Operating instructions

Checking the diaphragm expansion vessel and system pres-

sure

Note

Carry out this test on a cold system.

1. Drain the system, or close the cap

valve on the diaphragm expansion

vessel and reduce the pressure,

until the pressure gauge indicates

"0".

2. If the inlet pressure of the dia-

phragm expansion vessel is lower

than the static system pressure,

top up with nitrogen until the inlet

pressure is raised by 0.1 to 0.2 bar.

3. Top up your heating system with

water and vent until the filling pres-

sure of a cooled system is 0.1 to

0.2 bar higher than the inlet pres-

sure of the diaphragm expansion

vessel.

Permiss. operating pressure: 3 bar

Checking all gas equipment for tightness at operating pres-

sure

Danger

Escaping gas leads to a risk of

explosion.

Check gas equipment for tight-

ness.

Flue gas emissions test

The electronic combustion control unit automatically ensures an optimum com-

bustion quality. Only the combustion values need to be checked during commis-

sioning and maintenance. For this, check the CO

2 or O2 content. For a function

description of the electronic combustion control unit, see page 105.

2 or O2 content

The CO

2 content must be within the following ranges (upper and lower output):

7.7 to 9.2% for natural gas E and LL

9.3 to 10.9% for LPG P

For all gas types, the O

2 content must be between 4.4% and 6.9%.

If the actual CO

2 or O2 values lie outside their respective ranges, check the

balanced flue system for tightness.

Further details regarding the individual steps (cont.)

Commissioning, inspection, maintenance

5692 672 GB