Viessmann Type B2HA Operations Instructions download pdf (Page 39)

Max. heating output setting

The maximum output for heating oper-

ation can be limited. The limit is set via

the modulation range. The max. adjust-

able heating output is limited upwards by

the boiler coding card.

Weather-compensated control unit Constant temperature control unit

Service menu

1. Press OK and å simultaneously for

approx. 4 s.

2. "Service functions"

3. "Max. output"

4. "Change?" Select "Yes".

A value is shown on the display (e.g.

"85"). In the delivered condition, this

value represents 100 % of rated heat-

ing output.

5. Set the required value.

Service menu

1. Press OK and å simultaneously for

approx. 4 s.

Select "3" with Ú and confirm with

OK.

A value flashes on the display (e.g.

"85") and "

" appears. In the deliv-

ered condition, this value represents

100 % of rated heating output.

3. Select required value and confirm with

OK.

Tightness test for balanced flue system (annular gap check)

Combustion air aperture

For balanced flue systems tested

together with the wall mounted gas fired

boiler, the requirement for a tightness

test during commissioning by the flue

gas inspector is not applicable.

We recommend that your heating engi-

neer carries out a simple leak/tightness

test during the commissioning of your

system. For this, it would be sufficient to

check the CO

or O

concentration in the

combustion air at the annular gap of the

balanced flue pipe.

The flue pipe is deemed to be gas-tight

if the CO

concentration in the combus-

tion air is no higher than 0.2 % or the

concentration is at least 20.6 %.

If actual CO

values are higher or O

val-

ues are lower, then pressure test the flue

pipe with a static pressure of 200 Pa.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5772 909 GB

Service

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Viessmann Type B2HA Operations Instructions Page 39

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