Commissioning; Filling Secondary Dhw Circuit; Filling The Primary Circuit - Vaillant uniSTOR VIH GB SERIES Instructions For Installation And Use Manual

6 Commissioning

6 Commissioning

6.1 Filling Secondary DHW Circuit

Note:
Do not manually open the temperature and
pressure relief valve or expansion relief valve for
venting purposes (any foreign matter in the
pipework may cause damage to the valve seats).
•
Ensure that the cylinder drain valve (9, fig. 6) is
closed.
•
Open all the hot and cold water taps or other terminal
fittings.
•
Open the mains water supply to the uniSTOR and
continue filling until water runs freely from the
terminal fittings, ensuring all air pockets are purged.
• Close the terminal fittings and check the system for
leaks. Specially check the connection of the immersion
heater for leaks.
The system should now be thoroughly flushed.
•
Open hot water taps at opposite ends of the system
and allow water to discharge for at least 5 minutes.
•
Close the hot water taps.
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6.2 Filling the Primary Circuit

Note:
Do not use boiler pressure relief valve for
venting purposes.
•
The complete primary CH system must be flushed out
with both cold and hot water. Fill and vent the central
heating system as detailed in the boiler installation
instructions.
To assist with this operation set the manual override
lever on the 2 port diverter valve (fig. 7) to the
MANUAL position, and lock in this position by pushing
the lever into the valve head.
•
Completely drain the CH system, then refill and vent.
•
Reset the lever on the 2 port valve to the "AUTO"
position by releasing the manual operating lever from
the valve head (pull outwards).
For commissioning purposes and to reduce the time
for the cylinder contents to reach temperature, set the
cylinder hot water thermostat knob (1, fig. 14) to
setting middle position (approx. 40 °C).
L
N
Fig. 14 Electrical Connections to Cylinder Controls
•
Operate the boiler as in section 6.3 until both the
cylinder has reached temperature and all radiators in
the system are hot. Then once again drain the
complete CH system to remove residues from the
pipework and refill and vent again as above.
•
Reset the manual operating lever on the 2 port valve
to the "AUTO" position once the system has been
refilled and vented.
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uniSTOR GB