Gruppo Imar Gimax 25 User manual

Caldaia murale a condensazione
Kondens
ITALIAN DESIGN
MADE IN ITALY
LIBRETTO DI INSTALLAZIONE, PRIMA ACCENSIONE, USO E MANUTENZIONE
Gimax 25-30
Wall-mounted condensing boiler
INSTALLATION, COMMISSIONING, USE AND MAINTENANCE MANUAL

1
GiMax 25-30 MANUAL
VERS. 11/2020 - REV.1

2
TABLE OF CONTENTS
General requirements 2
-EC conformity declarartion 2
-General instructions 2
Use and operation 3
-Description of the boiler 3
-Components 3
-Ignition 4
-Season selection 5
-Temperature regulation 6
-Information menu 7
-
Operation with room thermostat 8
-Operation with external sensor 8
-Operation with
Open-therm timer thermostat 8
-Special functions 9
-Faults 10
-Fault codes table 11
Installation 12
-Operation diagram 12
-Three-way boiler diagram 12
-Electrical wiring diagram 13
-Graphs for the head available
to the system 14
-Installation 14
-Fastening the boiler to the wall 15
-Layout of connections 16
-Plumbing the boiler 16
-Connecting lling tap for central heating
only boilers 17
-Filling the system 17
-Connecting the condensate line 17
-
Connection to the mains gas supply 18
-Connection to the mains electrical system 19
-Combustion gas evacuation
system: compatible applications
20
-Combustion gas
evacuation system: installation 21
-Air intake and combustion gas evacuation
system: important information
23
Adjustment and maintenance 24
-Preliminary maintenance operations 24
-General maintenance operations 24
-Service function 24
-Data plate 26
-Power adjustment 26
-
Testing the gas supply dynamic pressure 27
-Analysis - Checking and regulating
combustion 28
-Changing gas type 30
-Conguration the accessing menu 31
-Conguration menu 32
-Installation of room thermostat/Open-Therm 34
-Installation and conguration
of external temperature sensor 35
-Conguring the climate curve
from those available 36
-Special functions 37
-Thermostat post circulation/ventilation
function 38
-Technical Data sheet 39
GENERAL REQUIREMENTS
Kleine Kessel srl estabilished in Loc. Campogrande, 13 - Carpaneto Piacentino whose processes of design, manufacturing
and after-sales service are in compliance with requirements of UNI EN ISO 9001:2008 - DECLARES that boilers are in
compliance with European Directives and with European Delegates regulations.
Chief Executive Marco Rapaccioli
EC CONFORMITY DECLARATION (ACCORDING TO ISO/IEC 17050-1)
CE CERTIFICATES ARE AVAILABLE ON OUR WEBSITE www.produzionecaldaie.it
GENERAL INFORMATION
This manual, supplied with every boiler, should be
considered as an integral component as it contains
instructions for the correct, safe and appropriate
installation, use and maintenance of the system.
The manual must always be kept by the user of
the boiler and made available for the installation
and/or maintenance technicians to consult. It must
also accompany the boiler if it should be moved
or otherwise transferred.
The manufacturer shall not be held responsible
for any damage caused by failure to follow the
instructions contained in this manual, nor:
If the boiler is used for purposes other than those
for which it was built
If any part or circuit of the boiler is modied
If accessories or kits not approved by the
manufacturer are installed
If ordinary and extraordinary maintenance is not
performed by qualied personnel
If applicable technical and legal requirements
have not been observed during installation and
maintenance of the boiler.
WARNING!
If the boiler should cease to function or not function
correctly, deactivate it immediately by turning it off
and then shutting off the gas supply. Do not attempt
any repairs or direct work on the boiler.
Only personnel with the necessary qualications
and licenses must perform maintenance on the
boiler. Any repairs must be performed using only
original parts and accessories.
SYMBOLS USED IN THE MANUAL
Advice, suggestion, note
Important communications, signaling
of modes and operations which could
compromise the correct operation
of the boiler and endanger people.

