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Watts Radiant’s 500650 programmable thermostats have three temperature 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 Savings Time changeover. When this function is enabled (On), the thermostat 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.
FAF
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
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500650 400-115-015-D 20/12/06 2/2
6.3 Floor Temperature Limits (AF mode only)
NOTE: To avoid damaging your floor, follow your floor supplier’s recommendations regarding floor temperature limits.
The minimum and maximum floor temperature limits are 41 °F (5 °C)
and 82 °F (28 °C) by default. To modify these limits, proceed as follows:
n Switch the thermostat to Standby.
o Press and hold the button.
p Switch the thermostat back to On.
q Release the button when the minimum temperature
limit (FL:LO) appears.
r Set the minimum temperature limit using the
buttons.
s Press the button to display the maximum
temperature limit (FL:HI).
t Set the maximum temperature limit using the buttons.
u Press Mode/Ret to exit.
The thermostat has 3 modes of operation.
7.1 Automatic Mode
The thermostat follows the programmed schedule. To place the thermostat in this mode, press Mode/Ret until is displayed. The data of
the current schedule period are also displayed.
Temporary Bypass
If you modify the setpoint temperature (by pressing the , or
button) when the thermostat is in automatic mode, the new temperature will be used until the beginning of the next period. flashes during the bypass. You can cancel the bypass by pressing Mode/Ret.
Programmed Schedule
The schedule consists of 4 periods per day which represents a typical week day. You can program the thermostat to skip the periods
that do not apply to your situation. For example, you can skip periods
2 and 3 for the weekend.
The Comfort ( ) temperature is used in periods 1 and 3 and the
Economy ( ) temperature is used in periods 2 and 4. For example,
when the period changes from 1 to 2, the setpoint automatically
changes from Comfort ( ) temperature to Economy ( ) temperature.
You can have a different program for each day of the week; i.e., each
period can start at different time for each day of the week. The
thermostat has been programmed with the following schedule.
To modify the schedule:
n Press Pgm to access the programming mode. Period 1 is
selected.
o Press Day to select the day to program (hold for 3 seconds to
select the entire week).
p Press Hour and Min to set the start time of the selected period,
or press Clear if you want to skip the period (--:-- is displayed).
q Press Pgm to select another period, or press Day to select
another day. Then repeat step 3.
r Press Mode/Ret to exit the programming mode.
NOTE: If no button is pressed for 60 seconds, the thermostat will
automatically exit the programming mode.
7.2 Manual Mode
The programmed schedule is not used. The temperature must be set
manually. To place the thermostat in this mode:
n Press Mode/Ret until is displayed.
o Set the temperature using the , or button.
7.3 Vacation Mode
In this mode, the thermostat is set to Vacation temperature. There
are two ways to place the thermostat in Vacation mode:
By pressing the button on the thermostat. When the Vacation
mode is activated using the button, the icon appears on the
screen without flashing.
From any remote control device equipped with a dry contact.
When the contact closes, the Vacation mode is activated and the
icon flashes on the screen. All buttons on the thermostat are
locked. When the contact opens, the thermostat returns to the
preceding mode.
NOTE: When the Vacation mode is activated using a remote
control device, it can only be deactivated using the device.
The measured temperature is below the thermostat’s display
range. Heating is activated.
The measured temperature is above the thermostat’s display
range. Heating is deactivated.
Verify the thermostat and sensor connections.
:
Power supply: Refer to the power base’s installation guide.
Display range: 32 °F to 158 °F (0 °C to 70 °C)
Ambient setpoint range (A/AF modes)
: 40 °F - 86 °F (5 °C to 30 °C)
Floor setpoint range (F mode): 40 °F - 104 °F (5 °C to 40 °C)
Floor limit range (AF mode): 40 °F - 104 °F (5 °C to 40 °C)
Display resolution: 1 °F (0.5 °C)
Operating temperature: 32 °F to 120 °F (0 °C to 50 °C)
Storage temperature: -4 °F to 120 °F (-20 °C to 50 °C)
Heating cycle length: Refer to the power base’s installation guide
Data backup: In the event of a power failure, most settings are
saved. Only the time must be re-adjusted if the power failure lasts
more than 6 hours. The thermostat will return to the mode that was
active prior to the power failure.
WATTS RADIANT, INC. ONE (1) YEAR LIMITED WARRANTY
This product is warranted against material defects and workmanship
in normal use for a period of one year, from the date of the original
purchase from authorized dealers. During this period, Watts Radiant,
Inc. will replace the product or refund the original cost of the product
at Watts Radiant option, without charge, any product proven defective in normal use.
This warranty does not cover transportation costs. Nor does it cover
a product subjected to misuse or accidental damage. This warranty
does not cover the cost of installation, diagnosis, removal or reinstallation.
This limited warranty is in lieu of all other warranties, obligations or
liabilities expressed or implied by the company. In no event shall
Watts Radiant, Inc. be liable for consequential or incidental damages
resulting from installation of this product. Some states or provinces
do not allow limitations on how long an implied warranty lasts, or the
exclusion or limitation of incidental or consequential damages, so the
above exclusions or limitations may not apply to you. This warranty
gives you specific legal rights and you may also have other rights
which vary from state to state.
The defective product and the original sale receipt must be returned
to the original dealer.
Watts Radiant, Inc.
4500 E. Progress Place
Springfield, MO 65803-8816
If you have any questions concerning the installation or programming
of this product, please call our technical assistance at 800-276-2419.
t
Modes of Operation
7.
Period Description Associated temperature setting
Wake-up
Away from home
Return home
Sleep
Period Setting
MO TU WE TH FR SA SU
6:00
a.m.
6:00
a.m.
6:00
a.m.
6:00
a.m.
6:00
a.m.
6:00
a.m.
6:00
a.m.
8:30
a.m.
8:30
a.m.
8:30
a.m.
8:30
a.m.
8:30
a.m.
--:-- --:--
5:00
p.m.
5:00
p.m.
5:00
p.m.
5:00
p.m.
5:00
p.m.
--:-- --:--
11: 00
p.m.
11:00
p.m.
11:00
p.m.
11:00
p.m.
11: 00
p.m.
11:00
p.m.
11:00
p.m.
u
Error Messages
8.
v
Technical Specifications
9.
;
Warranty
10.
Customer Assistance
11.
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