Buderus 800 - Page 31

Initial start-up 2
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements!
31
 Move the hot water temperature controller to "1".
 Read the differential pressure.
The differential pressure (p
Gas
- p
Air
) must be -5 Pa
(±5 Pa) (display on the meter: -10 to 0 Pa).
 In case of gas/air ratio deviations, adjust by using the
setscrew (fig. 38, item 3 or fig. 39, item 2).
 Set mains switch and chimney sweeper switch to "0".
 Remove the measuring equipment, tighten up the
screw in the burner pressure measuring nipple, put
the hose back on P1.
 Set the hot water temperature controller back to the
original value.
 Move the mains switch to "I".
Adjustment according to the CO
2
content (natural
gas):
 The mains switch must be set to "I" and the chimney
sweeper switch to "1".
 Press the service button (fig. 37) until "Y" is shown on
the display.
Full load
 Move the hot water temperature controller to "10".
 Measure and record the CO
2
content on the flue gas
measuring point (fig. 40).
Partial load
 Set the hot water temperature controller to "1".
 Measure and record the CO
2
content.
The CO
2
content under partial load must be 0.7 %
lower than the one under full load.
If the measured value is too high or too low, use the
setscrew of the gas burner unit (fig. 38, item 3 or
fig. 39, item 2) to set the gas/air ratio under partial
load.
 Set the hot water temperature controller to the origi-
nal value.
 Set the chimney sweeper switch to "0".
2.2.5 Checking for leaks in operational condition
 Check with the burner running, all joints across the
entire gas route of the burner using a foaming agent.
The agent must be certified as a gas leak test agent.
Do not apply the agent to electrical connection ca-
bles.
fig. 39 Checking and adjusting the gas/air ratio (SIT gas
unit)
1
2
fig. 40 Flue gas measuring point