Italtherm CITY MAX 26 K Instruction Handbook Manual Download

Page: 35 / 56

Green Heating Technology

HEAT INPUT

FAN RPM

INDICATIVE

DISPLAY

VALUE

kcal/h

Natural gas

G20

Commercial

Propane G31

City Ma

x 32 K

MIN. 6.9

5934

1500

1600

9.5

8170

1930

2030

12.0

10320

2360

2460

14.5

12470

2790

2890

17.0

14620

3220

3320

19.5

16770

3650

3750

22.0

18920

4080

4180

24.5

21070

4510

4610

23220

4940

5040

29.5

25370

5370

5470

MAX. 32.1

27606

5800

5900

Electronic settings

Accessing the main board

To access the main board:

Cut off the electrical supply to the boiler. Re

store the supply after having closed the contol

panel rear cover.

unscrew the screws

and remove the back cover

of the control panel.

Main board settings

The boiler is equipped with a Microprocessor modulation board, featuring a 6-microswitch array

(SW1÷SW6) which allow to make personalizing actions for the boiler’s functioning as described in the

following table.

Disconnect the power supply

before approaching the microswitches. Restore the power supply

only after you have closed the back cover of the control panel.

Changes to microswitches status have no effect until the boiler is electrically supplied (they are

red during the board startup, when the supply is connected).

M15

M16

28
27

26
25
24
23
22

39
38

SW1

SW6

SW 1

OFF

SW 2

SW 3

SW 4

SW 5

SW 6

00014 00

Summary of Contents for CITY MAX 26 K

Page 1: ...IMPORTANT Install the gasket included in the documents bag on the inlet outlet flange as shown on page 21 Instruction Handbook for use adjustment maintenance installation CITY MAX 32 K 26 K ...

Page 2: ...n 16 Outdoor installation in a partially protected place 16 Positioning and fastening 16 Hydraulic system DHW and heating 18 Advices and suggestions to avoid vibrations and noises in the system 18 Cleaning and preservation of the systems 18 Heating system 18 Condense drain 18 System filling and pressuring 19 DHW storage tank filling 19 Heating system filling 19 Gas connection 20 Electrical connect...

Page 3: ...d extra contractual responsibility for any damage arising from wrong installation wrong use and non observance of current laws and instructions given by the manufacturer himself f f Important this gas boiler is used to heat the water at a temperature lower than the boiling one at atmospheric pressure it must be connected to an heating system and or to a domestic hot water system in accordance with...

Page 4: ... takes place Personnel in charge of installation Place here all necessary advices according to national rules about WORK SAFETY of Personnel in charge of installation An example follows Law number 192 of 19 August 2005 and further revisions Title of the law or brief description Always proceed with caution when handling the boiler and carrying out installation mainte nance work as metal parts may c...

Page 5: ... Gas G20 Methane or Com mercial Propane G31 A qualified technician can convert it to operate with one of these two types of gas above said It must never be used with butane gas G30 that can be present pure or mixed with Propane G31 in the portable gas bottles for cookers The User must not touch sealed items nor break the seals Only specialized technicians and the official technical service can bre...

Page 6: ...tarting up maintenance and servicing All operations for installation first starting up maintenance servicing and gas conversion must be car ried out by qualified technicians in accordance with the Norms and Laws in force Maintenance operations must be carried out in compliance with the manufacturer prescriptions and in compliance with the laws and rules presently in force for what is not mentioned...

Page 7: ...served to the technician Turn the knob 13 on the scale immediately 4 service Indication on the display for the Technician usually not displayed 5 2 digit number on the display Normally it indicates in C the measured temperature of the heating system flow or of the DHW storage when the relevant symbol 6 or 7 flashes During the adjustment of the heating system temperature rotating the knob 12 along ...

Page 8: ...e 14 The use of the positions 15 and 16 is reserved to the technician 14 Scale on which the knob 13 should be positioned to adjust the Domestic Hot Water temperature in the storage 15 service Positions of the knob 13 which use is reserved to the technician Do not turn the knob 13 on these positions 16 17 By turning the knob 13 on this position hot water stand by the storage heating is completely d...

