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PART NO. 37-6756A
0610
INSTALLATION INSTRUCTIONS
1G66 and 150
ELECTRIC-HEAT THERMOSTAT
(Double Line Disconnect)
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.
DESCRIPTION
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY
AND/OR PROPERTY DAMAGE.
SPECIFICATIONS
PRECAUTIONS
80
70
60
50
40
OFF
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.
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.
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.
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
CAUTION
!
WARNING
!
White-Rodgers is a division
of Emerson Electric Co.
www.white-rodgers.com
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