Thermostats

ATP21W02

The ATP21W02 Thermostat is a programmable device designed for two-stage heating and one-stage cooling of 24V water-source heat pump systems. It features a 5-day/2-day programming schedule, four periods per day, a temperature display in either Fahrenheit or Celsius, and allows for individual heat and cool setpoints, along with manual changeover and convenient overrides for temporary setpoint adjustments.

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Overview

The ATP21W02 Thermostat is designed for programmable temperature control of 24V water-source heat pump systems, providing two stages of heating and one stage of cooling. It features a 5-day/2-day programming schedule with four periods per day, allowing users to set individual heat and cool setpoints. The thermostat supports both Fahrenheit and Celsius temperature displays and offers manual changeover options. Additional features include zero temperature droop performance, convenient temporary setpoint overrides, and memory retention of setpoints during power outages. Its user-friendly design includes easy installation wiring connections and room temperature offset adjustments.

Features

Standard Features

Programmable 2H 1C thermostat for 24V water-source heat pump equipment.
5-day/2-day programming with four periods per day.
Temperature display options in °F or °C.
Individual heat and cool setpoints.
Zero temperature droop performance.
Manual changeover feature.
Convenient overrides for temporary setpoint changes.
Setpoints are permanently held in memory (if batteries are used).
Room temperature offset adjustment capability.
Back section with wiring connections for easy installation.

Configurable Options

Application: The ATP21W02 Thermostat provides 2 stages heating, 1 stage cooling, and programmable temperature control of 24V water-source heat pump equipment.
Programming schedule includes one schedule for the five weekdays, one schedule for the two weekend days, and four periods per day (5/2/4).
5-day/2-day programming
Four periods per day
°F or °C temperature display
Individual heat and cool setpoints
Zero temperature droop performance
Manual changeover
Convenient overrides allow temporary setpoint changes
Setpoints are permanently held in memory (if batteries are used)
Room temperature offset adjustment
Back section has wiring connections for easy installation

Performance Specifications

Performance specifications not applicable to this product.

Resources

“With our research, ClimateMaster is number one. We don’t have any outside units—you can sit on the back porch without the unit clicking on or the fan running in the summertime. This being my last house, we really checked into geothermal, and it’s been the perfect solution.”

BrentHomeowner

“Now I’ve got a certified home that is 78% more energy efficient than my neighbors and 48% more efficient than new builds on the market today. I’m saving about $1,750 to $1,800 a year, and as a bonus, I get free hot water as a byproduct of my geothermal system. It’s quiet—I can hear my neighbors’ air source heat pumps, but they don’t hear mine.”

ChadResidential Professional & Homeowner

“We have geothermal—our neighbors don’t, and I know they wish they did. It’s a clean heat, not as drying to the skin, and you can feel the difference. In 6.3 years, we’ll recoup our investment, and after that, it’s all savings. Just plain facts—it saves money. ClimateMaster was the right choice: professional, customer-oriented, and easy to work with.”

PamelaHomeowner

ATP21W02

Overview

Features

Standard Features

Configurable Options

Performance Specifications

Resources

Thermostat - ATP21W02 IOM

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