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Italtherm CITY CLASS 20 F, Service Manual, Page: 12 / 32

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Italtherm CITY CLASS 20 F Service Manual Download Page 12

Green Heating Technology

12

SERVICE

 

Manual

 

City Class F-FR

Hydraulic components F

1  Flue pressure switch
2  Flue hood
3  Expansion vessel
5  Safety thermostat on system flow
6  Temperature Sensor, system flow
7  Motorized 3-way valve
8  Automatic Venting Device 

(heating circuit, incorporated in the pump)

9  Safety valve 3 bar
10 Pump
11 Drain valve
12 Priority flow switch (with filter)
13 Loss of water pressure switch
14 Gas valve
15 DHW temperature sensor
16 System pressure gauge
17 Filling valve
18 By-pass (in-built in the 3-way valve hydraulic 

assembly)

19 DHW exchanger (thermally insulated)
20 Burner
21 Primary exchanger

22 Sealed chamber
23 Fan
30 Check valve

R  Heating return
M  Heating flow
C  Hot water outlet
F  Cold water inlet
G  Gas inlet

F

00355 00

M

22

23

18
17

21

20

13

10

8

3

9

11

1

7

6

5

2

14

19
15

30

R

M

C

F

G

12

16

Summary of Contents for CITY CLASS 20 F

Page 1: ...CITY CLASS Manual SERVICE ENG 20 F 25 F 30 F 35 F 20 FR 25 FR 30 FR 35 FR Green Heating Technology ...

Page 2: ...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 ...

Page 3: ...h is equal to 3rd digit of PCB Code on left corner of Control Panel i e 1 on picture for F model If boiler feels air pressure switch changing its status it sets 3rd digit to 1 If boiler feels Flues Thermostat contact closed it sets 3rd digit to 0 If boiler does not receive any feedback in a one minute it shows E72 Combustion Boiler error F FR Digits 1st 2nd 3rd 4th 5th Value Aestethic Gas Type Pow...

Page 4: ...ration Once replaced PCB or after PCB RESET procedure boiler has to be configured for model where it is mounted Display shows Turn knob at least for 3 4 of its total range This way is set Boiler Aesthetic which is equal to 1st digit of Configuration Code on left corner of Control Panel i e 2 on picture Display shows Turn knob or choosing value 2 and press RESET button for storing information This ...

Page 5: ...nt pressure with cold system temperature Ensuring air bleeding Checking tank connection only FR If tanF is not present be sure to connect the flow and return together with a pipe for ensuring the needed circulation Gas plant Checking inlet pressure Static Dynamic Avoiding gas leakage from the gas connection on the boiler Electric connection Checking correct electric supply 220 240V 15 10 50Hz Chec...

Page 6: ...he CH system During the CH temperature setting by rotating the knob it shows the temperature value changing in case of alarm it displays E during the setting reserved to the Technician it displays the chosen parameter ID number see PCB parameters settings technician menu Three digit display under the symbol Normally it displays the temperature of the hot water on boiler s outlet When the boiler is...

Page 7: ... to unhooF it from the tongues 4 and remove it f f unscrew the screw 5 then slide the control panel 6 upwards and overturn it downwards f f after the regulations close the boiler repeating everything in the other sense carefully hooking the casing 3 to the tongues 4 F FR some items of this picture not involved in the description could be different from the model that you are operating on ...

Page 8: ...Automatic Venting Device heating circuit incorporated in the pump 9 Safety valve 3 bar 10 Pump 11 Drain valve 12 Priority flow switch with filter 13 Loss of water pressure switch 14 Gas valve 15 DHW temperature sensor 16 System pressure gauge 17 Filling valve 18 By pass in built in the 3 way valve hydraulic assembly 19 DHW exchanger thermally insulated 20 Burner 21 Primary exchanger 22 Sealed cham...

Page 9: ...flow 6 Temperature Sensor system flow 7 Motorized 3 way valve 8 Automatic Venting Device heating circuit incorporated in the pump 9 Safety valve 3 bar 10 Pump 11 Drain valve 12 Loss of water pressure switch 13 Gas valve 14 System pressure gauge 15 By pass in built in the 3 way valve hydraulic assembly 16 Burner 17 Primary exchanger 18 Sealed chamber 19 Fan FR 13 14 12 11 15 7 17 18 19 16 6 5 3 7 5...

Page 10: ...atic Venting Device heating circuit incorporated in the pump 9 Safety valve 3 bar 10 Pump 11 Drain valve 12 Priority flow switch with filter 13 Loss of water pressure switch 14 Gas valve 15 DHW temperature sensor 16 System pressure gauge 17 Filling valve 18 By pass in built in the 3 way valve hydraulic assembly 19 DHW exchanger thermally insulated 20 Burner 21 Primary exchanger 22 Sealed chamber 2...

