Unical XC-K oil 230 Technical specifications

ENGLISH
INSTALLATION AND MAINTENANCE INSTRUCTION
69 - 100 - 150 - 230 - 300 - 350 - 400 - 500
650 - 850 - 1000 - 1300 - 1550
XC-K oil

2
http://www.unicalag.it/prodotti/professionale-300/commercial-condensazione-inox/1963/xc-k-oil
Provisions for proper disposal of the product.
At the end of its life cycle the product must not be disposed of as urban waste. It can be taken to a special
recycling centre managed by the local authorities, or to a dealer who o󰀨ers this service.
Separate disposal of a domestic appliance avoids possible negative consequences for the environment and
human health deriving from inappropriate waste handling and allows the recovery of the materials of which
it is made, in order to obtain signicant energy and resource savings.

3
Technical features and dimensions Technical Features General information
Maintenance instructions
ENGLISH
INDICE
1 GENERAL INFORMATION.......................................................................................................................................................4
1.1 General warnings...................................................................................................................................................................4
1.2 Symbols used in the manual..................................................................................................................................................4
1.3 Water treatment .....................................................................................................................................................................4
1.4 Information for system manager............................................................................................................................................5
1.5 Safety warnings .....................................................................................................................................................................6
1.6 Technical data plate...............................................................................................................................................................7
1.7 General Info...........................................................................................................................................................................8
2 TECHNICAL FEATURES AND DIMENSIONS .......................................................................................................................9
2.1 Technical features .................................................................................................................................................................9
2.2 Main components..................................................................................................................................................................9
2.3 Smoke turbolator .................................................................................................................................................................10
2.4 Dimensions .........................................................................................................................................................................11
2.5 Operating data ....................................................................................................................................................................14
3 INSTALLATION INSTRUCTIONS..........................................................................................................................................20
3.1 General warnings...............................................................................................................................................................20
3.2 Installation standards .........................................................................................................................................................20
3.3 Handling.............................................................................................................................................................................21
3.4 Positioning in boiler room...................................................................................................................................................21
3.5 Burner ................................................................................................................................................................................21
3.5.1 Choosing the burner ................................................................................................................................................21
3.5.2 IInstalling the burner .................................................................................................................................................22
3.6 Connecting ame sight glass to burner..............................................................................................................................23
3.7 Furnace door adjustment, opening and closing .................................................................................................................23
3.7.1 XC-K oil 100 ÷ XC-K oil 650......................................................................................................................................23
3.7.2 XC-K oil 850 ÷ XC-K oil 1000....................................................................................................................................23
3.7.3 XC-K 1300 oil ÷ XC-K oil 1550..................................................................................................................................24
3.7.4 Important note ..........................................................................................................................................................24
3.8 Connecting ue exhaust pipe.............................................................................................................................................25
3.9 Condensation drainage......................................................................................................................................................25
3.10 Connecting boiler to system ..............................................................................................................................................26
3.11 Filling the system...............................................................................................................................................................26
3.12 Connecting gas .................................................................................................................................................................27
3.13 Packaging..........................................................................................................................................................................27
3.14 Assembling casing.............................................................................................................................................................28
3.15 Electrical connections........................................................................................................................................................32
3.16 MODULATING MASTER panel board code 37892...........................................................................................................33
3.17 Programming heating controllers with single boiler...........................................................................................................33
3.18Hydraulic and electric system connection with panel board code 37892...........................................................................37
3.19 Programming heating controllers with boilers in cascade .................................................................................................39
3.20MODULATING CASCADE panel board code 37900 .........................................................................................................43
3.21Hydraulic and electric system connection with boilers in cascade panel board code 37892 and 37900...........................45
3.22 DUAL-STAGE MASTER panel board code 38778............................................................................................................47
3.23 Programming heating controllers with single boiler...........................................................................................................47
3.24Hydraulic and electric system connection with panel board code 38778...........................................................................51
3.25 Programming heating controllers with boilers in cascade .................................................................................................53
3.26DUAL-STAGE CASCADE panel board code 37901 ..........................................................................................................57
3.27Hydraulic and electric system connection with boilers in cascade panel board code 38778 and 37901...........................59
3.28Commissioning ..................................................................................................................................................................61
3.29Adjusting the burner
4 INSPECTIONS AND MAINTENANCE...................................................................................................................................62
Inspection and maintenance instructions ..................................................................................................................................62
Boiler body maintenance...........................................................................................................................................................63
Maintenance of burner ..............................................................................................................................................................63
Checking ignition electrode .......................................................................................................................................................63
Components to check during yearly inspection.........................................................................................................................63

