Page 1
Servicing Instructions
Type C Boilers
G.C.N: 41-116-01
47-116-08
47-116-09
47-116-13
LEA VE THESE INSTRUCTIONS
ADJACENT T O THE GAS METER
Page 2
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B005
Page No.
1. SERVICING INSTRUCTIONS
1.1 Replacement of Parts 3
1.2 To Gain General Access
- Removing the Front Panel 3
- Removing the Bottom Cover 4
- Removing the Side Panels 4
1.3 Access to the Combustion Chamber
- Removing the Sealed Combustion Chamber 5
- Removing the Burner and Injectors 5
- Removing the Electrodes 6
- Removing the Main Heat Exchanger 7
- Removing the Air Pressure Switch 7
- Removing the Venturi Device 8
- Removing the Fan 8
1.4 Servicing and Removal of the Gas Valve
- Setting Gas Pressure 10
- Removing the Spark Generator (SIT Sigma Gas Valve) 12
- Removing the Spark Generator (SIT Tandem Gas Valve) 13
- Removing the Gas Valve 14
1.5 Access to the Hydraulic Circuit
- Removing the D.H.W. (Secondary) Exchanger 14
- Removing the Safety Valve 15
- Removing the Automatic Air Vent 15
- Removing the Main Flow Circuit Switch 15
- Removing the Pump 16
- Removing the Pressure Gauge 16
- Removing the Expansion Vessel 17
- Removing the Overheat Thermostat 17
- Removing the Heating Temperature Sensor (N.T.C.) 17
- Removing the D.H.W.Temperature Sensor (N.T.C.) 18
- Removing the Diverter Valve (Genus 27 RFFI Only) 18
1.6 Access to the Control System
- Checking the Fuses 19
- Removing the Time Clock 19
- Removing the P.C.B.s 20
2. FAULT FINDING
2.1 Fault Finding Guide (Flow-chart) 21
2.2 Fault Finding Using the Total Check System 26
3. ELECTRICAL DIAGRAMS
3.1 Electrical Connection 27
3.2 Functional Flow Connection 29
4. SHORT SPARE PARTS LIST
30
TABLE OF CONTENTS
Page 3
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1. SERVICING INSTRUCTIONS
The life of individual components vary and they will need servicing or
replacing as and when faults develop.
The fault finding sequence chart in chapter 2 will help to locate which
component is the cause of any malfunction, and instructions for removal,
inspection and replacement of the individual parts are given in the following
pages.
1.1 Replacement of Parts
1.2 To Gain General Access
All testing and maintenance operations on the boiler require the control panel
to be lowered.This will also require the removal of the casing.
To dismantle the front part of the casing, proceed as follows:
1. Loosen the two screws “A”located on the bottom par t of the boiler until
the first thread on the screws appears
(Fig. 1.1)
;
2. Lift the front panel up until it stops with a click and remove the front
panel from the rest of the casing
(Fig. 1.2)
;
4. Unhook the two cords from the locating slots
(Fig. 1.3)
.
A
Fig. 1.2
Fig. 1.3
Fig. 1.1
To ensure efficient safe operation, it is recommended that the boiler is
serviced annually by a competent person.
Before starting any servicing work, ensure both the gas and electrical
supplies to the boiler are isolated and the boiler is cool.
Before and after servicing, a combustion analysis should be made via the flue
sampling point (please refer to the Installation Manual for further details).
After servicing, preliminary electr ical system checks must be carried out to
ensure electrical safety (i.e. polar ity, earth continuity, resistance to earth and
short circuit).
Page 4
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B005
Removing the bottom cover
1.
Remove the screws “B”
Removing the side panels
1.
Remove the screws “C”;
2.
Pull the panel away from the boiler,
then lift the panel up and away from
the boiler.
Fig. 1.4
B
C
C
C
Fig. 1.5
Page 5
1.
Remove the side panels of sealed chamber
(fig. 1.8)
;
2.
Remove the screws “F” of the burner
(see fig. 1.9)
;
3.
Remove the burner
(see fig. 1.10)
;
4.
Remove the injectors using a No. 7 socket spanner;
5.
Replace in reverse order.
Removing the burner and the
injectors
5
B005
Removing the sealed chamber
frontal cover
1.3
Access to the Combustion Chamber
Remove the screws “D”
Remove the screws “E”
Removing the combustion cover
E
E
E
E
E
E
E
Fig. 1.6
Fig. 1.7
D
D
D
D
Fig. 1.8
Fig. 1.9
Fig. 1.10
F
push
push
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6
B005
Removing the electrodes 1.
Remove rubber gasket “G”
(see fig. 1.11)
;
2.
Disconnect ignition leads by pulling downward
(see fig. 1.12)
;
3.
To remove the flame sensor disconnect the cable at its only connection
point close to the P.C.B.
(see fig. 1.13)
;
5.
Remove screw “H” using a Philips No. 2 star tip screwdriver
(see fig. 1.14)
;
6.
Slide the electrode gently downward
(see fig. 1.15).
To replace, repeat the steps in reverse order , paying particular attention to the
following:
a
-Centre the electrode in the positioning hole carefully, otherwise the
electrode may break;
b
-Check that the cables have been connected correctly;
c
-Check that the rubber gasket covers the cable/electrode connection
point completely.
Fig. 1.11
G
Fig. 1.12
Fig. 1.13
Fig. 1.14
Fig. 1.15
H
Page 7
1.
Disconnect the electrical connections “K” and silicone pipes “L” from their
connection points
(see fig. 1.18)
;
2.
Remove screws “J” on the top of the sealed chamber
(see fig. 1.19)
;
Use a No.2 star tip screwdriver to remove the switch from the plate.
Fig. 1.19
Fig. 1.18
7
B005
1.
Drain the boiler of water;
2.
