Immergas HERCULES Condensing 26 2 E Manual page 31

Technical Documentation
Air-gas adjustments.
The calibration of the total premix combustion system, when
necessary envisions the adjustment of the nominal heat output
and the air-gas ratio (off-set).
The two operations are only normally requested after a gas
transformation, after extraordinary maintenance (replacement
of a component of the air-gas circuit, replacement of the integrated
P.C.B. etc.) or when the appliance is not calibrated.
N.B.: The nominal output must also be adjusted during
the initial check.
Adjustment of nominal and minimum heat output.
The availability of maximum output is linked to the length of
the intake and exhaust pipes which, increasing, slightly reduces
the amount (flow rate) of inlet air and consequently also la
pressure of the burnt gas.
The boiler is calibrated as per standard for functioning with
a Ø60/100 horizontal concentric kit with length of 1m and
therefore the use of the flue kit with greater head losses requires
a check and possible adjustment of the nominal output accord-
ing to the table give below.
Below find the default settings present on the boiler (length
1 m):
HERCULES Condensing 26 2 E
G20:
MIN. MAX.
5060 (rpm)
G20:
MIN SPEED
1240 (rpm)
G20:
MAX. TIMER
4700 (rpm)
G20:
MIN. TIMER
1240 (rpm)
HERCULES Condensing 32 2 I
G20:
MIN. MAX.
4700 (rpm)
G20:
MIN SPEED
1260 (rpm)
G20:
MAX. TIMER
4700 (rpm)
G20:
MIN. TIMER
1260 (rpm)
The operation must be performed as follows and with respect
to the values stated in the heat output adjustment table:
- connect a differential manometer to the pressure points P1
(positive point) and P2 (negative point) found in the upper
part of the sealed chamber (iin this way the pressure difference
at the ends of the Venturi pipes (P1-P2) is detected and a pres-
sure signal is measured that corresponds to the real flow rate of
the air-gas mixture at the burner).
- start the boiler in the chimney sweep phase by pressing
key "C" and then check maximum fan speed (with burner
ignited);
- after about 5 minutes check and, if necessary, modify the
maximum number of fan revs. in CH mode and in DHW
mode until a pressure value is obtained (P1-P2) correspond-
STHCkW ed 04/09
GPL:
4400 (rpm)
GPL:
ing to the nominal output.
1440 (rpm)
- to modify the maximum number of fan revs. enter the
GPL:
"Configurations" menu and inside the "BOILER PAR."
4100 (rpm)
item, modify the value of the "MAX SPEED" parameter as
GPL:
stated in the heat output adjustment table, until the pressure
1140 (rpm)
value (P1-P2) corresponding to the maximum heat output
is obtained.
- N.B.: for the 26 2 E version, the maximum number of revs.
GPL:
in CH mode is lower than the absolute maximum speed.
4200 (rpm)
- to modify the maximum number of fan revs. in CH mode,
GPL:
enter the "Configurations" menu and inside the "BOILER
1160 (rpm)
PAR." item modify the value of the "MAX CH" parameter
GPL:
as stated in the heat output adjustment table, until a pressure
4200 (rpm)
value is obtained (P1-P2) that corresponds to the maximum
GPL:
output in CH mode.
1160 (rpm)
29
Technical Documentation
P1
HERCULES Condensing Export
P2