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Happy Memorial Day! We will be closed Monday May 28, 2018. Orders printed on Friday May 25th, 2018 will be delivered on Tuesday May 29th, 2018.

TopTech - TT-P-421 5-2 Day Programmable Thermostat 2 Heat/1 Cool

Item: TT-P-421
MFR: TT-P-421
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About This Product

Product Info


TopTech Programmable Thermostat Multi-Stage 2 Heat/1 Cool Conventional and Heat Pump.

Compatibility with low voltage multi-stage gas, oil or electric heating or cooling systems, including multi-stage heat pumps.

•Dual Powered - Hardwired or Battery
•5-2 Day Separate Weekday / Weekend Programming
•Large Display with Bright Blue Backlight
•Adjustable Temperature Set Point Limits
•Non-Volatile Memory Retains User Settings
•Filter Check Monitor
•Adaptive Recovery Mode (ARM™)
•Adjustable 1st and 2nd Stage Temperature Differential
•ESD Guard™ Electronic Circuitry
•Compressor Short Cycle Protection
•Separate Heating and Cooling Set Point Program
Times and Temperatures
•Temporary Program Override for 4 Hours
or Until Next Set Point
•Programmable Extended Hold Mode
•Front Access Reset Button
•F° / C° Switch
•Auxiliary Heat Status Indicator
•Mount to Horizontal Box
•Easy Access Front Battery Door
•Separate O & B Terminals
•Meets California Title 24 Guidelines


Weight0.45 Pounds (lbs)
Width3.81 Inches (In)
Height1.56 Inches (In)
Country of OriginCHN
Hazardous MaterialNo
EPA Cert RequiredNo
Length5.63 Inches (In)
750mV CompatibleYes
Accuracy+/- 1° F (+/- .5° C)
Ambient Temperature Range14°F to 140°F (-10°C to 60°C)
ApplicationResidential / Light Commercial
ApprovalsNone Specified
Auto ChangeoverNo
Batteries IncludedYes
Battery BackupYes
Built In Wi-FiNo
Change/Check RemindersYes
Daylight Savings Time ReadyNo
Differential Temperature1st Stage - 0.5° F (0.25° C), 2nd Stage - 2° F (1.0° C)
Digital-Non ProgrammableNo
Display OptionsNone
Displays Outdoor TemperatureNo
Dual Transformer CompatibleNo
Electrical ConnectionScrew Terminals
Electrical Rating24 VAC
Energy Star RatedNo
Fan SwitchingYes
Heat Pump CompatibleYes
Indoor Remote SensorNo
Low Battery IndicatorYes
Operating Temperature Range40°F to 99°F (4.4°C to 37.2°C)
Power MethodDual Powered: Battery or Hardwired
Programmable FanNo
Removable InterfaceYes
Sensing ElementYes
Stages Cool1
Stages Heat2
Switch ActionSlide Switch
System SwitchingYes
Temperature Range45°F to 90°F (7.2°C to 32.2°C)
Temperature Settings per Day4
Terminal DesignationsR, O, B, Y1, E/W1, G, W2, C
UsesTemperature Control
Vacation ModeYes
Voltage24 VAC
Warranty OfferedYes


Equipment Part List

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