Release the two connection nuts “I” connecting the exchanger to the flow
and return pipes
(see fig. 1.16)
;
3.
Pull it straight out
(see fig. 1.17).
Removing the main heat
exchanger
Removing the air pressure switch
Fig. 1.16
I
Fig. 1.17
L
L
K
J
J
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8
B005
1.
Disconnect the silicone pipes “M” and remove the screw “N”
(see fig. 1.20)
;
2.
Extract the venturi
(see fig. 1.21)
.
Removing the venturi device
1.
Disconnect electrical connections and remove screws
“O” using a No.2 star tipped screwdriver
(see fig.1.22)
;
2.
Pull fan to the right and forward and remo ve
(see fig.1.23
);
3.
Remove fan from mounting plate;
4.
Remove screws “P”
(see fig.1.24)
.
Removing the fan
M
N
Fig. 1.20
Fig. 1.21
Fig. 1.22
Fig. 1.23 Fig. 1.24
O
O
P
P
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1.4
Servicing and Removal of the Gas Valve
1
2
3
4
A
B
C
E
F
D
SIT
TANDEM
SIT
SIGMA
1
2
3
4
A
B
C
E
F
D
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B005
Setting the minimum and the maximum power of the boiler
1. Check that the supply pressure to the gas valve is a minimum of 20 mbar
for natural gas.
2. To do this, remove the screw “A”.
Fit the pipe of the pressure gauge to the pressure connection of the gas
valve “B”.
When you have completed this operation, replace the screw “A” securely
into its housing to seal off the gas.
3. To check the pressure supplied by the gas valve to the burner, remove the
screw “C”. Fit the pipe of the pressure gauge to the pressure outlet of the
gas valve “D”.
Disconnect the compensation pipe either from the gas valve or from the
sealed chamber.
4. Set the On/Off button to position < I > and the "summer/winter" switch to
the winter position.
To set the maximum power, turn on the hot water tap and allow the hot
water tap to run at a rate of about 8 litres/minute so that the main burner
lights.
Adjust nut “E” on the modureg to set the gas pressure (displayed on the
pressure gauge) corresponding to the maximum power (see table “A”page 11).
5. T o set the minim um pow er, disconnect a supply terminal from the modureg
and adjust screw “F”.
Turn the screw clockwise to increase the pressure and counter-clockwise to decrease the pressure (displayed on the
pressure gauge) corresponding to the minimum power (see table “A” page
11).
6. When you have completed the above operations, turn off the
hot water tap, re-connect the supply terminal to the modureg
on the gas valve and replace the cap on the screw of the
modureg.
Setting the maximum heating circuit power
7. To set the maximum heating circuit power, place the
On/Off button to position < I > and the "summer/winter" switch to winter
position.
Tur n the knob of the heating ther mostat clockwise to maximum;
8. Remove the left hand inspection panel of the P.C.B. and fit a small
cross-head screwdriver in to the right hand potentiometer.Tur n clockwise
to increase the pressure or counter-clockwise to reduce the pressure.
Adjust the setting to the required heating pressure value (displayed on the
pressure gauge), as indicated in the diagrams shown in page 11.
9. Turn off the boiler by placing the main switch to the "Off" position.
Setting pressure for soft ignition.
Disconnect the detection electrode connection from the P.C.B. (see fig.
1.13).
Start the boiler and during the ignition sequence adjust the centre
potentiometer until the gas pressure reads the required gas pressure as
per the table below.
Once the gas pressure is set turn off the boiler and reconnect the
connection to the P.C.B.
NB.:It may be necessary to reset the flame failure reset a number of times
during this operation.
Setting gas pressures
Recommended pressure for
slow ignition
NATURAL GAS (G20) BUTANE GAS (G30) PROPANE GAS (G31)
5 mbar - 1.95 in w.g.
18 mbar - 7.0 in w.g. 19 mbar - 7.4 in w.g.
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Regulating the heating power for
natural gas (G20)
Regulating the heating power for
butane gas (G30)
Regulating the heating power for
propane gas (G31)
T ABLE “A”
model 23
model 27
model 23
model 27
40
38
36
34
model 23
model 27
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B005
10. Remove the pipe from the pressure gauge and connect screw “C” to the
pressure outlet in order to seal off the gas.
11.Carefully check the pressure outlets for gas leaks (valve inlet
and outlet).
IMPORTANT!
Whenever you disassemble and reassemble the gas connections, always
check for leaks using a soap and water solution.
Setting the anti-cycling device
This appliance is equipped with a potentiometer which delays the ignition of
the heating control and is situated on the P.C.B.(see the electrical diagrams).
By adjusting the potentiometer, it is possible to change the time interval
between the burner shutting down and its next ignition.
It is preset at 1 minute and can be adjusted from 0 to 2 minutes.
Use this control in particular situations where continuous shutting down and
ignition of the main burner occurs.
Anti-cycling
Device
Soft-light
Adjustment
Max Heating
Adjustment
Removing the spark generator (SIT Sigma gas valve)
1.
Disconnect ignition leads “Q” by pulling upwards
(see fig. 1.25)
;
2.
Remove the screws “R”
(see fig. 1.26)
with a Pozidrive
No.2 star tip screwdriver;
3.
Remove the spark generator.
Fig. 1.25
Fig. 1.26 Fig. 1.27
Q
R
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Removing the spark generator (SIT Tandem gas
valve)
1.
Disconnect ignition leads “Q1” by pulling upwards
(see fig. 1.28)
;
2.
Remove the screws “R1”
(see fig.1.29)
with a Pozidrive
No.2 star tip screwdriver;
3.
Remove the spark generator.
Fig. 1.28
Fig. 1.29 Fig. 1.30
Q1
R1
R1
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1.5
Access to Hydraulic Circuits
Fig. 1.35
U
Removing the gas valve
1.
