U.M. Mara 001143, Manual

40

GB

Plumbing system connection

There are 2 different types of systems:  
- Closed vessel system  
- Open vessel system.

Closed vessel system

This  product  has  been  designed  and  built  to  work  with 
closed  vessel  systems.  In  general,  the  closed  vessel 
system  has  the  following  expansion  as  the  expansion 
vessel  pre-loaded.  In  addition  to  the  expansion  device, 
the closed vessel system must be provided in accordance 
with current Italian UNI 10412-2 (2009) by:

•

safety valve

•

thermostat control of the circulator

•

device alarm sounds

• 

temperature Indicator

•

pressure indicator

•

audio alarm

•

automatic adjustment

•

safety thermostat with manual reset

•

circulation system

Open vessel system

The  open  vessel  system  is  a  more  secure  system  that 
does not require the addition of further securities.
The fireplace stoves, wood boilers and stoves necessarily 
require use of an open vessel system.
A plant run open vessel, connected to a thermoproduct, 
may provide for circulator mounted on the return, in this 
way the system would work at lower temperatures to the 
advantage of a longer life.
While  working  under  optimal  conditions,  the  pump 
mounted on the back can push the water through the tube 
pan on safety and can make it back in the system through 
the  inlet  pipe  causing  a  phenomenon  of  oxygen  that  is 
highly damaging to life of the boiler.

To  prevent  this  phenomenon,  it  is  possible  to  apply  the 
following measures

: 

•

lower  the  speed  of  the  pump  so  as  to  reduce  the 

prevalence

•

hold,  if  possible,  the  tray  a  little  lower  and  raise  the 

maximum allowed the safety tube

•

 perform the separation between the safety pipe and the 

discharge pipe, not at an angle of 90 ° but with a curved 
connection.

The  pressure  relief  valve  (C)  must  always  be  connected 
to  a  water  drain  pipe.  The  tube  must  be  capable  of 
withstanding high temperature and pressure.

A1 = heating water delivery  3/4 “ M 
A2 = heating water return 3/4 “ M 
C = safety valve  3/4 “ M

The connection of the stove to the 
plumbing system must be made ONLY by 
specialized personnel who are capable of 

carrying out installation properly, in compliance 
with current standards in the country of installation. 
The manufacturer will not be held responsible for 
damage to persons or things in the event of failed 
operation if the aforementioned warning is not 
complied with. 

Diagram connection kit without hot water 
thermostove

A1

A2

WATER

DELIVERY

WATER

RETURN

C