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THERMOSTATS
LINE VOLTAGE
THERMOSTATS
1A65-641
1G65-641
1G66-633
LINE VOLTAGE BASEBOARD THERMOSTATS
Electric Heat Thermostats Used for Controlling Baseboards,Cable
Heat, Glass Panels, etc.
FEATURES
• 1A66 types are a double-pole disconnect model with“OFF” position which
mechanically breaks both sides of line.
• Classic White or Beige color.
SPECIFICATIONS
Dimensions . . . . . . . . . . . 41/2 ”H x 23/4” W x 11/4 ”D
Agency . . . . . . . . . . . . U.L. listed and C.S.A. certified
PARTS AND ACCESSORIES See end of thermostats section for additional parts and accessories
• F75-0176 – for locking or limiting temperatures at 66°, 69°, 72° or 75°F
Temperatures limit can also be set at 60° or 63°
• Thermostat Guards — see pages 34–35
LINE VOLTAGE BIMETAL WALL THERMOSTATS
Electric Heat Thermostats Used for Controlling Baseboards,Cable
Heat, Glass Panels, etc.
FEATURES
• 1G66 types are a double-pole disconnect model with “OFF” position which
mechanically breaks both sides of line.
• Classic white.
SPECIFICATIONS
Dimensions . . . . . . . . . . . 413/16 ”H x 35 /16 ”W x 1 7/18”D
Agency . . . . . . . . . . . . U.L. listed and C.S.A. certified
PARTS AND ACCESSORIES See end of thermostats section for additional parts and accessories
• Thermostat Guards — see pages 34–35
Model
Number Range
Switch
Action Load
Resistive
(Non-Inductive)
1A65-641
40 to 85°F (4 to 29°C) 1.0°F Open on Rise
22.0A, 120 VAC (2500W)
22.0A, 240 VAC (5000W)
18.0A, 277 VAC (5000W) 1A65W-641 
1A66-641
40 to 85°F (4 to 29°C) 1.0°F Open on Rise
22.0A, 240 VAC (5000W)
18.0A, 277 VAC (5000W)
1A66W-641 
➀ W in model number denotes Classic White Color
REPLACES HONEYWELL T498A / B SERIES
Model
Number Range
Switch
Action Load
Resistive
(Non-Inductive)
 1G65-633
4 to 26°C (40 to 80°F) 0.5°C Open on Rise
22.0A, 120 VAC (2500W)
22.0A, 240 VAC (5000W)
18.0A, 277 VAC (5000W)
1G65-641
40 to 80°F (4 to 26°C) 2.0°F Open on Rise
22.0A, 120 VAC (2500W)
22.0A, 240 VAC (5000W)
18.0A, 277 VAC (5000W)
 1G66-633 4 to 26°C (40 to 80°F) 0.5°C Open on Rise 22.0A, 240 VAC (5000W)18.0A, 277 VAC (5000W)
1G66-641 40 to 80°F (4 to 26°C) 2.0°F Open on Rise 22.0A, 240 VAC (5000W)18.0A, 277 VAC (5000W)
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