be installed to enable operation in
Floor Sense Mode as soon as possible. The air sense mode must be used with
caution to avoid overheating the oor.
Test the GFCI
There is a GFCI (Ground Fault Circuit Interrupter) inside the thermostat. It
is designed to help protect people from possible electrical shock if the oor
warming system has been damaged.
To make sure the GFCI is operating, test it after it is installed and once each
month:
1. Make sure the thermostat is HEATING. You may need to increase the
temperature temporarily.
2. Press the GFCI Test button on the side of the thermostat. A red light should
show next to the GFCI Test button. You should also hear a click, indicating
power has been removed from the oor warming system. If any of these
indicators fail, turn off the thermostat and replace it. Do not continue to use.
3. To reset the GFCI, slide the On/Off switch off and back on. If the GFCI does
not reset, turn the thermostat off and go to section 4 “Troubleshooting” for
help.
Power Supply 120/240 VAC, 50/60 Hz
Maximum Load 15 amps, resistive
Maximum Power 1800 watts at 120 VAC
3600 watts at 240 VAC
GFCI Class A (5 milliamp trip)
Setting Range 40 °F to 99 °F (4 °C to 37 °C)
Accuracy ± 0.9 °F (0.5 °C)
Sensor Thermistor, 10k NTC, double-insulated
Storage Temp 0 °F to 120 °F (0 °C to 49 °C)
ETL Listing Control No. 3037530
Conforms to UL 873, UL 943, CSA C22.2 No.
24, and CAN/CSA C22.2 No. 144
Limited Warranty
Watts Radiant, Inc. warrants this thermostat control and sensor (the product)
to be free from defects in material and workmanship for a period of (2) years
from the date of original purchase from authorized dealers. During this period,
Watts Radiant, Inc. will replace the product or refund the original cost of the
product at Watts Radiant’s option, without charge, if the product is proven
defective in normal use. Please return the thermostat to your distributor to
begin the warranty process.
This limited warranty does not cover shipping costs. Nor does it cover a
product subjected to misuse or accidental damage. This warranty does not
cover the cost of installation, diagnosis, removal or reinstallation, or any
material costs or loss of use.
This limited warranty is in lieu of all other warranties, obligations, or liabilities
expressed or implied by the company. In no event shall Watts Radiant, Inc.
be liable for consequential or incidental damages resulting from installation
of this product. Some states or provinces do not allow limitations on how
long an implied warranty lasts, or the exclusion or limitation of incidental or
consequential damages, so the above exclusions or limitations may not apply
to you. This warranty gives you specic legal rights and you may also have
other rights that vary from state to state.
IOM-WR-SS-Dial 1125 Effective: 07/01/2011
PPLIMP08007 IND © 2007-2011
4. Troubleshooting
Problem Solution
Thermostat works
but no heat from the
system.
No lights showing.
GFCI is tripped.
Right light blinking
on front of
thermostat.
1. Check wiring connections.
2. If GFCI is tripped, reset thermostat with on/off switch.
3. Check re sistances on oor warming system. See
manual for system.
1. Check wiring connections.
2. Check circuit breaker or other protection “upstream” of
thermostat.
3. Check the 14-pin connection on the back of the Front
Module. Sometimes the pins can become misaligned when
connecting the Front Module to the Power Module.
1. Check wiring connections.
2. Reset thermostat by switching off/on.
3. Check re sistances on oor warming system. See
manual for system.
> 1s on / 1s of f : oor sensor fault. Check connections,
replace oor sensor, or disconnect oor sensor and use
air sensing.
> 0.5s on / 0.5s off : air sensor fault. Connect oor
sensor, or replace thermostat.
> 0.1s on / 0.1s of f : “End- of-life” indication. GFCI will
no longer function correctly or safely. Reset the circuit
breaker or replace Relay.
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