3
COMPONENTS
GIMAX MR/CR (CH/DHW)
1) MAIN HEAT EXCHANGER
2) EXHAUST SAFETY SENSOR
3) CH PROBE/SAFETY PROBE
4) 3WAY GROUP
5) SAFETY VALVE
6) DHW IMMERSION PROBE
7) 3WAY MOTOR
8) CIRCULATOR UNIT
9) DHW PRIORITY DEVICE
10) PRESSURE TRANSMITTER
11) GAS VALVE
12) PLATE HEAT EXCHANGER
13) FAN
14) EXPANSION VASSEL 8 LT
15) RETURN PROBE
16) SIFON
Pict. 1
Pict. 2
14
2
13
15
5
11
8
9
12
6
10
16
4
3
1
DESCRIPTION OF THE BOILER
The range of wall-hung condensing boilers is
completed by the GiMax model. A perfect,
powerful, reliable and ecological boiler, it is
tted with a high efciency condensing heat-
exchanger and is completely made in Italy.
The boiler includes a PCB with microprocessor
to manage the system in such a way as to
always provide maximum efficiency and
minimum waste.
USE AND OPERATION
7

4
IGNITION
2
63 74 8
GIMAX MN/CN (CH ONLY)
1) MAIN HEAT EXCHANGER
2) EXHAUST SAFETY SENSOR
3) CH PROBE/SAFETY PROBE
4) -
5) SAFETY VALVE
6) -
7) -
8) CIRCULATOR UNIT
9) -
10) PRESSURE TRANSMITTER
11) GAS VALVE
12) -
13) FAN
14) EXPANSION VASSEL 8 LT
15) RETURN PROBE
16) SIFON
Pict. 3
14
15
5
10
8
11
16
13
3
1
2
Pict. 4
A
B E F D
C
A= DHW temperature increase
B= DHW temperature decrease
C= CH temperature increase
D= CH temperature decrease
E= Function selection button
F= Reset button

5
IGNITION
Turn on the boiler electric supply by the switch
installed on the power supply line to the boiler.
The LCD display will turn on immediately,
showing the software version loaded on the
PCB microprocessor; the boiler goes into
stand-by and the display show the word OFF.
By pressing the button “E” the boiler goes into
ON mode and the display shows the “-“ sign
and the “TAP” symbol which indicates the
Summer mode.
The boiler is now turned on and ready for
operation.
POWER OFF
Repeatedly press button “E” until the word
“OFF” appears.
Pict. 5
DURING THIS MODE THE BOILER
IS INACTIVE BUT ELECTRICALLY
POWERED.
SEASON SELECTION
The boiler has three operating modes, which
depend from the active functions in response
to the external temperature or the user
requirements.
It is possible to set the SUMMER mode during
which all the functions for domestic heating
are deactivated and only the production
mode of Domestic Hot Water is maintained;
this mode is selected by pressing button “E”
which turns the “TAP” symbol on (Pict. 6).
During the DHW intake the DHW temperature,
the flashing “TAP” symbol and “FLAME”
symbol of burner on are displayed at the
same time.
The WINTER mode is activated by pressing
button “E” which turns the “TAP” and
“RADIATOR” symbols on (Pict.7).In this mode,
the appliance satises both Domestic Hot
Water and Central Heating requirements.
During the DHW intake the DHW temperature,
the flashing “TAP” symbol and “FLAME”
symbol of burner on are displayed at the
same time. During the CH mode operation,
the CH temperature, the ashing “RADIATOR”
symbol and “FLAME” symbol of burner on are
displayed at the same time.
The HEAT ONLY mode is activated by pressing
button “E” which turns the “RADIATOR”
symbol on (Pict.8). In this mode, the appliance
satises Central Heating requirements only.
Pict. 6 Pict. 7 Pict. 8
SUMMER MODE HEAT ONLY MODEWINTER MODE

6
TEMPERATURE REGULATION
DHW temperature and CH temperature can be
adjusted by setting the desired temperature value;
the temperature will be reached, if possible, and
maintained at the set value.
Setting DHW temperature
Press button “A” to increase temperature value
and button “B” to decrease it; the set value and
the ashing “TAP” symbol of DHW are displayed
for 5 seconds, then the previous display mode
is restored and the temperature value is stored.
The minimum DHW temperature which can be set
is 30°C; the maximum 60°C.
Setting CH temperature
Press button “C” to increase temperature value
and button “D” to decrease it; the set value
and the ashing “RADIATOR” symbol of CH are
displayed for 5 seconds, then the previous display
mode is restored and the temperature value is
stored.
For boilers used for high temperature systems,
the temperature range is 50°C-80°C, while for
the ones used for low temperature systems, the
temperature range is 27°C-55°C.
ASK YOUR AREA INSTALLER FOR
INFORMATION ON THE TYPE OF
SYSTEM CONNECTED AND RESPECTIVE
ADJUSTMENTS
A
B E F D
C
Pict. 4

