Manual Unical EVE 05 RTFS 24 (page 29 of 36) (English)

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Adjustment info

°C

Outlet pressure test nipple

fig. 27

2.6 - ADJUSTING THE

BURNER

All the instructions below are for the exclusive

use of qualified technicians.

All the boilers leave the factory calibrated and

tested.

If it is necessary to change the calibration fol-

lowing changes in the type of gas or adapta-

tion to the supply network conditions, it is

necessary to recalibrate the gas valve.

WARNING: During these steps do not draw

Domestic Hot Water.

For that reason it is necessary to know the

boiler operation in chimney-sweeper mode.

In order to activate this function, push and

keep depresses the reset push button for

3 seconds, on the control panel, then push

once again the same button: the display

symbols “F” and “L” will be lighted (F: blink-

ing – L: fixed) and the boiler will operate at

the maximum capacity. By pushing again

the reset push button: the display symbols

“F” and “L” will be lighted (F: blinking – L:

blinking) and the boiler will operate at the

minimum capacity. The chimney sweeper

function remains active for 15 minutes. For

cleaning this function before this fixed

period, switch OFF and ON the boiler.

To correctly regulate the gas valve, follow the

steps below:

1) Maximum output adjustment

- check the value of the supply pressure (see

table NOZZLES - PRESSURES);

- Remove the cover (A) protecting the pres-

sure regulator on the top of the modulat-

ing coil.

Connect a manometer at the outlet gas

pressure test nipple (fig. 28).

Activate the chimney sweeper function to

the maximum capacity (“F” blinking; “L”

fixed); when the burner is ignited, check

that the “MAXIMUM” pressure value cor-

responds to that indicated on the table

“NOZZLES - PRESSURES”:

- Correct eventually the value rotating the

nut “C” with a 10 mm wrench (fig. 28);

by rotating clockwise, the gas pressure

increases, anticlockwise the gas pressure

is reduced.

2) Minimum output adjustment

- Push a second time the reset push button

and the boiler will operate at the minimum

capacity (both leds F and L will blink).

- When the burner is ignited, check that the

MINIMUM pressure value corresponds to

that indicated on the table “NOZZLES –

PRESSURES, etc.

- Correct, eventually, the value rotating the

red screw “B” with a cross-screw driver or

a 6 mm wrench (fig. 28): by rotating

clockwise the gas pressure increases,

by rotating counter clockwise the gas pres-

sure decreases

GAS VALVE

CHIMNEYSWEEPER

ACTIVATION

OPERATION AT THE MAXI-

MUM CAPACITY

OPERATION AT THE MINI-

MUM CAPACITY

Push the reset

push button for 3

seconds

Push again the reset push

button; the symbol “F” (Cen-

tral Heating) blinks, the sym-

bol “L” (burner in operation) is

fixed.

Push again the reset push

button; the symbol “F” (Cen-

tral Heating) and the symbol

“L” (burner in operation) are

both blinking

fig. 28

Inlet

pressure

test nipple

B = Screw

(red) for

minimum

pressure

adjustment

C = Adjust-

ment nut (10

mm) for

maximum

pressure

3) Ending of basic adjustings

- check the minimum and maximum pres-

sure values of the gas valve;

- if necessary make any fine adjustments

- Clear the chimneysweeper function by cut-

ting off the voltage.

- Remove the plastic pipe from pressure test

nipple and close the inner screw;

- Using a soapy solution check for gas

leaks.

PRESSURE TEST NIPPLE

fig. 29

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Unical EVE 05 RTFS 24 Manual

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