44
Filling the secondary circuit
Illustration showing connection sets (accessories).
A
B
Fig. 30
1.
Check the pre-charge pressure of the on-site
expansion vessel and adjust if required.
2.
Close the gas shut-off valve.
3.
Open the shut-off valves (poss. on site) on the
heating water side.
4.
Fill the heating system at drain & fill valve
A
in the
heating return, either on the side or top of the
appliance depending on the connection set.
Check the pressure at pressure gauge
B
.
■
Minimum system pressure 0.8 bar (0.08 MPa).
■
Max. permissible operating pressure 3.0 bar
(0.3 MPa).
Note
The safety valve opens at an operating pressure
of 4.0 bar (0.4 MPa).
Take into account the increased volume and
pressure caused by heating of the fill water dur-
ing operation.
Note
During commissioning (commissioning assistant),
the servomotor of the diverter valve is in a central
position. The system is filled completely.
5.
If the control unit was already on before filling (e.g.
on subsequent filling):
Switch control unit ON and enable filling program
for secondary circuit (see next chapter).
6.
Close drain & fill valve
A
.
Enabling the filling function for the secondary cir-
cuit
Note
A pressure of at least 2 bar (0.2 MPa) must be present
in the process circuit before the filling function can be
started.
Service menu
1. Press
OK
and
å
simultaneously for approx. 4 s.
2.
"System functions"
Service mode is being prepared, which can take
approx. 10 min
3.
"Fill the secondary circuit"
Filling function is enabled.
4. End the filling function:
Press
OK
or
ä
.
Venting the secondary circuit
Danger
Escaping heating water and hot steam can
cause serious injury and damage the heating
system.
Open flush & vent valves only when the heating
system is cold.
Commissioning, inspection, maintenance
Filling the secondary circuit
(cont.)
5678 044 GB
Summary of Contents for D2RA
Page 113: ...113 Maintenance Checking the Vitotronic 200 H accessories cont 5678 044 GB Maintenance ...
Page 133: ...133 Parts lists Sorption module hydraulics cont 5678 044 GB Components ...
Page 136: ...136 0001 0002 0003 0004 0005 Fig 83 Parts lists Miscellaneous 5678 044 GB Components ...
Page 163: ...163 5678 044 GB ...