4
GENERAL INFORMATION
1.1 - SYMBOLS USED IN THE MANUAL
Pay special attention when reading this manual to the parts marked by the symbols:
NOTE!
Suggestions for the user
ATTENTION!
Possible hazardous situation
for the product and the environment
DANGER!
Serious danger for
personal safety and life
1.2 - APPROPRIATE USE OF APPLIANCE
The XC-K appliance has been built according to the current level of engineering and acknowledged
technical safety rules.
Nonetheless, if improperly used, dangers could arise for the safety and the very life of the user and other
persons or damage to the equipment or other objects.
The appliance is intended to operate in hot air circulation heating systems.
Any other use must be considered improper.
UNICAL shall not held be liable for any damage resulting from improper use; in this case the user is fully
responsible for the risk.
Use according to the intended purposes also include careful compliance with the instructions in this manual.
1.3 - WATER TREATMENT (see specific booklet)
• Thehardnessofthefeedwaterconditionsthefrequencyatwhichthedomestichotwaterexchangermustbe
cleaned.
• Ifthewaterhasahardnessgreaterthan15°f,werecommendusingwatersofteners,chosenaccordingtothe
characteristicsofthewater.
• Werecommendcheckingandcleaningthedomestichotwaterexchangerattheendoftherstyearofuseand
everytwoyearsthereafter;onthisoccasion,alsocheckthestateofwearoftheanode.
1.4 - INFORMATION FOR SYSTEM MANAGER
• Theusermustbeinstructedconcerningtheuseandoperationofhisheatingsystem,inparticular:
• Delivertheseinstructionstotheuser,aswellasotherdocumentsconcerningtheapplianceinsertedinthe
 bagcontainedinthepackaging. The user must keep this documentation so that it is available for further
consultation.
• Informtheuserabouttheimportanceoftheairventsandtheuegasexhaustsystem,highlightingtheir
 essentialfeaturesandtheabsoluteprohibitionofmodifyingthem.
• Informtheuserconcerningcontrollingthesystem’swaterpressureaswellasoperationstorestoreit.
• Informtheuserconcerningcorrecttemperaturecontrol,controlunits/thermostatsandradiatorsforsaving
 energy.
• Rememberthatthesystemmustreceiveregularmaintenanceatleastonceayearandacombustion
 analysismustbeperformedinthetimetableforeseenbystandardsinforce.
• Shouldtheappliancebesoldortransferredtoanewownerorifyoumoveandleave
 theappliance,alwaysmakesurethattheinstructionbookletaccompaniesitinordertobeconsulted
 bythenewownerand/orinstaller.
1
Attention: this manual contains instructions for the exclusive use of the professionally qualified installer and/
or maintenance technician in compliance with current legislation.
The user is NOT qualified to intervene on the boiler.
The manufacturer will not be held liable in case of damage to persons, animals or objects resulting from failure
to comply with the instructions contained in the manuals supplied with the boiler.

5
1.5 - SAFETY WARNINGS
Attentione!
The appliance must be installed, adjusted and maintained by professionally qualified personnel, in
compliance with standards and provisions in force. Incorrect installation can cause damage to persons,
animals and objects for which the manufacturer cannot be held responsible.
DANGER!
NEVER attempt performing maintenance or repairs on the boiler on your own initiative.
Any work must be done by professionally qualified personnel.
We recommend stipulating a maintenance contract.
Insufficient or irregular maintenance can jeopardise the operating safety of the appliance and cause damage
to persons, animals and objects for which the manufacturer cannot be held responsible.
Modifying parts connected to appliance
Donotmodifythefollowingparts:
- theboiler
- thegas,air,waterandelectricitylines
- uegaspipe,safetyvalvesandheatingwaterdrainpipe
- constructionpartswhichaffecttheoperatingsafetyoftheappliance
Attention!
Totightenorloosenthescrewedttings,useonlyappropriatexedspanners.
Incompliantuseand/orinappropriatetoolscancausedamage(e.g.waterorgasleakage).
ATTENTION!
Indications for propane gas-fired appliances
Makesurethatthegastankhasbeendeaeratedbeforeinstallingtheappliance.
Forstate-of-the-artdeaerationofthetank,contacttheLPGsupplierorapersonqualiedincompliancewithlaw.
Ifthetankhasnotbeenprofessionallydeaerated,ignitionproblemscouldarise.
Inthatcase,contactthesupplieroftheLPGtank.
Smell of gas
Shouldasmellofgasbeperceived,followthesesafetyguidelines:
- donotturnelectricswitchesonoroff
- donotsmoke
- donotusethetelephone
- closethegasshut-offvalve
- airouttheareawherethegasleakagehasoccurred
- informthegassupplieroracompanyspecialisedininstallationandmaintenanceofheatingsystems.
Explosive and easily flammable substances
Donotuseorstoreexplosiveoreasilyammablematerials(e.g.petrol,paints,paper)intheroomwheretheap-
plianceisinstalled.

6
1.6 - TECHNICAL DATA PLATE
The technical data plate is adhesive and is included in the document case; it must be applied by the installer on the
outside of the casing.
The serial number of the boiler is on the riveted plaque on the front plate of the body (front right bottom side).
The CE marking
certies the compliance of the equipment with the essential
safety requirements dened in the directives and applicable
European regulations and that its functioning satisfy applicable
technical standards.
The CE marking is a󰀩xed to each piece of equipment with an
appropriate label.
The CE declaration of conformity issued in accordance with
international standards by the manufacturer, is placed in docu-
mentation envelope supplied with the product.

