Unical DUA plus, Installation And User Instruction Manual

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23
Installation info
fig. 24
T Thermostatic sensor (only for T models)
E Electrical actuator (only for E models)
1 Diverting valve
2 Minumum water pressure switch
3 TES Thermostatic limiter in the D.H.W. flow
rate (TES)
4 Gas valve
5 Filling system cock
6 D.H.W. flow switch
7 Pump
8 Draining valve with connection for flexible hose
9 C.H. safety valve
T 2 3
1
E
2
3
1
4
5
6
8
7
9
9
ELECTRICAL
TERMOSTATIC
2.4 - FILLING THE SYSTEM
After completing all the connections of the
system the heating circuit can be filled.
This filling operation must be performed
with care as follows:
- open the air vents of the radiators and
check that the automatic air vent in the
boiler is works properly;
- gradually open the water tap and check
operation of any automatic air vents
installed in the system;
- close the air vents on the radiators as
soon as water comes out;
- use the pressure gauge on the boiler to
check that the pressure has reached the
value of 0.8/1bar;
- close the water inlet tap and then release
the air again through the radiator air vents;
- after switching on the boiler and after the
system has reached the correct
temperature, stop the pump and repeat the
air relief operations;
- let the system cool down and then adjust
the water pressure to 0.8/1 bar.
This must be performed when the system
is cold. Use the temperature and pressure
gauge on the boiler to read the pressure
value of the circuit.
WARNING
The minimum water pressure switch does
not give electrical impulse to the burner to
ignite when the pressure is lower than 0.4
bar. The pressure of the water in the C.H.
system must not be lower than 0.8/1bar; if
this value is lower use the water filling tap
on the boiler to adjust the pressure.
This must be performed when the system
is cold. Use the temperature and pressure
gauge on the boiler to read the pressure
value of the circuit.
NB: NB:
NB: NB:
NB: Af Af
Af Af
After a given period of inactivity ter a given period of inactivity
ter a given period of inactivity ter a given period of inactivity
ter a given period of inactivity
and without electrical supply the and without electrical supply the and without electrical supply the and without electrical supply the and without electrical supply the
pump could be blocked.
pump could be blocked. pump could be blocked. pump could be blocked. pump could be blocked.
Before switching on the boiler it is
Before switching on the boiler it is Before switching on the boiler it is Before switching on the boiler it is Before switching on the boiler it is
important to restart the pump as
important to restart the pump as important to restart the pump as important to restart the pump as important to restart the pump as
f o l l o w s :
f o l l o w s : f o l l o w s : f o l l o w s : f o l l o w s :
- loosen the protection screw in the
centre of the pump motor,
- insert a screwdriver in the hole and then
manually rotate the pump shaft
clockwise.
Once the pump has been restarted tighten
the protection screw and check that there
are no water leaks.
WARNING
Once the protection screw has Once the protection screw has
Once the protection screw has Once the protection screw has
Once the protection screw has
been removed a little water may
been removed a little water may been removed a little water may been removed a little water may been removed a little water may
leak out. Before replacing
leak out. Before replacing
leak out. Before replacing leak out. Before replacing
leak out. Before replacing
the casing of the boiler dry any wet
the casing of the boiler dry any wet the casing of the boiler dry any wet the casing of the boiler dry any wet the casing of the boiler dry any wet
s u r f a c e s .
s u r f a c e s . s u r f a c e s . s u r f a c e s . s u r f a c e s .
- there are no water leaks.
SWITCHING ON AND OFF
To switch on and off the boiler follow the
indications in the “
Users’ Instructions ”.
- the supply voltage of the boiler is 230 V-
50 Hz;
- the system is correctly filled with water
(pressure at the gauge 0.8/1 bar);
- any gate valves of the system are open;
- the mains gas corresponds to that with
which the boiler has been adjusted;
otherwise convert the boiler to use the gas
available on site (see: “MODIFICATION
FOR OTHER GASES “):
this operation
must be performed by qualified
technicians;
- the gas supply taps are open;
- there are no gas leaks;
- the external mains switch is on;
- the boiler’s safety valve is not locked;
2.5 - STARTING THE
BOILER
PRELIMINARY CHECKS
Before starting the boiler check that:
- the boiler installation has been made in
accordance with all the applicable
regulations concerning water and gas
installation, smoke evacuation and electrical
installation
- the flue gas exhaust duct and its terminal
are installed correctly:
when the boiler is
switched on there must be no
leakage of any combustion products
from any seals;
fig. 25