Buderus 800 - 2.2.3 Measuring gas supply pressure

Initial start-up 2
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements!
29
type 800 – 24T25 H/V and 800 – 29T25 H/V
Setting the hot water flow limiter
 Set the desired value on the flow volume limiter
(fig. 33), e.g. for 60 °C at 6 liters/min for type 800 –
24T25 or 8 liters/min for type 800 – 29T25.
2.2.3 Measuring the gas supply pressure (flow pressure)
 Open at least one radiator thermostat valve.
The gas boiler must not be turned on yet.
 Move the chimney sweeper switch (fig. 34) to posi-
tion "1".
On type 800 – 60 the full capacity is achieved after
approx. one minute. Therefore measurements
should be carried within one minute of boiler opera-
tion.
 Loosen the screw plug on the gas distribution pres-
sure test nipple on Honeywell gas units (fig. 35,
item 1) two turns, fully unscrew the plug on SIT gas
units (fig. 36, item 1).
 Fit the measuring hose of the pressure gauge to the
test nipple (fig. 35, item 2 or fig. 36, item 2).
 Slowly open the gas service valve.
 Insert the mains plug and move the mains switch to
"I". After about 30 seconds the burner will fire.
 Measure the gas distribution pressure and enter into
the certificate.
The gas distribution pressure must be
min. 17 mbar, max. 25 mbar, rated distribution
pressure 20 mbar for natural gas H and
min. 30 mbar, max. 50 mbar, rated distribution
pressure 37 mbar for LPG.
 Pull off the measuring hose and tighten up the screw
plug on the test nipple.
fig. 33 Hot water flow volume limiter
Turning to the right = reducing the flow volume
Turning to the left = increasing the flow volume
fig. 34 Chimney sweeper switch
12
10
01
11
KW
10
1
10
1
01
1
I
0
fig. 35 Measuring the gas distribution pressure
(Honeywell gas units)