7
General information
ENGLISH
1.7 - GENERAL WARNINGS
Theinstructionbookletisanintegralandessentialpartofthe
productandmustbekeptbytheuserorsystemmanager.
Readthewarningscontainedinthisinstructionbookletcarefully
astheyprovideimportantguidelinesregardinginstallation,use
andmaintenancesafety.
Keepthebookletwithcareforfurtherconsultation.
Installationandmaintenancemustbeperformedincompliance
withstandardsinforceaccordingtotheinstructionsofthema-
nufacturerandbyqualiedandcertiedpersonnelin
compliancewithlaw.
Byprofessionallyqualiedpersonnelwemean:personnelwith
specictechnicalskillintheeldofheatingsystemcomponents
forciviluse,domestichotwaterproductionandmaintenance.
Personnel must have the qualications foreseen by current
legislation.
Incorrectinstallationorimpropermaintenancecancausedamage
topersons,animalsorobjectsforwhichthemanufacturerisnot
responsible.
Beforeperforminganycleaningormaintenance,disconnectthe
appliancefromtheenergymainsbyactingontheswitchofthe
systemand/orthroughthespeciccut-offdevices.
Notobstructtheterminalsoftheintake/exhaustducts.
Incaseoffailureand/ormalfunctioningoftheappliance,switch
itoffanddonottrytorepairitorinterveneonitdirectly.
Contactonlypersonnelqualiedincompliancewithlaw.
Anyrepairsmustbeperformedsolelybypersonnelauthorisedby
Unicalusingoriginalsparepartsonly.Failuretocomplywiththe
abovecanjeopardisethesafetyoftheappliance.
To guarantee appliance efciency and its correct operation,
yearlymaintenancemustbeperformedbyqualiedpersonnel.
Should you decide not to use the appliance, parts entailing
potentialsourcesofhazardmustbemadesafe.
Shouldtheappliancebesoldortransferredtoanewowneror
ifyoumoveandleavetheappliance,alwaysmakesurethatthe
instructionbookletaccompaniesitinordertobeconsultedby
thenewownerand/orinstaller.
Onlyoriginalaccessoriesmustbeusedforallapplianceswith
optionalsorkits(includingelectric).
Thisappliance isintendedsolelyforthe useforwhichit was
expresslydesigned.Anyotheruseistobeconsideredimproper
andthereforedangerous.

8
TECHNICAL FEATURES
AND DIMENSIONS
2.2 - MAIN COMPONENTS
XC-Koilboilersareequippedwithablindcylindricalfurnace,
inwhichthecentralameoftheburnerisreversedperipherally
towardsthefront.Whenthecombustiongaseshavereachedthe
frontpart,theyaresentthroughthedoorintothetubesofthethird
passtoreachtherearuegaschamberandthenthechimney.
Thecombustionchamberisalwayspressurisedwhiletheburner
isoperating,withinthepowerrangeoftheboiler.
Forthevalueofthispressure,seethetables
onpages11÷13,inthecolumn“Fluegasside
pressuredrops”.
Thechimneymustbecalculatedsothat
nopositivepressureisdetected
atitsbase.
2
1
2
3
6
5
4
M
Rat
Rbt
2.1 - TECHNICAL FEATURES
NOTE!
Further details in the section
‘‘Technical Information’’ on the boiler
page of the www.unicalag.it website
fig. 1
KEY
N° Description
1 Furnace
2Smoke pipes with smoke diverters
3Door with ame sight glass
4 Smoke chamber
5 Body insulation
6 Panel board
M Flow
Rbt Low temperature return
Rat High temperature return

9
General information
ENGLISH
2.3 - SMOKE TURBOLATOR
XC-Koilboilersaredesignedtobeusedwithinanoutputrange
inordertoimproveseasonalefciencyandcouplingwitheach
heatingsystem.
Theheatoutputmustthereforebeadjusteduponcommissioning,
basedontheguidelinesoftheThermotechnicalEngineer,and
alwayswithintherangeprovidedforeachboileronpages14-15
bytheburnertechnicianwhowilldeterminethefuelowrate.
Inallcases,
the turbulators will be placed, within their smoke pipes with
respect to the front edge, as per below drawing.
Using the boiler to minimum power, the ue gas temperature
fig. 1a
must not be less than those indicated on page 14 and 15.
Otherwise, rst contact our After Sales Service, make sure that
all the turbolators are present in smoke pipes.
At the rst commissioning the burner must be carried out under
the responsibility of a qualied burner technician, authorized by
the burner manufacturer.
In that occasion must be compiled a complete working report.
Note: Smoke turbolator are long as flue
pipe
M
Rat
Rbt
Smoking section tubes with placed turbulators
Place on the edge of smoke turbolator

10
2.4 - DIMENSIONS
XC-K oil 100
T1
T2
ISO7/1
T3
ISO7/1
T4
ISO7/1
T5
ISO7/1
T6
Ø
mm
Rp2 Rp2 Rp1¼ Rp¾ 150
100
XC-K
oil
Modello
Boiler
capacity
l
140
Maximum
operating
pressure
boiler
bar
6
Weight
kg
365
XC-K
oil
Model
100
DIMENSIONS
A
mm
650
B
mm
1100 1032
C
mm
190
D
mm
205
E
mm
F
mm
37
G
mm
329
H
mm
730
I
mm
135
L
mm
225 885
M
mm
570
N
mm
528
O
mm
922
P
mm
540
Q*
mm
961
R*
mm
(*) Minimum dimensions for boiler room access.
fig. 2
T7
Øi
mm
182
A
D
C
Q
BF E
R
G G
H H
T5
T2
T4
T4
T2
T3
T7 3° T7
T8T8
T1
T5
40
T6
1
2
T6
O
N
M
P
T1
T3
I L
T8
Øe
mm
40
Max
Temperature
allowable
°C
100
1 Panel board
2 Flame sight glass
T1 C.H. flow
T2 Low temperature C.H. return
T3 High temperature C.H. return
T4 Expansion vessel connection
T5 Boiler drain
T6 Burner connection
T7 Chimney connection
T8 Condensation drain
DETAIL FOR DOOR DRILLING
XC-K oil 100
CONNECTIONS
fig. 3
R efractory ins ulation
R efractory cement
B lind burner plate 200x200
B urner plate insulation gas ket 200x200
ø 150 ø 150
100

