DUO PREX N OPERAT ING PRINCIPLES
The boiler consists of 2 overlapped units of same capacity and one only control panel for both units. Each unit can work
independently and the boiler can be operated partially. This means that all panel controls (burner switches, thermostats and
thermometers) have been doubled. See paragraph 4.5 on connection. As an example, bi-thermostats TR1 and TR2 can
be adjusted so that there is a 10°C intervention difference between each other (do not forget that knobs have a 60° to 90°
regulation range with a 1/4 turn rotation). Flow water temperature after 2 equal flows have been mixed corresponds to mean
temperature displayed by the 2 thermostats of each unit.
DUO PREX N CONTROL PANEL
The standard control panel is made of plastic with IP40 protection degree and houses the regulation and safety
instruments:
The upper part of the control panel can be removed to gain access to the terminal board and uncoil the thermostat
and thermometer capillaries. A copy of the wiring diagram is contained inside the control panel.
The regulation bi-thermostats (TR1 and TR2)
have an operating range from 60° to 90° and can be set by the user by
means of the front knob. The temperature differential of each bi-thermostat is fixed and approx. 7°C.
Safety thermostats (TS1 and TS2)
have a fixed setting of 100 (+0/-6)°C and can be manually reset in accordance with
Ministerial Decree 1/12/75 «R».
Circulator consent thermostats (TL1 and TL2)
have a fixed setting of 50°C with a working range of 6°C: at start-up, with
the heating system cold, this permits higher boiler temperatures to be maintained thus reducing the risk of flue gas conden-
sation.
For correct installation, refer to the boiler casing assembly instructions..
Note:
both hour meters start each time their own burner starts. It is recommended that the numbers displayed by both hour
meters are monitored . This helps guarantee that upper and lower burners have almost the same number of working hours.
INSTALLATION
2
1
st
boiler burner switch
3
Plant circulation switch
4
2
nd
boiler burner switch
7
1
st
boiler thermometer (TM1)
8
1
st
boiler regulation
bi-thermostat
(TR1)
9
1
st
boiler safety thermostat (TS1)
10
2
nd
boiler thermostat (TM2)
11
2
nd
boiler regulation
bi-thermostat
(TR2)
12
2
nd
boiler safety thermostat (TS2)
13
1
st
boiler Circulator
consent thermostat (TL1)
14
2
nd
boiler Circulator
consent thermostat (TL2)
15
Hour meter
- 36
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Содержание MEGA PREX N Series
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