Page 9: ...and 1 5 Bar The system pressure raises with the temperature a too high initial cold system pressure could lead to water drain from the 3 Bar safety valve after the system heating up f f Make sure that the gas cock 20 is open f f Make sure that the boiler is electrically supplied green light 1 blinks Boiler activation f f Rotate the knob 12 on Summer 11 if you want to have only hot water production...

Page 10: ...ature by drawing only hot water or eventually by mixing it with a little cold water Avoid maximum values if not strictly needed that will force to mix the hot water with bigger quanti ties of cold water A high storage temperature increase the limestone scale of the storage Also gas consumption depends on the set temperature aside from the quality of the storage thermal insulation Remark Because of...

Page 11: ...alue is too high it is suggested the installation of a soften ing device in order to prevent the limestone precipitation this operation avoids a frequent cleaning of the coil of the DHW storage Boiler inactivity The effects of the periods of inactivity can be relevant in particular situations such as in flats used only for some months per year most of all in cold places The user will have to decid...

Page 12: ...of water and lime This can also occur when the boiler is locked red lamp on provided that the system pressure is correct In order for these systems to be active the boiler must be receiving gas and electricity boiler must be left in stand by mode Summer Winter knob on green lamp flashing system pressure must be correct 1 1 5 bar in a cold state minimum 0 5 bar In case of lack of gas the burner won...

Page 13: ...u can anyway set the room temperature a few degrees above zero e g 5 C if it s a chronothermostat remember to set it to manual mode The Ambient Anti Frost function does not protect the sanitary circuit outside the boiler and especially in areas where the heating system doesn t reach For this reason we recommend that you empty the cold and hot sanitary system if they were at risk of freezing Instal...

Page 14: ...axial system 3 Air inlet for split pipe system TA L Indicative position for electrical power supply and room thermostat wirings TA Room thermostat wiring L Electrical power supply wiring SC Indicative position for the condensate drain upper view front view hydraulic connections on the boiler left side view hydraulic connec tions on the boiler City Max 26 K City Max 32 K front view hydraulic connec...

Page 15: ...hardness If the water hard ness is more than 25 fr it s required to install a softener to bring the hardness below that value Besides the presence of solid residuals or impurities in the water for example in case of new systems could compromise the correct functioning of the boiler For DHW production systems the regulation in force prescribes a safety filter to protect the systems The condensing b...

Page 16: ...partially protected places The boiler minimum and maximum working tem peratures are mentioned in the paragraph Tech nical data on page 45 and on the boiler data plate The materials used for the boiler installation in cluding the devices and or the materials used for thermal insulation should be so to maintain their functionality within the temperature range indi cated on the data plate If the plac...

Page 17: ... the plugs and B for the open hooks f f Remove the plastic caps placed to close the hydraulic connections on the boiler f f Proceed with the hydraulic gas electrical and flue connections follow ing the instructions and warnings reported in the following paragraphs The connections of the boiler are engineered to fit plain couplings with screw ring interposing a plain gasket of suitable size and ma ...

Page 18: ...stem with water before connecting the boiler This will elimi nate residual like welding drops slag hemp mastic mud rust and other dirt from pipes and radiators Otherwise these substances could enter the boiler and damage the internal compo nents pump etc f f In case of old or very dirty systems to wash them use specific proven efficiency products in the suitable quantity and following the instruct...

Page 19: ...t the plug of the automatic air vent in corporated in the boiler circulator is unscrewed if not unscrew it and leave it unscrewed even afterwards for normal operation 3 If it s 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 4 Gradually open the filling cock 1 5 Check...

Page 20: ...in the G31 conversion kit on the gas tank or in its immediate vicinity so that it is visible to the employee when it is being refilled Using Propane gas G31 it is absolutely necessary to install a pressure reducer upstream the boiler Failure to do this the gas valve of the boiler will get damaged The gas connection as generally the boiler installation must be done by qualified personnel as prescri...

Page 21: ...e replaced use one of the following cable types H05VVF or H05 VVH2 F It is mandatory the earth connection in accordance with the rules actually in force To replace the cable open the control panel cover unlock its fastening device and disconnect it from the terminals Install the new cable proceeding in the reverse way When connecting the cable to the boiler it s mandatory to leave the Earth wire a...

