Nova Florida Pictor Dual Installation, Use And Maintenance Manual - page 25
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3.2.16 Adjustable by-pass
The boiler is equipped by an adjusta-
ble by-pass. By-pass operation can
be inhibited.
Pic. 20 shows adjusting by-pass
screw set for by-pass operation pre-
clusion, pic. 20a shows adjusting
by-pass screw set for by-pass ope-
ration.
3.3 Loading the system
Once all boiler connection have
been completed, CH system can
be filled.
This procedure must be cautiously
carried out, following each below
indicated step:
- Open the air purging valves on all
radiators and verify the boiler auto-
matic valve operation.
- Gradually open the boiler filling tap
to load the system, checking that all
automatic air purging valves instal-
led in the system properly work.
- Close all radiator air purging val-
ves as soon as water starts coming
out.
- Check boiler water pressure gauge
not to exceed 0.8 / 1 bar reading.
- Shut the boiler filling stopcock and
bleed any air out again by opening
all bleeding valves on radiators.
- Start the boiler, as soon as the
system reaches working temperatu-
re, stop the pump and repeat the air
bleeding procedure.
- Allow the system to cool and resto-
re water pressure to 0.8 / 1 bar.
WARNING
As far as domestic heating systems
treatment of water is concerned, in
order to optimize performance and
safety, to preserve these conditions
over time, to ensure long-lasting
regular operation of auxiliary equip-
ment as well, and to minimize ener-
gy consumption, thereby integrating
current laws and standards it is advi-
sable to use specific products that
are suitable for multi-metal plants.
WARNING
Safety low water pressure switch
will not allow the burner to be star-
ted when water pressure is below
0.4/0.6 bar.
CH system water pressure must not
be below 0.8/1 bar. Restore proper
value as needed and while the water
in the system is cold.
Boiler pressure gauge indicates
water pressure in the system.
WARNING
After long boiler inactivity, its
pump may be stuck.
BEFORE STARTING UP THE
BOILER, MAKE SURE THAT THE
PUMP IS OPERATIVE, BY THE
FOLLOWING PROCEDURE:
Unscrew the protective bolt, loca-
ted in the centre front section
of pump motor. Put a screwdri-
ver into the hole and manually
rotate the circulation unit shaft
clockwise.
Once the unblocking operation
is completed, screw back on the
protection bolt and check for
water leaks.
WARNING
When the pump protective bolt is
removed, some water may flow
out. Before re-installing the boiler
external housing, verify all inter-
nal surfaces to be dry.
3.4 Starting the boiler
3.4.1 Preliminary checks
Before starting the boiler it is
necessary to perform the following
checks:
- Flue gas exhaust pipe and terminal
are installed as instructed: when the
boiler is running no products genera-
ted by combustion are to leak from
any gasket.
- Supply power to the boiler is to be
230 V – 50 Hz.
- The system is properly filled with
water (pressure reading on water
gauge has to be 0.8 / 1 bar).
- All system pipes stopcocks are
open.
- The gas type supplied to the boiler
corresponds to that for which the
boiler is set. Convert the boiler if
needed following the “ADAPTATION
FOR OTHER GASES AND BURNER
ADJUSTMENT” section instruction (§
3.6). This operation must be carried
out by qualified technical personnel.
- The gas supply stopcock is open.
- There are no gas leaks.
- The external power main switch
is on.
- The boiler safety valve is not bloc-
ked.
- There are no water leaks.
- The pump is not blocked.
WARNING
The boiler is delivered with the pump
speed set to 3.
3.4.2 Switching on and switching
off
For boiler starting up and switching
off procedure, follow “Instruction for
the user” (§ 1).
pic. 20a
pic. 20
Closed
By-pass
Open
By-pass