White Rodgers TYPE 152 installation instructions Wiring

INSTALLATION

If the thermostat is used with unit heaters, the following			CEILING
suggestions may help. (See Fig. 2).			POST
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		UNIT
	thermostat.
2.	Position “B” is good if it is not necessary to make		B
	frequent adjustments of the dial setting.
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.
4.	In general, position “D” is not advisable because the		FLOOR
	post may prevent air from circulating over the thermo-

stat. Figure 2

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 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.

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