Weishaupt WTC 45-A, Installation And Operating Instructions Manual

Page: 18 / 90

Unsuitable water results in scaling and
corrosion formation and can cause damage
to the condensing boiler.
18
4
4.4 Mains water connection
Hydraulic connection
1 Gas Ø 22 mm
2 Heating flow Ø 28 mm
3 Condensate outlet Ø 32 mm
4 Heating return Ø 28 mm
Application in sealed heating systems
☞
Connect flow and return (pipes should be rinsed
thoroughly before connecting).
☞
Install boiler, inlet and outlet valves
(available as an accessory).
☞
Install safety valve (available as accessories).
☞
Fit expansion tank.
☞
Fit sludge trap in return pipe (if required).
40
35
50
18,2
129
50
45
4
160 300
35
320
4
4
3
3
1
1
2
2
4.5 Filling with water
When filling the heating system, the requirements for the
heating system water (see also Ch. 3.5) should be
observed.
ATTENTION
☞
Check pre-pressure of the diaphragm expansion
vessel.
☞
Prior to first commissioning, the heating system
should be flushed with at least twice the amount of
the system content to remove contaminants. Swarf,
rust, scale, sludge etc. can influence the operational
safety.
☞
Open all thermostatic valves in the system.
☞
Loosen cap of quick action vent valve.
☞
Open service cocks for heating flow and return.
☞
Slowly fill heating system from tap connected to the
heating return (minimum system pressure >1.0 bar).
Observe all relevant regulations.
☞
Vent all radiators.
☞
Once the system has been vented, check system
supply pressure, if necessary repeat fill procedure.
☞
Seal joints and screwed unions should be checked to
ensure they are tight.
Note: The unit and any separately fitted pumps
must be switched off during filling.