Watts FloorStat 500650-120CS Owner's Manual

Owner's Guide
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 comfort.
On/Stand-by switch
GFCI warning light
and test button
Day and Clock settings
Programming Mode PGM
Mode Selection/
Exit Prog.
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 factory-set to the following default values (
Switch Function
SW1 Temperature format*
SW2 Early start
SW3 Time format
*If you switch from °F to °C or vice versa, the
to be redefined (only if setpoints were modified from their factory-set default).
† When using AUTO mode, the FloorStat calculates the optimum start time to
obtain the desired temperature by the set time. The heating system could be
started as early as 6 hours prior to set time when required. The FloorStat will
automatically re-evaluate (every day) the optimum start time based on the
previous day's performance.
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, invert steps.
NOTE: The screw cannot be removed completely.
Floor Temperature
Current Mode and
Setpoint
Current Program No.
Pre-defined Setpoints
Display Backlighting
Button
Increase/Decrease
Temperature
UP DN
°F °C
† Disable Enable
12 h 24 h
, , and setpoints may need
When power is applied for the first time, the LCD displays: 0:00,
MO (Monday),
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
displayed and the relay is closed (energized).
• HI: The floor temperature is above 140°F (60°C), or the temperature
sensor is defective.
The GFCI monitors electricity flow for any
loss of current; if there is, the thermostat
will cut-off 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
heating indicator
2. Press TEST:
• Successful: Test warning light is ON
):
and power to heating system is cut-off.
• Unsuccessful: the Test warning light is
OFF. Cut power to heating system from
the main power panel and call customer
service.
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.
The 500650 thermostat is programmed with the following default
temperature control setpoints:
Symbol
Comfort
Economy
Vacation
If you wish to modify a setpoint, follow these steps:
1. Set the desired temperature using the
buttons.
2. Press and Hold the
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 Comfort/Economy
programs as defined in the schedule.
1. To activate, press Mode/Ret until
icon (e.g.,
displayed.
Temporary Bypass — Maintains a specific temperature until the
beginning of the next program. Set the desired temperature using the
OR press
Manual — Maintains a manually-defined setpoint.
1. To activate, press Mode/Ret until
2. Set temperature using
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.
Watts Radiant, Inc.

3. FIRST POWER-ON

, and floor temperature.
Correct Incorrect

4. GFCI TEST

until the
is displayed.

5. TEMPERATURE SETPOINT

Setting
(when you are at home)
(when asleep or away from home)
(away for prolonged absence)
or or button.
is displayed. A program
) and corresponding setpoint (e.g.,
or to use a pre-defined setpoint.
is displayed.
OR press or
Programmable FloorStat 04/28/2006
is
Default New
82°F (28°C) ___°__
68°F (20°C) ___°__
50°F (10°C) ___°__
Comfort
Economy
Vacation
Higher
Lower
or ) are also
to use Comfort or
920-115-010-00-1-A