11
Technical features
ENGLISH
XC-K
oil
Model
DIMENSIONS
A
mm
720
790
790
854
854
B
mm
1450
1465
1755
1770
1940
1132
1282
1282
1472
1472
C
mm
190
190
190
190
190
D
mm
205
235
235
270
270
E
mm
F
mm
48
55
65
67
67
G
mm
374
402
402
494
494
H
mm
790
900
900
1062
1062
I
mm
255
231
271
306
306
L
mm
320
359
379
358
358
250
250
450
500
500
M
mm
625
625
655
606
776
N
mm
255
275
275
306
306
O
mm
1248
1385
1385
1585
1585
P*
mm
610
680
680
750
750
Q*
mm
1311
1314
1614
1606
1776
R*
mm
T1
T2
UNI2276PN6
T3
UNI2276PN6
T4
ISO7/1
T5
ISO7/1
T6
Ø
mm
DN65
DN80
DN80
DN100
DN100
DN65
DN80
DN80
DN100
DN100
Rp1½
Rp2
Rp2
Rp2
Rp2
Rp¾
Rp1
Rp1
Rp1
Rp1
180
180
180
220
220
150
230
300
350
400
XC-K
oil
Model
260
305
332
544
515
100
100
100
100
100
6
6
6
6
6
525
660
800
1007
1137
XC-K oil 150 ÷ 400
fig. 4
150
230
300
350
400
T7
Øi
mm
202
252
252
302
302
45
60
60
65
65
S
mm
3°
Q
H
T6
A
D
C
T8
G
T7
T5
R
H
T6
T2 - T 3 T1 T4
B
NMLI
F E
T8
T5
S
O
T2 - T 1 - T 4 T3
G
T7
P
1
2
T8
Øe
mm
40
40
40
40
40
fig. 5 fig. 6 fig. 7
Boiler
capacity
l
Maximum
operating
pressure
boiler
bar
Weight
kg
(*) Minimum dimensions for boiler room access.
Max
Temperature
allowable
°C
CONNECTIONS
DETAIL FOR DOOR DRILLING
XC-K oil 150
DETAIL FOR DOOR DRILLING
XC-K oil 230 ÷ 300
DETAIL FOR DOOR DRILLING
XC-K oil 350 ÷ 400
R efractory insulation
R efractory cement
B lind burner plate 250x250
B urner plate ins ulation gasket 250x250
ø 180 ø 180
100
R efractory insulation
R efractory cement
B lind burner plate 250x250
B urner plate ins ulation gasket 250x250
ø 180 ø 180
110
R efractory insulation
R efractory cement
B lind burner plate 280x280
B urner plate ins ulation gasket 280x280
ø 220 ø 220
110
1 Panel board
2 Flame sight glass
T1 C.H. flow
T2 Low temperature C.H. return
T3 High temperature C.H. return
T4 Expansion vessel connection
T5 Boiler drain
T6 Burner connection
T7 Chimney connection
T8 Condensation drain

12
XC-K oil 500 ÷ 1550
fig. 8
1 Quadro comandi
2 Spia controllo fiamma
T1 Mandata riscaldamento
T2 Ritorno riscaldamento bassa temperatura
T3 Ritorno riscaldamento alta temperatura
T4 Attacco vaso espansione
T5 Scarico caldaia
T6 Attacco bruciatore
T7 Attacco camino
T8 Scarico condensa
XC-K
oil
Model
DIMENSIONS
A
mm
894
894
1064
1064
1204
1204
B
mm
1970
2340
2360
2740
2980
3204
1612
1612
1802
1802
2052
2052
C
mm
190
190
190
190
190
190
D
mm
292
292
317
317
387
387
E
mm
F
mm
65
65
57
57
53
54
G
mm
523
523
551
552
681
681
H
mm
1161
1161
1287
1287
1493
1493
I
mm
275
405
289
459
372
371
L
mm
388
388
624
624
563
563
500
500
900
900
785
1010
M
mm
807
1047
547
757
1260
1260
N
mm
316
316
390
390
432
432
O
mm
1715
1715
1911
1911
2165
2165
P*
mm
790
790
960
960
1100
1100
Q*
mm
1787
2157
2157
2537
2752
2977
R*
mm
T1
T2
UNI2276PN6
T3
UNI2276PN6
T4
UNI2276PN6
T5
ISO7/1
T6
Ø
mm
DN125
DN125
DN150
DN150
DN200
DN200
DN125
DN125
DN150
DN150
DN200
DN200
DN65
DN65
DN80
DN80
DN100
DN100
Rp1
Rp1
Rp1½
Rp1½
Rp1½
Rp1½
270
270
320
320
320
320
500
650
850
1000
1300
1550
XC-K
oil
Modell
625
664
1107
1157
1936
1904
6
6
6
6
6
6
1376
1613
2158
2443
3458
3765
T7
Øi
mm
352
352
402
402
452
452
65
65
55
55
95
95
S
mm
T8
Øe
mm
40
40
40
40
40
40
500
650
850
1000
1300
1550
DETAIL FOR DOOR DRILLING
XC-K oil 500÷650
DETAIL FOR DOOR DRILLING
XC-K 850÷1550
3°
Q
H
T6
A
D
C
T8
G
T7
T5
R
H
T6
T2 - T 3 T1 T4
B
NMLI
F E
T8
T5
S
O
T2 - T 1 - T 4 T3
G
T7
P
1
2
fig. 9 fig. 10
100
100
100
100
100
100
Boiler
capacity
l
Maximum
operating
pressure
boiler
bar
Weight
kg
(*) Minimum dimensions for boiler room access.
Max
Temperature
allowable
°C
CONNECTIONS
R efractory ins ulation
R efractory cement
B lind burner plate 330x330
B urner plate ins ulation gasket 330x330
ø 270
ø 270
120
R efractory ins ulation
R efractory cement
B lind burner plate 380x380
B urner plate ins ulation gasket 380x380
ø 320
ø 320
150

