Hamworthy VARMAX 120 User guide

IMPORTANT NOTE
THESE INSTRUCTIONS MUST BE READ
AND UNDERSTOOD BEFORE INSTALLING,
COMMISSIONING, OPERATING OR
SERVICING EQUIPMENT
INSTALLATION, COMMISSIONING AND
SERVICING INSTRUCTIONS
Models: 120 to 600 kW
Varmax Boilers

Customer After Sales Services
Telephone: [phone] E-mail: [email protected] Fax: [phone]
Technical Enquiries
To supplement the detailed technical brochures, technical advice on the application and use of products in the Hamworthy
Heating range is available from our technical team in Poole and our accredited agents.
Site Assembly
Hamworthy offer a service of site assembly for many of our products where plant room access is restricted. Using our trained staff
we offer a higher quality of build and assurance of a boiler built and tested by the manufacturer.
Commissioning
Commissioning of equipment by our own engineers, accredited agents or specialist sub-contractors will ensure the equipment is
operating safely and efciently.
Service Contracts
Regular routine servicing of equipment by Hamworthy service engineers inspects the safety and integrity of the plant, reducing the
risk of failure and improving performance and efciency. Service contracts enable you to plan and budget more efciently.
Breakdown service, repair, replacement
Hamworthy provide a rapid response breakdown, repair or replacement service through head ofce at Poole and accredited
agents throughout the UK.
Spare Parts
We offer a comprehensive range of spare parts, providing replacement parts for both current and discontinued products. Delivery
options are available to suit you. Please refer to our website for more details.

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VARMAX - Installation, Use and Maintenance
CONTENTS
1. WARNINGS AND RECOMMENDATIONS...........................................................................5
1.1. Transport and storage ................................................................................................................................... 5
1.2. Symbols used in this document. ................................................................................................................... 5
1.3.Qualicationofpersonnelforinstalling,adjusting,usingand
maintaining the equipment ............................................................................................................................ 5
1.4. Safety instructions......................................................................................................................................... 5
1.5. Water characteristics..................................................................................................................................... 6
2. APPROVALS .........................................................................................................................9
2.1. Compliance with European Directives .......................................................................................................... 9
2.2. Regulatory installation conditions.................................................................................................................. 9
2.3. Gas category................................................................................................................................................. 9
2.4. Gas supply pressures ................................................................................................................................. 10
3. TECHNICAL SPECIFICATIONS ........................................................................................12
3.1. Dimensions ................................................................................................................................................. 12
3.2. Doorways .................................................................................................................................................... 14
3.3. Reduced access (depending on model)...................................................................................................... 15
3.4. Combustion at 15°C and 1013 mbar........................................................................................................... 16
3.5. Conditions of use ........................................................................................................................................ 18
3.6. Electrical connection ................................................................................................................................... 18
4. INSTALLATION ...................................................................................................................19
4.1. Handling and moving the boiler .................................................................................................................. 19
4.2.Installationoftheairlterandltermatting................................................................................................. 19
4.3. Installing the boiler ...................................................................................................................................... 20
4.4. Opening / closing of casing doors ............................................................................................................... 21
4.5. Removing the control panel (MMI) .............................................................................................................. 21
4.6.Removing/rettingthecasingdoors.......................................................................................................... 22
4.7.Removing/rettingsidepanels .................................................................................................................. 23
4.8.Removing/rettingthetoppanel ............................................................................................................... 23
4.9. Step............................................................................................................................................................. 24
4.10.Changing the gas type (G20 to G31) ......................................................................................................... 25
4.11.Exhaust connection .................................................................................................................................... 27
4.12.Hydraulic connection .................................................................................................................................. 36
4.13.Gas connection .......................................................................................................................................... 40
4.14.Electrical connection .................................................................................................................................. 41

