Water Treatment - Worcester Greenstar Heatslave II 12/18 Installation, Commissioning & Servicing Instructions

6.4

Water treatment

NOTICE:
Debris from the system can damage the boiler and
reduce efficiency.
Failure to comply with the guidelines for the use of water
treatment with the appliance will invalidate the
appliance warranty.
Flushing (Central heating)
1. Switch off the boiler.
▶ Open all radiator valves/drain cocks [C] and drain the system while
the appliance is hot.
▶ Close drain cocks [C].
1
C
Fig. 61
2. Add a suitable flushing agent and refill the system at the correct
strength for the system condition in accordance with the
manufacturer's instructions.
▶ Vent the boiler (there are two vent points [A] at the top of the
secondary heat exchanger (only one may be in use, the other may be
obscured by side fluing) and one on the flow pipe.
Always vent [A] and the vent screw [B] on the pump and all radiators.
▶ Run the boiler/system at normal operating temperature for the time
stated by the flushing agent manufacturer
2
6 720 805 209-48.1TL
Fig. 62
3. Drain and thoroughly flush the system and boiler [C] to remove the
flushing agent and debris.
Greenstar Heatslave II External ErP - 6 720 813 345 (2014/09)
C
6 720 805 209-47.1TL
A
A
3
6 720 805 209-49.1TL
Fig. 63
Inhibitor (Central heating)
4. Check drain cocks and manual air vents are closed and all radiator
valves are open.
5. Add a suitable inhibitor, (or combined inhibitor/anti-freeze if the
system is exposed to freezing conditions) to the heating system in
accordance with the manufacturers instructions.
The inhibitor or combined inhibitor/anti-freeze must not cause damage
to the materials within the boiler (mild steel, stainless steel, copper and
brass) and any other materials/components within the system.
▶ Fill the system to between 1 and 2 bar via a WRAS approved filling
loop. Check the system pressure during venting and repressurise if
necessary.
6. Vent the boiler, there are two vent points [A] at the top of the
secondary heat exchanger, and one in the flow pipe.
Always vent [A] and the vent screw [B] on the pump and all radiators;
retighten vents when complete.
6
Fig. 64
7. Record the date when the inhibitor was added to the system on the
guarantee card.
The concentration level of inhibitor in the system should
be checked every 12 months or sooner if system content
is lost.
The addition of sealing agents to the system water is not advised as this
can cause problems with deposits left in the heat exchanger and
invalidate the appliance and heat exchanger warranty.
Commissioning
C
A
A
6 720 805 209-50.1TL
31