Page 11: ... Temperature Sensor system flow 7 Motorized 3 way valve 8 Automatic Venting Device heating circuit incorporated in the pump 9 Safety valve 3 bar 10 Pump 11 Drain valve 12 Loss of water pressure switch 13 Gas valve 14 System pressure gauge 15 By pass in built in the 3 way valve hydraulic assembly 16 Burner 17 Primary exchanger 18 Sealed chamber 19 Fan FR 13 14 12 11 15 7 17 18 19 16 6 5 3 7 5 6 4 8...

Page 12: ... 3 bar 10 Pump 11 Drain valve 12 Priority flow switch with filter 13 Loss of water pressure switch 14 Gas valve 15 DHW temperature sensor 16 System pressure gauge 17 Filling valve 18 By pass in built in the 3 way valve hydraulic assembly 19 DHW exchanger thermally insulated 20 Burner 21 Primary exchanger 22 Sealed chamber 23 Fan 30 Check valve R Heating return M Heating flow C Hot water outlet F C...

Page 13: ...ing Device heating circuit incorporated in the pump 9 Safety valve 3 bar 10 Pump 11 Drain valve 12 Loss of water pressure switch 13 Gas valve 14 System pressure gauge 15 By pass in built in the 3 way valve hydraulic assembly 16 Burner 17 Primary exchanger 18 Sealed chamber 19 Fan R Heating return M Heating flow RBReturn from storage coil MB Flow to storage coil G Gas inlet FR 00384 00 M R M RB MB ...

Page 14: ...no system pressure no flow Optional external devices TA Room thermostat or Chronothermostat SELV simple contact Closed contact heating request or Remote control original accessory only SE To optional outdoor temperature sensor Abbreviations COM Common NC Normally closed contact NO Normally open contact HEA Heating diverting command DHW Hot water diverting command Colours BF BlacF BN Brown BU Blue ...

Page 15: ... storage unit for details Optional external devices SP DHW Storage temperature Probe ST DHW Storage Thermostat TA Room thermostat or Chronothermostat SELV simple contact Closed contact heating request or Remote control original accessory only SE To optional outdoor temperature sensor Abbreviations COM Common NC Normally closed contact NO Normally open contact HEA Heating diverting command DHW Hot ...

Page 16: ... required to fill the system with anti freeze solution do this operation then hermetically close the connection or the valve used to put the solution in to allow the pressurization f f Gradually open the filling cock 2 f f Check the correct functioning of automatic venting devices eventually installed f f Close the radiators venting devices as soon as water flows out of them f f Make sure by readi...

Page 17: ...f Check the correct functioning of automatic venting devices eventually installed on the heating system and or on the storage coil circuit f f Close the radiators venting devices as soon as water or anti freeze solution flows out of them f f If the storage coil or the relevant circuit were equipped with manual venting valves use them to purge the residual air from them f f Make sure by reading the...

Page 18: ...Green Heating Technology 18 SERVICE Manual City Class F FR DHW exchanger F FR ...

Page 19: ...e unplug flow stat electrically C by hands rotate safety 3 bar D 90 clockwise to show the flow stat behind by hands unscrew 2 fixing screws A from hydraulic metal bracket cross screwdriver unscrew 1 fixing screw B from brass group cross screwdriver unscrew 1 screw E and to screw it where screw B has been left this way flow stat will leave easily its spot from brass group allen key 4 mm screw 1 scr...

Page 20: ...Green Heating Technology 20 SERVICE Manual City Class F FR Combustion components F FR ...

Page 21: ...osition 4 5 mm from burner straight plier check integrity of insulation parts check and clean the nozzeles plastic brush check and clean the fan check and clean the fan probe M clean the main heat exchanger bottom and top part plastic brush MOUNTING refit the flues hood being careful to position the lip N correctly under the profile O by hand mount the nozzle ramp with the 4 screws G replace the g...

Page 22: ... the minimum value respecting the data on User manual A Maximum adjustment Use the nut 10 mm to set the maximum value respecting the data on User manual B Protection cup After any adjustments mount the protection cup C F FR Gas supply pressure Nominal pressure mbar 20 37 20 37 20 37 20 37 Inlet pressure min max mbar 17 25 35 40 17 25 35 40 17 25 35 40 17 25 35 40 Injectors number 9 11 13 15 Inject...

Page 23: ...display is showing on the left 00 n of Parameter and on the right 000 Value of Parameter chosen 3 Acting on left knob for scrolling Parameters 4 Acting on right knob for changing Parameter values 5 Storing values changed pressing button RESET for 3 sec 6 Parameter Access still be active for 15 min exit function pressing F FR Scrolling parameters Changing values storing ...