Disconnect all the cables from the solenoid and
modureg;
2.
Remove the spark generator;
3.
Release the top nut “S” using a 30 mm open ended
spanner
(see fig. 1.31)
;
4.
Remove the screws “T” from the bottom of the gas
valve pipe
(see fig. 1.32)
.
Attention!!
The gas valve is connected with the two pipes
(as shown) with an O-ring connection.
U
Important!
Before any component is removed, the boiler
must be drained of all water.
Removing the D.H.W. (secondar y)
exchanger
1.
Remove the screw “U”
(see fig. 1.35)
;
2.
Push the exchanger towards the rear of the
boiler, lift upwards and remove out of the
front of the boiler;
3.
Before replacing the exchanger ensure that
the O-rings are in good condition and
replace if necessary.
Fig. 1.31
Fig. 1.32
Fig. 1.33
S
T
T
Fig. 1.34
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Removing the safety valve
1.
Loosen nut “V”
(see fig. 1.36);
2.
Remove the valve.
Removing the automatic air vent
1.
Unscrew valve “W”
(see fig. 1.37)
.
Removing the main circuit flow
switch
1.
Remove the cable of the main circuit flow switch “Y”;
2.
Remove the screws “Y1”
(see fig. 1.38)
;
3.
Remove the main circuit flow switch.
Fig. 1.36
Fig. 1.37
Fig. 1.38
V
W
Y
Y1
Y1
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Removing the pump
1.
Unscrew “Z” and remove the electrical connection
(see fig. 1.39)
;
2.
Release the nuts “A1” and remove the pump
(see fig. 1.40)
.
Removing the pressure gauge
1.
Remove the pressure gauge cover by pulling
(see fig. 1.41)
;
2.
Release coupling “A2” using a 14 mm open ended
spanner
(see fig. 1.42)
;
3.
Push the pressure gauge through the control panel
from the rear
(see fig. 1.43)
.
A1
A1
Z
A2
Fig. 1.39
Fig. 1.40
Fig. 1.41
Fig. 1.42
Fig. 1.43
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Removing the expansion vessel
1.
Remove nut “A3” away from the expansion vessel
(see fig. 1.44)
;
2.
Remove nut “A4”
(see fig. 1.45)
;
3.
Remove expansion vessel
(see fig. 1.46)
.
Removing the overheat thermostat
1.
Remove the electrical connector by the overheat
thermostat
(see fig. 1.47
);
2.
Pull off the thermostat connections. Then remove the
thermostat from the pipe by releasing it’s securing clip.
Removing the heating temperature sensor (N.T.C.)
1.
Remove the electrical connector by pulling off the
thermostat connections and unscrewing the sensor
probe with a 14 mm open ended spanner
(see fig.
1.48)
.
A3
A4
Fig. 1.44
Fig. 1.45
Fig. 1.47
Fig. 1.48
Fig. 1.46
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Removing the D.H.W. temperature sensor (N.T.C.)
1.
Remove the electrical connector by pulling off the
thermostat connection and unscrew the sensor probe
with a 14 mm open ended spanner
(see fig. 1.49)
.
Fig. 1.49
Removing the diverter valve (Genus 27 RFFI only)
1.
Remove the circlip and pull the diverter valv e to the left.
Fig. 1.50
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Checking fuse
1.
Remove the right hand inspection cover
(see fig. 1.51)
;
2.
Remove fuse
(see fig. 1.52)
.
1.6
Access to the Control System
Removing the time clock
1.
Remove left hand inspection cover
(see fig. 1.53)
;
2.
Remove electrical connection “A5”of the clock
(see fig.
1.54)
;
3.
Unscrew “A6” and remove
(see fig. 1.55)
.
Fig. 1.51
Fig. 1.52
Fig. 1.53
Fig. 1.49 Fig. 1.50
A5
A5
A6
A6
N.B.
It is possible to by-pass the time clock in the event of
failure by simply unplugging the electrical connection from
the P.C.B.
(see fig. 1.54
). This will revert control of the
central heating to the room stat connection on the reverse
of the control panel.
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Removing the P.C.B.s
1.
Isolate electricity;
2.
Remove the front cover of the boiler;
3.
Remove both left and right inspection panels;
4.
Remove the pressure gauge cover;
5.
Remove the mounting screws “A7’
(see fig. 1.51)
;
6.
Disconnect the connection cable”A8”
(see fig. 1.52)
;
7.
To remove the 24V P.C.B.: remove the electrical plug
connectors and screws “A9”
(see fig. 1.53)
;
8.
To remove the 240V P.C.B.: remove the electrical plug
connectors and screws “A10”
(see fig. 1.54)
;
9.
Replace either P.C.B.in reverse order.
Fig. 1.51
Fig. 1.52
Fig. 1.53
Fig. 1.54
A7
A7
A7
A7
A8
A8
A9
A9
A10
A10
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2. FAULT FINDING
It is possible to detect and correct any defect by using the standard fault
finding diagrams described in this chapter.
2.1
Fault Finding Guide
(Flow-chart)
Prel imin ary C heck s
Make sure that:
1) There is sufficient
water in the system
2) The gas is t urned o n
3) The electricity to the
boiler is on
Press t he
On / Off Button
HAS
THE LIGHT fO R
THE PO WE R S UPPLY
COME ON?
YES
NO
1) Check the fuses
2) Check the pow er
supply cord, plug and
outlet
3) Check/replace the power
supply P.C.B.
NO
SUMMER
IS HOT
WATER BEING
DEMA NDED?
NO
FOR B OILERS
EQ UIPPE D WI TH A N
ELECTRONICANT-FREEZE
SYSTEM:HASTHE SAFETYBEEN
TRI GGERED TO ACT IVAT E
THEDEVICE?