Page 22: ... kit of condense collector consult the commercial catalogues of the original accessories and ducting the condense formed towards the outlet duct as foreseen by the norms in force in matter of condensing boilers Air inlet and flue outlet terminals should be protected by suitable approved flue accessories to avoid environmental elements penetration Carefully follow the indications foreseen by the sp...

Page 23: ...tlet pipe 0 7 m 5 Pa Separate system Ø 60 mm original accessories Reduction from Ø80mm to Ø60mm on inlet 0 4 m Reduction from Ø80mm to Ø60mm on outlet 1 7 m Linear section or extension Ø60mm length 0 5m on inlet 0 5 m Linear section or extension Ø60mm length 0 5m on outlet 0 5 m Linear section or extension Ø60mm length 1m on inlet 0 9 m Linear section or extension Ø60mm length 1m on outlet 1 m Lin...

Page 24: ...nsidered IMPORTANT this table is referred to the original flue ac cessories Using non original flue accessories certified for condensation whose use is allowed by the boiler s C6 type certification refer to paragraph Dimensioning the inlet and outlet ducts on page 23 Coaxial system C13 C33 00047 00 1300 LCV Ø100 Ø60 Ø125 00049 00 LCO Ø100 Ø60 127 135 Example of vertical coaxial system C33 Example ...

Page 25: ...s of the inlet ducts for their all length or at least only for the external tract is sufficient to prevent that the rain water reaches the combustion chamber 5 so the inlet must not be downwards 6 do not let the condense go out from the flue outlet terminal 7 the coaxial inlet outlet duct must be installed so as the flues are upwards and so the condense discharge itself towards the boiler The term...

Page 26: ...e firing the boiler check that the circulator is not blocked due to inactivity unscrew the plug in the centre of the cap to access the rotor shaft and manually rotate it using a screwdriver or other suitable tool During the commissioning of the new boiler it is necessary to run the burner for 30 minutes before checking the combustion because in that period of time any residual fabrication va pours...

Page 27: ... that the combustion is correctly regulated go on in this chapter as described in the paragraph Combustion test and adjustment on page 31 During the first ignition of the brand new boiler it is necessary that burner works for at least 30 minutes before performing combustion checks During this time the fumes of the eventual residual manufacturing materials are produced and they could alter the meas...

Page 28: ... f f verify the correct functioning of the boiler in heating and do mestic hot water version f f fill in the foreseen documentation and leave to the user the copy of his competence Access to the inside of the boiler 1 Unscrew the screws 1 and remove the lower grid 2 if any Remark Lower grid is spare inside packing not assem bled 2 Push the front panel 3 upwards and remove it unhook ing it from the...

Page 29: ...by 2 insert a rubber hose 12 on the hose connection of the manual venting valve 11 of the storage coil and lead the other end of the hose to a suitable drain 3 gradually open the manual venting valve 11 from the hose water and air will go out check that there are no water leaks on the hose connection side 4 gradually open the system filling cock located on the boiler lower side 5 close the system ...

Page 30: ...r we recommend to wear the proper devices for the personal protection i e glasses gloves masque Warning do not wash or damage the insulating coverings inside the combustion chamber f f Open the sealed chamber f f disconnect the two fan connectors 10 f f disconnect the connectors 12 from the ignition electrode 2 and from the flame detection electrode 13 Atten tion do not dismount the electrodes fro...

Page 31: ...jets then clean the primary exchanger coils by a NOT METALLIC brush and remove the residuals again by using the vacuum cleaner f f locate the lower cap 8 of the siphon where you can access from the lower side of the boiler behind the returned connector of the system put a collector for liquids under it Unscrew the cap Let the siphon empty itself Inside the cover a layer of residual could be presen...

Page 32: ...n is rotating at 1400 rpm Heat input Natural gas G20 Commercial propane G31 CO2 Fan rpm x 100 CO2 Fan rpm x 100 Reduced Qr 8 9 0 5 14 15 9 6 0 5 15 16 Nominal Qn 9 1 0 5 57 58 10 0 0 5 58 59 7 the burner ignites at the reduced input Wait for the boiler to come up to full operation about 5 minutes If the value of CO2 in the fumes at the reduced input Qr for the type of gas used is within the range ...