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5. COMMISSIONING ...............................................................................................................45
5.1. Unlocking the boiler..................................................................................................................................... 45
5.2. Pre-commissioning checks ......................................................................................................................... 45
5.3. Commissioning............................................................................................................................................ 46
6. POST-COMMISSIONING CHECK .....................................................................................47
6.1. Condensate removal ................................................................................................................................... 47
6.2. Gas supply .................................................................................................................................................. 47
6.3. Full power cuts ........................................................................................................................................... 47
7. MAINTENANCE OPERATIONS.........................................................................................48
7.1. Boiler draining ............................................................................................................................................. 49
7.2.Vericationoftheboiler'senvironment........................................................................................................ 49
7.3.Replacingtheairltermatting..................................................................................................................... 49
7.4.Vericationofignitionandionisationelectrodes ......................................................................................... 50
7.5. Siphon cleaning........................................................................................................................................... 51
7.6.Checkingthecombustioncircuit'sgas-tightness......................................................................................... 51
7.7. Checking combustion quality ...................................................................................................................... 52
7.8. Setting the gas valve................................................................................................................................... 53
7.9.Gasltercleaning ....................................................................................................................................... 56
7.10.Cleaning exchangers and changing seals.................................................................................................. 57
7.11.Cleaning the burner and changing the seals .............................................................................................. 59
8. END-OF-LIFE CYCLE OF THE APPARATUS ..................................................................62
9. HYDRAULIC DIAGRAMS AND SETTINGS......................................................................63
9.1.Selectionowdiagram ................................................................................................................................ 63
9.2. Symbols used in the diagrams .................................................................................................................... 65
9.3. List of diagrams........................................................................................................................................... 65
9.4.Speciccongurationswhenconnectingto0-10Voutputs(Ux) ............................................................... 122
10. LIST OF SPARE PARTS...................................................................................................126
11. TABLE OF CUSTOMER SETTINGS ...............................................................................139
12. ANNEX A............................................................................................................................155

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1. WARNINGS AND RECOMMENDATIONS
PLEASE READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
CARRYING OUT MAINTENANCEAND USING THE BOILER. IT CONTAINS
IMPORTANT SAFETY INFORMATION.
1.1. Transport and storage
The boiler:
- must be stored vertically in an environment where the temperature is
between-20°Cand+55°C, and whererelativehumidityis between 5%
and95%;
-mustnotbestacked,
- must be protected from humidity.
1.2. Symbols used in this document.
INFORMATION: This symbol draws attention to comments.
WARNING: Not following these instructions may lead to
damagewheninstallingortootherobjects.
DANGER: Not following these instructions may cause
injuriesandseriousmaterialdamage.
DANGER: Not following these instructions may cause
electrocution.
1.3. 
maintaining the equipment
Boiler installation, adjustment and maintenance operations must be
conducted by a qualied and approved professional in accordance with
prevailing local and national regulations. These operations may require work
to be carried out with the power turned on and the casing doors (on the front
of the boiler) open.
Basic utilisation operations must be carried out with the casing doors closed.
1.4. 
• Always switch the boiler o󰀨 and shut o󰀨 the general gas supply before
carrying out any work on the boiler.
• Afterperformingwork ontheboiler (maintenance orbreakdown),check
that there are no gas leaks from the installation.
INFORMATION:
VARMAX boilers are available with 2/3 tappings or 4 tappings. It is not

4 tappings and vice versa.

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DANGER:

• 
contacts or switches.
• 󰀨
• Air the premises.
• 
DANGER:

• 󰀨
• Air the premises.
• 
DANGER:
This boiler's earth bonding is ensured with connecting cables (green/

make sure you reconnect the cables concerned; it is IMPERATIVE to
reuse the original attachment screws.
1.5. Water characteristics
The following rules apply as soon as the boiler is commissioned and remain
validuntiltheproduct'send-of-life.
DANGER: 
1.5.1. Preparation of the water circuit before commissioning the boiler
Forallinstallationwork(neworrenovation),thewaternetworkpipesmustbe
meticulously cleaned. The purpose of cleaning prior to commissioning is to
remove germs and residues which are the cause of deposits.
In new installations in particular, residue from grease, oxidised metal and
even copper micro deposits must be removed.
Inrenovatedinstallations,cleaningshouldfocusonremovingsludgeandthe
products of corrosion formed when the unit was last in operation.
There are two types of methods for cleaning and removing sludge: a high
intensity approach that takes a few hours and a slower, more gradual
approachthattakesseveralweeks.Thisrsttypeofcleaningmustbedone
beforeconnectingthenewboiler,andwiththesecondtype,altershouldbe
installed on the back of the boiler to capture loosened deposits.
Cleaning prior to commissioning helps to improve the equipment's
performance, reduce energy consumption and ght against scaling and
corrosion. This operation must be done by a professional (water treatment).

