Watts FloorStat 500650-240CS, FloorStat 500650-120B, FloorStat 500650-240B, FloorStat 500650-120BH, FloorStat 500650-120BW Owner's Manual

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

2

40-VAC Models: 500650-240CS and -240B

The Watts Radiant 500650 programmable FloorStat will provide both
energy savings and comfort.

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 dam­age 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 af

fect the clock or programming.

1. SWITCH SELECTION

This FloorStat is factory-set to the following default values ( ):

Switch Function UP DN
SW1 Temperature format* °F °C

SW2 Early start

†

Disable Enable

SW3 Time format 12 h 24 h

*

If you switch from °F to °C or vice versa, the , , and setpoints may need
t

o 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 star t time based on the
previous day’s perfor mance.

Switches are located on the rear of the face plate. To modify, switch
UP or DN.

2.

MOUNTING F

ACE 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 scr

ew 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.

F

loor 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
d

isplayed 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-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 until the

heating indicator is displayed.

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, r

eset FloorStat (On/Standby) to power the

heating system.

NOTE: If the warning light comes on during normal operation, cut power
to heating system fr

om the main power panel and have an electrician

verify the installation.

5. TEMPERATURE SETPOINT

The 500650 ther

mostat is pr

ogrammed with the following default

temperature control setpoints:
Symbol Setting Default New

Comfort

(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. Pr

ess

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. T

o activate, pr

ess

Mode/Ret until is displayed. A pr

ogram
icon (e.g., ) and corresponding setpoint (e.g., or ) are also
displayed.

Temporary Bypass — Maintains a specific temperature until the
beginning of the next pr

ogram. Set the desired temperature using the

OR pr

ess or to use a pr

e-defined setpoint.

Manual — Maintains a manually-defined setpoint.

1. To activate, press Mode/Ret until is displayed.

2. Set temperatur

e using OR press or to use Comfort or

Economy setpoint.
Vacation — Maintains the Vacation setpoint when away for a

pr

olonged absence (e.g., a vacation). Can also be done r

emotely

thr

ough 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

7

. DEFAULT SCHEDULE

AUTO MODE ONLY
The 500650 FloorStat is preprogrammed with the following schedule:

Prog Setpoint* MO TU WE TH FR SA SU

8

2°F 6:00a 6:00a 6:00a 6:00a 6:00a 6:00a 6:00a
68°F 8:00a 8:00a 8:00a 8:00a 8:00a 10:00a 10:00a
8

2°F 5:00p 5:00p 5:00p 5:00p 5:00p 5:00p 5:00p
6

8°F 10:00p 10:00p 10:00p 10:00p 10:00p 11:00p 11:00p

*To modify the Comfort and Economy setpoints, see Temperature Setpoint.

This schedule is defined with the following Economy and Comfort
periods:

• Comfort: 6:00a to 8:00a and 5:00p to 10:00p.

• Economy: 8:00a to 5:00p and 10:00p to 6:00a.
The SunTouch 500650 controls the heating system according to the

setpoints defined in the four programs.

N

OTE:To reset the 500650, press and hold , position switch to

Standby then to On. This will completely erase the schedule and any
modified setpoints.

8. MODIFY THE SCHEDULE

•

After 60 seconds of inactivity, the FloorStat will automatically exit
programming mode.

• It is faster to program the same schedule for the entire week; then
modify the exception days.

• See Temperature Setpoint for more information on how to modify the
Comfort and Economy setpoints.

• You can program up to 4 different settings for each day of the week.

Prior to making changes, use this blank template to record your
personalized schedule:

P

rog Setpoint MO TU WE TH FR SA SU

___°_
___°_
___°_
_

__°_

Temperature format: o °F o °C
Time format: o 12h o 24h
Notes: __________________________________________________________

________________________________________________________________
________________________________________________________________

To modify, follow these steps:

1. Press PGM to access the programming mode

2. Press Day to select the day to be programmed (hold for 3 seconds

to select all days of the week).