7
INFORMATION MENU
By accessing the “Information Menu” it is possible to
consult the information that is shown on the display
without any possibility of modifying the functional
parameters.
To access the menu pages, press button “E”. The
successful access will be conrmed by the display of
the menu page alternating with the relevant value. To
scroll the pages, use button “A” and “B”.
Pict. 9
B E
A
INFORMATION MENU LIST
n 02 DHW temperature
n 03 Return sensor temperature
n 04 Flue gas probe temperature
n 05 External sensor temperature (if present)
n 10 CH circuit pressure
n 13 Ionization current
n 14 Circulator speed %
n 15 Velocità ventilatore
n 20 Fan speed
n 21 Last fault code
n 22 Second to last fault code
n 26 CH temperature
n 29 Days to ordinary maintenance expiration
n 30 Circulator Feedback

8
ASK YOUR AREA INSTALLER
FOR INFORMATION ON THE
INSTALLATION AND OPERATION
OF A ROOM THERMOSTAT.
OPERATION WITH ROOM THERMOSTAT
Energy savings regulations REQUIRE
the boiler to be connected to a room
thermostat in order to optimally regulate
and maintain the temperature in domestic
environments.
REQUEST INFORMATION ON
INSTALLATION OF THE EXTERNAL
SENSOR AND OPTIMAL REGULATION
OF THE BOILER FROM YOUR AREA
AUTHORISED INSTALLER.
OPERATION WITH EXTERNAL SENSOR
The boiler can be connected to an EXTERNAL
sensor. In this mode, the system can regulate
the central heating circuit temperature
automatically based on the temperature
measured by the suitably located sensor on
the outside of the building.
Adjustments are made automatically to the
central heating circuit temperature using
a pre-loaded mathematical algorithm.
Different “climate curves” can be selected by
modifying the correct parameters, allowing
the boiler to be optimized for a specific
climatic area or season.
It is possible, in any case, to customize the
central heating circuit temperature; by
increasing or decreasing the central heating
circuit temperature, the temperature itself
(temperature offset) adapts to the selected
climate curve.
OPERATION WITH OPEN-THERM TIMER THERMOSTAT
REQUEST INFORMATION ON
INSTALLATION OF THE EXTERNAL
SENSOR AND OPTIMAL
REGULATION OF THE BOILER
FROM YOUR AREA AUTHORISED
INSTALLER.
For optimum and even more economical
management of the domestic premises it is
possible to use the Easycontrol programmable
timer thermostat. Easycontrol allows all main
boiler functions to be managed remotely,
allowing it to be fully managed from a different
room to that where the boiler is installed.
Easycontrol can also be used to schedule
daily and weekly room temperatures and
manage reduced demand periods (holidays,
anti-frost and maintenance modes).
to connect the timer thermostat, and follow
the already specified instructions in the
“INSTALLATION OF ROOM THERMOSTAT”
chapter.
Refer to the instructions for correct installation
and use of the “Ecocrono” thermostat.
To activate the O.T. communication it is
necessary to select the corresponding
parameter P13.

9
ALWAYS LEAVE THE BOILER
POWERED ON AND THE SHUT-OFF
VALVES OPEN, IF THE SYSTEM IS
EXPECTED TO BE SUBJECT TO VERY
COLD TEMPERATURES.
THIS FUNCTION DOES NOT GRANT
TO PREVENT THE HEATING SYSTEM
FROM FREEZING, SINCE IT DEPENDS
ON THE BOILER CONTINUOUS
ELECTRIC POWER AND GAS
SUPPLY.
FOR INFORMATION ABOUT
CONFIGURING THE BOILER TO
PROTECT IT FROM FREEZING, ASK
THE AUTHORIZED AREA INSTALLER.
SPECIAL FUNCTION
- Heating system Anti-frost function (all
models)
The anti-frost function is always active and
prevents the heating system water from freezing.
If the heating circuit water temperature probe
detects a too low water temperature, the
circulating pump starts and the burner ignites
at the minimum power.
The function remains active until the set
temperature is reached, in order to prevent
the heating system water from freezing.
-Instant DHW exchanger pre-heating
This function can be activated exclusively on
models which are prepared and congured
to instantly obtain domestic hot water; this
function allows to keep the DHW exchanger
at a temperature which is close to the set one.
The activation of this function may improve
the boiler’s performance on the DHW request.
FOR INFORMATION ABOUT
CONFIGURING THE DHW
TEMPERATURE, ASK THE
AUTHORIZED AREA INSTALLER.
ACTIVATING THIS FUCTION MAY
CAUSE THE EARLY DETERIORATION
OF THE DHW EXCHANGER AND A
HIGHER GAS CONSUPTION.
FOR INFORMATION ABOUT
THE CORRECT FUNCTION
CONFIGURATION, ASK THE
AUTHORIZED AREA INSTALLER .

