12 Doc890/3456CV02B
1.5 General restrictions
The application, installation and maintenance of Rendamax products must always be carried out
in accordance with the requirements (legal or otherwise), specifi cations and standards applicable
to such installations.
All data, information and suggestions pro ided by Rendamax B.V. in relation to its products are
based on careful in estigation. Ne ertheless, neither Rendamax B.V. nor any other organisation
connected with Rendamax B.V. accepts any liability for application, installation or exploitation
that occurs outside its sphere of infl uence.
Change may be incorporated without prior notice.
Rendamax accept no obligation to adapt previou ly deliv ered product to incorporate uch
change .
2 Description
2.1 General
The R3400/R3500/R3600 series are en ironmentally friendly modulat ing gas fi red heating boilers
that can ary its output from 25% to 100% of its maximum capacity. The series R3400 consists of
6 types in a range from 657 to 1189 kW.
The series R3500 consists of 5 types in a range from 613 to 1000 kW. The series R3600 consists of
5 types in a range from 631 to 1031 kW.
The units ha e an extremely low emission of NOx and CO, so that this boiler satisfi es the most
stringent European require ments.
The R3400/R3500/R3600 series ha e CE appro al for the following countries:
Austria, Belgium, Denmark, France, Germany, Ireland, Italy, The Netherlands, Spain and the
United Kingdom.
The series is registered under the product identifi cation number 0063AR3514.
The units can be supplied either as a standard (category B23) or a room sealed (categories C53,
C33 or C63) appliance.
Working principle and con truction
Air is blown into the appliance, as required, by a speed-con trolled fan and thoroughly mixed with
gas in the correct propor tions.
A temperature controller compares the desired water tempera ture with the temperature of the
water fl ow and sends a signal to the frequency con erter to maintain the correct heating capacity.
The gas/air mixture so formed is passed through a cooled premix burner and ignited. The premix
burner is constructed of fi nned bimetallic pipes (internally from stainless steel and externally
from aluminium) with cast iron water headers.
Heat transfer takes place in two or three heat exchangers. The fi rst heat exchanger is constructed
from smooth stainless steel pipes, while the second heat exchanger is fi tted with laser welded,
stainless steel fi nned pipes. Both heat exchangers are fi tted with cast iron profi led water distribu-
tion components (headers) which guarantee an optimum water fl ow through the appliance.
The burner and the heat exchangers are connected in series.
At the R3600 a third heat exchanger is attached wich consists of one or more stainless steel fi n
tube(s), switched in series, in form of a spiral. It is arranged on the back of the boiler on the fl ue
gas collection chamber.