(T sensor <5˚C)
SETTING
FOR THE O PERATI NG
MODE
FUME DISCHARGE TEST
YES
YES
YES
YES
WINTER
IS HOT
YES
WATER BEING
DEMANDED?
NO
DO THE
TIME CLOCK
AND/ORROOM
THERMOSTATNEED
TO BE ACTIVATED
NO
FOR B OILERS
EQ UIPPE D WI TH A N
ELECTRONICANT-FREEZE
SYSTEM:HASTHE SAFETYBEEN
TRI GGERED TO ACT IVAT E
THEDEVICE?
(T sensor <5˚C)
NO
A
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A
DOES THE
CIRCULA TION PUMP
COME ON?
YES
NO
1) Check for air in the
system
2) Check the pressure switch
for activating pump
3)Check/replace pressure
gauge and refill the
the system properly
1) Turn the boiler off
and then back on
again (safety reset)
YES
DOES THE
INSUFFICIENT WATER
INDICATOR LIGHTCOME
ON?(within
40 sec.)
NO
B
POWER TO
THE PUMP?
YES
1) Check to see if pu mp is
stu ck
2)Replacecirculation pump
NO
1) Check
wiring
2) Check/repl ace
wire to P.C.B.
3) Replace
power supply
P.C.B.
4) Replace control
P.C.B.
5) Check microswitch when hot
water is requested.
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B
DOES THE FAN
COME ON?
YES
C
NO
BOILER
SHUTDOWN?
NO
PUMP
SAFETY DEVICE
ACTIVATED?
NO
INTERNAL
SAFETY DEVICE
FOR PCB
ACTIVATED?
NO
IS THERE POWER
TO THE FAN?
YES
YES
YES
YES
NO
1) Reset the boiler
1) Check/replace differential
pressu re sw itch for pu mp
2) Check/replace wiring
3) Check/replace P.C.B. wire
4) Check/rep lace power
supply P.C.B.
5) Check/replace control
P.C.B.
1)
Check/replace air
pressure switch/wiring
2) Check whether reset
button isstuck
3)
Check/replace flame
detection electrode
1)
Check/replace wiring
Check/replace
2)
3) Check/replace power
supplyP.C.B.
4)
Check/replace control
P.C.B.
Check/replace air
5)
pressu re switch
P.C.B. wire
1)Replace fan
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C
IS
THE AIR PRESSURE
SWITCH ACTIVATED?
YES
ARE THE
FUMES DISCHARGED
CORRECTLY?
YES
DOES THE
BURNER LIGHT?
YES
NO
NO
NO
1) Check flue discharge
2) Check venturi & small pipes
3) Check wire for air press.switch
4) Check/replace air press. switch
5) Check/replace P.C.B. wire
6) Check/replace power P.C.B.
7) Check/replace control P.C.B.
1)Check/replace ignition electrodes
2) Check wiring
3) Check spark generator
4) Check small wire
5) Check power supply P.C.B.
6)Check control P.C.B.
1)Check supply of gas to gas
valve
2) Check power supply P.C.B.
3)Check control P.C.B.
4)Check functionality of the gas
valve
SAFETY
SHUTDOWNOF THE
BOILER ACTIVATED?
NO
D
YES
NO
1) Check whether flame
detection electrodeis
postioned in the flame
2) Check the electrode
3)Check the power P.C.B.
4)Check the control P.C.B.
WAS THE
RESET SWITCH
PRESSED?
YES
Shutdown L.E.D. off
Restart of thefan
Page 25
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B005
D
THERE STILL A
IS
PROBLEM?
YES
NO
FUNCTIONS
NORMALLY
LISTOF MALFUNCTIONS
Deliveryof hot waterfor domestic use:
Deliveryof hot waterfor domestic use:
1
when thetap isturned on, theburner goes out.
when thetap isturned on, theburner goes out.
2
Deliveryof hot waterfor domestic use:
Deliveryof hot waterfor domestic use:
the radiatoresareheatedin summermode.
the radiatoresareheatedin summermode.
Deliveryof hot waterfor domestic use:
Deliveryof hot waterfor domestic use:
3
water temperatureis not satisfactory.
water temperatureis not satisfactory.
4
Deliveryof hot waterfor domestic use:
Deliveryof hot waterfor domestic use:
noisyoperation.
noisyoperation.
POSSIBLE CAUSES
- Airin thesecondaryexchanger
- Airin thesecondaryexchanger
- Hot water pressure switch is defective
- Hot water pressure switch is defective
- 3-way valve is defective
- 3-way valve is defective
- 3-way valve is defective
- 3-way valve is defective
- Check sensors for domestic and heating water
- Check sensors for domestic and heating water
- Checkgas settingsand regulation
- Checkgas settingsand regulation
- Checkwater flow rate
- Checkwater flow rate
- Check secondary exchanger
- Check secondary exchanger
- Primary exchanger is defective
- Primary exchanger is defective
- Low water pressure in heating system
- Low water pressure in heating system
- Checkgas settingsand regulation
- Checkgas settingsand regulation
- Checkntc sensor fordomestic hot water
- Checkntc sensor fordomestic hot water
5
Drop/increasein pressure in primary circuit.
Drop/increasein pressure in primary circuit.
6
Repeatedshutdowns.
Repeatedshutdowns.
7
Safety thermostat istriggered repeatedly.
Safety thermostat istriggered repeatedly.
8
When thecold watertap is turned off, the
When thecold watertap is turned off, the
boiler comeson.
boiler comeson.
9
Temperature of radiators not satisfactory.
Temperature of radiators not satisfactory.