Page 33: ...t must be set in accordance with the system require ments stated in the project Power input values corresponding fan rpms and relevant display indications are listed in the Power input display fan rpm table on page 34 The adjustment will be performed through the boiler s controls following a special procedure that avoids accidental activations by the User 1 get information about the maximum heatin...

Page 34: ...ayed on the manometer remains stabilized on the correct value If further pressure adjustment should be needed turn the knob and wait again 30 seconds and the end of flashing to confirm and save the setting turn the Hot Water knob on the scale the burner will turn off for a moment Wait about 5 seconds that both the green and red indicators stay on for about 5 seconds this is the confirmation that t...

Page 35: ... cover f f unscrew the screws 1 and remove the back cover of the control panel Main board settings The boiler is equipped with a Microprocessor modulation board featuring a 6 microswitch array SW1 SW6 which allow to make personalizing actions for the boiler s functioning as described in the following table Disconnect the power supply before approaching the microswitches Restore the power supply on...

Page 36: ...peratures for the burner to be turned ON and OFF during the DHW work OFF burner OFF at 75 C and burner ON at 60 C Factory setting ON burner OFF at the set DHW temperature T SET 3 C and burner ON at T SET 2 C SW5 Pump functioning mode during heating working OFF intermittent for normal applications with or without delay see SW3 Factory setting ON always off external pumps are present Remark The pump...

Page 37: ...r compensation plug again 7 open the sealed chamber loosen the screw 5 and remove the bracket 6 8 loosen the swivel nut 7 that connects the gas tube 4 to the gas valve and unplug the other end of the tube 4 from the fan 3 9 remove the diaphragm 8 by attaching a piece of adhesive tape and lifting it from its seat NEVER USE TOOLS espe cially through the calibrated hole 10 insert the diaphragm from t...

Page 38: ... verifying that no overheating problems occur Draining the heating system and the storage coil When it is necessary to drain the heating system proceed as described here below f f Connect a rubber pipe to the draining tap ter minal 1 f f put the other end of the pipe in a suitable drain or sink f f open the draining tap by turning the nut 2 counterclockwise using a suitable spanner f f when the pr...

Page 39: ...g of the burner Incorrect com bustion flame de tachment from the burner Check that the Inlet Outlet Ducts and the respective terminals are clean and in good condition and that there are no leaks in them During the installation respect the regulation prescriptions the slopes and the lengths see Flue systems on page 21 Note for the TECHNICIAN The burner flame is not detected by the control electron ...

Page 40: ...ICIAN the flue thermal fuse preserves the flue ducts that are made with Polypropylene a material suitable to the condensate acidity from the high temperatures that could lead to their fusion or deformation The trig gering of this device consists in its blowing and therefore it must be replaced 5 Communication be tween display and main PCB is not cor rect At every Power On this alarm is showed for ...

Page 41: ... production is locked too If any floor heating system was installed check the integrity of the jumper connecting terminals 57 and 58 of M12 see Electrical diagram on page 49 If the floor heating system is installed check the system flow tem peratures on the boiler and on the low temperature system kits if installed Replace the faulty or out of tolerance thermostats Check the correct positioning of...

Page 42: ...he alarm is no more displayed even though the problem persists Check the cabling of the outdoor temperature probe Replacement of the outdoor temperature probe The alarm shows again only if the resistance of the probe is out of tolerance or in short circuit On the contrary if the probe or the relevant cabling is interrupted when the electrical supply is restored the boiler will consider the externa...

Page 43: ...he red lamp turns off then bring again the knob in the previous position It is impossible to restart the boiler before the cooling of the system If the block happens again please call a qualified technician 46 Cabling configura tion error See alarm 33 The Hot Water knob is on a position reserved to the techni cian or service Turn the knob back along the scale RED GREEN it has been started by mista...

