White Rodgers 1G66, 150 User Manual
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY
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.
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.)
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.
NOTE: Only one side of line is broken during normal cycling of
this thermostat.
1G66 and 150
ELECTRIC-HEAT THERMOSTAT
(Double Line Disconnect)
INSTALLATION INSTRUCTIONS
50
60
40
OFF
This Thermostat includes:
Wall cover plate (required when thermostat will not hide
wall imperfections behind old thermostat)
Two cover mounting screws
Three Temperature Limiting Pins
70
80
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.
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.
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
WARNING
!
Do not use on circuits exceeding specified voltages.
Higher voltages will damage control and could cause
shock or fire hazard.
Do not use on inductive loads. Inductive (motor) loads
will damage control and could cause shock, fire hazard
or failure of thermostat.
Temperature Range: 40° to 80°F
Differential: 3.0°F
Switch Action: Open on rise
Contact Structure: Double Line Disconnect - DPST
White-Rodgers is a division
of Emerson Electric Co.
www.white-rodgers.com
PART NO. 37-6756A
0610
INSTALLATION
If the heating equipment manufacturer has made provisions or
recommendations for the location of this control, then follow
those instructions. If not, the following suggestions should be
observed.
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.
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.
CAUTION
!
USE WITH COPPER CONDUCTORS ONLY. Use approved wire connectors for 12 AWG only.
1. Disconnect electrical power to the system at main fuse or
circuit box.
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.
4. Remove thermostat cover. Push thermostat case into
junction box and secure with screws provided.
Take care not to push or damage the bimetal sensing
element during installation.
5. Install thermostat cover and turn knob to desired setting.
1G66 Schematic Diagram
HOT (L1)
POWER IN
BLK
RED
COMMON (L2)
BLK
TO LOAD
RED
SWITCH OPENS
IN "OFF" POSITION
3. It should be mounted as far as possible from undesirable
sources of heat and cold such as:
a. Windows and doors
b. Direct rays from sun
c. Hot water or cold water pipes
d. Adjoining outside walls
240/277 VAC Wiring Diagram
RED
RED
POWER
IN
BLK
L2
L1
LOAD
LO
AD
BLK
LIMIT
CONTROL
HEATER
120 VAC Wiring Diagram
HOT
POWER IN
120 VAC ONLY
COMMON
BLK
RED
L2
L1
RED
LOAD
BLK
LO
AD
LIMIT
CONTROL
HEATER
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:
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.
3. After pressing pins into place on inside of cover, rotate
temperature knob to be sure the knob is between the pins.
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.
Inside of cover
Pins are shown installed at
60 and 65˚. The temperature
setting range is limited
between these two
temperatures.
The third pin is supplied as a
spare in case of accidental
loss.
2
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