- Check for leaks in heating circuit
- Check for leaks in heating circuit
- Defective water supply inlet valve
- Defective water supply inlet valve
- Secondary exchanger is defective
- Secondary exchanger is defective
- Expansion vessel is empty
- Expansion vessel is empty
- Detection electrodes are defective
- Detection electrodes are defective
- Checkgas settingsand regulation
- Checkgas settingsand regulation
- Check electrical circuit for flame detection
- Check electrical circuit for flame detection
- Faulty(contacts)N.T.C. sensors-heating/hot water
- Faulty(contacts)N.T.C. sensors-heating/hotwater
- Defective (poorly calibrated) safety thermostat
- Defective (poorly calibrated) safety thermostat
- Presence of air in the primary water circuit
- Presence of air in the primary water circuit
- Drop in pressure in the water mains,resulting
- Drop in pressure in the water mains,resulting
in water hammering
in water hammering
- Check N.T.C. sensor for heating
- Check N.T.C. sensor for heating
- Check by-pass
- Check by-pass
- Checkgas settingsand regulation
- Checkgas settingsand regulation
Page 26
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Signalling
Boiler Off
Auto diagnostic state
Spark ignition state
Boiler functioning normally
Lockout
Boiler thermostat satisfied
Room thermostat/clock no demand or
selector in summer setting
Malfunction
Faulty ventilation system
Air pressure switch stuck in N.O. position
Faulty reset switch
Faulty main circuit flow switch
Faulty flame detection
Faulty overheat thermostat
Faulty exhaust fumes sensor
Faulty heating sensor (N.T.C.)
Faulty D.H.W. sensor (N.T.C.)
A
b
C
d
E
F
G
I
m
1
2
3
4
5
6
2.2
Fault Finding Using the Total Check System
Pump fed
Main flow switch closed
Air pressure switch N.O.
Flame detected
Water at required temperature
Room thermostat/clock no demand or
selector in summer setting
Auto diagnostics faulty
Heating temperature control
D.H.W. temperature control
Heating circuit efficiency control
D.H.W. exchanger efficiency control
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3. ELECTRIC DIAGRAMS
Legend:
AT = High Voltage P.C.B.
BT = Low Voltage P.C.B.
A = Remote Connector Kit
B = Flame Failure L.E.D.
C = Insufficient Water Pressure L.E.D.
D = Water Temperature Indicator L.E.D.s
E = Overheat Thermostat Warning L.E.D.
F = System Reset Button
G = Selector Knob for Operating Mode
H = Domestic Hot Water Temp. Adjustment
I = Central Heating Temp. Adjustment
J = Wire Connector for Room Thermostat
K = Connector for Total Check System
L = Selector for Local/Remote Control
M = Anti-cycling Device Adjustment for Heating
N = Soft-light Adjustment
O = Max Heating Temperature Adjustment
P = Time Clock Connection
Q = On/Off L.E.D.
R = On/Off Switch
S = Interface Wire for P.C.B.s
T = Relay Motorised Valve
U = Ignitor Relay
V = Gas Valve Relay
W = Fan Relay
X = Circulation Pump Relay
Y = Selector TCS2
Z = Link for Continuous Pump Run
Aa = Adaptor (British Gas use only)
A01= Air Pressure Switch
A02= Fan
A03= Gas Valve
A04= Ignitor
A05= Motorised Valv e
A06= Circulation Pump
A07= Flame Detector
A08= Earth T erminal
A09= Flame Detection Circuit
A10= Flame Indicator L.E.D.
A11= Transformer
A12= Filter
B01= Over Heat Thermostat
B02= External Thermostat
B03= Gas Valve Modulator
B04= D.H.W. Probe Sensor Cylinder (RFFI SYSTEM models only)
B05= Heating Sensor
B06= Pressure Switch for Heating Circuit
B07= Microswitch for Diverter Valve (MFFI models only)
Colours
Gry = Grey
Rd = Red
Bl = Blue
Grn/Yll = Yellow/Green
Wh = White
Brn = Brown
Blk = Black
Wh/Rd = White/Red
Page 28
28
B005
GENUS 23/27/30 MFFI
GENUS 27 RFFI SYSTEM
Aa
Aa
Page 29
29
B005
GENUS 23/27 MFFI
GENUS 27 RFFI SYSTEM
CN202
P
P
Page 30
30
B005
4. SHORT SPARE PARTS LIST
GENUS 23/27 MFFI (SIT Sigma Gas Valve)
2
71
1
2
3
4
5
4
6
7
8
9
10
11
12
13
14
11
15
86
72
73
4
4
7
87
88
85
89
90
92
91
18
74
62
78
80
83
86
84
85
89
91
94
67 59 56
66 58 5760
65 63666568696370
74
75
76
77
79
81
11
82
102
101
100
95
99
96
84
93
23
6264
98
98
97
61
74
123
119
118
103
104
105
106
122
121
117
120
124
81
116
109
108
107
115
110
111
48
114
112
301
304
303
302
113
51
44
44
39
36
301
305
306
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
16
17 18 19 2320 21 22 24 2625
100 16
364
361
362
27
29 34
323128
3330
35 37
36
363
321
17
371
372
373
374
375
311
22
23/27 MFFI
Page 31
31
B005
GENUS 30 MFFI (SIT Sigma Gas Valve)
2
72
1
2
3
4
5
4
6
7
8
9
10
11
12
13
14
15
11
16
87
73
74
4
4
7
88
89
86
90
91
93
92
18
75
63
79
81
84
87
85
86
90
92
95
68 57
67 61
75
76
77
78
80
11
85
94
24
66 64676669706471
82
83
103
102
101
96
100
97
6365
99
99
98
62
75
120
119
104
105
106
107
126
124
123
122
121
118
60 59 58
125
82
117
110
109
108
116
111
112
49
115
113
301
304
303
302
114
52
45
45
40
37
301
305
306
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
17
18 19 20 2421 22 23 25 2726
101 17
364
361
362
28
30 35
333229
3431
36 38
37
363
321
18
371
372
373
374
375
311
23
30 MFFI
Page 32
32
B005
GENUS 27 RFFI SYSTEM (SIT Sigma Gas Valve)
2
73
1
2
3
4
5
4
6
7
8
9
10
11
12
13
14
11
15
16
17
74
75
4
4
7
11
16
23
76
64
80
82
85
86
90
11
69 61 58
68 60 5962
76
77
78
79
81
83
11
86
89
91
23
67 65686770716572
84
97
87
95
94
88
6466
63
76
118
114
113
98
99
96
93
93
92
101
117
116
115
112
119
100
83
102
111
104
103
110
105
106
50
109
107
301
304
303
302
108
53
46
46
41
38
301
305
306
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
24
1918 21 22 23 26 27 28
252320
20 95
371
372
373
374
375
321
19
362
361
363
29
31
36
3330
34 3532
37
27 MFFI SYSTEM
39
38
Page 33
33
B005
GENUS 23/27 MFFI (SIT Sigma Gas Valve)
573294
573520
997206
573224
569236
573340
573528
573727
573172
571649
997208
953045
952981
952610
572989
572990
573343
573314
571651
571652
570717
564254
569387
571449
571646
573295
573825
571807
573521
997150
997151
571965
574279
574232
574233
573441
569390
569560
569561
572271
572277
572343
572372
572749
572835
571993
571444
997029
571443
571442
571447
571446
571547
571772
571771
571770
573138
569281
569282
Key
no.
