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INSTALLATION
If the thermostat is used with unit heaters, the following sug-
gestions may help. (See Fig. 2).
1. Position "A" is good if it is sufficiently close to the unit heater
so that the return air to the heater flows over the thermostat.
2. Position "B" is good if it is not necessary to make frequent
adjustments of the dial setting.
3. Position "C" is all right if it is sufficiently far from the heater
that air flowing over the thermostat is not much above the
average room temperature.
4. In general, position "D" is not advisable because the post
may prevent air from circulating over the thermostat.
WIRING
All wiring should be done in accordance with local and national
electrical codes and ordinances.
Diagram showing a single room thermostat controlling several
steam or hot water unit heaters. Any number of unit heaters can
be operated from one thermostat provided that the sum of the
The diagram below shows a heavy duty line voltage room ther-
mostat controlling an electric heater.
ROOM
THERMOSTAT
ELECTRIC HEATER
Figure 3A
Locked Case - Concealed Dial:
This feature is for the purpose of preventing tampering and un-
authorized adjustments. A special wrench is provided to remove
case for temperature adjustment.
LOCK SCREW
AT BOTTOM
OF CASE
Figure 4
White-Rodgers is a business
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
TYPE
11B09
Figure 3
TO LINE SWITCH
AND POWER SUPPLY
white-rodgers.com
emersonclimate.com
CEILING
POST
D
C
RETURN AIR
motor locked rotor currents or the sum of the full load currents
does not exceed the electrical rating of the thermostat. The
Type 11B09 Reverse-acting Surface Hot Water Control is used
to prevent operation of the fans when the steam is off or when
the water temperature is too low for proper heating.
TYPE
TYPE
11B09
11B09
ROOM
THERMOSTAT
Locked Case - Concealed Dial:
On a fixed differential heating thermostat, turn the dial so that
the fixed indicator points to the temperature at which it is desired
to have the contacts open, thus turning off the heat.
The contacts will then close at a temperature lower than the dial
setting, by the amount of the differential.
!
Disconnect electric power before removing control
from the wall.
FIXED DIFFERENTIAL
2
PARTITION
WALL OR POST
DIRECTLY
UNIT
BEHIND UNIT
B
A
FLOOR
Figure 2
SUPPLY
RETURN
TO LINE SWITCH
AND POWER SUPPLY
CAUTION
FIXED INDICATOR
Figure 5
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