Unical DUA plus 30 mtank, Инструкция по установке и эксплуатации пользователя

Страница: 21 / 28

21
fig. 13
MP =
pressure test nipple
MP
MODULATING COIL
fig. 21
2.6 - ADJUSTING THE
BURNER
All the instructions below are for the
exclusive use of
qualified technicians.
All the boilers leave the factory adjusted
and tested.
If it is necessary to change the adjustment
due to changes in the gas or adaptation to
the supply network conditions, it will be
also necessary to re-adjust the gas valve.
Attention: during this re-adjustment
do not draw any Domestic Hot Water.
For this reason it’s necessary to know the
boiler operation in
service mode.
In order to activate this function, push and
keep hold the
service push button, on the
control panel, for 3 seconds: the service
mode green led will be continuously
.
lighted
( continuous)
and the boiler
will operate at the maximum capacity. Then
push once again the same button: the
service mode green led will start blinking
( blinking)
. The service mode
function remains active for 15 minutes.
For cleaning this function before this fixed
period, push the reset button: the
service
mode led will switched off
( off).
.
To correctly adjust the gas valve, follow the
steps below:
A) Maximum output adjustment
- check the value of the supply pressure
(see table NOZZLES - PRESSURES);
- Remove the cover (A) protecting the
pressure regulator on the top of the
modulating coil.
- Connect a manometer at the outlet gas
valve pressure nipple.
- Activate the service mode function to
the maximum capacity (service mode led
continuous lighted).
- When the burner is ON, check that the
“MAXIMUM” pressure value corresponds
to that indicated on the table “NOZZLES -
PRESSURES”:
- Correct, eventually, the value rotating the
nut “C” with a 10 mm open wrench (fig.21):
by clockwise rotation the gas pressure
increases,
by anticlockwise rotation the gas pressure
decreases.
B)
Minimum output adjustment
- Operate the boiler in service mode at
minimum output (service mode led
blinking).
-
When the burner is ON, check that the
“MINIMUM” pressure value corresponds
to that shown on the table “NOZZLES
PRESSURES”:
- By holding the nut “C” with a 10 mm
open wrench, adjust, eventually, the value
rotating the screw "B" (fig.21):
by clockwise rotation the gas pressure
increases,
by anticlockwise rotation the gas pressure
decreases.
GAS VALVE
Adjust the min.
output and hold the
nut ''C'' with a
10 mm wrench to
avoid its
misadjustment and
act with a cross
screw driver onto
the ''B'' screw.
A
B = Minimum
pressure
adjust. screw
(red)
C = Maximum
pressure
adjust. nut
(wrench 10 mm)
Adjustment of
max output
Nut ''C'' with
10 mm wrench
Outlet
pressure
test nipple
Outlet
pressure
test nipple
C)
) Ending of basic adjustments
- check the min. and max. pressure values
of the gas valve by acting the service mode
- if necessary make any fine adjustments
- Clear the service mode service mode service mode service mode service mode function by
pushing the reset button or switching off.
- Remove the plastic pipe from pressure
test nipple and close the inner screw;
-
Use soap solution tocheck for gas
leaks.
PRESSURE TEST NIPPLE
OPERATION AT THE
MAXIMUM CAPACITY
MIN - MAX
OPERATION AT THE
MINIMUM CAPACITY
MIN - MAX
CHIMNEYSWEEPER
DE ACTIVATION
(BEFORE 15 MIN)
MIN - MAX