Immergas 3.018921, Instruction And Warning Booklet

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1.9  SYSTEM FILLING.

Once the boiler is connected, proceed with 

system filling via the filling valve (Fig. 2-2). 

Filling is performed at low speed to ensure 

release of air bubbles in the water via the boiler 

and heating system vents. The boiler has a built-

in automatic venting valve on the circulator. 

Open the radiator vent valves. Close radiator 

vent valves when only water escapes from them.

Close the filling valve when the boiler pressure 

gauge indicates approx. 1.2 bar.

N.B.:

 during these operations start up the 

circulation pump at intervals, acting on the main 

switch positioned on the control panel. 

Vent the 

circulation pump by loosening the front cap and 

keeping the motor running.

Tighten the cap after the operation.

1.10 GAS SYSTEM START-UP.

To start up the system, make reference to the 

Standard: This divides the systems and therefore 

the start-up operations into three categories: new 

systems, modified systems, re-activated systems. 

In particular, for new gas systems:

- open windows and doors;
- avoid presence of sparks or open flames;
- bleed all air from the pipelines;
-  check that the internal system is properly sealed 

according to specifications.

1.11 BOILER START-UP (IGNITION).

To issue the required Declaration of Conformity, 

the following must be performed for boiler 

start-up:

-  check that the internal system is properly sealed 

according to the regulations in force;

-  make sure that the type of gas used corresponds 

to boiler settings;

-  switch the boiler on and check correct ignition;
- make sure that the gas flow rate and relevant 

pressure values comply with those given in the 

manual (par. 3.16);

- check the correct ventilation of the rooms;
- check the existing draught during normal 

functioning of the appliance, e.g. a draught 

gauge positioned at the exit of the appliance 

combustion products;

-  check that there is no backflow of combustion 

products into the room, even during 

functioning of fans;

- ensure that the safety device intervenes in the 

event of gas supply failure and check the relative 

intervention time;

- check activation of the main switch located 

upstream of the boiler.

The boiler must not be started up even if only 

one of the checks should be negative.

Fig. 1-7

Head available to the system.

1.12 CIRCULATION PUMP.

The boilers are supplied with a built-in circulation 

pump with 3-position electric speed control.

The boiler does not operate correctly with the 

circulation pump on first speed. 

To ensure optimal boiler operation, in the case 

of new systems (single pipe and module) it is 

recommended to use the pump at maximum 

speed. The circulation pump is already fitted 

with a capacitor.

Pump release.

 If, after a prolonged period of 

inactivity, the circulation pump is blocked, 

unscrew the front cap and turn the motor shaft 

using a screwdriver. Take great care during this 

operation to avoid damage to the motor.

1.13 KITS AVAILABLE ON REQUEST.

• System cut-off valves kit (on request). The 

boiler is designed for installation of system 

interception cocks to be placed on flow and 

return pipes of the connection assembly. This 

kit is particularly useful for maintenance as 

it allows the boiler to be drained separately 

without having to empty the entire system.

• Zone system 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 flow rate high 

for each zone, Immergas supplies zone system 

kits by request. 

• Polyphosphate dispenser kit (on request). 

The polyphosphate dispenser reduces the 

formation of lime-scale and preserves the 

original heat exchange and domestic hot water 

production conditions. The boiler is prepared 

for application of the polyphosphate dispenser 

kit.

The above-mentioned kits are supplied complete 

with instructions for assembly and use.

Flow rate (l/h)

H

ea

d (kP

a)

  A  =  Head available to the system at 

maximum speed with by-pass 

excluded.

  B  =  Head available to the system at 

maximum speed with by-pass 

inserted.

  C  =  Head available to the system 

at second speed with by-pass 

excluded.

  D  =  Head available to the system 

at second speed with by-pass 

inserted.

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