Baxi LUNA HT 1.280, Installation, Operation And Maintenance Manual

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5. Installation
5.1 Connect heating circuit
Note: It is recommended that a filter be fitted in the heating return. In the case of
old plants, the whole heating plant should be thorougly flushed before instrallati-
on.
Safety valve
In case of open heating plants, connect the safety header and return pipeline; in
case of closed heating plants install the expansion vessel and safety valve.
Caution! The connecting pipe between boiler and safety valve must not be block-
able. Fitting of pumps and fittings or pipe reducer pieces is not permissible. The
blow-off line of the safety valve must be so designed, that the pressure does not
increase as one approaches the safety valve. It must not be led into free space, the
opening must be clear and observable. Heating water that may possibly escape
should be safely drained off.
5.2 Condensated water
connection
A direct run-off of the condensate into the domestic drainage system is only allo-
wed, if the system only comprises corrosion resistant materials (e.g. PP-pipe,
stoneware or similar materials). If this is not the case, a suitable neutralisation
plant must be installed.
The condensate must be able to flow freely into a tundish. A siphon trap must be
installed between the tundish and drainage system. The condensate hose of the
Power HT must be inserted through the opening in the rear or side wall.
If there is no drain underneath the condensate discharge, the use of a suitable
neutralisation plant and pump is necessary.
5.3 Sealing and filling of the
plant
- Filling the heating plant
- Check tightness (max.water test pressure 6 bar).
5.4 Flue system
The Flue system must provide satisfactory control of condensation, in accordance
with Part J of the Building Regulations:
- Use components that are impervious to condensates and suitably resistant to
corrosion (i.e. stainless steel grade 316 etc.)
- Make provision for draining, avoid ledges, crevices etc (e.g. most flexible liners
are not suitable)
- Make provision for disposal of condensate to suitable drain point (e.g. PP pipe or
stainless steel condensate drain with water seal siphon trap. Copper should not
be used)
Owing to low flue gas temperatures only single skinned flue pipe is necessary in
areas where personal protection is required (maximum temperature of 90°C.) The
number of bends used should be kept to a minimum and bends used should be of
the swept type. 90° tees should not be used. If an existing chimney is being re-
used, this must lined with a correct liner suitable for condensing operation. Termi-
nation of flue must be to current standards both for height and distance from ad-
jacent objects i.e. other terminals, opening windows or doors and walls.
Flue lengths
Permissible Flue Lengths for Room Air Dependent Operation:
Installation
32 358 436 08.10