G.C. part
no.
ARISTON
Part No.
Description
1
11
14
17
18
19
23
24
25
28
31
43
45
46
56AB
56CD
57
60
71AB
71CD
74
83
84
86
88AB
88CD
89
91
94
95AB
95CD
98
99
100
106
110
114
116
117
118A
118B
118C
118D
119AB
119CD
301
311
321
361
362
363
364
371
372
373
374
375
381
382
379816
164 225
164 338
164 229
378 814
E03 818
E02 071
379 079
164 230
164 282
379 981
164 261
379 979
379 980
E02 026
E02 078
164 311
Expansion vessel
Gasket 3/4"
Overheat thermostat
Main flow Switch
Temp probe (C.H.W.)
Microswitch for 3-way/main flow group
Gasket 1/2"
Manual vent cock
Safety valve 3 bar 1/2"
Pressure gauge
Time clock
P.C.B. E C-MI/FFI
P.C.B. EI A-MFFI
P.C.B. cable
Fan
Fan
Fan inlet gasket
Venturi (exhaust manifold/header)
Air pressure switch
Air pressure switch
Fastening spring
Automatic air release valve
Gasket 1"
O-ring
Secondary exchanger (plate-type) exchanger 23kW
Secondary exchanger (plate-type) exchanger 27kW
O-ring (secondary exchanger)
20-18 O-ring
Gasket 3/8"
Pump
Pump
O-ring (13)
Gasket
Gas valve (SIT Sigma)
Spark generator
Detection electrode
Gasket 1/4"
Ignition electrode (R.H.)
Ignition electrode (L.H.)
Main burner
Main burner
Main burner
Main burner
Main exchanger
Main exchanger
Front panel runner kit
D.H.W. actuator kit
SIT Sigma gas valve operator coils
Heating by-pass kit
D.H.W. pressure switch kit
3-way spring kit
D.H.W. diaphram valve
Main flow switch diaphram
Main flow switch magnet
Main flow switch spring
Main flow switch top cap
Main flow switch reed system
Burner jet 1.25 full kit (Natural gas)
Burner jet 0.72 full kit (LPG)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Page 34
34
B005
GENUS 30 MFFI (SIT Sigma Gas Valve)
573294
573520
997206
573224
569236
573340
573528
573727
573172
571649
997208
953045
952981
952610
572990
573343
571652
570717
564254
569387
571449
573295
573825
571807
573521
997151
571965
574279
574232
574233
573441
569390
569560
569561
998110
998111
572835
573314
571993
571444
997029
571443
571442
571447
571446
571547
571772
571771
571770
573138
998152
998432
Key
no.
G.C. part
no.
ARISTON
Part No.
Description
1
11
15
16
19
20
24
25
26
29
32
44
46
47
57
58
72
75
84
85
87
89
90
92
95
96
99
100
101
107
111
115
117
118
119A
119B
120
126
301
311
321
361
362
363
364
371
372
373
374
375
381
382
379816
164 225
164 338
164 229
378 814
E02 071
379 079
164 230
164 282
379 981
164 261
379 979
379 980
Expansion vessel
Gasket 3/4"
Overheat thermostat
Main flow Switch
Temp probe (C.H.W.)
Microswitch for 3-way/main flow group
Gasket 1/2"
Manual vent cock
Safety valve 3 bar 1/2"
Pressure gauge
Time clock
P.C.B. E C-MI/FFI
P.C.B. EI A-MFFI
P.C.B. cable
Fan
Fan inlet gasket
Air pressure switch
Fastening spring
Automatic air release valve
Gasket 1"
O-ring
Secondary exchanger (plate-type) exchanger 27kW
O-ring (secondary exchanger)
O-ring (20-18)
Gasket 3/8"
Pump
O-ring (13)
Gasket
Gas valve (SIT Sigma)
Spark generator
Detection electrode
Gasket 1/4"
Ignition electrode (R.H.)
Ignition electrode (L.H.)
