Italtherm CITY CLASS 20 F, Service Manual, Page: 2 / 32

Green Heating Technology
2 SERVICE
Manual City Class F-FR
Table of Content
Available models � � � � � � � � � � � � � � � � � � � � � � � � � � 2
PCB code � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
PCB boiler combustion reset � � � � � � � � � � � � � � � � � � 4
Check list first ignition � � � � � � � � � � � � � � � � � � � � � � � 5
User guide
Access to the inside of the boiler � � � � � � � � � � � � � 7
Boiler internal components 20-25-30F � � � � � � � � � 8
Boiler internal components 20-25-30FR � � � � � � � � 9
Boiler internal components 35F � � � � � � � � � � � � � 10
Boiler internal components 35FR � � � � � � � � � � � � 11
Hydraulic diagram F � � � � � � � � � � � � � � � � � � � � � � 12
Hydraulic diagram FR � � � � � � � � � � � � � � � � � � � � � 13
Electrical diagram F � � � � � � � � � � � � � � � � � � � � � � 14
Electrical diagram FR � � � � � � � � � � � � � � � � � � � � � 15
Heating system filling and pressuring � � � � � � � � � � 16
Dismounting and mounting
DHW exchanger � � � � � � � � � � � � � � � � � � � � � � � � 19
Combustion components � � � � � � � � � � � � � � � � � 20
Gas valve calibration � � � � � � � � � � � � � � � � � � � � � 22
How to access the parameters � � � � � � � � � � � � � � 23
Parameters F-FR � � � � � � � � � � � � � � � � � � � � � � � � � 24
Info menù � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 26 Error history � � � � � � � � � � � � � � � � � � � � � � � � � � � � 27
Errors F-FR � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 25
Service function � � � � � � � � � � � � � � � � � � � � � � � � � 29
Pump diagram F � � � � � � � � � � � � � � � � � � � � � � � � � � 26
Pump diagram FR � � � � � � � � � � � � � � � � � � � � � � � � � 27
Technical Data
Technical boiler data F � � � � � � � � � � � � � � � � � � � � � 28
Technical boiler data FR � � � � � � � � � � � � � � � � � � � � 34
Available models
Model GAS type*
PCB configuration
code
City Class 20 F Max heat input 20 kW
G20
(G30/G31)
20120
(21120)
City Class 25 F Max heat input 25 kW
G20
(G30/G31)
20120
(21120)
City Class 30 F
Max heat input 30 kW
G20
(G30/G31)
20120
(21120)
City Class 35 F Max heat input 35 kW
G20
(G30/G31)
20120
(21120)
City Class 20 FR Max heat input 20 kW
G20
(G30/G31)
20130
(21130)
City Class 25 FR Max heat input 25 kW
G20
(G30/G31)
20130
(21130)
City Class 30 FR Max heat input 30 kW
G20
(G30/G31)
20130
(21130)
City Class 35 FR Max heat input 35 kW
G20
(G30/G31)
20130
(21130)
F
F
F
F
FR
FR
FR
FR