Systema Eolo 20AE Series - Measuring the Efficiency; Measuring the Temperature of Combustion Air

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Gas airtight suspended warm air heaters - EOLO

SYSTEMA S.p.A.

Rev. 10EE0112

Fig. 32 Hole for taking samples for combustion analysis with

heat recovery systems (point B)

9.3 Measuring the efficiency

Taking a sample of combustions products:

Taking a sample of combustion products and measuring of the temperature of these must be performed

by means of the special through hole in the combustion product discharge duct.

After taking measurements, the operator must close the hole accurately to guarantee the seal of the

combustion product discharge duct during normal operation of the system.

The person in charge of operation and maintenance of the system must have the hole made by a

certified technician or service engineer, unless the heater has already been provided with a specific

hole, or one has remained following other measurements taken in compliance with the instructions

above, in conformance with the standard UNI 10389.

The hole must be located at a distance from the heater outlet equivalent to twice the internal diameter

of the combustion products discharge duct. If there is a bend in the duct inside this distance, the hole

must be located at a distance from the far end of the bend equivalent to one internal diameter of the

combustion products discharge duct.

If the concentration of CO detected in the condition of dry and air-less combustion products is

greater than 0.1% (1000 ppm) and the operator or service engineer cannot reduce it to below

this value, the combustion test must be considered as failed, notwithstanding the measured

value of combustion efficiency.

NOTE

If heat recovery systems are fitted

downstream of the heater, the

hole must be located on the

stretch of the combustion

products discharge duct below

the recover systems; this is the

case for a metal fume duct,

without insulation and located in-

side the room (see fig. 29a), that

provides the room with heat

either through convection and

irradiation.

9.3.2 Measuring the temperature of combustion air

This must be performed in a suitable point of the combustion air supply duct.

After taking measurements, the operator must close the hole accurately to guarantee the seal of the

duct during normal operation of the system.

COMBUSTION

ANALYSER