Sime Planet AquaQuick 25 BF Installer'S Instructions Download

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4.1

ADJUSTMENT OF
D.H.W. FLOW RATE

To  adjust  the  hot  water  flow  rate,  use  the
flow-rate  regulator  on  the  pressure  switch
valve (7 fig. 4).
Remember  that  the  flow  rates  and  corre-
sponding temperatures of use of hot water,
given in section 1.3, have been obtained by
positioning  the  selector  of  the  circulation
pump on the maximum value.
Should there be any reduction in the D.H.W.
flow  rate,  the  filter  installed  on  the  inlet  to
the pressure switch valve (3 fig. 4) will need
cleaning.
This may be accessed only after closing the
cold water on/off cock on the fixing jig

4.2

GAS VALVE

The  boiler,  is  equipped  standard  with  the
HONEYWELL  VK8105N  gas  valve  (fig.  20)
set  at  two  pressure  values:  maximum  and
minimum.
According  to  the  type  of  gas  burnt,  these
correspond  to  the  values  given  in

Table 5

The gas pressures at the maximum and
minimum values, are factory set.
Consequently they must not be altered.
Only when you switch the appliance from
one type of gas supply (methane) to another
(butane or propane), it is permitted to alter
the operating pressure.

It  is  essential  that  this  operation  is  car-
ried  out  exclusively  by  authorized  techni-
cal staff.
When  the  working  pressures  have  been
adjusted, reseal the regulators.

When the gas pressures are to be reset,
this must be done following a set order: first
the MAXIMUM and then the MINIMUM.

4.2.1

Maximum and minimum
pressure adjustment

(fig. 21)

To set the minimum pressure, proceed as
follows:
– Connect the pressure column or a pres-

sure gauge to the pressure inlet down-
stream of the gas valve. In the

“30 BF”

versions, instead, connect the manome-
ter as shown in fig. 20/a.

– 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 by operating the swit-

ch and open the D.H.W. tap at a high
flow rate.

– Using a 9 spanner, turn the nut (3) to

achieve the maximum pressure value
given in

Table 5

: 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. tap open all
the time, and check that the pressure
corresponds to the values given in

Table 5

After  having  adjusted  the  maximum  pres-
sure,  calibrate  the  minimum  pressure  as
follows:
– Disconnect  the  electric  power  of  the

modulator.

– With the domestic hot water potentio-

me t er  knob  on  t he  maximum,  t he
domestic  hot  water  tap  open  and  the
burner  ignited,  using  a  7  spanner  turn
the nut (2) to get the minimum pressu-
re value given in

Table 5

: to reduce the

pressure, turn the nut counterclockwi-
se; to increase the pressure, turn it
clockwise.

– Operate the main switch a number of

times,  keeping  the  D.H.W.  tap  open  all
the  time,  and  check  that  the  pressure
corresponds  to  the  values  given  in

Table 5

– Connect up the power supply to the

modulator again.

– Deplace the plastic cap (1).

USE AND MAINTENANCE

Fig. 21

KEY
1 Plastic cap
2 Minimum pressure adjusting nut
3 Maximum pressure adjusting nut