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1.5.2. Protecting the unit against scaling
Water naturally contains dissolved calcium ions and carbonates that cause
scaling (calcium carbonate) to form. To prevent excessive deposits, take
precautionswithregardtothewaterusedtolltheunit
Water must be added during the life of the boiler. The new water adds scaling
tothewater system.The amountofll waterandthe amountofmake-up
wateraddedthroughouttheunit'slifecyclemustnotbemorethanthreetimes
thewatercapacityoftheheatingsystem.Also,thehardnessofthemake-up
water must be controlled. Make-up water: 
Addingalargeamount ofuntreatedwateralwayscontributes asignicant
amountofscaling.Tomonitorthisandtodetectproblems,asystemwater
meter must be installed.
Failuretocomplywiththeseguidelines(suchthatthellwaterplusthemake-
up water is more than three times the water capacity of the heating system)
requires a full cleaning (to remove sludge and scaling) to be performed.
Additional precautions are required for operation:
- Whentheunithasawatersoftener,theequipmentmustbeinspected
on a regular basis in order to ensure that it is not outputting chloride-
rich water into the system. The concentration of chlorides must always
remain below 50 mg/litre.
- To prevent the build-up of calcium deposits (such as on exchange
surfaces), the unit should be brought into service slowly, starting by
operatingatalowpowerwithhighprimarywaterow.
- When the tap water lacks the desired qualities (e.g. high level of
hardness),water treatment isrequired.Thell watermust be treated,
and whenever new water is added, the make-up water must also be
treated.
- Installations with multiple boilers require all of the boilers to be started
simultaneously at minimal power. Doing this prevents the calcium in the
waterfromdepositingontheexchangesurfacesoftherstboiler.
- Whenworkingontheunit,avoiddrainingitcompletely;onlytherequired
parts of the system are to be drained.
The rules listed above are designed to minimise scaling on the exchange
surfaces and thus to increase the life of the boilers.
To optimise the equipment's operation, remove lime scale deposits. This
mustbedonebya specialised company.Also,beforeputtingtheunitinto
service,verifythattheheatingsystemisnotdamaged(e.g.leaks).Ifithas
excessivescaling,theunit'ssettingsforoperation andforwatertreatment
mustbeadjusted.
1.5.3. Protecting steel and stainless steel boilers against corrosion
Corrosion can a󰀨ect the iron components used in boilers and heating
systems, which is directly related to the presence of oxygen in the water
heater'swater.Dissolvedoxygenthatenterstheunitwhenitisbeinglled
forthersttimereactswiththeequipmentmaterialsandquicklydisappears.
Withoutrefreshingtheoxygenthroughsignicantcontributionsofwater,the
unit might not experience any damage whatsoever.
However,itisimportanttofollowthesizingrulesandinstallationguidelines
inordertopreventoxygenfromcontinuouslyowingintotheheatingwater.

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These rules include:
- Opt for an expansion vessel with a membrane rather than an open
expansion vessel that allows direct passage.
- Make sure pressure in the equipment is more than 1 bar when cold.
- Remove non-gas-tight components (permeable) and use gas-tight
equipment instead.
Iftheguidelinesabovearefollowed,theunit'ssystemwaterhastheproper
characteristics to last a long time: 8.2 < pH < 9.5 and concentration in
dissolved oxygen < 0.1 mg/litre.
Ifthereisachancethatoxygencouldentertheunit,youmusttakeadditional
precautions. Adding an oxygen scavenger (e.g. sodium sulphite) is highly
recommended. We recommend you contact specialised companies for
watertreatmentissues,whichwillbeabletosuggest:
- theappropriatetreatmentbasedonthecharacteristicsoftheinstallation,
- a monitoring and performance warranty contract.
Forunitsinwhichthewatercomesintocontactwithheterogeneousmaterials,
suchascopperoraluminium,appropriatetreatmentisrecommendedinorder
toensurethattheunitwilllast.Inmostcases,thisconsistsofaddingcorrosion
inhibitors (in the form of chemical solutions) to the unit. It is recommended to
contact water treatment specialists.
1.5.4. Unit monitoring
Iftheaboverecommendationsarefollowed(newinstallationorrenovation),
itshouldbesu󰀩cientto:
- checktheamountofmake-upwater(llwatervolume+make-upwater
volume < 3 times the unit volume.
- check the pH level (stable or slightly increasing).
- check the TH (stable or slightly decreasing).
We recommend these checks are carried out 2 to 3 times a year. Note that
monitoring the quantity of make-up water is critical to the long life of the unit.
Ifanyofthesethreeparametersdeviatesfromtheaboverecommendations,
refer to a water treatment specialist to correct the problem.
1.5.5. Installation of the plate exchanger
If the recommendations above cannot be met, you can set up a plate
exchangertoseparatetheprimarysystemfromthesecondarysystem,which
protectstheboilerfromundesirablee󰀨ects.
1.5.6. Installation of a ltration system
A ltration system (lter, sediment well, etc.) on the back of the boiler is
recommended in order to remove suspended particles from the unit.