Main burner
Main burner
Main exchanger
Venturi (exhaust manifold/header)
Front panel runner kit
D.H.W. actuator kit
SIT Sigma gas valve operator coils
Heating by-pass kit
D.H.W. pressure switch kit
3-way spring kit
D.H.W. diaphram valve
Main flow switch diaphram
Main flow switch magnet
Main flow switch spring
Main flow switch top cap
Main flow switch reed system
Burner jet 1.30 full kit (Natural gas)
Burner jet 0.77 full kit (LPG)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Page 35
35
B005
GENUS 27 RFFI SYSTEM (SIT Sigma Gas Valve)
573294
573520
997206
997147
573224
569236
573528
573727
573172
950650
571649
997208
953095
952935
952610
572990
573343
573314
571652
570717
564254
569387
997151
573521
571965
574279
574232
574233
573441
569390
569560
569561
572343
572372
572835
571993
997029
571443
571987
571447
573138
569281
569282
Key
no.
G.C. part
no.
ARISTON
Part No.
Description
1
11
14
17
20
21
23
25
26
28
30
33
45
47
48
58
59
62
73
76
85
86
87
89
93
94
95
101
105
109
111
112
113A
113B
114
301
321
361
362
363
375
381
382
379816
164 225
164 338
164 229
378 814
E02 071
379 079
164 282
379 981
164 261
379 979
379 980
E02 078
164 311
Expansion vessel
Gasket 3/4"
Overheat thermostat
Motorised valve motor
Main flow switch
Temp probe (C.H.W.)
Gasket 1/2"
Manual vent cock
Safety valve 3 bar 1/2"
D.H.W. probe
Pressure gauge
Time clock
P.C.B. EB C MI/FFI
P.C.B. E A-FFI/P
P.C.B. cable
Fan
Fan inlet gasket
Venturi (exhaust manifold/header)
Air pressure switch
Fastening spring
Automatic air release valve
Gasket 1"
Pump
Gasket 3/8"
O-ring (13)
Gasket
Gas valve (SIT Sigma)
Spark generator
Detection electrode
Gasket 1/4"
Ignition electrode (R.H.)
Ignition electrode (L.H.)
Main burner
Main burner
Main exchanger
Front panel runner kit
Sit Sigma gas valve operator coils
Heating by-pass kit
Sanitary pressure switch kit
Way and unit kit
Main flow switch reed system
Burner jet 1.25 full kit (Natural gas)
Burner jet 0.72 full kit (LPG)
Page 36
36
B005
GENUS 23/27 MFFI (SIT Tandem Gas Valve)
2
71
1
2
74
67 59 56
66 58 5760
65 63666568696370
6264
61
3
4
5
4
6
7
8
9
10
11
12
13
14
11
15
86
72
73
4
4
7
87
89
90
18
86
88
85
89
92
91
91
74
75
62
76
77
78
79
80
81
82
83
84
85
96
101
95
84
94
93
23
74
126
301
125
124
123
122
81
121
120
110
104
105
119
111
109
107
11
97
98
99
100
102
103
104
117
118
112
108
106
113
48
302
116
115
114
51
39
303
304
44
44
36
301
305
306
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
16
17 18 19 2320 21 22 24 2625
17
371
99
321
372
373
374
375
16 22
364
322
323
361
362
363
311
27
29 34
323128
3330
35 37
36
23/27 MFFI
Page 37
37
B005
GENUS 30 MFFI (SIT Tandem Gas Valve)
2
72
1
2
3
4
5
4
6
7
8
9
10
11
12
13
14
15
11
16
87
73
74
4
4
7
88
89
86
90
91
93
92
19
75
63
79
81
84
87
85
86
90
92
95
68 60 57
67 59 5861
75
76
77
78
80
83
97
85
94
24
66 64676669706471
82
11
101
102
103
96
104
98
99
100
105
6365
62
75
126
122
121
112
111
110
105
106
128
125
124
123
120
108
127
82
119
109
107
118
113
114
49
117
115
301
304
303
302
116
52
45
45
40
37
301
305
306
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
17
18 19 20 2421 22 23 25 2726
18
371
100
321
372
373
374
375
17 23
364
322
323
361
362
363
311
28
30 35
333229
3431
36 38
37
30 MFFI
Page 38
38
B005
GENUS 27 RFFI SYSTEM (SIT Tandem Gas Valve)
2
73
1
2
76
69 61 58
68 60 59
67 65686770716572
6466
62
63
3
4
5
4
6
7
8
9
10
11
12
13
14
11
15
16
17
74
75
4
4
7
90
11
16
23
76
77
64
78
79
80
81
82
83
84
85
86
87
88
86
89
91
11
23
76
121
301
120
119
118
117
83
116
115
11
100
99
98
97
96
95
94
93
101
114
102
103
93
104
92
112
113
107
106
105
108
50
302
111
110
109
53
41
303
304
46
46
38
301
305
306
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
1918 21 22 23 26 27 28
24
252320
20 98
371
321
372
373
374
375
322
323
19
362
361
363
29
31
36
3330
34 3532
37
27 MFFI SYSTEM
39
38
Page 39
39
B005
GENUS 23/27 MFFI (SIT Tandem Gas Valve)
573294
573520
997206
573224
569236
573340
573528
573727
573172
571649
997208
953045
952981
952610
572989
572990
573343
573314
571651
571652
570717
564254
569387
571449
571646
573295
573825
571807
573521
997150
997151
570732
573023
571965
573441
569390
569560
569561
572271
572277
572343
572372
572749
572835
571993
571444
570712
573740
573745
571443
571442
571447
571446
571547
571772
571771
571770
573138
569281
569282
Key
no.
G.C. part
no.
ARISTON
Part No.
