Sime super mk.ii Installation And Servicing Instructions Download Page 18

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SIME SUPPORT THE BENCHMARK INITIATIVE

All relevant sections of the logbook must be filled in at the
time of installation and thereafter service information on the
back page of the logbook. Commissioning of the boiler is not
complete until the logbook is filled in.

Before commissioning the appliance, the whole gas installa-
tion including the meter MUST be purged and tested for gas
soundness in accordance with BS6891.

IMPORTANT: open all doors and windows, extinguish naked
lights, and DO NOT SMOKE whilst purging the gas line.
Before commencing the commissioning procedure, ensure
that the gas service cock is turned on, the electricity sup-
ply is isolated, and that the D.H.W. and C.H. isolation valves
are in the closed position.

4.1

FILLING THE WATER SYSTEM

– Open the C.H. flow and C.H. return valves (17 and 18 fig. 2).
– Loosen the automatic air vent cap (9 fig. 2).
– Open all radiator valves and system air vents. Fill the sys-

tem with water using one of the approved methods
described in section 2.9 to about 0.5 bar greater than the
system design pressure. Close all air vents. Do not forget
the one near the pump!

– Check the system for water soundness.

– Completely drain the appliance and heating system,

thoroughly flush the system, and refill the system design
pressure.

– Open the D.H.W. inlet valve, open any hot tap, clear of air

bubbles. Close hot tap.

4.2

COMMISSIONING THE BOILER

– Remove the screw and connect a pressure gauge to the

burner pressure test point on the gas valve (fig. 20 “SIT gas
valve Tandem 837” - fig. 20/a “SIT gas valve Sigma 845”).

– Ensure that the rotary switch on the facia panel is set to the

SUMMER position “

” (D.H.W. Only), turn the D.H.W. ther-

mostat to maximum (fully clockwise), and turn on the electri-
cal supply. Fully open any D.H.W. tap and the burner will light.

– Allow the boiler to run for at least 5 minutes and check

that the burner pressure is as stated in section 1.3.
The D.H.W. burner pressure is factory set and should not
require adjusting. If the burner pressure is low, check that
the appliance has not begun to modulate (this will occur if
the D.H.W. flow rate is low. If modulation is suspected,
open all D.H.W. taps to maximise flow and recheck burner
pressure).Check also the inlet pressure with the burner
alight; this should be 20 mbar (8 in.wg) +/- 2.5 mbar (1
in.wg) for natural gas. If it is necessary to adjust the D.H.W.
burner pressure the method is described in section 8.6.

– Reduce the D.H.W. draw off rate to the minimum neces-

sary to maintain the burner alight by carefully adjusting the

– Carry out electrical system checks through a suitable test

meter: earth continuity, polarity, resistance to earth and
short circuit.

– Re-secure control box.

3.11

TIME-CLOCK INSTRUCTIONS

Setting the time

Turn the programming dial in clockwise direction to set the
read off the 24-hour dial opposite the marking.

Program setting

Press inwards the segments on the program disk corre-

sponding to the selected switching periods.