Purpose of control: Automatic electrical control of modulating thermostat
Protection against electric shock: Independently Mounted Class I Equipment
Rated voltage: 100-240 V~, 50-60 Hz
Surge immunity category: Installation Class 2 or Residential
Pollution degree: 2
Type of action: 1C
Rated loads for relays: 100-240 V~, 50-60 Hz, 3 A resistive or 1 A inductive
Method of earthing: Functional ground terminal
Rated impulse voltage: 4 kV
Temperature for the ball pressure test: 125 ºC for materials in contact with or supporting
live parts; 80 ºC for accessible surfaces
ELV limits of power output to thermostat: 12 V DC, 0.15 A on terminals T1 and T2
Device and function definition
in accordance with EN 60730-1
Energy Related Product (ErP) Directive
Model
Control
Class Definition of Temperature Control Class
Additional seasonal
space heating energy
efficiency gain
Nest Learning Thermostat
*
installed in an On/Off
heating system
IV TPI room thermostat, for use with on/off output heaters: An electronic room
thermostat that controls both thermostat cycle rate and in-cycle on/off ratio
of the heater proportional to room temperature. TPI control strategy reduces
mean water temperature, improves room temperature control accuracy and
enhances system efficiency.
+2%
Nest Learning Thermostat
*
installed in an OpenTherm
heating system
VI Weather compensator and room sensor, for use with modulating heaters:
A heater flow temperature control that varies the flow temperature of water
leaving the heater dependant upon prevailing outside temperature and
selected weather compensation curve. A room temperature sensor monitors
room temperature and adjusts the compensation curve parallel displacement
to improve room comfort. Control is achieved by modulating the output
of the heater.
+4%
Nest Learning Thermostat meets the criteria of the following
temperature control classes under the ErP Directive.
* Model A0001 thermostat used with model A0003 Heat Link
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