MHS Boilers DUOMAX N Series, Руководство пользователя, Страница: 22 / 30

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MONOMAX N / NS - NC / NCS
DUOMAX N / NS - PN / PNS
MHS
Prevention of Condensation
Condensation within steel boilers is very harmful and precautions must be taken within the system design to prevent
condensation from occurring within the flueways. The boiler should work at a return temperature in excess of 60°C. In order
that the boiler should reach this temperature as quickly as possible, it is imperative that an anti-condensation system is
installed. This is achieved by installing a bypass between flow and return pipes as shown below.
System Water
Monomax and Duomax boilers must always be installed on closed systems, whether they are of open vented or sealed and
pressurised type.
All systems should be thoroughly cleaned prior to the installation of the boiler and the system water must be treated with a
good quality corrosion inhibitor to prevent the deposition of scale or sludge in the boiler waterways. The system water must
be of a sufficient quality to maintain the following requirements:
• pH between 7 and 8
• hardness between 8 and 12 grammes of calcium carbonate per 100 litres of water.
Clearances
Front Clearance
Equal to approximately the length of the boiler base should be allowed for tube cleaning or tube repairs. Shorter clearances
are possible subject to cleaning methods and plantroom layout.
Side Clearance
Boilers may be arranged in “close to” battery formation but a minimum of 450mm should be allowed where possible.
Rear Clearance
Sufficient space should be allowed for connection of the flue system and for rear inspection and maintenance.
Burner Clearance
Consideration must be given to the clearance required by the burner, particularly when the boiler door is open at 90°, and
this point must be considered when positioning boilers if it is desirable to retain the burner affixed to an open door. The
matched burner, as a general guide, will project from the front of the boiler by approximately 30% of the boiler length.
Boiler Base
Monomax and Duomax boilers should be installed on a level fireproof plinth with a minimum height of 100mm. The plinth
must be capable of supporting the weight of the boiler/s when they are filled with water. The front of the plinth can be level
with, but not extend beyond, the front of the boiler casing. Depending on the make of burner selected, dual fuel applications
may require a higher plinth. Details will be provided on request.
1 - Boiler
2 - Burner
3 - Min Temp Thermostat (TR)
4 - Anti-Condensation Pump
5 - Non-Return Valve
6 - Boiler/System Pump
Install an anti-condensation pump as shown in the
diagram on the left. The pump (4) should be
controlled by the minimum temperature thermostat
(TR) (3) which should be set at not less than 60ºC.
The minimum flow rate for the anti-condensation
pump is detailed in the Technical Data Tables under
the heading “Shunt Recirculation Flow Rate”
Failure to observe this important installation and
operational requirement will render the warranty
on the boiler null & void.
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