EN 834-2013 pdf download.Heat cost allocators for the determination of the consumption of room heating radiators – Appliances with electrical energy supply.
the intended resulting rating factors, the test for compliance with the display deviation limits is done on the basis of the displayed reading values after their normalization to the lowest value of the resulting rating factors used.
The limits of the relative display deviation given in 6.11 shall not be exceeded by any of the test specimens.
11.5 Ageing resistance test
Five operative appliances with known counting rate characteristic are subjected to ageing by exposing them to 300 temperature cycles of a maximum duration of 100 mm. each. Ageing can be performed:
a) in a heat chamber
A temperature cycle is generated by slowly heating the heat cost allocators, over a maximum of 45 mm.,
up to a temperature of [0,8 x (: —20 DC) + 20 DC] ± 2 K and then by cooling to (25 ±2) DC.
b) on an electrically heated, oil-filled radiator
In this case, the heat cost allocators are fitted at the installation height specified by the applicant. A temperature cycle is generated by slowly heating the radiator, over a maximum period of 45 mm., to a surface temperature at the installation position of the heat cost allocators corresponding to the temperature : (see 3.18) ± 2 K and then by cooling to (25 ± 2) °C.
For appliances with radiator sensors which are located separately from the calculator, the temperature sensors are heated up to the temperature of , ± 2 K during the temperature cycles.
Appliance components (central processing units, calculators, etc.) wfilch are not mounted on the radiator are heated in the heating chamber to an appliance temperature of (50 ± 2) °C and then cooled to (25 ± 2) GC.
In the subsequent test carried out in accordance with 11.4 at one of the specified temperature points, the display deviation limits given in 6.11 shall not exceed twice their value after ageing has been completed. If the display deviations caused by the ageing process are not systematic (e.g. drift not in the same direction), the test specimens are subjected to a further 300 temperature cycles, after which the test is repeated.
11.6 Test of the start of counting at normal operation and also, for heat cost allocators with room temperature sensors, at operation with thermal Impact
The test of the start of counting is carried out at the mass flow rate of the base condition. Five heat cost allocators of each type shall be tested simultaneously on one radiator. The attachment point and the installation instructions supplied by the applicant shall be adhered to. The test shall be carried out on a radiator with good thermal contact (vertical profile panel radiator) and on a radiator with poor thermal contact (single-sensor c-value  0,25). For heat cost allocators without room temperature sensors, the test is carried out on both radiators in a series of tests exclusively at normal operation. For heat cost allocators with room temperature sensor, the test is carried out on both radiators in two series of tests each. In the first series, compliance with the requirement of 6.3 is checked with the heat cost allocators at normal operation. In the second series, compliance with the requirement of 6.3 is checked under thermal impact In combination with the increased excess start temperature in accordance with 6.15 for a radiator with good thermal contact. Thermal impact is induced by covering each heat cost allocator with a hood consisting of foamed PUR (thermal conductrvity approximately 0,025 W/(m – K)J with a wall thickness of (25 — 30) mm.
Each test series starts at a radiator operating state below the start temperature or excess start temperature to be tested (start-up criterion) at which none of the installed heat cost allocators is counting. Then the heating medium temperature Is increased in increments of (0.5 to 1) K and the start-up of the heat cost allocator is monitored. The test is considered to be passed if all Installed heat cost allocators of one test series count when the start-up criterion ± 1 K is reached.
For appliances which, at normal operation, can be used for both the single-sensor and the two-sensor measurement method, the complete test programme shall be run for both measurement methods,
11.7 Test of the Idle counting rate
For each type of heat cost allocator, five specimens shall be tested at identical test conditions. The heat cost allocators are placed in a heat chamber and subjected to a room temperature of 27 °C. The idle counting rate is determined from the progression of the displayed reading and the test duration.
The scheduled counting rate is determined, with c = 0, from the scheduled counting rate characteristic for the heating medium temperature m = 80 °C (single-sensor measurement method) or for the heating medium excess temperature As = 60 K (two-sensor measurement method).
The test for compliance with the requirement of 6.4 is considered to be passed if, for all heat cost allocators of one test series, the measured idle counting rate is within 1 % of the calculated scheduled counting rate.
11.8 Test of the counting rate in the case of thermal impact
The test for compliance with the requirements of 6.14 and 6.15 is performed under the test conditions defined in 6.14. Four specimens shall be tested for each type of heat cost allocator. The scheduled counting rate characteristic of the types to be tested shall be known. The temperatures of the front surfaces of the heat cost allocators or of the casings of separately located room sensors shall be measured. Of the tested appliances, two appliances each are subjected to thermal impact. For appliances with room sensors inside the casing (compact version), the thermal impact is induced by covering each heat cost allocator with a hood consisting of foamed PUR (thermal conductivity approximately 0,025 W/(m . K)] with a wall thickness of 25 mm to 30 mm. For sensors which are located separately from the appliance, the thermal impact is created by external heat supply. The covering or heat supply shall bring about a temperature increase of the front surface of at least 15 K. The counting rate Rlhh of the thermally Impacted and R of the non-impacted heat cost allocators is determined from the progression of the displayed reading and the test duration. In addition, the heating medium excess temperature shall be measured.EN 834-2013 pdf download.

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