13
Technical features
ENGLISH
2.4 - OPERATING DATA
Oil Fired
XC-K oil 69 100 150 230 300 350 400 500 650 850 1000 1300 1550
Nominal heat output
(80-60°C) [kW]:
66 86 134 202 278 327 385 482 626 789 963 1252 1492
Nominal heat output
(50-30°C) [kW]:
69 90 140 210 290 340 400 500 650 820 1000 1300 1550
Nominal Heat input [kW]: 67 88 137 206 284 333 392 491 637 804 980 1275 1520
Combustion E󰀩ciency full
load 80°C-60°C [%]:
97,8 97,8 97,8 97,9 97,9 98,0 98,2 98,2 98,2 98,2 98,2 98,2 98,2
Heatefciency
full load 50°C-30°C [%]:
102,5 102,0 102,0 102,0 102,0 102,0 102,0 102,0 102,0 102,0 102,0 102,0 102,0
Heatefciency
partial load 30% [%]:
(retourn 30°C)
104,0 104,0 104,0 104,0 104,0 104,0 104,0 104,0 104,0 104,0 104,0 104,0 104,0
Flue gas temperature
80°C - 60°C
(Tf - Ta) [°C]:
36,0 36,0 36,0 35,0 35,0 35,0 33,0 33,0 33,0 33,0 33,0 33,0 33,0
Flue gas temperature
50°C-30°C
(Tf - Ta) [°C]:
22,0 22,0 22,0 22,0 22,0 22,0 22,0 22,0 22,0 22,0 22,0 22,0 22,0
CO2 content [%]: 13,1 13,1 13,1 13,1 13,1 13,1 13,1 13,1 13,1 13,1 13,1 13,1 13,1
Flue gas mass [kg/h] 97 132 206 308 426 499 587 735 954 1204 1468 1908 2275
Combustion E󰀩ciency
80°C-60°C [%]:
98,4 98,4 98,4 98,4 98,4 98,4 98,5 98,5 98,5 98,5 98,5 98,5 98,5
Combustion E󰀩ciency
50°C-30°C [%]:
99,0 99,0 99,0 99,0 99,0 99,0 99,0 99,0 99,0 99,0 99,0 99,0 99,0
Heatlossatshell
80°C-60°C [%]:
0,6 0,6 0,6 0,5 0,5 0,4 0,3 0,3 0,3 0,3 0,3 0,3 0,3
Heatlossatshell
50°C-30°C [%]:
0,5 0,5 0,5 0,4 0,4 0,3 0,2 0,2 0,2 0,2 0,2 0,2 0,2
Heatlossatchimneywith
burnerON
80°C-60°C [%]:
1,6 1,6 1,6 1,6 1,6 1,6 1,5 1,5 1,5 1,5 1,5 1,5 1,5
Heatlossatchimneywith
burnerON
50°C-30°C [%]:
1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0
Heatlossatchimneywith
burnerOFF [%]:
0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05
Maximumcondensation
production L/H
5,5 5,5 8,6 12,8 17,7 20,8 24,4 30,6 39,7 50,1 61,1 79,5 94,7
Maximum boiler pressure
from standard mm.c.a.
8,4 8,4 16,0 25,7 33,4 37,2 41,1 47,9 56,2 63,5 69,9 78,1 83,7
mm.c.a. boiler pressure 5,8 5,8 11,2 13,0 25,0 29,7 37,0 43,1 50,6 52,7 62,8 70,3 75,3
Head losses H2O Dt 15
kPa
1,3 1,5 3,8 2,5 3,2 2,0 2,9 3,0 3,7 3,5 4,0 3,9 5,5
CO (0% O2) [mg/kWh] 3,1 3,2 4,7 3,1 4,7 4,7 4,7 3,1 4,7 4,7 4,7 4,7 4,7
Bacharach N° 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1

