Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:10:p12
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 10 (pt 12/30)
Character Range: 553693–556606

7.

  (f)         Appendix 2 is amended as follows:

       (i)      Section 3 is replaced by the following:

        '3.  EMISSIONS TEST RUN

              At the manufacturers request, a dummy test may be run for conditioning of the engine and exhaust system before the measure- ment cycle.

              NG and LPG fuelled engines shall be run-in using the ETC test. The engine shall be run over a minimum of two ETC cycles and until the CO emission measured over one ETC cycle does not exceed by more than 10 % the CO emission measured over the pre- vious ETC cycle.

        3.1.  Preparation of the sampling filters (if applicable)

              At least one hour before the test, each filter shall be placed in a partially covered petri dish, which is protected against dust con- tamination, and placed in a weighing chamber for stabilisation. At the end of the stabilisation period, each filter shall be weighed and the tare weight shall be recorded. The filter shall then be stored in a closed petri dish or sealed filter holder until needed for testing. The filter shall be used within eight hours of its removal from the weighing chamber. The tare weight shall be recorded.

        3.2.  Installation of the measuring equipment

              The instrumentation and sample probes shall be installed as required. The tailpipe shall be connected to the full flow dilution sys- tem, if used.

        3.3.  Starting the dilution system and the engine

              The dilution system and the engine shall be started and warmed up until all temperatures and pressures have stabilised at maxi- mum power according to the recommendation of the manufacturer and good engineering practice.

        3.4.  Starting the particulate sampling system (diesel engines only)

              The particulate sampling system shall be started and running on by-pass. The particulate background level of the dilution air may be determined by passing dilution air through the particulate filters. If filtered dilution air is used, one measurement may be done prior to or after the test. If the dilution air is not filtered, measurements at the beginning and at the end of the cycle may be done and the values averaged.

              The dilution system and the engine shall be started and warmed up until all temperatures and pressures have stabilised according to the recommendation of the manufacturer and good engineering practice.

              In case of periodic regeneration aftertreatment, the regeneration shall not occur during the warm-up of the engine.

        3.5.  Adjustment of the dilution system

              The flow rates of the dilution system (full flow or partial flow) shall be set to eliminate water condensation in the system, and to obtain a maximum filter face temperature of 325 K (52 °C) or less (see section 2.3.1 of Annex V, DT).

        3.6.  Checking the analysers

         The