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INSTALLATION
If the thermostat is used with unit heaters, the following
suggestions 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
TYPE
11B09
The diagram at the right shows a heavy duty line voltage
room thermostat controlling an electric heater.
TYPE
11B09
Figure 3
CEILING
POST
C
D
RETURN AIR
FLOOR
Figure 2
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.
ROOM
THERMOSTAT
ROOM
THERMOSTAT
ELECTRIC HEATER
Figure 3A
2
PARTITION
WALL OR POST
DIRECTLY
UNIT
BEHIND UNIT
B
A
SUPPLY
TYPE
11B09
RETURN
TO LINE SWITCH
AND POWER SUPPLY
TO LINE SWITCH
AND POWER SUPPLY
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