INSTALLATION
If the thermostat is used with unit heaters, the following |
| CEILING |
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suggestions may help. (See Fig. 2). |
| POST | ||
1. | Position “A” is good if it is sufficiently close to the unit |
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| heater so that the return air to the heater flows over the |
| UNIT | |
| thermostat. |
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2. | Position “B” is good if it is not necessary to make |
| B | |
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| frequent adjustments of the dial setting. |
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3. | Position “C” is all right if it is sufficiently far from the | D | C | |
| heater that air flowing over the thermostat is not much |
| RETURN AIR | |
| above the average room temperature. |
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4. | In general, position “D” is not advisable because the |
| FLOOR | |
| post may prevent air from circulating over the thermo- |
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stat. | Figure 2 |
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PARTITION
WALL OR POST
DIRECTLY BEHIND
UNIT
A
WIRING
All wiring should be done in accordance with local and national electrical codes and ordinances.
SUPPLY
TYPE | TYPE | TYPE |
11B09 | 11B09 | 11B09 |
RETURN
TO LINE SWITCH
AND POWER SUPPLY
ROOM
THERMOSTAT
Figure 3
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 pro- vided that the sum of the motor locked rotor currents or the sum of the full load currents does not exceed the electrical rating of the thermostat. The Type 11B09
The diagram at the right shows a heavy duty line voltage room thermostat controlling an electric heater.
ROOM
THERMOSTAT
ELECTRIC HEATER
TO LINE SWITCH AND POWER SUPPLY
Figure 3A
2
