Watts Floorstat 500650-120cs User manual

500650 400-115-015-D 20/12/06 1/2

Watts Radiant’s 500650 programmable thermostats have three tem-

perature control modes:

1Place 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.

2If 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.

3The 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.

4GFI 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.

nRefer to the installation

instructions of the power

base.

oInsert the tabs at the top of

the control module in the slots

at the top of the power base.

pSecure the control module

using the captive screw

underneath the base.

NOTE

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

nPress the Hour button to set the hour.

oSet the Min button to set the minutes.

pSet the Day button to set the day.

qPress 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.

nPress the Day button (3 seconds) until DLS appears

on the screen.

oPress the to toggle between On (enabled) and Off

(disabled).

pPress the Day button briefly. The year setting is dis-

played.

qPress the to set the current year.

rPress the Day button briefly. The month setting is dis-

played.

sPress the to set the current month.

tPress the Day button briefly. The date setting is dis-

played.

uPress the to set the current date.

vPress 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:

nSet the desired temperature using the buttons.

oPress and hold the corresponding button until the corresponding

icon is displayed.

nDescription 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%

oConfiguration 2.

# Configurations UP DN

1 Display format °F / 12 h °C / 24 h

2Early 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

3Temperature 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

pInstallation 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

qClock and Day Setting 4.

rBacklight 5.

sTemperature 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

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 rec-

ommendations 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 fol-

lows:

nSwitch the thermostat to Standby.

oPress and hold the button.

pSwitch the thermostat back to On.

qRelease the button when the minimum temperature

limit (FL:LO) appears.

rSet the minimum temperature limit using the

buttons.

sPress the button to display the maximum

temperature limit (FL:HI).

tSet the maximum temperature limit using the buttons.

uPress Mode/Ret to exit.

The thermostat has 3 modes of operation.

7.1 Automatic Mode

The thermostat follows the programmed schedule. To place the ther-

mostat 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 tempera-

ture will be used until the beginning of the next period. flashes dur-

ing the bypass. You can cancel the bypass by pressing Mode/Ret.

Programmed Schedule

The schedule consists of 4 periods per day which represents a typi-

cal 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:

nPress Pgm to access the programming mode. Period 1 is

selected.

oPress Day to select the day to program (hold for 3 seconds to

select the entire week).

pPress Hour and Min to set the start time of the selected period,

or press Clear if you want to skip the period (--:-- is displayed).

qPress Pgm to select another period, or press Day to select

another day. Then repeat step 3.

rPress 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:

nPress Mode/Ret until is displayed.

oSet 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 defec-

tive 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 reinstal-

lation.

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.

tModes 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