Manual Calibration Function; Aeration Function; Changing The Type Of Gas - UTICA BOILERS MAHF-75 Installation, Operation And Maintenance Manual

9 .9 M a nua l Ca libra t ion Funct ion:
Manual Calibrat ion phase st art s at t he end of t he
Aut om at ic Calibrat ion.
The Display shows t he boiler power and adj ust m ent
of t he CO2 value ( param et er set t ing) during Manual
Calibrat ion sequence.
The process begins at m inim um power.
A. Aft er Aut om at ic Calibrat ion sequence wit h
flashing together on the display, you can adjust
m inim um power com bust ion by pressing
lower % CO , and
2
B. When m inim um power com bust ion is in t he
specified range, press
ignit ion power.
C. Press t o adj ust ignit ion power com bust ion.
Press t o lower % CO
D. When ignition power combustion is in the specified
range, press and t hen
power.
E. Press t o adj ust m axim um power com bust ion.
Press t o lower % CO
F. When m axim um power com bust ion is in t he
specified range, press
Funct ion. ESC is displayed on t he screen.
I M PORTAN T I N FORM ATI ON
A. I f display shows fault E1 1 8 ( low pressure in
hydraulic circuit) open filling tap on appliance and
rest ore correct pressure.
B. I f gas recognit ion funct ion is int errupt ed due
t o fault ( e.g.: E1 3 3 no gas) press
reset . Then press
6 seconds) t o rest art t he funct ion again.
I f gas recognit ion funct ion is int errupt ed due t o
overheat ing, rest art funct ion by pressing and
holding down t oget her for at least 6 seconds.
C. Com bust ion of t his appliance is fact ory default for
operat ion t o Nat ural gas.
D. Type is being est ablished.
9 .1 0 De- Aera t ion Funct ion
Used t o elim inat e air inside t he heat ing circuit when
boiler is inst alled or aft er m aint enance when wat er is
drained from prim ary circuit .
1.
Press but t ons
seconds. On appears on display for a few seconds,
followed by program row 3 1 2 .
The electronic board will activate pump on/off cycle
2.
for 10 m inut es. Funct ion will aut om at ically st op at
end of cycle.
3.
To m anually exit t his funct ion, press
but t ons t oget her and hold for 6 seconds.
9 - START U P PROCED U RE
t o raise % CO .
2
and t hen t o reach
, and t o raise % CO
2
t o reach m axim um
, and t o raise % CO
2
t o exit Manual Calibrat ion
t o
and ( for at least
t oget her and hold for 6
FI GURE 9 - 3 - Ga s I nlet Ta p - Pi
t o
PI = Gas Supply I nlet Pressure Tap
9 .1 1 Cha nging The Type Of Ga s
I f change of gas t ype is required a ft e r first installation:
.
• Change param et er P02. See sect ion 9.6
2
Com m ission in g and se ct ion 9 .1 5 Param et er
Set t ings.
• Check m inim um gas pressure is suitable for selected gas:
Minim um gas pressure is determ ined with boiler operating
at high fire and any other appliances connected to same fuel
.
2
source operational as well ( whole house load)
Gas A ( NG) = 3.5" ( 8.7 m bar)
Gas E ( LPG) = 8.0" ( 19.9 m bar)
• Place supplied label wit h indicat ion of gas t ype
close t o t he dat a plat e of boiler replacing t he original.
• Perform Aut om at ic Calibrat ion Funct ion - Sect ion 9 .8 .
Manufacturer recommends verification of CO2
•
concentration on the flue.
5 2
PI
240013503 REV A, [ 03/ 15/ 2022]