14
Gas Fired
XC-K oil 69 100 150 230 300 350 400 500 650 850 1000 1300 1550
Nominal heat output
(80-60°C) [kW]:
66 86 134 202 279 327 385 482 626 790 963 1252 1493
Nominal heat output
(50-30°C) [kW]:
72 94 147 220 304 357 420 525 682 860 1049 1364 1626
Nominal Heat input [kW]: 67 88 137 206 284 333 392 491 637 804 980 1275 1520
Combustion E󰀩ciency full
load 80°C-60°C [%]:
97,8 97,8 97,8 97,9 98,0 98,1 98,2 98,2 98,2 98,2 98,2 98,2 98,2
Heatefciency
full load 50°C-30°C [%]:
107,0 107,0 107,0 107,0 107,0 107,0 107,0 107,0 107,0 107,0 107,0 107,0 107,0
Heatefciency
partial load 30% [%]:
(retourn 30°C)
109,0 109,0 109,0 109,0 109,0 109,0 109,0 109,0 109,0 109,0 109,0 109,0 109,0
Flue gas temperature
80°C - 60°C
(Tf - Ta) [°C]:
34,0 34,0 34,0 34,0 32,0 31,0 31,0 31,0 31,0 31,0 31,0 31,0 31,0
Flue gas temperature
50°C-30°C
(Tf - Ta) [°C]:
22,0 22,0 22,0 22,0 22,0 22,0 22,0 22,0 22,0 22,0 22,0 22,0 22,0
CO2 content [%]: 10,3 10,3 10,3 10,3 10,3 10,3 10,3 10,3 10,3 10,3 10,3 10,3 10,3
Flue gas mass [kg/h] 97 127 198 296 409 480 565 707 918 1158 1412 1835 2188
Combustion E󰀩ciency
80°C-60°C [%]:
98,4 98,4 98,4 98,4 98,5 98,5 98,5 98,5 98,5 98,5 98,5 98,5 98,5
Combustion E󰀩ciency
50°C-30°C [%]:
99,0 99,0 99,0 99,0 99,0 99,0 99,0 99,0 99,0 99,0 99,0 99,0 99,0
Heatlossatshell
80°C-60°C [%]:
0,6 0,6 0,6 0,5 0,5 0,4 0,3 0,3 0,3 0,3 0,3 0,3 0,3
Heatlossatshell
50°C-30°C [%]:
0,5 0,5 0,5 0,4 0,4 0,3 0,2 0,2 0,2 0,2 0,2 0,2 0,2
Heatlossatchimneywith
burnerON
80°C-60°C [%]:
1,6 1,6 1,6 1,6 1,5 1,5 1,5 1,5 1,5 1,5 1,5 1,5 1,5
Heatlossatchimneywith
burnerON
50°C-30°C [%]:
1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0
Heatlossatchimneywith
burnerOFF [%]:
0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05
Maximumcondensation
production L/H
11,4 14,9 23,2 34,8 48,1 56,4 66,3 83,0 107,8 136,0 165,9 215,6 257,1
Maximum boiler pressure
from standard mm.c.a.
8,4 8,4 15,0 23,4 30,0 33,3 36,7 41,2 51,4 61,1 69,4 80,4 87,8
mm.c.a. boiler pressure 5,8 5,8 11,0 13,0 24,8 29,5 36,7 42,7 50,1 56,7 62,4 69,9 74,9
Head losses H2O Dt 15
kPa
1,3 1,5 3,8 2,5 3,2 2,0 2,9 3,0 3,7 3,5 4,0 3,9 5,5
CO (0% O2) [mg/kWh] 3,1 3,2 4,7 3,1 4,7 4,7 4,7 3,1 4,7 4,7 4,7 4,7 4,7
Bacharach N° 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1 0,1

15
Technical features
ENGLISH
TECHNICAL DATA ACCORDING ErP DIRECTIVE
OIL FIRED XC-K oil 69 oil 100 oil 150 oil 230 oil 300 oil 350 oil 400
Element Symbol Unit
E󰀨ective nominal output Prated kW 66 86 134 202 278 327 385
E󰀩cienza energetica stagionale del
riscaldamento d’ambiente ƞs% 93 93 93 93 93 93 93
Season e󰀩ciency class to
discharge A A A A A A A
For boilers to heat the room and mixed boilers: useful heat output
Useful heat output with
high temperature capacity
(Tr 60 °C / Tm 80 °C)
P4kW 66 86 134 202 278 327 385
Rated heat output e󰀩ciency
with high temperature capacity
(Tr 60 °C / Tm 80 °C)
ƞ4% 91,3 91,3 91,3 91,4 91,4 91,5 91,7
Useful power at 30% of the rated heat
output with low temperature
capacity (Tr 30 °C)
P1kW 20,9 27,5 42,8 64,23 88,7 104 122,4
Performance at 30% of the rated heat
output with low temperature
capacity (Tr 30 °C)
ƞ1% 93,7 93,7 93,7 93,7 93,7 93,7 93,7
Boiler with output range adjustment:
YES / NO NO NO NO NO NO NO NO
Auxiliary electricity consumption
With a full load elmax kW 0,390 0,390 0,470 0,600 0,600 0,600 1,400
With a partial load elmin kW 0 0 0 0 0 0 0
Standby mode PSB kW 0,050 0,050 0,050 0,050 0,050 0,050 0,050
Other elements
Heat dispersion on standby Pstb kW 0,0335 0,0440 0,0690 0,1030 0,1420 0,1670 0,1960
Nitrogen oxides emissions NOx
Mg/kWh 114 114 114 114 114 114 114
For mixed heating appliances
Declared load prole - - - - - - -
Water heating energy e󰀩ciency ƞwh % - - - - - - -
Daily consumption of electricity Qelec kWh - - - - - - -
Daily consumption of fuel Qfuel kWh - - - - - - -
Internal sound power level Lwa dB (A) - - - - - - -
Seasonal DHW e󰀩ciency class - - - - - - -
*Appliances not covered by Directive 2009/15 / EC )

