• 3-fan speeds - cool, low heat and high heat speeds
• Color coded (labeled) thermostat connection for quick helpful selection
• System diagnostics, with fault recall (stored)
• Cover label displays diagnostic table
• Red LED light - used for diagnostic flash codes
• Low voltage - fuse protection - 3A replaceable automotive type
• Humidifier and electronic air cleaner connections (optional)
• 1-1/2 amp at 25 VAC 50/60 Hz 0.6 pf valve relay, 6 amp at 120 VAC 50/60 Hz (resistive) igniter relay, 2.2 FLA - 3.5 LRA at 120 VAC inducer relay, 14.5 FLA - 25 LRA at 120 VAC circulator relay Sid Harvey Item #:50M56U-843: Replaces Part #:'s : B1809926 | B1809926S |

• Adjustable snap disc thermostat allows you to set the temperature set point to match your specific needs which simplifies inventory
• Reduces inventory while providing coverage for a wide range of temperature applications
• Replaces the majority of fixed disc thermostats now on heating equipment and various appliances
• (2) adjustable fan control models replace 7-fixed snap disc models
• 5 adjustable limit control models replace 10-fixed snap disc models
• 74T12 style and 310709 type therm-o-disc
• Includes thermostat and tab-to-screw terminals

• Adjustable snap disc thermostat allows you to set the temperature setpoint to match your specific needs which simplifies inventory
• Reduces inventory while providing coverage for a wide range of temperature applications
• Replaces the majority of fixed disc thermostats now on heating equipment and various appliances
• 2 adjustable fan control models replace 7 fixed snap disc models
• 5 adjustable limit control models replace 10 fixed snap disc models
• 310708 type Therm-O-Disc
• 14 amp at 120 VAC full load, 72 amp at 120 VAC locked rotor, 25 amp at 120 VAC

• Design eliminates "fluttering" or malfunction due to shock or vibration normally encountered with "sail switches"
• Wide operating range
• Can be mounted in any position except upside down
• Enclosed diaphragm
• Responds to positive, negative or differential air pressure

white rodgers 770-1

• Allows residual cooled air to be blown into the controlled space, increasing the efficiency of the system in cooling
• Depending on electrical hook-up in a heat pump system, delay of blower shut-off could also occur in heating
• Contact rating power pole: 7 amp full load, 36 amp locked rotor, 15 amp resistive, 3/4 HP at 208/240/277 VAC

• Proven reliability in a compact, versatile, cost-effective design
• Provide high-speed contact separation
• OEM replacement for competitive models
• 1/2" bi-metal disc with ranges for your system needs
• 36T type 612718 style Therm-O-Disc
• With gasket

• 1/2" bi-metal disc with ranges for system needs
• Proven reliability in a compact, versatile, cost-effective design
• Provides high-speed contact separation
• OEM replacement for competitive models
• 36T TOD type
• 612701 TOD style