Immergas 3.018921, Instruction And Warning Booklet

5

INS

TALLER

US

ER

MAINTEN

AN

CE TECHNI

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1.2  MAIN DIMENSIONS.

Fig. 1-2

Key:

  G  -  Gas supply

 AC  -  Domestic hot water outlet

  AF  -  Domestic cold water inlet 

  R  -  System return

  M  -  System flow

  V  -  Electrical connection

N.B.:   connection group (optional)

Height (mm) Width (mm) Depth (mm)

785

450

310

CONNECTIONS

GAS

DOMESTIC 

HOT WATER

SYSTEM

G

AC

AF

R

M

3/4”

1/2”

1/2”

3/4”

3/4”

1.3  CONNECTIONS (OPTIONAL).

Gas connection (appliance category II

2H3+

).

Our boilers are designed to operate with methane 

gas (G20) and LPG. Supply pipes must be the 

same as or larger than the 3/4”G boiler fitting. 

Before connecting the gas line, carefully clean 

inside all the fuel feed system pipes to remove any 

residue that could impair boiler efficiency. Also 

make sure the gas corresponds to that for which 

the boiler is prepared (see boiler data-plate). 

If different, the appliance must be converted 

for operation with the other type of gas (see 

converting appliance for other gas types). The 

dynamic gas supply (methane or LPG) pressure 

must also be checked according to the type 

used in the boiler, which must comply with the 

regulations in force, as insufficient levels can 

reduce generator output and cause malfunctions.

Ensure correct gas cock connection by following 

the mounting instructions illustrated in the 

figure. The gas supply pipe must be suitably 

dimensioned according to current regulations 

in order to guarantee correct gas flow to the 

burner even in conditions of maximum generator 

output and to guarantee appliance efficiency 

(technical specifications). The coupling system 

must conform to standards.

Fuel gas quality.

 The appliance has been 

designed to operate with combustible gas free of 

impurities; otherwise it is advisable to fit special 

filters upstream of the appliance to restore the 

purity of the fuel.

Storage tanks (in case of supply from LPG 

depot).

- New LPG storage tanks may contain residual 

inert gases (nitrogen) that degrade the mixture 

delivered to the appliance casing functioning 

anomalies.

- Due to the composition of the LPG mixture, 

layering of the mixture components may occur 

during the period of storage in the tanks. This 

can cause a variation in the heating power of 

the mixture delivered to the appliance, with 

subsequent change in its performance.