Watts SunStat 500750 Owner's Manual - Operation
Wire Connections
Match and connect the two wires marked “LINE1(L)” and “LINE2(N)” to the
house power supply wires using the wire nuts provided. Gently tug on the wires
to make sure they are secure, otherwise a wire could come loose and cause
failure. For added security, overwrap the connections with electrical tape.
Match and connect the two wires marked “LOAD1” and “LOAD2” to the power
lead wires from the floor heating system. Secure these wire connections the
same way.
CAUTION: 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.
Connect the house ground wire to the ground wire(s) from the floor heating
system. If the electrical box is metal, a short length of wire must be secured to
the electrical box from this ground connection.
Insert the ends of the floor sensor wire into the terminals marked “SENSOR” and
snug the screws. It does not matter which wire goes into which terminal.
SunStat Relay (optional)
Read and follow the instructions provided with the SunStat Relay.
Pull 18 AWG to 24 AWG 2-conductor shielded wire through the wall from the
SunStat Relay location to this control location. This wire may be up 100 feet (30
m) in length (for 18 AWG shielded wire). Strip the 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.
Connect the wire ends into the “BUS” A and B terminals. Make sure the wire in
“A” terminal is connected to an “A” terminal in the SunStat Relay.
Mounting the Control
Carefully press the wires back into the electrical box. Do not use the control to
push them in, as this may cause connections to loosen and possible failure.
Loosen the screw and remove the front module from the power module. Secure
the power module into the electrical box with the mounting screws provided.
Snap the front module onto the power module and tighten the screw. Press the
Screw Cover in place to cover screw.
Customizing the Control
The door may be removed and painted to match a room color or special color.
Use a plastic primer to prepare the surface of the door. Use only paints that are
acceptable for this type surface and follow the paint manufacturer instructions.
CAUTION: Do not paint the door while it is attached to the control and do
not paint any other part of the control. Doing so will cause risk of fire and
damage.
Operation
Overview of Features and Display
Press anywhere on the display if the screen is blank. This wakes the display.
On/Off and GFCI
On/Off and Reset
Pressing will turn the thermostat on or off. This also Resets the thermostat to
clear an error or GFCI fault. See “GFCI Testing” and “Troubleshooting”.
GFCI Testing
The GFCI (Ground Fault Circuit Interrupter) in this control must be tested when
installation is finished and once each month.
• Make sure the control shows it is Heating. This may require temporarily
increasing the setpoint temperature.
• Press the GFCI TEST button. GFCI TRIP should be indicated on the control.
There will also be a click sound, indicating power has been removed from
the floor heating system. If either of these indications fail, turn off the
thermostat and replace it. Do not continue to use.
• To reset the GFCI TRIP, press the off and back on.
Startup Wizard
This thermostat comes with a “wizard” to help quickly get the user through basic
setup.
• When first powered up, or upon resetting the factory defaults, the display
shows an introduction. Press “Begin” to proceed.
• Select the language desired from English, French, or Spanish. The selection
will be highlighted. Press “Next”.
• Select the format for the time (12 hour or 24 hour clock) and temperature
(Fahrenheit or Celsius) and press “Next”.
• Set the time and date and press “Next”.
• The last display shows a short message before pressing “Finish”.
Adjusting the Temperature
Normally the thermostat will run automatically based on the programmed
settings. However, these settings may be overridden temporarily or for a
specified period of time.
Overriding Temporarily
To only override the program until the next scheduled time, press
or
to
select the desired setpoint temperature. After a few seconds
will show. To
cancel this override and return to normal scheduled settings press
.
Holding the Override
To override the program for a specific period of time, press the
or
to select
the desired setpoint temperature. For a few seconds, the display will show an
H
button. Press this button. The display will show the Hold setting. Press
or
to select the desired number of days from 1 to 99, or select “Continuous”.
Press
Done!
to save this selection. The thermostat will operate at the setpoint
temperature for the number of days selected, or continuously, before returning
to normal schedule settings. This feature may be cancelled by pressing the
.
Vacation Hold
To quickly override the program schedule to a low setpoint while on vacation,
press the . Press
Vacation
and confirm. The display will show the preset
temperature and “Vacation”. This temperature will hold until
is pressed.
!
Screw Cover
Cover Screw
Front Module
Load 1
Line 1
Line 2
Load 2
Floor Sensor
Connection
Power Module
!
Stylus