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1.0 Introduction
5
1.1 Description
1. The Baxi Combi Instant 80 HE or 105 HE is a fully
automatic gas fired wall mounted condensing combination
boiler. It is room sealed and fan assisted, and will serve
central heating and mains fed domestic hot water.
2.The unit incorporates a small storage cylinder built into the
boiler providing hot water the moment the tap is turned on.
3. The boiler is set to give a maximum output (condensing)
of 25.2 kW (Instant 80 HE) or 31.0 kW (Instant 105 HE).
4. It is designed for use on Natural Gas (G20) and can be
converted to use Propane.
5. The boiler is suitable for use only on fully pumped sealed
heating systems. Priority is given to domestic hot water.
6. The boiler data badge gives details of the model, serial
number and Gas Council number and is situated on the
control box. It is visible when the case front panel is
removed (Fig. 1).
7. The boiler is intended to be installed in residential /
commercial / light industrial E.M.C. environments on a
governed meter supply only.
8. The boiler must be installed with one of the purpose
designed flues such as the standard horizontal flue kit, part
no. 5111073.
9.
All systems must be thoroughly flushed and treated with
inhibitor (see section 6.2).
1.2 Instant Domestic Hot Water
(Expansion Vessel & Pre-Heat Store)
1. The boiler expansion vessel incorporates a small volume
of stored primary hot water.
2. When the boiler has been off and there is then a demand
for domestic hot water the stored primary hot water
ensures that domestic hot water is supplied instantly at
temperature.
3. The stored hot water is part of the primary circuit. This is
not supplied as domestic hot water, which is fresh mains
water heated by a heat exchanger within the boiler.
4. The stored primary hot water temperature is maintained
whilst the boiler is in operation. During a period when there
is no demand for heating or hot water the temperature of
the stored primary hot water will eventually fall. The boiler
will operate occasionally in order to maintain the
temperature. This is indicated by the domestic hot water
mode neon flashing.
1.3 Optional Extras
Various flue extensions, bends, vertical flue kits,control
accessories etc. are available as optional extras. These are
detailed in a separate publication.
Data Badge
Fig. 1
Control Box
Case Front Panel