White Rodgers 150 Thermostat User Manual

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1G66 and 150  
ELECTRIC-HEAT THERMOSTAT  
(Double Line Disconnect)  
INSTALLATION INSTRUCTIONS  
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE  
INSTALLINGOROPERATINGTHISCONTROLCOULDCAUSEPERSONALINJURY  
AND/OR PROPERTY DAMAGE.  
DESCRIPTION  
The Type 1G66 Electric Heat Thermostat is designed for use on  
all types of electrical heating installations such as cable heat,  
baseboards, wall insert heaters, etc.  
50  
60  
40  
70  
The Type 1G66 thermostat is intended for use on 240 or 277  
VAC where local codes require that a double line disconnect  
thermostat be used. This thermostat can also be used on 120  
VAC. (See specific wiring information for 120 VAC.)  
OFF  
80  
Dial Setting: This thermostat may be set anywhere between  
40° and 80°F by simply turning the knob so the indicator on  
knob points to the desired setting.  
The knob may be turned past 40° to the “OFF” position to  
obtain temporary shutdown of the heating equipment for short  
periods of time such as on weekends, vacation, etc. Turning  
knob to “OFF” position will break both sides of line.  
This Thermostat includes:  
NOTE: Only one side of line is broken during normal cycling of  
this thermostat.  
Wall cover plate (required when thermostat will not hide  
wall imperfections behind old thermostat)  
Two cover mounting screws  
Three Temperature Limiting Pins  
PRECAUTIONS  
This control is a precision instrument, and should be handled  
carefully. Rough handling or distorting components could cause  
the control to malfunction. Take care not to push or damage  
the internal bimetal sensing element during installation.  
WARNING  
!
Do not use on circuits exceeding specified voltages.  
Higher voltages will damage control and could cause  
shock or fire hazard.  
CAUTION  
To prevent electrical shock and/or equipment damage,  
disconnect electric power to system, at main fuse or  
circuit breaker box, until installation is complete.  
!
Do not use on inductive loads. Inductive (motor) loads  
will damage control and could cause shock, fire hazard  
or failure of thermostat.  
All wiring must conform to local and national electrical codes  
and ordinances.  
SPECIFICATIONS  
Switch Rating: Non-Inductive  
22A (5000W) 240VAC  
19A (5000W) 277VAC  
22A (2500W) 120VAC  
Temperature Range: 40° to 80°F  
Differential: 3.0°F  
Switch Action: Open on rise  
Contact Structure: Double Line Disconnect - DPST  
PART NO. 37-6756A  
White-Rodgers is a division  
of Emerson Electric Co.  
0610  
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INSTALLATION  
If the heating equipment manufacturer has made provisions or 3. It should be mounted as far as possible from undesirable  
recommendations for the location of this control, then follow  
those instructions. If not, the following suggestions should be  
observed.  
sources of heat and cold such as:  
a. Windows and doors  
b. Direct rays from sun  
1. The control should be mounted in the wall, approximately  
five feet from the floor, as near as possible to the center of  
the controlled area.  
c. Hot water or cold water pipes  
d. Adjoining outside walls  
2. It should be mounted on a partitioning wall, not on an  
outside wall.  
WIRING  
All wiring must conform to local and national electrical codes and ordinances.  
The thermostat may be mounted in any standard 2" x 3"  
electrical outlet box. For ease of installation use a deep type  
box.  
240/277 VAC Wiring Diagram  
RED  
RED  
CAUTION  
USE WITH COPPER CONDUCTORS ONLY. Use ap-  
!
L2  
LIMIT  
CONTROL  
proved wire connectors for 12 AWG only.  
LOAD  
POWER  
IN  
1. Disconnect electrical power to the system at main fuse or  
circuit box.  
HEATER  
L1  
BLK  
BLK  
2. Make electrical connection to thermostat leads with wire  
nuts or other local code approved devices. All connections  
must be tight.  
3. Push the lead wires into the outlet box.  
120 VAC Wiring Diagram  
4. Remove thermostat cover. Push thermostat case into  
junction box and secure with screws provided.  
RED  
RED  
Take care not to push or damage the bimetal sensing  
element during installation.  
L2  
5. Install thermostat cover and turn knob to desired setting.  
LIMIT  
CONTROL  
BLK  
1G66 Schematic Diagram  
LOAD  
HOT (L1)  
HEATER  
HOT  
BLK  
BLK  
L1  
BLK  
TO LOAD  
POWER IN  
POWER IN  
120 VAC ONLY  
RED  
RED  
COMMON (L2)  
COMMON  
SWITCH OPENS  
IN "OFF" POSITION  
Temperature Limiting Pins  
Temperature Limiting Option is for applications where the  
temperature setting of the control is to be set and "protected"  
from unauthorized adjustment. To limit the temperature range,  
follow the directions below:  
Inside of cover  
1. Remove cover from thermostat.  
2. On inside of cover, firmly press small tapered end of a pin  
into the approximate maximum and minimum temperature  
positions.  
Pins are shown installed at  
60 and 65˚. The temperature  
setting range is limited  
between these two  
3. After pressing pins into place on inside of cover, rotate  
temperature knob to be sure the knob is between the pins.  
temperatures.  
The third pin is supplied as a  
spare in case of accidental  
loss.  
4. Replace cover on thermostat. Check that knob rotation is  
limited in travel as set by the pins. If rotation of knob is  
outside of limits, check that the pins are installed properly.  
5. Install supplied screws at top and bottom of thermostat to  
secure cover.  
2

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