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15.7 Ignition fan ramp. The graduated
opening of the gas valve for ignition rate is
governed by the 1
which is factory set to 4 o'clock. Adjustment
from minimum to maximum rate is made by
turning the potentiometer fully clockwise.
15.8 The boilers integral pump is factory set
to its maximum speed setting to give a 1000
l/hr flow on a nominal 4m head. The pump
may be adjusted to a lower speed to match the
designed
(figure 22)
Important .
Dip Switch 4 and Dip Switch 5 (figure 19) are
factory set and must not be adjusted.
24
16. Safety Devices
16.1 An hydraulically operated primary
pressure sensor monitors water pressure in the
primary hydraulic circuit and will flash should
the pressure drop below 0.8bar, and switch off
the boiler if the pressure drops below 0.3bar or
rises above 3bar. The boiler will not operate
until the correct system pressure has been
correctly re-stored and the boiler reset, see
13.2.
16.2 The temperature of the water flowing
from the primary heat exchanger is monitored
by an overheat thermostat located on the outlet
pipe. If the water temperature gets too hot the
switch opens, cutting off the electrical supply
to the gas valve and causing the boiler to
'Lock-out'. Once activated the boiler has to
be manually re-set. Refer to section 13.2.
st
potentiometer P7 control,
c/heating
system
requirements.
16.3 The boiler's control unit has an in-built frost
protection device that fires the boiler's burner
when the temperature of the primary hydraulic
water falls below 6°C. The device works
irrespective of any room thermostat setting and
will protect the complete heating system. Once the
water temperature reaches 16°C the boiler reverts
back to normal operation.
16.4 If there is a fault on the DHW sensor, the
boiler continues to operate by controlling DHW
outlet temperature by using the CH temperature
sensor, which limits the water temperature at 65ºC
during DHW operation. If such a failure occurs a
fault code will be displayed on the LCD display,
please contact your service agent.
17. Routine Servicing
17.1 To ensure the continued efficient and safe
operation of the boiler it is recommended that it is
checked and serviced regularly. The servicing
must be carried out by a competent person in
accordance with the Gas (Safety and Use)
Regulations. The frequency of servicing will
depend upon the particular installation conditions
and usage, but in all cases the boiler must be
serviced at least once a year.
17.2 Following servicing of the boiler the relevant
sections
of
the
Commissioning and Servicing Log Book must be
completed.
17.3 Prior to servicing check the flue operation,
terminal guard (if fitted) and the boilers operation.
17.4 Ensure that both the electrical and gas
supplies to the boiler are isolated before
commencing service of the boiler.
17.5 Remove the boiler casing as follows:
Open the front panel by removing two screws
at the bottom of the boiler (figure 23).
Page 24
solaris 24PC, 30PC
'Benchmark'
Installation,
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