UNI EN 14750-1 : 2006

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Vehicle classification
5 Comfort parameters
6 Exterior conditions
   6.1 Normal exterior operating conditions
   6.2 Extreme exterior operating conditions
7 Performance of the heating and cooling installations
   7.1 Heating
   7.2 Preheating
   7.3 Cooling
   7.4 Precooling
   7.5 Stand by operation
8 Control
   8.1 General
   8.2 Interior temperature setting (Tic)
   8.3 Interior temperature setting (Tic) for vehicles
        without cooling
9 Comfort condition requirements
   9.1 Temperatures in the comfort envelope
        9.1.1 Range of the mean interior temperature (Tim)
               with the respect to the interior temperature
               setting (Tic)
        9.1.2 Range of the interior air temperatures
               measured 1,10 m from the floor
        9.1.3 Range of the interior air temperatures in a
               vertical section
   9.2 Temperatures in the local annexes
        9.2.1 Temperature in the vestibules
        9.2.2 Temperature in the washrooms, WC's, other
               annex areas
   9.3 Relative humidity of air conditioned vehicles
   9.4 Temperatures of the surfaces surrounding the comfort
        envelope of a stationary vehicle in heating mode
        9.4.1 Walls and ceilings
        9.4.2 Windows and doors
        9.4.3 Minimum surface temperatures
   9.5 Temperature at the supply air outlets and surface
        temperature at active heating element grille
   9.6 Air speed
   9.7 Air quantities
        9.7.1 Outside air or fresh air
        9.7.2 Recirculated air
        9.7.3 Local annex ventilation
10 Complementary requirements
   10.1 Heat transfer coefficient (k)
        10.1.1 General
        10.1.2 Coefficient k of the vehicle
        10.1.3 Coefficient k for vestibules
   10.2 Door opening/closing cycles
   10.3 Overall transmission factor of the windows
   10.4 Particle air filtration
   10.5 Noise emission
   10.6 Vibration generation
   10.7 Safety devices
        10.7.1 Heating
        10.7.2 Cooling
        10.7.3 Emergency ventilation
   10.8 Sealing against water, snow and dust
   10.9 Reliability, maintainability
        10.9.1 Reliability
        10.9.2 Maintainability
Annex A (normative) Regulation curves for the interior
        temperature setting
Annex B (normative) Acceptable air speed
Annex C (normative) Relative humidity in the comfort
        envelope
Annex D (normative) Heat emitted by a seated person
        dressed normally
Annex E (normative) Definition of climatic zones
Annex F (informative) Grouping of countries in climatic
        zones
Annex G (normative) Fresh air flow rate
   G.1 General
   G.2 Air conditioned vehicles
        G.2.1 Category A
        G.2.2 Category B
   G.3 Heated/ventilated vehicles

The standard is applicable to suburban and/or regional vehicles and also metro and tramway vehicles equipped with cooling and/or heating/ventilation systems.