10
FAULTS
All the functions supported by the boiler
are managed by a microprocessor system,
which, in addition to allowing them to perform
perfectly with the aim of obtaining the best
possible home comfort, constantly checks
that the functional parameters fall within a
wide range of necessary safety, therefore
that all the devices work perfectly.
If any device malfunctions or conditions
unsuitable for safe operation of the device
are detected, the microprocessor system
detects a fault status, arranges the latter to
operate in reduced mode or even completely
prevents its operation. The microprocessor
system is able to appropriately detect and
report the main fault conditions in order to
be able to intervene and bring the condition
back to normal as quickly as possible. The
faults are reported on the LCD display; the
malfunction condition is detected and
signaled immediately by an intermittent
numerical code preceded by the symbol “E”
(Pict. 10). The anomaly is displayed on any
page of the main menu.
There may be conditions that cause transient
faults. Many of them are detected and cause
a temporary block that is automatically
resolved once the anomalous cause has
ceased; while for some of them it is possible
to perform a manual attempt to restore
operation.
To manually reset the system following an
anomaly condition, press the reset button
“F” (Pict.4).
In case of reset, all the previously set functions
are resumed; in case of persistence of the
fault condition on the display, it is necessary to
request the intervention of technical support.
Pict. 10
IF A FAULT IS NOT SOLVED AFTER 2
MANUAL RESET ATTEMPTS THEN THE
AUTHORISED TECHNICAL ASSISTANCE
CENTRE MUST BE CALLED.
TAMPERING WITH ANY DEVICE MAY
BE DANGEROUS AND ANNULS EVERY
WARRANTY CONDITIONS.

11
*visible only if the relevant devices are present
FAULT CODES TABLE
Code Possible cause Behaviour Possible actions
E01 Ignition failed Boiler locked
Check gas presence Check gas
line pressure Check ignition/
detection electrodes
Check electronic cable
Check igniter
E03
Heating system temperature
sensor fault Boiler locked Replace DHW sensor
E04
Domestic hot water system
temperature sensor fault
DHW supplied in provisional mode
Heating functions Replace CH sensor
E06
High temperature detected by
heating system sensor
Device in stand-by
Normal DHW supply
Wait for automatic unlocking
Check pressure to CH system
E08
Central heating system pressure
too low Boiler locked Check pressure to CH system
E09
Over-temperature safety probe
intervention Boiler locked Perform reset maneuver Contact technical support
E10 Central heating system
pressure too HIGH (> 2.7 bar) Boiler locked Check pump functioning
E11 Pressure transmitter failure Boiler locked
Check integrity of
connection
Replace pressure transmitter
E12 Remote control reset used-up Boiler locked Reset system
Switch off power
E13 SYSTEM error Boiler locked
Reset system
Switch off power
Replace electronic board
E17 Exhaust probe damaged or
Exhaust overtemperature Boiler locked Reset the system or replace the probe
E23* Fault on external temperature
sensor
Resumption of operation without
external sensor
Check position of external
probe
Check communication line
Replace external sensor
E24 Return probe damaged
The boiler continues to operate
with circulator always at
maximum power
Replace the probe
E25
Central heating system
temperature too low freezing risk
Boiler locked If possible reset normal functioning
conditions
E28*
Water cylinder / water heater
probe failure
Boiler locked Replace probe
E30
Fan fault feedback
Boiler locked
Check fan connections
Replace fan
E31
Faulty safety probe
Boiler locked Replace the probe
E60
Circulator PWM error
Circulator always at maximum
power
Check wiring
Replace the circulator
E61
Temporary circulator failure
The circulator works in emergency
mode
Wait for normal conditions to be
restored or replace the circulator
E62
Circulator failure
Boiler locked Replace circulator
E75
Failure communication between
electronic board and display
board
Boiler locked
Reset system
Switch off power
Replace electronic board
E88 Failure OPEN THERM
COMMUNICATION Boiler locked Check connection between boiler and Open Therm
E99
Parameter
conguration error
Boiler locked Check and recongure the
parameters