Page 24: ...nd 0 240 30 Seconds Post circulation after CH demand F FR 21 Timing of pump functioning after DHW demand F 0 3 FR 0 240 3 180 Seconds Post circulation after DHW demand FR 23 Set temperature of tank 0 30 60 0 0 Settable by knob on control panel 30 60 temperature set by the technician and not settable anymore by the user F FR 24 DHW max Power inlet 0 100 100 of max DHW power inlet available FR 25 ΔT...

Page 25: ... order check resistance values with standard ones F FR E13 SERVICE Gas Valve modulator coil not electrically supplied Check gas valve wire connection PCB is not correctly managing gas valve replace PCB F FR E17 SERVICE Buttons Anomaly if a button remains wrongly pressed Check keyboard buttons F FR E22 SERVICE Uncorrect microprocessor programming Power OFf and Power ON for reset F FR E23 SERVICE El...

Page 26: ...s referred to the capacity available to the system 0 1 2 3 4 5 6 0 200 400 1000 1200 600 800 1400 1600 00361 B 01 pressure m H 2 O water flow l h mod 30F speed 3 2 of the pump The graph is referred to the capacity available to the system 0 1 2 3 4 5 6 0 200 400 1000 1200 600 800 1400 1600 00361 C 01 pressure m H 2 O water flow l h mod 35F speed 3 2 of the pump The graph is referred to the capacity...

Page 27: ... 0 1 2 3 4 5 6 7 0 200 400 1000 1200 600 800 1400 0 1 2 3 4 5 6 7 0 200 400 1000 1200 600 800 1400 00381 B 00 pressure m H 2 O pressure m H 2 O water flow l h water flow l h speed 3 2 of the pump City Class 30 FR The graph is referred to the capacity available to the system DHW storage coil CH system 0 1 2 3 4 5 6 7 0 200 400 1000 1200 600 800 1400 0 1 2 3 4 5 6 7 0 200 400 1000 1200 600 800 1400 ...

Page 28: ...4 53 62 54 22 51 93 53 21 53 82 58 58 57 11 59 11 58 58 57 11 59 11 Efficiency Nominal efficiency at Qn 92 7 93 3 94 0 94 0 Efficiency at 30 Qn 90 5 91 0 91 5 91 5 Heating Temperature selection range min max C 35 80 35 80 35 80 Expansion vessel l 8 8 8 8 Exp vessel pre loading pressure bar 1 1 1 1 Loss of water pressure switch off on pressure bar 0 4 0 9 0 2 0 4 0 9 0 2 0 4 0 9 0 2 0 4 0 9 0 2 To ...

Page 29: ...nd gas connections mm see Dimensions and connections Flue types lengths and diameters kg see Flue systems Gas supply pressure Nominal pressure mbar 20 37 20 37 20 37 20 37 Inlet pressure min max mbar 17 25 35 40 17 25 35 40 17 25 35 40 17 25 35 40 Injectors number 9 11 13 15 Injectors diameter mm 100 130 78 130 78 130 77 130 78 Gas pressure to injectors at Qn MAX mbar 12 4 27 8 35 7 13 0 27 5 35 6...

Page 30: ...7 5 8 4 8 0 6 9 7 9 7 7 Flue temperature at Qn C 118 110 112 119 111 113 122 121 120 118 123 122 Flue mass flow rate at Qn kg h 53 74 53 62 54 22 51 93 53 21 53 82 58 58 57 11 59 11 72 37 72 11 74 16 Efficiency Nominal efficiency at Qn 92 7 93 3 94 0 94 0 Efficiency at 30 Qn 90 5 91 0 91 5 92 0 Heating Temperature selection range min max C 35 80 35 80 Expansion vessel l 8 8 8 10 Exp vessel pre loa...

Page 31: ...stem Gas supply pressure Nominal pressure mbar 20 37 20 37 20 37 20 37 Inlet pressure min max mbar 17 25 35 40 17 25 35 40 17 25 35 40 17 25 35 40 Injectors number 9 11 13 15 Injectors diameter mm 100 130 78 130 78 130 77 130 78 Gas pressure to injectors at Qn MAX mbar 12 4 27 8 35 7 13 0 27 5 35 6 12 8 27 7 35 8 12 6 27 4 35 4 Gas pressure to injectors at Qr MIN mbar 2 4 6 5 6 5 1 9 4 9 4 9 1 9 6...

Page 32: ...esent manual In order to constantly improve its products the company has the right to change features and data written in the present manual at any time and without notice www italtherm it ITALTHERM S p A Via S D Acquisto 29010 Pontenure PC Italy P iva C F 01594830331 Tel 39 0523 575611 www italtherm it ...

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