Viessmann ESS CHP Spezifikationen PDF herunterladen (Seite 15)

Subject to changes due to technical improvements ESS Energie Systeme & Service GmbH

CHP accessory range – 01/2010 15

5368 463

3 Gas

3.1 Gas tightness test

Article number CHP module type ESS Viessmann

EM-18/36, EM-50/81, EM-70/115 710-00-0052 7411168

Version Tightness tester, including installation in the gas train or module control panel

Function The gas tightness tester consists of a pressure and monitoring PCB for installation in the gas train of the

CHP module. It is suitable for gas trains with two safety valves and monitors the safety function of the

valves following shutdown. The tester establishes any unacceptable leak in any of the gas valves and

prevents the CHP module from starting up if there is a fault.

According to EN 746-2, a tightness test should be carried out from 1200 kW heating output and above. In

DIN 33831-2 it is recommended from 390 kW and above.

Delivery Integrated into the CHP gas train

3.2 Natural gas knocking monitoring equipment

Article number CHP module type ESS Viessmann

EM-50/81, EM-70/115, EM-140/207 710-00-0050 7417755

EM-238/363 710-00-0051 7411169

Version • For natural gas with a methane count < 75

• With a methane count between 80 and 75, provide output reduction!

• Knocking control tted in the module or module control panel

Function If the methane count of the fuel gas (not to be confused with the methane content!) is below the

permissible level for the engine, after successful ignition the thermodynamic properties of the gas will

cause an additional ignition of the air-gas mixture outside the standard combustion range. This results

in signicantly faster combustion with several ame fronts. Where these ame fronts meet, powerful

pressure waves are created whose sound emissions are heard as knocking noises.

Knocking causes much greater wear and leads to engine damage; it should always be prevented.

For this purpose, the natural gas knocking monitoring equipment is provided, which reliably prevents

knocking sounds as part of the CHP module control. If knocking persists, the output will decrease. If this

measure is not successful either, the engine must be switched off.

Delivery • For EM-50/81, EM-70/115, EM-140/207 in separate control panel

• For EM-238/363 integrated in the CHP module or module control panel

Gas

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Viessmann ESS CHP Spezifikationen Seite 15