12
Pict. 11
Pict. 12
Pict. 13
COMBINATION: DOMESTIC HOT WATER + CENTRAL HEATING
CENTRAL HEATING ONLY
7
6
8
9
11
10
2
3
1
CENTRAL
HEATING
RETURN
IMAIN
WATER
INTAKE
DHW
OUTLET
CENTRAL
HEATING
FLOW
GAS
CONDENSING
EXHAUST
4
5
7
6
11
10
2
3
1
GAS
4
CENTRAL
HEATING
RETURN
IMAIN
WATER
INTAKE
CENTRAL
HEATING
FLOW
CONDENSING
EXHAUST
AB
BA
1
2
3
BOILER FLOW
HOT
WATER
OUTLET
COLD
WATER
INTAKE
BOILER
RETURN IN
INSTALLATION
1) Primary heat exchanger
2) Burner
3) Fun
4) Gas valve
5) Three-way valve
6) Safety valve
7) Filling loop cock
8) Hot water priority turbine
9) Secondary heat exchanger
10) Circulator unit
11) Expansion tank
1) Primary heat exchanger
2) Burner
3) Fun
4) Gas valve
5) -
6) Safety valve
7) Filling loop cock
8) -
9) -
10) Circulator unit
11) Expansion tank
1) Central heating circuit
2) Three-way valve
3) Boiler
OPERATION DIAGRAM
THREE-WAY BOILER OPERATION DIAGRAM
OPERATION DIAGRAM

13
ELECTRICAL WIRING DIAGRAM
COMBINATION: DOMESTIC HOT WATER + CENTRAL HEATING
Pict. 14
CENTRAL HEATING ONLY
Pict. 15
T.A. /O.T
E.P.
S.P.
FL.
F.
N.
N.
E.A.
X1
F1
X6
X5
X4
X10
X3
X12
X9
11
1
11111
X2
Red +5VDC
Green -GND
Orange SIGN
Blu
Blu
Brown
Y/G
F.
N.
F.
V.G.
N.
F.
N.
F.
B
FAN
P.
P.P.
Input/Brown
0VDC/Blu
1
2
3
P.F.
RED - PWM INPUT
BLACK - GND
GREEN -HALL SENSOR
BLU + 24 VDC
F.P.
R.P.
3
1
2
42 - 4 / H.P.
1 - 3 / S.T.
2
3
1
4
HALL/Black
X3A
1
1
Lista connessioni GIMAX PLUS ECO
3.W.M. Valvola Tre Vie FAN Aspiratore fumi N. Neutro S.P. Sonda Sanitario
B. Terra Caldaia FL. Flussostato P. Circolatore S.T. Sonda Sicurezza
E.A. Elettrodo Accensione F.P Sonda Fumi P.F. PWM Ventilatore P.S. Pressostato Acqua
E.P. Sonda Esterna H.P. Sonda Riscaldamento P.P. PWM Circolatore T.A./O.T Termostato Ambiente/Open Therm
F. Fase M.V.G. Modulatore Vavola Gas R.P. Sensore Ritorno
P.S.
N.O.
N.C.
3 W.M.
COM.
V.G. Valvola Gas
1) Central heating circuit
2) Three-way valve
3) Boiler
T.A. /O.T
E.P.
F.
N.
E.A.
X1
F1
X6
X5
X4
X10
X3
X12
X9
11
1
11111
X2
N.
F.
B
P.F.
RED - PWM INPUT
BLACK - GND
GREEN -HALL SENSOR
BLU + 24 VDC
3
1
2
42 - 4 / H.P.
1 - 3 / S.T.
2
3
1
4
X3A
1
B.P.
F.P.
List of connession GIMAX MR/MN
3.W.M. 3way valve
FAN Fan
N. Neutral S.P. DHW Probe
B.P. Sonda Boiler
B. Boiler Earth
FL. Flow Switch
P. Circulating Pump S.T. Safety Probe
E.A. Ignition Electrode F.P Exhaust Probe
P.F. Fan PWM
E.P. Outdoor probe H.P. CH Probe
P.P. Pump PWM T.A./O.T Room Thermostat/ Open-Therm
F. Phase
R.P. Return Probe
V.G. Gas Valve
T.B.
T.B. Storage Tank Thermostat
R.P.
P.S.
N.
Blu
Blu
Brown
Y/G
F.
N.
F.
V.G.
N.
F.
FAN
P.
N.O.
N.C.
3 W.M.
COM.
Input/Brown
0VDC/Blu
1
2
3HALL/Black
P.P.
P.S. Pressure Transmitter

