Fill / Vent The System - Wolf CGU-2-18 Installation And Maintenance Instructions Manual

Filling the system
Automatic
air-vent valve
Internal filling
facility not for
<DE><AT>
Procedure for boilers without
internal filling facility
Gas shut-off valve
Heating flow
(incl. fill & drain
connection)
Heating return
(incl. fill & drain
connection)
Fig.: Shut off valves (accessory)
Procedure for boilers with
internal filling facility
not for <DE> <AT>
18

Fill / vent the system

Note
- Close the gas ball valve.
- Before connecting the gas fired boiler to the heating system, flush the entire
system to remove residues such as welding pearls, hemp, putty, etc. from
the pipework and to remove air that may have collected.
- Fill the DHW system of the boiler until water flows out of a DHW draw-off point.
Drain
valve
- To fill the heating system use the fill & drain connections. Open the cap of the
automatic air vent valve on the heating circuit pump by approx. 2 revolutions, but
do not remove the cap.
- Open all radiator valves and the shut-off valves on the heating water side of the
boiler.
- Fill the entire heating system and boiler via the fill & drain valves (Wolf
accessory) up to approx. 0.5 bar, whilst simultaneously venting the heating
system.
- Close the return shut-off valve on the heating water side of the boiler.
- Attach drain hose to the drain valve on the hydraulic assembly (alternative, if only
a fill & drain connection is provided).
- Clean the heat exchanger by opening the fill & drain valve and/or the
drain valve simultaneously on the hydraulic assembly
(make sure there is no air remaining in the heat exchanger).
- Remove the drain hose and open the boiler shut-off valve(s) on the heating water
side again.
Fill & drain
Connection
- After venting, raise the system pressure to 2.5 bar.
- Start the boiler, set the heating water temperature selector to position "2"
(pump running, illuminated signal ring (status display) constantly green).
- Vent the pump; for this, briefly open and then retighten the air vent
screw, optimum venting in pump stage 3.
Top up with water when the system pressure falls severely.
- Open the gas shut-off valve. Press the reset button.
- When in constant use the heating circuit vents automatically via the heating
circuit pump, venting optimum at pump stage 3. After venting set to pump
stage 1 or 2 for reduced noise, depending on customer preference.
- At system pressure below 1.0 bar the boiler may experience faults.
If necessary fill on heating side.
- Fill the entire heating system and boiler via the filling facility or an on-site
fill & drain valve up to approx. 0.5 - 1 bar, whilst simultaneously venting the
heating system.
- Close the shut-off valves on the heating water side of the boiler (flow and
return).
- Push the drain hose onto the drain valve of the hydraulic assembly.
- Clean the heat exchanger by opening the internal filling facility and the
drain valve simultaneously on the hydraulic assembly (make sure there is
no air remaining in the heat exchanger).
Fill the system and vent it thoroughly to safeguard the perfect
function of the gas fired boiler.
Otherwise there is a risk of faults.
The heating water must not be mixed with inhibitors or antifreeze;
otherwise leaks and flooding could result.
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