Page 44: ...and operation f f Check the water and gas connections tightness f f Check the gas consumption at the minimum and maximum output f f Verify that safety devices are correctly working f f Verify the correct functioning of control and adjusting devices f f Verify periodically the absence of leaks of combustion products to the inner room the correct func tioning and the integrity of the flue outlet duc...

Page 45: ... C l h 2 3 1 5 2 9 1 9 Condense quantity at Qr 30 50 C l h 0 5 0 4 0 8 0 7 Condense acidity pH 2 8 2 8 2 8 2 8 Flue temperature Qn C 76 5 76 5 72 5 72 5 Flue mass flow rate 60 80 C Qn kg h 42 61 43 49 52 20 53 76 EFFICIENCY Nominal efficiency at 60 80 C 96 9 97 7 Efficiency at 30 load at 60 80 C 100 4 100 6 Nominal efficiency at 30 50 C 105 1 105 8 Efficiency at 30 load at 30 50 C 107 2 107 8 syst...

Page 46: ...see also DHW storage tank filling on page 19 Max supply pressure storage safety valve threshold bar 8 Storage temperature selection range min max C 30 60 ELECTRICAL DATA Voltage frequency nominal voltage V Hz 220 240 50 230V Power consumption W 165 170 Level of protection IP X4D DIMENSIONS Width Height Depth mm see Dimensions and connections on page 14 Weight kg 59 5 60 0 CONNECTIONS Hydraulic and...

Page 47: ...Green Heating Technology 47 TECHNICAL DATA cont d U M City Max 26 K City Max 32 K Gas type G20 G31 G20 G31 GAS CONSUMPTION Qmax m h 2 77 3 39 kg h 2 03 2 49 Qmin m h 0 56 0 73 kg h 0 41 0 53 Notes ...

Page 48: ...as valve 15 System pressure gauge 16 Safety valve 3 bar 17 Filling valve 18 Drain valve 19 By pass 20 Pump 21 Storage safety valve 8 bar 22 DHW filter 23 Flow limiter 24 Storage drain valve 25 Pipe for condense outlet 26 Storage inspection door 27 Storage tank 28 Motorized 3 way valve 29 Automatic Venting Device heating circuit incorporated in the pump 30 DHW expansion vessel 31 Storage temperatur...

Page 49: ...Gas valve 20 Pump 28 Motorized 3 way valve 31 Storage temperature sensor 32 1 Fan speed control 32 2 Fan supply 33 Temperature Sensor system flow 35 Safety thermostat on system flow 60 Display board 61 Fuse F2A 2A fast the contacts of these components are shown in rest conditions cold condition no system pressure no flow Optional external devices 70 Room thermostat Voltage free Contact for Room Th...

Page 50: ...torage safety valve 8 bar 22 DHW filter 23 Flow limiter 24 Storage drain valve 27 Storage tank 28 Motorized 3 way valve 29 Automatic Venting Device heating circuit incorporated in the pump 30 DHW expansion vessel 31 Storage temperature sensor 32 Fan 33 Temperature Sensor system flow 34 Air Gas Mixing System 35 Safety thermostat on system flow 36 Manual venting valve storage coil 37 Heating system ...

Page 51: ...0 use higher values when there is a high ther mal dispersion and therefore a less efficient insulation and vice versa Because of the wide buildings typologies it s impossible to give precise indications on kd value to set The correct setting must be determined case by case and will have as a result an opti mal comfort in all the climatic conditions requiring heating i e a prompt reaching of the ro...

Page 52: ...tat Remote Control cable coming out of the boiler by means of a suitable bipolar terminal See also Electrical diagram on page 49 Note The Remote Control link is not polarized 4 power supply the boiler turn the boiler s Summer Winter knob on Summer otherwise the Remote Control doesn t work and the boiler goes into alarm 31 described below 5 check the correct work of the device The electronics shoul...

Page 53: ...Green Heating Technology 53 Notes ...

Page 54: ...Green Heating Technology 54 Notes ...

Page 55: ...Green Heating Technology 55 Notes ...

Page 56: ...960000027_03_ENG 12 03 2015 ITALTHERM Srl declines any responsibility for eventual printing and or transcription errors in the present 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 UNI EN ISO 9001 2008 ...

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