16
OIL FIRED XC-K oil 500 oil 650 oil 850 oil 1000 oil 1300 oil 1550
Element Symbol Unit
E󰀨ective nominal output Prated kW
E󰀩cienza energetica stagionale del
riscaldamento d’ambiente ƞs%
Season e󰀩ciency class to
discharge * * * * * *
For boilers to heat the room and mixed boilers: useful heat output
Useful heat output with
high temperature capacity
(Tr 60 °C / Tm 80 °C)
P4kW
Rated heat output e󰀩ciency
with high temperature capacity
(Tr 60 °C / Tm 80 °C)
ƞ4%
Useful power at 30% of the rated heat
output with low temperature
capacity (Tr 30 °C)
P1kW
Performance at 30% of the rated heat
output with low temperature
capacity (Tr 30 °C)
ƞ1%
Boiler with output range adjustment:
YES / NO
Auxiliary electricity consumption
With a full load elmax kW
With a partial load elmin kW
Standby mode PSB kW
Other elements
Heat dispersion on standby Pstb kW
Nitrogen oxides emissions NOx
Mg/kWh
For mixed heating appliances
Declared load prole
Water heating energy e󰀩ciency ƞwh %
Daily consumption of electricity Qelec kWh
Daily consumption of fuel Qfuel kWh
Internal sound power level Lwa dB (A)
Seasonal DHW e󰀩ciency class
*Appliances not covered by Directive 2009/15 / EC )

17
Technical features
ENGLISH
GAS FIRED XC-K oil 69 oil 100 oil 150 oil 230 oil 300 oil 350 oil 400
Element Symbol Unit
E󰀨ective nominal output Prated kW 66 86 134 202 279 327 385
E󰀩cienza energetica stagionale del
riscaldamento d’ambiente ƞs% 94 94 94 94 94 94 94
Season e󰀩ciency class to
discharge A A A A A A A
For boilers to heat the room and mixed boilers: useful heat output
Useful heat output with
high temperature capacity
(Tr 60 °C / Tm 80 °C)
P4kW 66 86 134 202 279 327 385
Rated heat output e󰀩ciency
with high temperature capacity
(Tr 60 °C / Tm 80 °C)
ƞ4% 88,1 88,1 88,1 88,2 88,3 88,4 88,5
Useful power at 30% of the rated heat
output with low temperature
capacity (Tr 30 °C)
P1kW 21,9 28,9 44,9 67,3 93,0 109,0 128,2
Performance at 30% of the rated heat
output with low temperature
capacity (Tr 30 °C)
ƞ1% 98,2 98,2 98,2 98,2 98,2 98,2 98,2
Boiler with output range adjustment:
YES / NO NO NO NO NO NO NO NO
Auxiliary electricity consumption
With a full load elmax kW 0,350 0,350 0,350 0,530 0,600 0,600 0,700
With a partial load elmin kW 0 0 0 0 0 0 0
Standby mode PSB kW 0,050 0,050 0,050 0,050 0,050 0,050 0,050
Other elements
Heat dispersion on standby Pstb kW 0,0335 0,0440 0,0690 0,1030 0,1420 0,1670 0,1960
Nitrogen oxides emissions NOx
Mg/kWh 64 64 64 64 64 64 64
For mixed heating appliances
Declared load prole - - - - - - -
Water heating energy e󰀩ciency ƞwh % - - - - - - -
Daily consumption of electricity Qelec kWh - - - - - - -
Daily consumption of fuel Qfuel kWh - - - - - - -
Internal sound power level Lwa dB (A) - - - - - - -
Seasonal DHW e󰀩ciency class - - - - - - -
*(Appliances not covered by Directive 2009/15 / EC )

18
GAS FIRED XC-K oil 500 oil 650 oil 850 oil 1000 oil 1300 oil 1550
Element Symbol Unit
E󰀨ective nominal output Prated kW
E󰀩cienza energetica stagionale del
riscaldamento d’ambiente ƞs%
Season e󰀩ciency class to
discharge * * * * * *
For boilers to heat the room and mixed boilers: useful heat output
Useful heat output with
high temperature capacity
(Tr 60 °C / Tm 80 °C)
P4kW
Rated heat output e󰀩ciency
with high temperature capacity
(Tr 60 °C / Tm 80 °C)
ƞ4%
Useful power at 30% of the rated heat
output with low temperature
capacity (Tr 30 °C)
P1kW
Performance at 30% of the rated heat
output with low temperature
capacity (Tr 30 °C)
ƞ1%
Boiler with output range adjustment:
YES / NO
Auxiliary electricity consumption
With a full load elmax kW
With a partial load elmin kW
Standby mode PSB kW
Other elements
Heat dispersion on standby Pstb kW
Nitrogen oxides emissions NOx
Mg/kWh
For mixed heating appliances
Declared load prole
Water heating energy e󰀩ciency ƞwh %
Daily consumption of electricity Qelec kWh
Daily consumption of fuel Qfuel kWh
Internal sound power level Lwa dB (A)
Seasonal DHW e󰀩ciency class
*Appliances not covered by Directive 2009/15 / EC )

