Viessmann VITODENS 200-W WB2B Series Start-Up/Service Instructions page 10

Initial Start-up and Service
Steps
I
nitial start-up
B
A C
Fig. 4
F Automatic air vent
I
nitial start-up
10
1. Bleed air from boiler heat exchanger
1. Connect hose to boiler filling tap E
and other end to a fresh water
supply (or heating medium).
2. Open fresh water supply valve and
then the boiler filling tap E slowly
(isolation valves connected to C
and D must be closed during
fill/bleed process).
3. Flush boiler heat exchanger via
D E
boiler supply and return (for at least
10 min.) until all air is removed
from the boiler.
4. When drain valve A begins to
bleed water, close boiler drain valve
A, then boiler fill valve E and
open system isolation valves.
5. If the control unit has not been
switched ON prior to filling the
F
system, switch the control to ON,
and activate the air bleed program
by setting coding address "2F" to
"1" (boiler pump sÖ will be switch
ON and OFF for 30 sec. at a time
over a period of 20 minutes. The
program is automatically disabled
after 20 minutes, and coding
address "2F" is set back to "0").
6. Check system pressure.
7. Ensure adequate fuel supply exists
and open gas shutoff valve.
2. Fill siphon with water
1. Remove retaining clip A and
siphon B.
2. Fill siphon B with water.
3. Re-attach siphon B and secure
with retaining clip A.
To access coding level 1 and setting
the coding address see page 37. For
function and sequence of the air
bleed program, see page 65. While
the air bleed program is running, the
display will show "Entlüftung"
(bleeding air).
Max. operating pressure...45 psig
Min. operating pressure...14 to 23 psig
Pressure relief valve......30 psig