4.1
FILLING THE WATER SYSTEM
– Loosen the automatic air vent cap (10 fig. 2).
– Open all radiator valves and system air vents. Close all air
vents. Do not close the A.A.V. the one near the pump!
– Check the system for water soundness.
– Completely drain the appliance and heating system, thorough-
ly 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. 13).
– 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 pres-
sure). If it is necessary to adjust the D.H.W. burner pres-
sure 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 D.H.W. inlet valve and check that the burner pressure
decreases in response to D.H.W. temperature rise. Fully
open the inlet valve.
– Close the D.H.W. tap and ensure that the burner is extin-
guished and the pump stops.
4.3
SETTING THE C.H. INPUT
– Turn the rotary switch to the WINTER position “
❄
" and
ensure that the room thermostat (if fitted) is calling for
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 4.
– 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. 14). 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 see the user instructions.
4.4
SETTING THE D.H.W. FLOWRATE
A restrictor nut is fitted into the diverting valve to reduce the
D.H.W. flow to that which will give an acceptable D.H.W. tem-
perature. To set the D.H.W. flow, procede as follows:
– select Summer position “
” and turn the D.H.W. thermo-
stat to max.;
– fully open the D.H.W. tap furthest from the boiler;
– check that the boiler is firing at maximum burner pressure;
– adjust the D.H.W. flowrate by turning the restrictor lever
on the divertor valve until a D.H.W. temperature rise of
appr ox 35° C is achieved. This corr esponds t o t he
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 temperatures
of use of hot water, given in
Table 4, have been obtained by posi-
tioning 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 may need
cleaning.
To gain access to the filter, first close the cold water, 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.
12
4
COMMISSIONING AND TESTING
BURNER PRESSURE
TEST POINT
Fig. 13
1
6
KEY
1 “Heating output” trimmer
6 “Ignition pressure” trimmer
NOTE: To gain access to trimmers (1) and (6),
take off the central heating potentiometer knob.
Fig. 14
Summary of Contents for FORMAT 34E BF
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