MHS Boilers Ultramax 115, Operating & Maintenance Manual, Page: 7 / 46

MHS Boilers Ltd ©
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1.5 General restrictions
The application, installation and maintenance of MHS products must always be carried out
in accordance with the requirements (legal or otherwise), specifications and standards applicable
to such installations.
All data, information and suggestions provided by MHS Boilers Ltd. in relation to its products are
based on careful investigation. Nevertheless, neither MHS Boilers Ltd. nor any other organisation
connected with MHS Boilers Ltd. accepts any liability for application, installation or exploitation
that occurs outside its sphere of influence.
Changes may be incorporated without prior notice. MHS Boilers Ltd. accepts no obligation to
adapt previously delivered products to incorporate such changes.
2 Description
2.1 General
The Ultramax series are environmentally friendly modulating gas fired heating boilers with variable
outputs from 20% to 100% of maximum capacity.
The Ultramax series consists of 7 types in a range from 73 to 278 kW.
The units have an extremely low emission of NO
x
and CO, so that this boiler satisfies the most
stringent European requirements.
The Ultramax series have CE approval for all relevant European countries. The series are registered
under the product identification number 0063BL3354.
The boilers are standard supplied as a standard (category B23) or a room sealed (categories C53,
C33 or C63) appliance.
Working principle and construction
Air is blown into the appliance, as required, by a speed-controlled fan and thoroughly mixed with
gas in the correct proportions.
A temperature controller compares the desired water temperature with the temperature of the water
flow. If required, the controller will vary the load and the fan will emit a speed feed back signal
to maintain the correct heating capacity.
The gas/air mixture so formed is passed through the cooled premix burner and ignited. The
premix burner is constructed of finned bimetallic pipes (inside stainless steel, outside aluminium)
and cast iron water headers. (Replaced with Stainless Steel On The Water Heater Versions.)
Heat transfer takes place in three heat exchangers. The first heat exchanger is constructed from
smooth stainless steel pipes, while the second heat exchanger is fitted with laser-welded, stainless
steel finned pipes. The third heat exchanger is fitted with smooth stainless steel pipes.
All heat exchangers are fitted with cast iron water headers (stainless steel for water heater) which
guarantee an optimum water flow through the appliance.
The burner and the heat exchangers are connected in series.
The Ultramax units have a small water capacity so that it can rapidly adjust to changing conditions.
It can be installed without any restrictions to the return water temperature. The necessary water