THERMOSTATS
for Radiant Heating
APPLICATION
Wirsbo Thermostats are the first digital thermostats
designed specifically for use
in hydronic radiant heating applications.
Wirsbo provides 2 models of thermostats;
A3030101 — Heat only
A3030102 — Heat/Cool
DEFINITION
The Wirsbo Thermostats are parasitic, or power-
stealing thermostats. They are designed to operate in
heating mode over two-wires.
The thermostat gets its power for operation from
"stealing" voltage off of the connected wiring. This
eliminates any need for a third wire or batteries,
which makes it simple to install, wire and service.
SPECIFICATIONS
• Operating Voltage
24VAC+/-10%
• Maximum Load
1.3A @ 24VAC
(4 MVAs, p/n A3020522)
(6 TVAs, p/n A3010522)
• Display Range
32 to 99°F (0 to 37°C)
• Setpoint Range
40 to 99°F (4 to 37°C)
• Resolution
1° Displayed
0.25° Calculated
• Temperature Ranges
14 to 158°F, Shipping
(-10 to 70°C)
32 to 104°F, Ambient
(0 to 40°C)
• Humidity
40-90% non-condensing
• Size
5.0"H x 2.72"W x 0.91"D
• Weight
0.22 lbs.
TOOLS REQUIRED
• Small, flat heat screwdriver
• Phillips screwdriver (mounting hardware)
• Wire cutter/stripper
INSTALLATION
Prior to installing a Wirsbo Thermostat:
a. Familiarize yourself with the product by
reading the instructions. Failure to do so could
result in damage to this product, yourself or create
a potentially hazardous situation.
b. Make sure that the function and rating of this
product are suitable for the intended use.
c. The installer must be an experienced, trained
professional familiar with low voltage wiring
d. Wirsbo recommends using 18AWG wiring for all
low voltage wiring connections.
LOCATION
Thermostat placement is extremely important. Install
Wirsbo Thermostats approximately
5 (five) feet above the floor on a smooth, flat surface.
Avoid mounting the thermostat in
the following locations:
• Near or around windows
• On outside walls
• Near fireplaces
• In the corner of a room
• Behind doors
• On interior walls susceptible to solar gains
• Near stoves, lamps, televisions, etc.
• Damp areas
Typical Wiring Schematic
NOTE: The Wirsbo Thermostats are designed
and tested to work effortlessly with other
Wirsbo Components. Some commonly used
third party control devices (relays, zone
valves, etc.) have compatibility issues with
power stealing thermostats in general. If the
Wirsbo Thermostat is connected to a third
party control device, please refer to the third
party device operation and installation
manual for specific instructions for
installation with power stealing thermostats.
For the most common applications, please
review the schematics in this document. For
additional help, please call our tech
department @ 888-594-7726.
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