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–Disconnect the electric supply of the

modulator.

–With the D.H.W. potentiometer knob on

the maximum value, the hot water cock
open and the burner alight, holding the
nut (3) blocked, turn the screw (2) to find
the minimum pressure value as shown in

Table 4

: to decrease the pressure turn

the nut anti-clockwise and to increase
the pressure turn the nut clockwise.

–Turn on and turn off the burner a few

times whilst keeping the hot water cock
constantly open and verify that the pres-
sure corresponds to the values fixed.

–Reconnect the electrical supply of the

modulator.

–Replace the plastic cap (1)

4.2.2

Maximum and minimum
pressure adjustment
HONEYWELL VK 4105M

(fig. 30)

To set the maximum pressure, proceed as
follows :
– Connect the pressure column to the pres-

sure inlet downstream of the gas valve.

–For the

“BF”

models connect the pressu-

re column as shown in fig. 28.

–Remove the plastic cap on the modula-

tor (1).

–Set the knob of the D.H.W. potentiome-

ter to the maximum value.

–Ignite the boiler and open the D.H.W. cock.
–Using a ø 9 spanner, turn the nut (3) to

achieve the maximum pressure value
given in

Table 4

: to reduce the pressure,

turn the nut counterclockwise; to increa-
se the pressure, turn it clockwise.

– Operate the main switch a number of

times, keeping the D.H.W. cock open all the
time, and check that the pressure corre-
sponds to the values given in

Table 4

After adjusting maximum pressure, pro-
ceed to calibrate minimum pressure:
– Disconnect the electric power supply

from the modulator.

– With the hot water potentiometer

knob set to the maximum, the hot
water tap turned on and the burner lit,
hold nut (3) locked in place and simulta-
neously turn nut (2) using a fixed ø 7

wrench to identify the minimum pres-
sure value shown in

Table 4

: turn the

nut anti-clockwise to reduce pressure
or clockwise to increase it.

–Turn the boiler on and off repeatedly

while keeping the hot water tap turned
on, checking that pressure corresponds
to the values shown in

Table 4.

–Connect up the power supply to the

modulator again.

–Replace the plastic cap (1).

4.3

ADJUSTMENT OF
HEATING OUTPUT

To regulate the heating output, modifying
the factory settings whose power value is
around 16 kW, it is necessary to work with
a screwdriver on the trimmer of the heating
power (1 fig. 22).
To increase the operating pressure turn the
trimmer in a clockwise direction, to decrea-
se the pressure turn the trimmer in an anti-
clockwise direction. To facilitate the search

for  the  adjusting  of  the  heating  power  the
diagrams  pressure/  heat  output  for  natu-
ral  gas  (methane)  and  butane  or  propane
gas are available (fig. 31).

4.4

CONVERSION TO ANOTHER GAS

For  the  functioning  with  butane  (G30)  or
propane  (G31)  gas,  a  kit  with  that  needed
for the conversion is supplied.
To  convert  from  one  gas  to  another  carry
out the following operations (fig. 32):

Fig. 29

KEY
1 Plastic cap
2 Minimum pressure

adjusting screws

3 Maximum pressure

adjusting nut

Fig. 30

KEY
1 Plastic lid
2 Minimum pressure

regulating nut

3 Maximum pressure

regulating nut