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500650

      400-115-015-D                    20/12/06                    1/2

Watts Radiant’s 500650 programmable thermostats have three tem-
perature control modes:

1

 Place the switch in Standby to cut power to the heater when not in use (e.g., in the sum-

mer). This will not affect the time and temperature settings.

2

 If your thermostat is installed on a power base equipped with a ground fault protection,

to reset the ground fault protection, switch the thermostat to Standby and back to On.

3

 The thermostat displays the percentage of heating time required to maintain the desired

temperature. For example,   is displayed when heating is activated 40 percent of the
time.

4

 

GFI

 appears when the ground fault protection has tripped.

Some thermostat configurations can be
modified via switches on the back of the
faceplate (control module).
Default (factory) settings are inside the gray
cells.

n

Refer to the installation 
instructions of the power 
base.

o

Insert the tabs at the top of 
the control module in the slots 
at the top of the power base.

p

Secure the control module 
using the captive screw 
underneath the base

.

NOTE

: Keep the thermostat's air vents clean and unobstructed at all times.

n

Press the 

Hour

 button to set the hour.

o

Set the 

Min

 button to set the minutes.

p

Set the 

Day

 button to set the day.

q

Press 

Mode/Ret

 to exit. 

Daylight Savings Time

The thermostat can automatically re-adjust its clock at Daylight Sav-
ings Time changeover. When this function is enabled (On), the ther-
mostat switches to Daylight Savings Time on the second Sunday of
March and to normal time on the first Sunday of November.

NOTE

: The function is disabled (default setting) when the clock loses

its setting.

n

Press the 

Day

 button (3 seconds) until 

DLS

 appears 

on the screen.

o

Press the 

 to toggle between On (enabled) and Off 

(disabled).

p

Press the 

Day

 button briefly. The year setting is dis-

played.

q

Press the 

 to set the current year.

r

Press the 

Day

 button briefly. The month setting is dis-

played.

s

Press the 

 to set the current month.

t

Press the 

Day

 button briefly. The date setting is dis-

played.

u

Press the 

 to set the current date.

v

Press 

Mode/Ret

 to exit.

The display illuminates for 12 seconds when the backlight button is
pressed.
When either of the 

 buttons is pressed, the display also illuminates

for 12 seconds. The setpoint temperature appears for 5 seconds,
then the actual (measured) temperature is displayed.

6.1

Setpoint Temperature

The thermostat normally displays the actual (measured) temperature.
To view the setpoint, press one of the 

 buttons once. The setpoint

will appear for the next 5 seconds.
To change the setpoint, press one of the 

 buttons until the desired

temperature is displayed. To scroll faster, press and hold the button.

6.2

Preset Temperatures

The thermostat has 3 preset temperatures:

Comfort temperature 

Economy temperature 

Vacation temperature 

To use a preset temperature, press the corresponding button. The
corresponding icon  ,   or   will be displayed.
The following table shows the intended use and the default setting of
each of the preset temperatures.

To store a preset temperature:

n

Set the desired temperature using the 

 buttons.

o

Press and hold the corresponding button until the corresponding 
icon is displayed.

n

Description

1.

A mode:

controls the ambient air temperature

F mode:

controls the floor temperature using an
external temperature sensor

AF mode:

controls the ambient air temperature

maintains the floor temperature within desired
limits using an external temperature sensor

Display

% of heating time

1 to 24% 25 to 49% 50 to 74% 75 to 99%

100%

o

Configuration

2.

#

Configurations

UP

DN

1

Display format

°F / 12 h

°C / 24 h

2

Early Start

a

a.

Early Start can be used in Automatic mode only. When this function is enabled, the 
thermostat calculates the optimal time to start heating in order to obtain the desired 
temperature by the set time. The thermostat re-assesses the start time daily based 
on the previous day’s results.

Enable

Disable

3

Temperature control mode

b

b.

To select the F mode, place the switch in the F position. To select the AF mode, 
place the switch in the AF position and ensure that the remote temperature sensor 
is connected to the thermostat. To select the A mode, place the switch in the AF 
position and ensure that the remote temperature sensor is 

NOT

 connected to the 

thermostat.

F

AF

p

Installation

3.

On/Standby switch

 1 

and GFCI reset 

2

Day and time 
settings

Temperature 
adjustment buttons

Program button

Mode selection /
program exit

Temperature display

Mode display

Period display

Temperature 
preset buttons

Time and day display

Percentage of 
heating time 

3

Backlight button

Program 
clear button

Preset temperature 
indicator

Appears when the 
setpoint is displayed

Temperature control 
mode indicator

Ground fault indicator 

4

Power base

Control module

Air vents

Air vents

q

Clock and Day Setting

4.

r

Backlight

5.

s

Temperature Adjustment

6.

Icon

Intended use

A/AF modes

F mode

Comfort 
(when at home)

70 °F (21 °C)

82 °F (28 °C)

Economy 
(when asleep or away from home)

63 °F (17 °C)

68 °F (20 °C)

Vacation 
(during prolonged absence) 

50 °F (10 °C)

50 °F (10 °C)

User Guide

Programmable Thermostats

120-VAC Models: 500650-120CS, -120B, -120BH, and -120BW 
240-VAC Models: 500650-240CS and -240B

400-115-015-D (Watts Radiant FloorStat TH115_A-F-AF) ENG.fm  Page 1  Wednesday, December 20, 2006  1:44 PM

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