Ferroli XIGNAL CE Technical Information Installation And Service Instructions page 25

Honeywell VR 4600 N 4002 valve with V7335A4014 Modureg
1 - With the burner lit:
2 - Connect suitable pressure gauge to burner test point "B", and then:
3 - Disconnect air pressure compensation tube "H";
Disconnect the wires from coil "C" of the Modureg;
4 -
5 - Remove protective cover "D";
Remove coil "C" by opening the coupling spring "I";
6 -
7 - Screw the minimum adjustment screw "E" up tightly. (clockwise)
8 - Unscrew lock nut "F" on sleeve "G";
9 - Adjust maximum pressure by rotating sleeve "G" clockwise to increase
pressure and anticlockwise to reduce pressure;
10 - Tighten sleeve lock but "F" then check that the pressure
is still at the required value;
11 - Adjust minimum pressure by rotating screw "E" anti-
clockwise until the required value is reached;
12 - Fit coil "C" by sliding it into the sleeve, pushing and
rotating it lightly until the coupling spring "I" clicks into
place;
13 - Shut down and ignite the burner, checking that the
minimum pressure value is stable;
14 - Reconnect the wires to coil "C" of the Modureg;
15 - Reconnect air pressure compensation tube "H";
16 - Replace protective cover "D";
17 - Turn burner off, remove pressure gauge, close and test,
test point;
Key
A Test point inlet pressure - B Burner test point - C Coil -
D Protective cover - E Minimum adjustment screw - F Lock nut
- 0G Sleeve - H Pressure compensation tube - I Coupling
spring - L Adapter (for only L.P.G. version)
Adjustment of the heating
Heat variation ∆t (temperature difference in the heating water between the supply and return points of
the system) must be less than 20°C. This is obtained by varying the flow rate head of the circulator using
the multi-speed variator (or switch) of the same. The ∆t value decreases when the speed of the circulator
is increased, and vice versa.
Boiler pressure adjustment
The pressure of the water in the heating plant, indicated by the control panel display, must be regulated
as described in the relative paragraph.
Gas pressure Adjustment
∆
t by varying the circulator flow rate-head
I
H
A
L
B
D
C
E
G
F
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