Owner’s Manual
SunStat
®
View
Programmable Thermostat
Model 500750
The SunStat View model 500750 is designed to operate either a 120 VAC or
240 VAC resistance floor heating system. It comes with an easy setup wizard, a
typical program ready to go, and a GFCI inside to meet safety needs.
Please follow this manual for installation and operating instructions. Leave
these instructions with the homeowner.
Installation
Cautions to Follow
You are required to thoroughly read all installation instructions and product
safety information before beginning the installation of this product. FAILURE
TO COMPLY WITH PROPER INSTALLATION AND MAINTENANCE INSTRUCTIONS
COULD RESULT IN DAMAGE TO THE SYSTEM OR ELECTRIC SHOCK CAUSING
PROPERTY DAMAGE, PERSONAL INJURY AND/OR DEATH. Watts is not
responsible for damages resulting from improper installation and/or
maintenance.
Local building or plumbing codes may require modifications to the information
provided. You are required to consult the local building and plumbing codes
prior to installation. If this information is not consistent with local building or
plumbing codes, the local codes should be followed.
CAUTION: This product requires electrical wiring. It is recommended that
this product is installed by a qualified technician. Local codes may require
this product be installed by an electrician. Prior to installation, consult
your local codes for what is acceptable in your area. To the extent this
information is not consistent with local codes, the local codes should be
followed.
ALWAYS: Wire all circuits as Class 1, Electric Light and Power Circuits
ALWAYS: Wire all circuits with insulation rated 600V minimum.
ALWAYS: Mount this control only to a grounded metallic box or a nonmetallic
box.
ALWAYS: Use power supply wires suitable for at least 90°C.
WARNING: High voltage – disconnect power supply before servicing.
WARNING: The GFCI (ground-fault circuit interrupter) in this thermostat
control does not protect against shock if both bare conductors are touched
at the same time.
WARNING: Do not exceed 15 amps on this thermostat control. Doing so will
cause risk of fire hazard and damage.
WARNING: Make sure the house power supply voltage matches the voltage
rating of the floor heating system. Do not apply 240 VAC to a 120 VAC rated
system. Connecting the wrong voltage may cause overheating and damage
to the system, the control, floor coverings, etc.
Parts Needed
Contents of package:
Unpack the thermostat control and make sure everything is in good condition.
Do not use a damaged control or part. The package comes with these items:
(1) Thermostat
(1) Thermostat floor sensor
(4) Wire nuts (Marettes®)
(2) Mounting screws
(1) Screwdriver
Tools and supplies needed:
- No. 2 Phillips screwdriver
- Hole saw (if installing in an existing wall)
- Wire strippers, wire cutters, and other electrical tools
- Electrical wall box (plastic or metal)*
*NOTE: A single-gang extra-deep box allows sufficient space to connect 1 or 2
heating mats or cables. For 3 heating mats or cables, a 4-inch square extra-deep
electrical box with a single-gang “mud ring” is necessary. Alternately, a junction
box may be installed to connect multiple heating mats or cables, then run
power supply wire from the junction box to the control electrical box. See the
Installation Instructions provided with the floor heating system for
more details.
Locating the Control
Find a suitable location for the control. It is designed for indoor dry location only.
It may be placed on an insulated or uninsulated wall, preferably an interior wall
to avoid overheating from outside sun heat. Keep it away from water sources
such as sinks, showers, and bathtubs as well as heat sources such as hot-water
piping, heat ducting, wall-mount lighting, and direct sunlight. Locate it at a
suitable height, normally about 4-1/2’ to 5’ (1.4 m to 1.5 m) from the floor.
Mounting the Electrical Box
When mounting on an existing wall, cut the opening for the electrical box for the
control. To make it easier to pull the wiring, wait to install the electrical box until
after all wiring is drawn into this opening.
When mounting on an open wall, secure the electrical box for the control to the
wall stud.
When mounting on an open wall, conduit from the electrical box to the floor is
recommended (check local codes for requirements) for additional protection.
Install one conduit for the floor sensor. Install another conduit for the floor
heating system power leads. Refer to the Installation Instructions supplied with
the floor heating system for additional installation details.
Wiring
WARNING: Turn off power at the circuit breaker before doing any electrical
work.
House Wiring
A qualified person should run a dedicated circuit from the main circuit breaker
panel to the control location. If a dedicated circuit is not possible, it is acceptable
to tap into an existing circuit. However, there must be enough capacity to
handle the load (amps) of the floor heating system being installed and any
possible appliance, such as a hair dryer or vacuum cleaner. Avoid circuits that
have ballasted lighting, motors, exhaust fans, or hot tub pumps due to possible
interference.
The circuit breaker should be rated 20 amps for total circuit loads) up to
15 amps. A 15 amp circuit breaker may be used for total circuit loads up to
12 amps. A GFCI (ground-fault circuit interrupter) or AFCI (arc-fault circuit
interrupter) type circuit breaker may be used if desired, but is not necessary.
WARNING: Do not exceed 15 amps on this thermostat control. Doing so
will cause risk of fire hazard and damage.
Pull power supply wiring to the control location. Leave about 6 to 8 inches (15
to 20 cm) of wire for connections later. This wiring should be size 12 or 14 AWG
following appropriate local code requirements.
Floor Sensor
Pull the floor sensor wire up the wall (or conduit) to the control location, leaving
about 6 inches (15 cm) of wire for connection later. The sensor wire may be cut
shorter if desired, but do not cut it shorter until the sensor is fully installed (see
below).
Note: If the sensor wire is not long enough to reach the control location, it may
be extended an additional 15 feet (4.5 m) using minimum 20 AWG 2-conductor
unshielded wire, or an additional 50 feet (15 m) using shielded wire. When
using shielded wire, the “shield” must be connected to the lower sensor
terminal, nearest to Bus A. A junction box may be required by local code for the
connection to this extension wire.
After the floor heating system is completely installed according to its
instructions, secure the thick sensor tip to the floor. It must be located halfway
between heating wires and at least 1 foot into the heating area. Use hot-glue to
secure the sensor tip and wire in place. Do not cross over a heating wire. Avoid
placing it in an area where heating wires are spaced further apart than the rest
of the floor, like a large gap between mats or cables. Avoid placing it in an area
where a heat duct or recessed light will cause improper measurements. Try to
avoid locating it where future items such as a clothes hamper or similar could
trap heat and cause improper measurement.
Finish securing the sensor wire along the floor and up the wall. At the control
location, cut the sensor wire shorter if needed, leaving at least 6 to 8 inches (15
to 20 cm) of wire for connections later. Re-strip the sensor wire ends 1/8” to
3/16” (3 mm to 4.5 mm) long. If the ends are stripped longer than this they may
short-circuit, resulting in an error code.
Mat or Cable Power Leads
Pull the power lead wires from the floor heating system into the control
location. Leave about 6 to 8 inches (15 to 20 cm) of wire for connections.
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