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SIT 845 GAS Valve
Key:
1 - Coil
2 - Minimum power adjustment screws
3 - Maximum power adjustment nut
4 - Gas valve outlet pressure point
5 - Gas valve inlet pressure point
6 - Protection hood
HE 30 COMBI INTERNAL circuit board
Key:
10 - Main selector
11 - Domestic hot water temperature trimmer
12 - Central heating temperature trimmer
13 - Line fuse 3.15AF
14 - Neutral fuse 3.15AF
15 - METHANE L.P.G. gas type selector
16 - RS232 computer interface
3.5 CHECKS FOLLOWING
CONVERSION TO ANOTHER TYPE
OF GAS.
out with a nozzle of suitable diameter for the
type of gas used and the settings are made at the
correct pressure, check that:
-
-
it is stable (does not detach from burner);
- the pressure testers used for calibration are
perfectly closed and there are no leaks from
the gas circuit.
N
.B.: all boiler adjustment operations must
be carried out by a quali ed Hunt Heating
service technician.
Burner adjustment must be carried out using
connected to the pressure socket located above
the sealed chamber and the gas valve pressure
gas for which the boiler is prepared.
3.6 POSSIBLE GAS ADJUSTMENTS.
• Adjustment of boiler nominal heat output (see
- Turn the domestic hot water selector knob (13
Fig. 2-1) to the maximum functioning position;
- open the domestic hot water cock in order to
prevent modulation intervention;
- adjust the boiler nominal power via the
brass nut (3), keeping to the maximum
pressure values stated in the tables of Par. 3.16
depending on the type of gas;
4
1
5
- by turning in a clockwise direction the heating
potential increases and in an anti-clockwise
direction it decreases.
• Adjustment of boiler minimum heat output
N.B.:
nominal pressure.
Adjustment of the minimum thermal input is
obtained by operating on the cross plastic screws
(2) on the gas valve maintaining the brass nut
blocked (3).
- Disconnect the power supply to the modulating
reel (just disconnect a faston); By turning the
screw in a clockwise direction, the pressure
increases, in an anti-clockwise direction it
decreases. On completion of calibration, re-
apply the power supply to the modulating coil.
power must be adjusted, must not be lower than
that stated in the tables in par. 3.16 depending
on the type of gas.
N.B.: to adjust the gas valve, remove the plastic
N.B.:
valve for adjustments.
Flashing lights
19
3.7 PROGRAMMING THE P.C.B.
3-3
for possible programming of several operation
parameters. By modifying these parameters
as described below, the boiler can be adapted
To access the programming phase, proceed as
follows: position the main switch on Reset for a
3
time between 15 and 20 seconds, LED 1 will start
2
At this point re-position the general selector
6
on (
).
When the programming phase has been
to choose the parameter to be set.
of the LEDs between 2 and 11 at the same time
as LED 1.
e selection is made by rotating the DHW
of the LED to the parameter, see the following
table:
List of parameters
Minimum CH output
Maximum CH output
Central heating ignitions timer
Heating power output ramp
Heating switch-on delay
request from Room thermostat
and Comando Amico Remoto
remote control
3-4
DHW thermostat
Pump functioning
Functioning gas
Relay 1 functioning
Relay 2 functioning
Relay 3 functioning
(12 Fig. 2-1) to Reset momentarily until the
LED relative to the parameter switches-o ,
then release.
Given the OK for selection, pass to the second
level where it is possible to set the value of the
temperature selector switch (14 Fig. 2-1).
has been selected, con rm the selection by
momentarily turning the main selector switch
onto Reset momentarily until the LED relative to
Programming mode is exited if no operation is
carried out for 30 seconds or if the main selector
setting" level.
For association of the LED to the relative value,
Fig.3-4a
see the following tables:
/ EXT
Flashing
LED (fast)
LED 2
LED 3
LED 4
LED 5
LED 6
LED 7
LED 8
LED 10
LEDs 11
and 2
LEDs 11, 2
and 3
LEDs 11, 2, 3
and 4
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