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2.2. Regulatory installation conditions
The appliance must be installed by an approved professional in accordance
with regulations and current professional practices.
2.3. Gas category
Thisboilerhasbeenadjustedinthefactorytoworkwithgroup H (type G20)
.
INFORMATION: 
Category
DK, EE, FI, HU,
LV, NO, SE, TR
CZ, GR, GB, IE,
LT, RO, SI, SK
VARMAX 120 to 225 B23 - B23 P I2H
II2H3P
C13 - C33 - C53 I2H
VARMAX 275 to 320 B23 - B23 P I2H
II2H3P
C53 I2H
VARMAX 390 to 600 B23 - B23 P I2H I2H
C53
2. APPROVALS
2.1. Compliance with European Directives
- Low voltage (2014/35/UE)
This appliance is not intended for use by persons (including children)
whose physical, sensory or mental abilities are reduced, or persons
without experience or knowledge, unless they have been able to
benet,throughsomeoneresponsiblefortheirsafety,fromsupervision
or prior instruction concerning the use of the appliance.
Children must be supervised to ensure they do not play with the
appliance.
- Electromagnetic compatibility (2014/30/UE)
- Gas appliances (2016/426/UE)
󰀩

In application of the directive and according to the requirements of
the EU regulation No. 813/2013 of 02 August 2013, the technical
parameters of condensation boilers with a power of less than or equal
to 400 kW are available in appendix A.
- WEEE (2012/19/UE)
Waste Electrical and Electronic Equipment. See chapter 8.

10 / 156 00BNO9168-I (U0606551)
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2.4. Gas supply pressures
INFORMATION: The pressures given below must be read at the gas valve inlet.
Natural gas H G20 G31 Propane gas
(for relevant models
and countries only)
20 mbar
Nominal pressure (mbar) 20 37
Minimum pressure (mbar) 17 25
Maximum pressure (mbar) 25 45

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?

12 / 156 00BNO9168-I (U0606551)
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U0501956-B
øX
A
B
45 mini 60 maxi
3°
C
D
E
F
G
HI
JK
L
M
N
O
P
øW
Q
øV
øX
øX
øX
øT
øU
øU
(B23-B23P)
Y
Z
øAA
K
Condensate
drain
AB
AC
ø25
L
R
R
S
Only on 4-point models
3. TECHNICAL SPECIFICATIONS
3.1. Dimensions
gure 1 - Dimensions
INFORMATION : The visuals below represent boilers with smoke nozzle and hydraulic
connections (start / return) that can not be dismantled.

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MODELS
120 140 180 225 275 320 390 450 525 600
A (mm) 734 734 812 912 1161
B (mm) 1530 1780 1877 2023 2016
C (mm) 1181 1202 1328 1372 1588
D (mm) 148 169 171 168 208
E (mm) 103 150 89 92 92
F (mm) 510 630 680 750 750
G (mm) 138,5 138,5 138,5 138,5 138,5
H (mm) 115 192 241 274,5 390,5
I (mm) 350,5 350,5 399,5 449,5 577,5
J (mm) 150,5 150,5 200 209,5 325,5
K (mm) 166,5 150,5 179 192 232
L (mm) 1256 1564 1672 1874 1851,5
M (mm) 165 165 165 165 165
N (mm) 182 197,5 196,5 206,5 196,5
O (mm) 926 1171 1265 1402 1402
P (mm) 1062 1315 1413 1577,5 1555
Q (mm) 1298 1606 1661 1933 1778
R (mm) 212 212 244 244 244
S (mm) 163 163 163 183 183
Ø T(*): Smoke outlet (mm) 150 150 180 200 200
Ø U: Purge connecting sleeve G 1 " G 1 " G 1 " G 1 " G 1 "
Ø V(*): Air inlet (mm) 150 150 180 180 180
Ø W: Gas connecting sleeve G20
G31
R 1 " 1/4
R 1 " 1/4
R 1 " 1/2
R 1 " 1/2
R 2 "
R 2 "
R 2 "
--
R 2 "
--
Ø X: Out / In connecting sleeve Mail thread
R 2 "
Flange PN16
DN 65
Flange PN16
DN 80
Flange PN16
DN 80
Flange PN16
DN 80
Y (mm) 250,5 246 276 289,5 328,5
Z (mm) 237 224,5 270,5 283,5 323,5
Ø AA: Valve connecting sleeve G 1 " G 1 " 1 " 1/4 G G 1 " 1/4 G 1 " 1/4
AB (mm) ≈130 ≈130 ≈130 ≈130 ≈136
AC (mm) ≈110 ≈110 ≈110 ≈120 ≈196
(*) The diameter indicated is the inside diameter (only for Ø T and Ø V).

