Adjustment And Gas Conversion - Fer FALCON II Installation, Servicing & User Instructions

• Check that the domestic hot water flow and T correspond to the table. Do not rely on empirical measurements.
Temperature should be measured using thermometers as near as possible to the boiler, bearing in mind
the heat loss from the pipes.
• Check that the gas valve modulates correctly both during the central heating phase and the domestic hot
water production phase.
• To determine combustion efficiency and the composition of the flue gases (refer to 6.04)
• If any of the above are not correct refer to Technical Data (page 5). Adjustment (refer to 5) and Fault
finding (page 31).

5. ADJUSTMENT AND GAS CONVERSION

5.01 Adjusting the pressure and flow rate to the main burner
This boiler operates on the flame modulation principle. It has two fixed pressure values, minimum and maximum,
which must be as shown in the table (pages 5), whichever type of gas is used.
Note - Because correct minimum and maximum pressures are critical to the efficient operation of the boiler it is ESSENTIAL
that the following adjustments are carried out by COMPETENT personnel ONLY.
5.02 Adjusting minimum and maximum pressure Honeywell V K4105G gas valve
- Connect suitable pressure gauge to burner test point "B" downstream of the gas valve.
- Disconnect the pressure compensation tube «F».
- Remove the protective cap «C».
- Adjust potentiometre P3 (on the main board) at minimum
(anticlockwise).
- Operate boiler for central heating
- Adjust minimum pressure by rotating screw «D» clockwise to
reduce pressure and anticlockwise to increase pressure.
- If it is not possible to achieve the right pressure adjust minimum
pressure by potentiometer P5
- Adjust potentiometre P3 at maximum (clockwise)
- Adjust max pressure by rotating screw «E», clockwise to
increase pressure and anticlockwise to reduce pressure.
- Reconnect the pressure compensation tube «F».
- Replace protective cap «C».
Maximum + Minimum possible gas pressures are now set. Range
Rating the central heating is not necessary (see paragraph
5.04).
Legenda
A = Gas inlet test point
B = Gas outlet test point (burner pressure)
C = Protection cap
D = Min. pressure adjusting screw
E = Max. pressure adjusting screw
F = Balancing tube
22
FALCON II
F
C
E B A D
Fig. 21