Watts 500650-120B Owner's Manual
120-VAC Models: 500650-120CS, -120B, -120BH, and -120BW
240-VAC Models: 500650-240CS and -240B
The Watts Radiant 500650 programmable FloorStat will provide both
energy savings and comfor t.
NOTE: The 500650 face plate must be mounted on a PB112 Series
Power Base.
The FloorStat is designed to control the floor temperature. To avoid dam-
age to your floor, we recommend you follow the supplier’s instructions.
The FloorStat is equipped with an On/Standby switch making it possible
to put the FloorStat in “sleep” mode when its use is no longer required
(i.e., summer). This will not affect the clock or programming.
1. SWITCH SELECTION
This FloorStat is factor y-set to the following default values ( ):
Switch
Function
UP
DN
SW1
Temperature format*
°F
°C
SW2
Early star t
†
Disable
Enable
SW3
Time format
12 h
24 h
*If you switch from °F to °C or vice versa, the , , and setpoints may need
to be redefined (only if setpoints were modified from their factor y-set default).
†
When using AUTO mode, the FloorStat calculates the optimum star t time to
obtain the desired temperature by the set time. The heating system could be
star ted as early as 6 hours prior to set time when required. The FloorStat will
automatically re-evaluate (ever y day) the optimum star t time based on the
previous day’s per formance.
Switches are located on the rear of the face plate. To modify, switch
UP or DN.
2. MOUNTING FACE PLATE
To mount the face plate onto the power base, refer to the diagrams
below:
To remove the face plate from the power base, inver t steps.
NOTE: The screw cannot be removed completely.
Owner’s Guide
On/Stand-by switch
GFCI warning light
and test button
Day and Clock settings
Programming Mode PGM
Mode Selection/
Exit Prog.
Floor Temperature
Current Mode and
Setpoint
Current Program No.
Pre-defined Setpoints
Display Backlighting
Button
Increase/Decrease
Temperature
3. FIRST POWER-ON
When power is applied for the first time, the LCD displays: 0:00,
MO (Monday), , and floor temperature.
1. Press Hour – Min to set the current time.
2. Press Day to set current day.
One of the two following messages may be displayed if the installation
is incorrect:
• LO: The floor temperature is below 32°F (0°C), or the temperature
sensor is defective, or not connected. The heating indicator is
displayed and the relay is closed (energized).
• HI: The floor temperature is above 140°F (60°C), or the temperature
sensor is defective.
4. GFCI TEST
The GFCI monitors electricity flow for any
loss of current; if there is, the thermostat
will cut-of f power to the heating system. We
recommend you test the GFCI immediately
after installing the control module, and once
a month thereafter to ensure it is operating
properly. To test:
1. Increase the temperature until the
heating indicator is displayed.
2. Press TEST:
• Successful: Test warning light is ON
and power to heating system is cut-of f.
• Unsuccessful: the Test warning light is
OFF. Cut power to heating system from
the main power panel and call customer
ser vice.
3. When successful, reset FloorStat (On/Standby) to power the
heating system.
NOTE: If the warning light comes on during normal operation, cut power
to heating system from the main power panel and have an electrician
verify the installation.
5. TEMPERATURE SETPOINT
The 500650 thermostat is programmed with the following default
temperature control setpoints:
Symbol
Setting
Default
New
Comfor t
(when you are at home)
82°F (28°C)
___°__
Economy
(when asleep or away from home)
68°F (20°C)
___°__
Vacation
(away for prolonged absence)
50°F (10°C)
___°__
If you wish to modify a setpoint, follow these steps:
1. Set the desired temperature using the
buttons.
2. Press and Hold the or or button.
3. Release button when symbol is displayed.
4. Press Mode/Ret to exit.
6. OPERATING MODES
This thermostat has three operating modes:
Automatic — Executes the Comfor t/Economy
programs as defined in the schedule.
1. To activate, press Mode/Ret until is displayed. A program
icon (e.g., ) and corresponding setpoint (e.g., or ) are also
displayed.
Temporary Bypass — Maintains a specific temperature until the
beginning of the next program. Set the desired temperature using the
OR press or to use a pre-defined setpoint.
Manual — Maintains a manually-defined setpoint.
1. To activate, press Mode/Ret until is displayed.
2. Set temperature using OR press or to use Comfor t or
Economy setpoint.
Vacation — Maintains the Vacation setpoint when away for a
prolonged absence (e.g., a vacation). Can also be done remotely
through your telephone.
1. Press to activate.
Correct
Incorrect
Comfort
Economy
Vacation
Higher
Lower
Watts Radiant, Inc.
Programmable FloorStat
04/28/2006
920-115-010-00-1-A