Radiant Thermostats #A3030101, #A3030102, #A3030103, by Wirsbo - Uponor

When it comes to radiant heating systems, not just any thermostat will do. That’s why professional installers choose Wirsbo Radiant Thermostats. They are the first thermostats designed specifically for radiant floor heating.

Why a special thermostat for radiant floor heating? The dynamics of a radiant heating system differ from typical baseboard or warm air heating systems. Radiant systems always heat objects and mass, and need to be addressed differently than conventional thermostat logic.

The Wirsbo Thermostats offer two different control methods to handle this condition: Differential and Pulse Width Modulation (PWM).

• Differential Mode:
  • When the room temperature falls 1°F (0.5°C) below the desired room setting, the control devices wired to the thermostat activate.
• Pulse Width Modulation (PWM) Mode:
  • When the room temperature is 1 to 3°F (0.5 to 1.5°C) below the desired room setting, the thermostat manages the application of heat by varying the on-and-off cycles (PWM). The on-and-off times vary depending on the difference between room and desired temperatures — the further away, the greater the on time. This prevents the room temperature from rising above the desired temperature. The heating system will run continuously at temperature differences greater than 3°F (1.5°C).

These thermostats also feature Digital Filtering. This means that the thermostat measure the room temperature continuously. The thermostat's sensor detects even the smallest change, making it better able to react to a room's changing conditions. If all the room's temperatures were displayed as they are sensed, the temperatures shown would appear erratic and inconsistent. Filtering works by averaging the sensed values to ensure a smooth operation and display.

Wirsbo offers three thermostat models: Heat Only (A3030101), Heat and Cool (A3030102) and Heat Only, Three-wire (A3030103). The Heat Only (A3030101) and Heat and Cool (A3030102) thermostats are designed to operate in heating mode over two wires. These types of thermostats obtain their power for operation from taking voltage from the connected wiring. Different from other industry power-sharing thermostats, these eliminate any need for a third wire or battery, which makes the thermostats simple to install, wire and service.

And for those times when the two-wire thermostats aren’t appropriate because of incompatibility with some third-party devices, Wirsbo also offers the Heat Only, Three-wire (A3030103).

No matter which thermostat you use, when you're selling radiant, you're selling comfort, The Wirsbo Radiant Thermostats feature special built-in software that provides the ultimate control that standard thermostats--when used with radiant heat--simply cannot. There's no overshoot, no undershoot--just constant, even comfort. Your customers will love the distinctive design and easy-on-the-eyes readout. But most of all, they'll love the true radiant comfort only with Wirsbo Radiant Thermostats can help enhance.

As stated before, Uponor offers the following radiant thermostat models:

• Heat-only (A3030101)
• Heat and Cool (A3030102)
• Heat-only, Three-wire (A3030103)

Radiant Thermostats #A3030101, #A3030102, #A3030103 Specifications

• Operating Voltage ----- 24VAC +/- 10%
• Maximum Load:
  • 1.3 Amps at 24VAC (W terminal)
  • 4 x MVA (part number A3020522)
  • 6 x TVA (part number A3010522)
• Maximum Cooling Load (Heat and Cool model only) ----- 1.0 Amps at 24VAC (Y and G terminals)
• Display Range ----- 38°F to 99°F (2°C to 37°C)
• Setting Range:
  • 38°F to 99°F (2°C to 37°C)
  • 68°F (20°C) default setting
• Minimum Limit:
  • 38°F (2°C) to maximum limit
  • 50°F (10°C) default minimum setting
• Maximum Limit:
  • Minimum limit to 99°F (37°C)
  • 86°F (30°C) default maximum setting
• Units ----- User-configurable Fahrenheit or Celsius
• Memory ----- Permanent settings and mode without power
• Operating Modes ----- Off, heat, cool and fan (on equipped models)
• Freeze Protection:
  • Activation at 38°F (3.3°C)
  • De-activation at 39°F (3.8°C)
• Over-heat Protection (Heat and Cool model only):
  • Activation at 100.4°F (38°C)
  • De-activation at 98.6°F (37°C)
• Resolution ----- 1° displayed, 0.25° calculated
• Temperature Ranges:
  • Shipping and storage — 14°F to 158°F, (-10°C to 70°C)
  • Operation — 32°F to 104°F, (0°C to 40°C)
• Humidity ----- 20 to 90% non-condensing
• Size ----- 5" H x 2.72" W x 0.91" D

Uponor's high-quality and durable radiant thermostats are designed specifically for hydronic radiant heating applications.

Additional Documentation:

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