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3.2. Doorways
VARMAX120to225boilerstthroughdoors700mmwidewiththecasing
on(boilerwithdoorsandsidejackets).
VARMAX275to320boilerstthroughdoors735mmwidewithoutthecasing
on (boiler without doors, without side jackets and without side insulating
panels).
However,it is possible to passthrough the700 mmdoors ifthe following
partsareremoved,inadditiontothepartsmentionedabove:
• thetwoinspectiondoorswiththeir16fasteningclamps,
• thetwolowerhingelugsofthefronthousingdoors(withthestep),
• thetwoupperhingelugsofthefronthousingdoors(withthestep),
• all the cable clamps at the inlet of the high- and low- current wiring
gutter.
VARMAX390to450boilerstthroughdoors800mmwidewithoutthecasing
on,whichmeansthatthefollowingpartsmustberemoved:
• thetwofronthousingdoors,
• thesideinsulatingjackets,
• the side insulating panels
• thetwolowerhingelugsofthefronthousingdoors(withthestep),
• thetwoupperhingelugsofthefronthousingdoors(withthestep),
• all the cable clamps at the inlet of the high- and low- current wiring
gutter.
VARMAX 525 to 600 boilers t through doors 1100 mm wide without the
casingon,whichmeansthatthefollowingpartsmustberemoved:
• thetwofronthousingdoors,
• thesideinsulatingjackets,
• the side insulating panels
• thetwolowerhingelugsofthefronthousingdoors(withthestep),
• thetwoupperhingelugsofthefronthousingdoors(withthestep),
• all the cable clamps at the inlet of the high- and low- current wiring
gutter.

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IMPORTANT:
           
󰀨
The tightening torques are:
Gas nozzle = 12 Nm
Outlet or return taps = 41 Nm
Check the seals:
Water (outlet and return taps)
Gas and condensation (nozzle)
3.3. Reduced access (depending on model)
Aftertheproductisunpacked,thereturntapping(models275to600)andthe
gasnozzle(allmodels)mayberemoved.
Afterdismantlingtotheheatingbody,theoutlettapping(models275to6050)
may also be removed.
Removable parts
U0604510-#
H
P
B
P
HHT
PHT
120 140 180 225
HHT (mm) 1271 1620
PHT (mm) 1085 1114
B (mm) 107 107
HHTD (mm) -- --
PHTD (mm) -- --
H (mm) -- --
P (mm) -- --
HHTD
PHTD
275 320 390 450 525 600
HHT
(mm) 1677 1944 1804
PHT
(mm) 1237 1289 1510
B
(mm) 107 108 108
HHTD
(mm) 1459 1585 1716
PHTD
(mm) 1085 1137 1355
H
(mm) 218 359 88
P
(mm) 152 152 140

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3.4.1. G20 Natural Gas
MODELS
120 140 180 225 275 320 390 450 525 600
Nominal power Pn
(80/60°C) kW 117 136 175 219 268 312 381 439 513 586
Nominal power when
condensing P (50/30°C) kW 127 148 191 238 290 338 415 478 558 637
Nominal heat input Qn kW 120 140 180 225 275 320 390 450 525 600
Minimum heat input
Qmin
Qn
Qall
Qmin
kW 28 28 43 43 66 66 87 87 120 120

