TEMPRA 24
29
5. ADJUSTMENT AND GAS CONVERSION
5.01 Adjusting the pressure and flow rate to the main burner
This boiler operates on the fl ame modulation principle. It has two fi xed 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 effi cient 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 (clockwise).
- Operate boiler for central heating
- Adjust minimum pressure by rotating screw «D»
clockwise toreduce pressure and anticlockwise to
increase pressure.
- Adjust potentiometre P3 at maximum (anti-
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».
M Minimum possible gas pressures are now
set. Range Rating the central heating is not necessary
(see paragraph 5.04).
Key
A =
Gas inlet test point
B =
Gas outlet test point
C =
Protection cup
D =
Min. pressure adjusting screw
E =
Max. pressure adjusting screw
F =
Balancing tube
IN
OUT
C
F
E
B
A
D
Fig. 27