3. Press PGM to select the Program No. (1, 2, 3, or 4).

4. Pr

ess

Hour and Min to set the time OR pr

ess

Clear to clear the

time (--:-- is disregarded).

5. Repeat steps 2 to 4 for remaining programs.

6. When completed, pr

ess

Mode/Ret to exit pr

ogramming mode.
Schedule Example:
This schedule is an example of the various possibilities:

Prog Setpoint

MO TU WE TH FR SA SU

82

°

F

5:00a 5:00a 5:00a 5:00a

5:00a 9:00a 9:00a
68°F 8:00a 8:00a 8:00a 8:00a 8:00a 12:00p 12:00p
82°

F

4:00p 4:00p 4:00p 4:00p 4:00p 8:00p 8:00p

68°

F

9:00p 9:00p 9:00p 9:00p 9:00p 11:00p 11:00p

REMOTE INPUT

The FloorStat is equipped with a remote input which allows connection
of a telephone controller or any other remote control system. When a
signal is received through this input, the FloorStat will automatically
switch fr

om normal operating mode to Vacation mode ( ), or vice

versa. Y

ou can, for example, heat your countr

y house from your office on

Friday

, or your house fr

om the airpor

t, or fr

om your car on your way back

from vacation.

CHARACTERISTICS

This FloorStat works differently than
a conventional electromechanical type.
The latter can have a differential of
temperatur

e up to 7.2°F (4°C) while this

electronic FloorStat has one of only

0.9

°

F (0.5

°

C). This slight oscillation
eliminates the discomfort often found with
conventional electromechanical thermo­stats. The pr

opor

tional contr

oller deter­mines the amount of power required by
the floor heating system to maintain the
desired temperature setting.

100%

80%

60%

40%

20%

To see this process, the display shows, in real time, the percentage of
power applied to the electric heating system.

Percentage (100% = 1 cycle)

CYCLES 20% 40% 60% 80% 100%
15 min. 3 min. 6 min. 9 min. 12 min. 15 min.

Example for FloorStat with 15-minute cycles:
For example, when the screen displays (which equals 40% or 6 min-

utes), then the heating system will be ON for 6 minutes, then OFF for
the remaining 9 minutes of the 15-minute cycle. The heating indicators
refresh when a new cycle starts.

TECHNICAL SPECIFICATIONS

Models (120 VAC): 500650-120CS, -120B, -120BH, and -120BW
Models (240 VAC): 500650-240CS and -240B
Display range: 32°F to 140°F (0°C to 60°C)
Setting range (ambient): 40°F to 86°F (5°C to 30°C)
Setting range (floor temp.): 40°F to 104°F (5°C to 40°C)
Comfort default: 82°F (28°C)
Economy default: 68°F (20°C)
Vacation default: 50°F (10°C)
Floor default temperature limit: 82°F (28°C)
T

emperature variation:±0.9°F (0.5°C)
Storage: –4°F to 120°F (–20°C to 50°C)
Temperature control: Proportional integral adaptive (analyzes the

system’s past cycles to optimize future commands), 15-minute
heating cycles.

MEMORY BACKUP

In the event of a power failure, an internal circuit will maintain the pro­gramming. Only the time will have to be set if the power failure is more
than two (2) hours. The FloorStat will return to the same operating mode
as set before the power failure.

WARRANTY

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 repair or replace the product with a new or of equivalent quality at
Watts Radiant option, without charge, any product proven defective in
normal use.

W

ar

ranty does not cover transpor

tation costs. Nor does it cover a

pr

oduct subjected to misuse or accidental damage. This war

ranty does

not cover the cost of installation, 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 r

esulting
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 exclu

­sions 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 pr

oduct and the original sale r

eceipt must be r

etur

ned to

the original dealer or shipped pre-paid, insured and addressed to:

Watts Radiant, Inc.
4500 E. Pr

ogr

ess 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.

Watts Radiant, Inc. Programmable FloorStat 04/28/2006 920-115-010-00-1-A