RS PRO 908WHB-3, Installation And Operation Instructions Manual, Page: 1 / 8

1
908WHB-3/B is a programmable thermostat designed for water boiler and electric furnace
application. This thermostat can be used for hot water radiant heating and electric cable heating
system.
SPECIFICATION:
Power source …………………… 2 AA size 1.5V alkaline battery
Maximum resistive load……………… 230VAC 5A
Maximum inductive load………………230VAC 2A
Relay contact …………………………230VAC 8A
Room temperature setting range………5
℃
to 35
℃
(41
℉
to 95
℉
)
Accuracy…………………………….
±
1
℉ or ±
0.5
℃
Dimensions………………………… 115mm
×
90mm
×
16mm
Color……………………………….. White
FEATURE:
z
Large LCD display
z
The screen displays the set temperature and the room temperature also time simultaneously
z
Permanent user setting and program setting retention during power loss,
z
Optional temperature display of Celsius or Fahrenheit scale
z
Both Vacation mold and hold duration mode available for comfort and energy saving
z
Separate 5-day (weekday) and 1-day/1-day (Saturday/Sunday programming with four separate
time/temperature periods per day.
z
Display temperature recalibrates
z
Anti-freezing protection
z
Pump protection available
IMPORTANT SAFETY INFORMATION:
z
Always turn off power at the main power source by unscrewing fuse or switching circuit
breaker to the off position before installing, removing, cleaning, or servicing this thermostat.
z
Read all of the information in this manual before installing this thermostat.
z
Only a professional contractor should install this thermostat.
z
All wiring must conform to local and national building and electrical codes and ordinances.
z
This thermostat has a removable fuse to protect the system from damage. If system is not
operating properly, check wiring and replace fuse if necessary.
z
Use this thermostat only as described in this manual.
KEYBOARD, DISPLAY AND SWITCH DESCRIOPTION
SAS908WHB-3/B Thermostat for Radiant heating
Installation and operation instructions