Glow-worm Ultracom2 sxi - Manual (Page 13)

0020092785_02 - 05/10 - Glow-worm
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Bypass
The boiler is fitted with an automatic bypass which can be
adjusted to suit your system requirements.
• Ensure that under no circumstances does the flow rate drop
below the figure specified, refer to chapter "Technical data".
Filling the sealed system
i
The water pressure at the boiler must be at least
1.2bar to operate the filling loop. If the pressure
is less than 1.2bar an external filling loop must be
fitted. If this pressure is not available contact the
local water authority.
Suitable external filling systems are shown diagrammatically,
see diagram below.
3
2
1
3
2
1
4
8
9
7
5
7 6
5
Key
1 Heating flow circuit
2 Heating return circuit
3 boiler
4 Double check valve assembly
5 Domestic cold water supply in
6 Temporary filling loop (remove immediately after filling)
7 Drain point
8 Back flow prevention device
9 Tundish
The system should be pressurised to 0.8bar, indicated on the
digital display with no heating demand.
Drain points
Drain taps must be provided at all low points of the system,
which will allow the entire system to be drained.
Drain taps shall be to the current issue of BS2879.
Water treatment
Existing system- It is essential that prior to installing the new
boiler the system is thoroughly flushed.
New system- For optimum performance after installation, the
boiler and its associated central heating system should also be
flushed.
Flushing shall be carried out in accordance with BS 7593, a
chemical cleanser can be used either Sentinel X300, X400 or
Fernox F3 are suitable.
It is recommended to flush existing systems first before fitting
the new boiler.
• Ensure all cleanser is removed from the whole system before
adding an inhibitor.
For long-term corrosion protection after flushing, an inhibitor
suitable for stainless steel heat exchangers can be used. Either
Sentinel X100 or Fernox F1 inhibitor can be used.
The boiler is suitable for use on systems using softened water.
7.3 Dimensions
418
344
130
346
740
INSTALLATION