19
Technical features and dimensions
ENGLISH
3INSTALLATION INSTRUCTIONS
ATTENTION!
This boiler is intended solely for the use for
which it was expressly designed. Any other
use is to be considered improper and there-
fore dangerous.
This boiler heats water at a temperature
lower than the atmospheric pressure boiling
temperature.
ATTENTION!
The appliances are designed to be installed
inside suitable rooms or technical spaces
only. The appliances cannot be installed or
operate outdoors. Outdoor installation can
cause malfunctioning and be dangerous.
Choose specifically designed appliances for
outdoor installation.
Before connecting the boiler, have profes-
sionally qualied personnel:
a) Thoroughly wash all the piping of the sys-
tem to remove any residues or impurities,
which could jeopardise proper operation
of the boiler.
b) Check that boiler is set up to operate with
the available type of fuel.
This can be seen written on the package
and on the technical feature plate;
c) Check that the chimney/flue has an
appropriate draught, without any bottle-
necks, and that no exhausts from other
appliances are inserted, unless the ue
has been implemented to accommodate
several utilities according to specific
standards and regulations in force. Only
after this check can the tting between
the boiler and chimney be mounted;
ATTENTION!
If there is dust and/or if there are aggressive/
corrosive vapours present in the installation
room, the appliance must be protected
suitably and must be able to operate
independently from the air in the room.
ATTENTION!
The appliance must be installed by a qualified
technician with the technical-professional
requirements according to law which, under his
own responsibility, guarantees compliance
with standards according to good practice
rules.
ATTENTION!
Mount the appliance respecting the minimum
distances required for installation and main-
tenance.
The boiler must be connected to a central
heating system and/or domestic hot water
supply network compatible with its e󰀩ciency
and output.
3.1 - GENERAL WARNINGS
3.2 - STANDARDS FOR INSTALLATION
It must be installed by a professionally qualied technician, who
shall take the responsibility of observing all local and/or
national laws published in the o󰀩cial journal, as well as
the applicable technical standards.
NOTE!
For further details relating to the stand-
ards, rules and regulations for safe in-
stallation of the thermal unit, refer to the
section "Technical Information" on the
boiler page of the www.unicalag.it website

20
fig. 11
x = not less than the length of the boiler body
(dimensions in mm); in any case, never less than 1300 mm.
xx = see instructions to the side.
3.4 - POSITIONING IN BOILER
ROOM
The boiler must be installed in compliance with standards and
prescriptions in force.
The room must be well ventilated by openings with a total surface
no less than 1/30 the surface of the boiler room, with a minimum
of 0.5 m².
The ventilation openings must be permanent, communicate
directly with the outside and be positioned high or low according
to standards in force.
The location of the ventilation openings, the fuel supply circuits,
electric energy supply and lighting must comply with current legal
provisions in relation to the type of fuel used.
It is recommended to install the boiler as close to the chimney
connection as possible.
To make it easier to clean the smoke circuit, in front of the boiler,
there must be a free space no less than the length of the boiler
body and, in any case, never less than 1300 mm. Check that
with the door opened 90°, the distance between the door and
the adjacent wall is at least the length of the burner.
The boiler can be placed directly on the oor as it is equipped
with a base.
However it is useful to provide a at, level cement plinth capable
of bearing the weight of the boiler full of water.
When positioned on the plinth, the dimensions must be at least
Q x R (see dimensions table).
When installation has been performed, the boiler must be perfectly
horizontal and stable (to reduce vibrations and noise).
3.3 - HANDLING
The boiler can be handled easily, lifting it by means
of upper hooks or shifting it on rollers underneath
the sturdy base longerons.
If necessary for clearance purposes, the door and
3.5 - BURNER
The burners operating with the XC-K boilers must have the EC
certication and comply with:
- Gas appliance directive (2009/142/EEC);
- EMC Directive - Electromagnetic Compatibility ((2014/30/UE).
They must also be approved according to the specications:
- EC 1-2009 UNI EN 676 - air-blown burners for gaseous fuel.
3.5.1 - CHOOSING THE BURNER
The correct choice and adjustment of the burner are fundamental
for optimal operation of the boiler and therefore must be done
carefully and not underestimated.
The burner must be chosen verifying that its ring rate (fuel
capacity - combustion chamber pressure) is compatible with the
same features declared for the boiler.
Remember that pressure drops on the ue side of the boiler,
namely combustion chamber backpressure, refer to zero
pressure at the base of the chimney.
It is also recommended that the burner blast tube be no shorter
than the minimum dimension shown in the following table and
that the ame which must be implemented be suitable for the
characteristics of the combustion chamber.
In order to take advantage of the whole heat exchange surface
of the blind bottom furnaces, use burners capable of providing
a “long and narrow” ame in any operating condition, namely
even at the minimum output when controlling two or more stages
or modulating.
Flames which are too short cause overheating in the front of
the furnace and combustion products, not su󰀩ciently cooled,
entering the smoke pipes at too high temperatures can seriou-
sly damage the generator.
The manufacturing companies of the burners can supply the
dimensions of the ames which their appliances develop,
the smoke chamber can be removed to make it easier to enter
the boiler room.