Qn
Qall
Qmin
m3/h 12,7
14,8
14,81
17,2
19,05
22,1
23,81
27,7
29,1
33,8
33,86
39,3
41,3
48,0
47,6
55,3
55,6
64,6
63,5
73,8
CO2value ranges %Qmin:8,3%<CO2<8,7%
Qmax:8,8%<CO2<9,2%

(80/60°C)
Qn
Qall
Qmin
g/s
52,8
--
13,0
61,3
--
13,1
80,4
--
20,8
99,5
--
21,1
113,9
46,0
26,9
133,2
46,0
29,1
169,0
64,2
39,2
200,7
64,2
35,6
232,1
--
55,5
262,4
--
55,8

(50/30°C)
Qn
Qall
Qmin
g/s
49,1
--
12,3
57,6
--
12,2
75,9
--
19,5
93,0
--
19,5
108,7
42,9
27,1
126,3
42,9
27,1
159,6
61,1
36,7
191,0
61,1
33,4
228,1
--
55,8
255,6
--
55,5
Flue-gas temperature
(80/60°C)
Qn
Qall
Qmin
°C
60,8
--
56,9
62,1
--
57,3
61,0
--
56,6
62,3
--
57,7
61,7
58,7
58,3
63,4
58,7
57,2
62,5
58,5
57,4
64,8
58,5
57,1
64,4
--
57,8
66,6
--
57,5
Flue-gas temperature
(50/30°C)
Qn
Qall
Qmin
°C
35,7
--
28,8
37,7
--
30,2
33,7
--
30,0
36,9
--
30,2
36,3
30,8
29,8
36,2
30,8
28,3
36,7
30,5
30,0
41,7
30,5
30,2
48,0
--
33,1
47,8
--
29,6
Appliance pressure at
nominal Qcal (B23) Pa 88 108 103 147 132 162 152 203 168,4 225,2

gas output mm 150 150 150 150 180 180 200 200 200 200
Maximum allowable
nozzle pressure (B23P)
(80/60°C)
Qn
Qall
Qmin
Pa
200
--
5
200
--
5
115
--
5
165
--
5
122
18
5
176
18
5
180
18
5
193
18
5
160
--
5
200
--
5
Maximum allowable
nozzle pressure (B23P)
(50/30°C)
Qn
Qall
Qmin
Pa
166
--
5
164
--
5
92
--
5
128
--
5
97
16
5
145
16
5
155
16
5
173
16
5
183
--
5
164
--
5

rate at Qn m3/h 153,8 179,4 230,7 288,3 352,4 410,1 499,8 576,7 672,8
768,9
NOx class 6
Flue-gas removal and air inlet type

B23,B23P
C13,C33,C53
B23,B23P
C53
3.4. Combustion at 15°C and 1013 mbar

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3.4.2. G31 Propane Gas (for relevant models and destination countries)
MODELS
120 140 180 225 275 320
Nominal power Pn (80/60°C) kW 117 136 175 219 268 312
Nominal power when condensing P
(50/30°C) kW 127 148 191 238 290 338
Nominal heat input Qn kW 120 140 180 225 275 320
Minimum heat input Qmin kW 39 39 63 63 90 90
 m3/h 4,91 5,73 7,36 9,21 11,25 13,09
CO2value ranges %Qmin:9,8%<CO2<10,2%
Qmax:10,4%<CO2<10,8%

Qn
Qall
Qmin
g/s
53,0
--
18,3
61,8
--
18,3
80,0
--
29,0
100,0
--
29,0
122,0
49,7
42,0
142,0
49,7
42,0

Qn
Qall
Qmin
g/s
50,2
--
17,3
58,7
--
17,3
80,0
--
28,0
96,0
--
28,0
117,0
47,6
39,0
136,0
47,6
40,0
Flue-gas temperature (80/60°C)
Qn
Qall
Qmin
°C
60,3
--
56,7
62,6
--
56,7
60,3
--
57,1
62,2
--
57,6
63,0
58,8
58,0
65,4
58,8
58,4
Flue-gas temperature (50/30°C)
Qn
Qall
Qmin
°C
34,6
--
30,6
37,1
--
28,9
37,1
--
31,0
37,0
--
29,4
40,0
30,8
29,0
41,4
30,8
30,5
Appliance pressure at nominal Qcal (B23) Pa 68 95 102 140 123 165
 mm 150 150 150 150 180 180
Maximum allowable nozzle pressure
(B23P) (80/60°C)
Qn
Qall
Qmin
Pa
167
--
12
200
--
8
103
--
4
136
--
24
118
19
11
157
19
11
Maximum allowable nozzle pressure
(B23P) (50/30°C)
Qn
Qall
Qmin
Pa
140
--
16
169
--
11
66
--
7
104
--
7
104
17
16
138
17
13
 m3/h 153,8 179,4 230,7 288,3 352,4 410,1
NOx class 6
Flue-gas removal and air inlet type
 B23,B23P

