Installation &
Operation Manual
SunStat® Pro II
Programmable Thermostat
Model 500775 (-BB, -HB, -SB, -WB)
Local building or electrical codes may require modifications to the information
provided. You are required to consult the local building and electrical codes
prior to installation. If this information is not consistent with local building or
electrical codes, the local codes should be followed.
Items included
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
(5) 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)*
As with any electrical product, care should be taken to guard
against the potential risk of fire, electric shock, and injury to
persons. The following must be observed:
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use
information can result in death, serious personal
injury, property damage, or damage to the
equipment.
Keep this Manual for future reference.
Installation must be performed by qualified personnel, in accordance with
local codes and standards. A licensed electrician is recommended.
*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.
• Wire all circuits as Class 1, Electric Light and Power Circuits.
• Wire all circuits with insulation rated 600V minimum.
• Mount this control only to a grounded metallic box or a nonmetallic box.
• Use power supply wires suitable for at least 90°C.
• High voltage – disconnect power supply before servicing.
• 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.
• Do not exceed 15 amps on this thermostat control. Doing so will cause risk
of fire hazard and damage.
• 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.
To prevent the risk of personal injury and/or death, make sure
power is not applied to the product until it is fully installed and
ready for final testing. All work must be done with power turned
off to the circuit being worked on.
House Wiring
Pull power supply wiring to the control location. Consider the following:
• 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.
• 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.
The SunStat Pro II model 500775 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 Schedule ready to go, and a GFCI inside to meet safety needs.
Installation
Locating the Control
Find a suitable location for the control. Consider the following:
• 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 all 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. 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