14
Pict. 16
GRAPHS FOR THE HEAD AVAILABLE TO THE SYSTEM
COMING SOON
INSTALLATION
Use:
The boiler has been constructed according
to current technical standards and the most
stringent safety rules. Despite this, improper
use may endanger persons and property as
well as damaging the boiler itself.
This boiler has been designed as a thermal
generator for closed-loop central heating
systems and for the production of domestic
hot water.
This boiler is only for heating water to a
temperature below that of boiling point at
atmospheric temperature.
Any use different from those outlined herein is
to be considered improper. The manufacturer/
supplier declines any responsibility for
damage or injury caused by improper use.
Use of the boiler according to its design also
means respecting the instructions given in
the operation and maintenance manuals
and observing the general inspection and
maintenance conditions.
General requirements
• Installation must only be performed by
qualied and licensed personnel. They also
assume responsibility for correct installation,
adjustment and commissioning.
Adjustment, maintenance and repair of the
boiler must only be performed by qualied
and authorised personnel.
• Do not install the boiler in environments
containing dust or strong vapours.
The presence of substances such as uorine,
chlorine, sulphur etc. (e.g. vapours from
sprays, solvents or detergents, paints,
adhesives or fuels) may cause the boiler’s
components or combustion gas evacuation
system to corrode and become damaged.
Avoid installing the boiler directly in
commercial/industrial premises (e.g. hair
salons, painting/carpentry workshops,
cleaning companies etc.).
• Install the device respecting the minimum
distances and spaces in Pict. 18 (also when
installing inside an enclosure).
• Mount the boiler on a solid wall.
• Ensure that there are no depressions which
could cause the boiler to stand out from the
wall.
• Ensure you do not drill into tracked cables
or piping when drilling.

15
Pict. 17
Fig. 18
FASTENING THE BOILER TO THE WALL
Attach the cardboard template giving the
connection and fastening schemes to the
wall, paying attention to the boiler dimensions
and necessary clearances. (Pict. 19)
• Use a suitable bit to drill the holes indicated
by the two wall plug symbols on the template.
• Remove the template; insert the two wall
plugs in the previously prepared holes, then
hang the boiler, inserting the hooks of the
plugs in the specic holes.
Fasten the template so that its axis
coincides perfectly with that of the
boiler.
750
MURO / WALL
* =DIMENSIONE VALIDA SOLO CON KIT DEL COSTRUTTORE / DIMENSION VALID WITH THE MANUFACTURED KIT ONLY
65 107
63
68
3/4" 1/2" 3/4"
MANDATA RISCALD.
C.H. OUTPUT
INGRESSO GAS
GAS INLET
ACQUA CALDA SANITARIA
D.H.W.
6365
107
37*
1/2" 3/4"
175
RITORNO RISCALD.
C.H. INPUT
INGRESSO ACQUA SAN.
D.H.W. INLET
DIMA
TEMPLATE
18
470
230
82,5 24DS / 24BT
28-32DS / 35CN
82
340
24DS / 24BT
28-32DS / 35CN
65* 67* 65*67*

