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INSTALLERUSER
MAINTENANCE TECHNICIAN
1.26 CIRCULATION PUMP.
e boilers are supplied with a variable speed
circulator pump.
During the heating stage the Auto and Fixed
operating modes are available.
• Auto (default): Automatic circulator pump
speed and proportional head: e automatic
circulator pump speed varies according to the
power emitted by the burner; the greater the
power, the greater the speed. Moreover, within
the parameter, one can also adjust the circulator
pump operating range by setting the maximum
speed “A3” parameter (adjustable from 5 to 9)
and the “A4” minimum speed parameter (adju-
stable from 5 to the max. set speed).
• Fixed (5 ÷ 9): by setting parameters “A3” and
“A4” at the same value, the pump operates at
constant speed.
N.B.: for the boiler to work properly, it is not
allowed to drop below the minimum value
indicated above.
In domestic hot water mode, the circulator pump
always runs at full speed.
Pump release. If, aer a prolonged period of
inactivity, the circulation pump is blocked, turn
the motor sha using a screwdriver. Take great
care during this operation to avoid damage to
the motor.
By-pass Regulation (part. 26 Fig. 1-29). e
boiler leaves the factory with the by-pass open.
If necessary, the by-pass can be regulated to
system requirements from minimum (by-pass
closed) to maximum (by-pass open). Adjust
using a at head screwdriver, turn clockwise
and open the by-pass, anticlockwise it is closed.
1.27 KITS AVAILABLE ON REQUEST.
• System shut-off valve kits with or without
inspection lter (on request). e boiler is
designed for installation of system interception
cocks to be placed on ow and return pipes
of the connection assembly. is kit is very
useful for maintenance because it allows to
empty just the boiler without having to empty
the entire system. Moreover, the version with
lter preserves the functioning characteristics
of the boiler thanks to its inspectionable lter.
• System zone control unit kit (on request). If
the heating system is to be divided into several
zones (max. three), in order to interlock them
with separate adjustments and to keep water
ow rate high for each zone, Immergas supplies
zone system kits by request.
• Polyphosphate dispenser kit (on request). e
polyphosphate dispenser reduces the formation
of lime-scale and preserves the original heat
exchange and domestic hot water production
conditions. e boiler is prepared for applica-
tion of the polyphosphate dispenser kit.
• Relay board (on request). e boiler is prepared
for the installation of a relay card that allows
to increase the features of the appliance and
therefore functioning possibilities.
• Cover kit (on request). If installed outdoors in a
partially protected place with direct air intake,it
is compulsory to mount the appropriate top
protection cover for the correct functioning
of the boiler and to protect it from adverse
weather conditions.
• Cycloidal lter kit (on request). e magnetic
cycloidal filter is able to detect the ferrous
residues present in the system's water. anks
to the two cocks in the kit, it facilitates main-
tenance by cleaning the lter without having
to empty the circuit.
e above-mentioned kits are supplied complete
with instructions for assembly and use.
Total head available to the system.
Head (kPa)
A+B = Head available with by-pass closed
B = Head available with by-pass open
C+D = Power absorbed by the pump with by-pass open (dotted area)
D = Power absorbed by the pump with by-pass closed (dotted area)
Circulator pump absorbed power (W)
Flow rate (l/h)
Speed 9
Speed 9
Speed 5
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