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3.5. 
MODELS
120 140 180 225 275 320 390 450 525 600
Maximum start setting temperature °C 85
Minimum start setting temperature °C 8
Start maximum temperature °C 92
 °C 110
Maximum service pressure hPa
(bar)
6000
(6)
Minimum cold pressure hPa
(bar)
1000
(1)

daPa
version with 2 or 3 tappings 600 750 570 810 820 1185 770 970 860 1070
version with 4 tappings
Main exchanger
Condenser
500
110
650
120
440
55
660
75
790
50
1060
65
660
190
840
230
720
350
930
450
 m3/h 5,0 5,8 7,5 9,4 11,5 13,4 16,4 18,9 22,1 25,2
 m3/h 10,0 11,6 15,0 18,8 23,0 26,8 32,8 37,8 44,1 50,4
Water content L116 116 151 151 239 239 287 287 420 420
Weight without water kg 340 340 393 393 502 502 592 592 800 800
Sound power at Pmax (Lw) * dB(A) 73 76 77 84 --
Sound pressure at 1 m at Pmax (Lp) dB(A) 57 61 61 68 --

(min. / max.) °C 5 / 45
 between5%and95%
Protection level IP20
 m2000
* The sound power level is a laboratory measurement of the emitted sound power but contrary to the noise
level,itdoesn'tcorrespondtotheperceivedmeasurement.
3.6. Electrical connection
MODELS
120 140 180 225 275 320 390 450 525 600
Electrical supply V230VAC(+10%-15%),50Hz
Electrical power consumption at
Qn (without accessories) W 204 311 179 320 238 352 480 660 697 960
Electrical power consumption in
standby mode W 5 7
 m
DHW sensor: 10
External sensor: 40 in 0.5 mm² (120 in 1.5 mm²)
Ambient thermostat: 200 in 1.5 mm²
Ambient sensor: 200 in 1.5 mm²
Power terminal output
V230VAC(+10%,-15%)
5 mA - 1A
A

14.09.2020 19 / 156
VARMAX - Installation, Use and Maintenance
4. INSTALLATION
4.1. Handling and moving the boiler
DANGER: 
(not supplied). This is COMPULSORY.
4.2. 
WARNING: 

U0502530-#
gure 2 - Air lter
protective
label
airlter
gure 3 - Filter matting
U0024791-B
mountings
U0038318-B
Models 390 to 600:
Models 120 to 320:
- Remove the protective "air intake" label.
-Inserttheairlterandattachittotheboiler
usingthe4screwssuppliedwiththelter.
All models:
-Inserttherectangularltermattingbetweenthe
lter's protective grille and the mounting (see
opposite).


Models 390 and 600:
-Insertthesquarelterclothonthebackgateof
thelter.
WARNING :
   
only.


The following indication is applicable only for the 525 and 600 kW
models.

20 / 156 00BNO9168-I (U0606551)
VARMAX - Installation, Use and Maintenance
gure 4 - Peripheral clearance
4.3. Installing the boiler
VARMAXboilersmustnotbeinstalledonaninammablesurface(wooden
oor,plasticoorcovering,etc.).

Ensurethereissu󰀩cientclearancesothatworkmaybecarriedouteasily
on the boilers.
The minimum values (in mm) are indicated in gure4 and in the table below.
A B C D H
MODELS
120 450 500 150
140 450 500 150
180 450 500 320
225 450 500 320
275 450 600 500 263
320 450 600 500 263
390 450 700 500 427
450 450 700 500 427
525 450 700 500 427
600 450 700 500 427
           

WARNING: 
their disassembly and reassembly.

A
B
C
D
00BET9005-#
Models 120 to 450 :Top view :
A
B
C
D
Front
Back
Models 525 and 600 :
H
C
A
B
D
H
C
gure 5 - Specic clearances required for
burner maintenance operations
U0038671-C