Viessmann WB1A Series Installation And Service Instructions Manual page 74

Measurements
Static pressure
Running pressure (supply pressure)
j Natural gas
Carbon dioxide content CO
H at lower end of rated input range
(low fire)
H at upper end of rated input range
(high fire)
Oxygen content O
2
H at lower end of rated input range
(low fire)
H at upper end of rated input range
(high fire)
Carbon monoxide content CO
H at lower end of rated input range
H at upper end of rated input range
5581 775 1.3
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Service
Service
date:
date:
by:
by:
"w.c.
"w.c.
2
vol.-%
vol.-%
vol.-%
vol.-%
ppm
ppm
Service
Service Service
date:
date: date:
by:
by: by:
Service
Setpoint value
date:
by:
max.
14 "w.c.
4-14 "w.c.
Never exceed
50 ppm air-free
Never exceed
200 ppm air-free