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5.3 Hydraulic circuits with Low Loss Header
5.3.1 Single boiler installation
The boiler is weather compensated, taking into account a
minimum return water remperature of 35°C and the cir-
cuits are also weather compensated. The heating curve
of the boiler is then set approx. 5°C higher than the high-
est demanding circuit. Each circuit has its own pump.
The water fl ow is handled by a boiler pump sized for the
nominal ow rate of the boiler.
All gas appliances must, by law, be installed by com pe-
tent persons (e.g. Corgi) in accordance with the above
regulations. Failure to install appliances correctly could
lead to prosecution.
It is in your own interest and that of safety to ensure that
the law is complied with.
In addition to the above regulations, this appliance must
be installed in compliance with the current I.E.E. Regula-
tions for electrical installation, local building regulations,
the Building Standards (Scotland), Consolidation Regula-
tions, by laws of the local water undertaking and Health
and Safety Document No. 635 'The Electricity at Work
Regulations 1989'. It should also be in accordance with
the relevant recommendations in the current editions of
the following British Standards and Codes of Practice,
viz. BS 5440 Pt 1 and 2, BS 5449, BS 5546, BS 6798,
BS 6891 and BG.DM2.
Important:
The Remeha Gas 3002 is a certifi ed appliance and must
not be modifi ed or installed in any way contrary to these
"Installation and Servicing Instructions". Manufacturers
Instructions must NOT be taken in any way as overriding
statutory obligations.
5.5 Flue gas discharge and air supply
5.5.1 General
The Remeha Gas 3002 is available in either a conven-
tional room ventilated or a room sealed (Type B13, C33,
C53 or C63) construction. Specify at the time of ordering
if the boiler is required to be supplied for room sealed
operation. In that case, the boiler will be supplied with an
air supply connection and a clamping band.
This connection must be fi xed to the fan inlet (remove the
cover plate on the rear top casing).
- Conventional room ventilated operation:
The open boilers use ambient air as combustion air.
See para. 5.5.3 for a ue gas discharge table of the
Remeha Gas 3002 in room ventilated construction.
- Room sealed operation:
A sealed system is obtained by using an air supply
pipe. Because of this, the number of potential boiler
locations within the building is increased and less strin-
gent requirements are imposed on the discharge loca-
tion, since the air supply and the fl ue gas discharge are
in the same pressure area.
As open air is generally cleaner, the room sealed
option ensures max runtime before the heat exchanger
will need cleaning.
See para. 5.5.4 for a ue gas discharge/air supply
table of the Remeha Gas 3002 in room sealed
construction.
- Fan dilution system:
Between boiler and fan dilution system has to be an
open connection (draft diverter).
Fig. 05 L.L.H. with boiler pump with a single boiler
installation
5.3.2 Modular boiler installation
Example: 1 x condensing boiler + 1 x standard boiler
in modular arrangement with water-side shutdown of the
boiler which is out of operation, by means of a butterfl y
valve. The boilers are directly weather compensated, ta-
king into account a minimum return water temperature of
35°C for the standard boiler.
The heating curve of the boiler is then set approx. 5°C
higher than the highest demanding circuit.
For more information concerning hydraulic diagrams con-
tact our technical sales department.
Please note:
1) If the water resistance of boilers 1 and 2 is not the
same, the boiler with the less resistance should have
a regulating valve.
2) The condensing boiler is always the lead boiler.
5.4 Installation instructions
The following instructions must be adhered to when the
Remeha Gas 3002 is installed:
Gas Safety (Installation and Use) Regulations 1984 (as
amended).
Fig. 06 L.L.H. with boiler pump in a modular boiler
installation
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