16
Fig. 19
LAYOUT OF CONNECTIONS
PLUMBING THE BOILER
Connect the water and central heating pipes to
the boiler, respecting the positions and distances
indicated (Pict. 20); take particular care when
connecting pipes to ensure they are not placed
under pressure in order to minimise the danger of
future leaks. Use appropriate tools and procedures
for tightening.
Flush thoroughly before connecting
the pipes to ensure that any impurities
present in the piping and radiators
are completely removed.
Connect the safety valve outlet so
that its operation would not cause
any damage to persons or property
• Use piping of not less than 1/2”
diameter
• Ensure that the line is always
at atmospheric pressure by using
suitable traps (do not connect pipes
directly to the valve outlet)
• Connect the safety valve outlet line
to the household grey water drainage
system
• Apply suitable protection to the
drainage line – the water carried in it
may be at high temperatures
• THE MANUFACTURER ASSUMES
NO RESPONSIBILITY FOR DAMAGE
CAUSED TO PERSONS OR PROPERTY
DUE TO OPERATION OF THE SAFETY
VALVE DO NOT USE THE PLUMBING
PIPEWORK CONNECTIONS AS EARTH
POINTS FOR ELECTRICAL EQUIPMENT.
WARNING!!!
PROTECT THE PRIMARY HEAT
EXCHANGER BY THE USE OF THE
CORROSION INHIBITOR FLUID
EXCLUSIVELY SUPPLIED BY THE
MANUFACTURER. OTHERWISE THE HEAT
EXCHANGER WARRANTY SHALL
DECAY.
• Idraterm p.100 In 1% sol. For high
temperature systems
• Idraterm p.140 In 1% sol. For low
temperature systems
AIR INTAKEEXAUST
Only Eco MR Only Eco MN

17
CONNECTING FILLING TAP FOR CENTRAL HEATING ONLY BOILERS
In order to ll the system, it is sufcient to
connect the supplied ball valve to the 1/2”
DHW intake and connect this to a water pipe.
Pict. 20
FILLING THE SYSTEM
CONNECTING CONDENSATE LINE
When all of the boiler connections have
been plumbed in, it is possible to proceed
to ll the central heating circuit. Perform the
operation slowly to help all air bleed out of
the system. When lling, check all the internal
and external parts of the system to make sure
they are perfectly tight.
• Open the bleed valves on the radiators.
• Gradually open the lling loop cock Pict. 21,
ensuring that any automatic air bleed valves
installed on the system are working correctly.
• Close the radiator bleed valves as soon as
water starts to come out.
• Check on the boiler pressure gauge that
a pressure of between 1.3 and 1.6 bar has
been reached.
• Close the lling loop.
Perform the lling and topping
up of the system with the boiler
completely off and all parts at
ambient temperature.
Always close the filling loop
cock once you have nished the
operation.
Filling ball valve
Filling loop cock
Pict. 21
The GiMax boiler is already fitted with a
condensate trap to avoid the combustion
products entering the environment it is
installed in.
The boiler’s connection to the condensate
line must be inspectable and must drain into
the household waste-water drainage system
with a minimum fall specied by applicable
regulations. There must be no points where
standing water can form and no narrowing
which could impede the ow.
An open type connection must be used
to ensure that any formation of ice in the
drainage system does not impede the
condensate flow. Pict. 23 shows how to
connect the trap to the household drainage
system.

18
Mains gas intake
CONNECTION TO THE MAINS GAS SUPPLY
Check that all devices necessary
for creating and limiting the
maximum permissible pressure
of the relative gas are installed
in the system before opening the
boiler’s gas connection.
Do not use the gas supply
pipework connections as earth
points for electrical equipment.
Always install a gas shut-off valve
before the device. This must have
a YELLOW valve handle and must
be placed in a position which
allows full access to it.
Before connecting the boiler to the mains gas,
check that it is designed to function with the
available type of gas. Thoroughly flush all the
gas pipes to remove any residues which could
compromise correct operation of the boiler.
The gas supply must be connected to the
boiler intake (Pict. 23), following all applicable
regulations. Rigid metal piping or continuous-wall
stainless-steel hose must be used and a shut-off
valve must be connected before the boiler.
Check that the ow rate from the line from the
gas meter is sufcient to support the simultaneous
use of all equipment connected to it. Check
that there is no signicant drop in pressure along
the distribution line from the gas meter; pipes of
sufcient diameter must therefore be used to satisfy
this requirement.
Pict. 23
Fig. 22
Siphon
Condensing exhaust
Condense collecting pipe
Clean water draining
The installer will be responsible for providing
a condensation neutralization system if
necessary
A check and possible cleaning of the siphon
and the condensation drainage system is
recommended at least once a year.