Setting The C.h. Input; Setting The D.h.w. Flowrate; Final Checks; User's Instructions - Sime benchmark FRIENDLY FORMAT Installation And Servicing Instrucnions

heat. Turn the C.H. thermostat knob to maximum (fully
clockwise) and the burner will light.
– Allow the boiler to run for at least 5 minutes and check
the burner pressure. The heating input is factory set as
stated in Table 3 .
– If the heating output is to be adjusted, proceed as follows:
– refer to section 1.3 and establish the desired burner
pressure;
– remove (pull forwards) the C.H. knob protecting the
potentiometer;
– set the burner pressure as required using a small
screwdriver on potentiometer (1 fig. 21). Rotate the
screw anti-clockwise to reduce the burner pressure;
– operate the rotary switch between SUMMER and WIN-
TER position a few times and check that the correct
burner pressure is maintained.
– Replace the C.H. knob over potentiometer.
– To set the time clock ("80 E - 100 E" models only) pro-
ceed as follows:
– push in the setting tabs around the clock dial at the
times corresponding to when the heating is desired ON;
– set the clock to the correct time by rotating the dial clock-
wise until the arrow corresponds to the current time.
C
KEY
1 "Heating output" trimmer
6 "Ignition pressure" trimmer
NOTE: To gain access to trimmers (1) and (6),
unscrew the central heating potentiometer knob.
4.4

SETTING THE D.H.W. FLOWRATE

A restrictor lever is fitted into the diverting valve to reduce
the D.H.W. flow to that which will give an acceptable D.H.W.
temperature. To set the D.H.W. flow, procede as follows:
– select Summer position "
stat to max.;
– fully open the D.H.W. tap furthest from the boiler;
– check that the boiler is firing at maximum burner pressure;
Fig. 20
6
1
Fig. 21
" and turn the D.H.W. thermo-
BURNER PRESSURE
TEST POINT
– adjust the D.H.W. flowrate by turning the restrictor lever
on the divertor valve until a D.H.W. temperature rise of
approx 35° C is achieved. This corresponds to the
flowrates shown in Table 4 ;
– turn off the tap;
– remove the pressure gauge and refit the sealing screw;
Remember that the flow rates and corresponding tempera-
tures of use of hot water, given in Table 4 , have been obtained
by positioning the selector of the circulation pump on the max-
imum value.
Should there be any reduction in the D.H.W. flow rate, the
filter installed on the inlet to the pressure switch valve will
need cleaning. To gain access to the filter, first close the
cold water isolation valve (19, figure 2), drain the D.H.W.
circuit via the lowest tap, make provision to collect a small
discharge of water, then loosen the brass swivel connec-
tion to access the filter.
4.5

FINAL CHECKS

– Re-light and test for gas soundness.
– Re-fit the casing front panel and securing brackets.
– Set the C.H. and D.H.W. potentiometers to the required
settings.
– Ensure that the time clock ("80 E - 100 E" models only) is
set at the desired time periods. Set the room thermostat
(if fitted) to the required setting.
4.6

USER'S INSTRUCTIONS

Upon completion of commissioning and testing the system,
the installer should:
– Give the "Users Instructions" to the householder and
emphasise their responsibilities under the "Gas Safety
(Installation and Use) Regulations 1996 (as amended)".
– Explain and demonstrate the lighting and shutdown proce-
dures.
– Advise the householder on the efficient use of the system,
including the use and adjustment of all system controls
for both D.H.W. and C.H.
– Advise the user of the precautions necessary to prevent
damage to the system, and to the building, in the event of
the system remaining inoperative during frost conditions.
– Explain the function of the boiler overheat thermostat, and
how to reset it. Emphasise that if cut-out persists, the boil-
er should be turned off and the installer or service engi-
neer consulted.
– Stress the importance of an annual service by a regis-
tered heating engineer.
Fig. 20/a
15