Description
1
11
14
17
18
19
23
24
25
28
31
43
45
46
56AB
56CD
57
60
71AB
71CD
74
83
84
86
88AB
88CD
89
91
94
96AB
96CD
99
104
112
116
118
119
120A
120B
120C
120D
121AB
121CD
301
311
321
322
323
361
362
363
364
371
372
373
374
375
381
382
379816
164 225
164 338
164 229
378 814
E03 818
E02 071
379 079
164 230
164 282
379 976
379 981
164 261
379 979
379 980
E02 026
E02 078
378 978
378 815
164 303
164 311
Expansion vessel
Gasket 3/4"
Overheat thermostat
Main flow Switch
Temp probe (C.H.W.)
Microswitch for 3-way/main flow group
Gasket 1/2"
Manual vent cock
Safety valve 3 bar 1/2"
Pressure gauge
Time clock
P.C.B. E C-MI/FFI
P.C.B. EI A-MFFI
P.C.B. cable
Fan
Fan
Fan inlet gasket
Venturi (exhaust manifold/header)
Air pressure switch
Air pressure switch
Fastening spring
Automatic air release valve
Gasket 1"
O-ring
Secondary exchanger (plate-type) exchanger 23kW
Secondary exchanger (plate-type) exchanger 27kW
O-ring (secondary exchanger)
O-ring (20-18)
Gasket 3/8"
Pump
Pump
Gas valve (SIT Tandem)
Spark generator
O-ring (13)
Detection electrode
Gasket 1/4"
Ignition electrode (R.H.)
Ignition electrode (L.H.)
Main burner
Main burner
Main burner
Main burner
Main exchanger
Main exchanger
Front panel runner kit
D.H.W. actuator kit
SIT Tandem gas valve operator coils
SIT Tandem modureg coil
Gas modulator cartridge
Heating by-pass kit
D.H.W. pressure switch kit
3-way spring kit
D.H.W. diaphram valve
Main flow switch diaphram
Main flow switch magnet
Main flow switch spring
Main flow switch top cap
Main flow switch reed system
Burner jet 1.25 full kit (Natural gas)
Burner jet 0.72 full kit (LPG)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
101
Page 40
40
B005
GENUS 30 MFFI (SIT Tandem Gas Valve)
573294
573520
997206
573224
569236
573340
573528
573727
573172
571649
997208
953045
952981
952610
572990
573343
571652
570717
564254
569387
571449
573295
573825
571807
573521
997151
570732
573023
571965
573441
569390
569560
569561
998110
998111
572835
573314
571993
571444
570712
573740
573745
571443
571442
571447
571446
571547
571772
571771
571770
573138
998152
998432
Key
no.
G.C. part
no.
ARISTON
Part No.
Description
1
11
15
18
19
20
24
25
26
29
32
44
46
47
57
58
72
75
84
85
87
89
90
92
95
97
100
105
113
117
119
120
121A
121B
122
128
301
311
321
322
323
361
362
363
364
371
372
373
374
375
381
382
379816
164 225
164 338
164 229
378 814
E02 071
379 079
164 230
164 282
379 976
379 981
164 261
379 979
379 980
378 978
378 815
164 303
Expansion vessel
Gasket 3/4"
Overheat thermostat
Main flow Switch
Temp probe (C.H.W.)
Microswitch for 3-way/main flow group
Gasket 1/2"
Manual vent cock
Safety valve 3 bar 1/2"
Pressure gauge
Time clock
P.C.B. E C-MI/FFI
P.C.B. EI A-MFFI
P.C.B. cable
Fan
Fan inlet gasket
Air pressure switch
Fastening spring
Automatic air release valve
Gasket 1"
O-ring
Secondary exchanger (plate-type) exchanger 27kW
O-ring (secondary exchanger)
O-ring (20-18)
Gasket 3/8"
Pump
Gas valve (SIT Tandem)
Spark generator
O-ring (13)
Detection electrode
Gasket 1/4"
Ignition electrode (R.H.)
Ignition electrode (L.H.)
Main burner
Main burner
Main exchanger
Venturi (exhaust manifold/header)
Front panel runner kit
D.H.W. actuator kit
SIT Tandem gas valve operator coils
SIT Tandem modureg coil
Gas modulator cartridge
Heating by-pass kit
D.H.W. pressure switch kit
3-way spring kit
D.H.W. diaphram valve
Main flow switch diaphram
Main flow switch magnet
Main flow switch spring
Main flow switch top cap
Main flow switch reed system
Burner jet 1.30 full kit (Natural gas)
Burner jet 0.77 full kit (LPG)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
102
Page 41
41
B005
GENUS 27 RFFI SYSTEM (SIT Tandem Gas Valve)
573294
573520
997206
997147
573224
569236
573528
573727
573172
997274
571649
997208
953095
952935
952610
572990
573343
573314
571652
570717
564254
569387
997151
573521
571965
573023
570732
573441
569390
569560
569561
572343
572372
572835
571993
571444
570712
573740
573745
571443
571442
571447
571547
571772
571771
571770
573138
998152
998432
Key
no.
G.C. part
no.
ARISTON
Part No.
Description
1
11
14
17
20
21
23
25
26
28
30
33
45
47
48
58
59
62
73
76
85
86
87
89
93
96
98
107
111
113
114
115A
115B
115
301
311
321
322
323
361
362
363
371
372
373
374
375
381
382
164 225
164 338
164 229
378 814
E02 071
379 079
164 230
164 282
379 976
379 981
164 261
379 979
379 980
E02 078
378 978
378 815
164 303
164 311
Expansion vessel
Gasket 3/4"
Overheat thermostat
Motorised valve motor
Main flow switch
Temp probe (C.H.W.)
Gasket 1/2"
Manual vent cock
Safety valve 3 bar 1/2"
D.H.W. probe
Pressure gauge
Time clock
P.C.B. EB C MI/FFI
P.C.B. E A-FFI/P
P.C.B. cable
Fan
Fan inlet gasket
Venturi (exhaust manifold/header)
Air pressure switch
Fastening spring
Automatic air release valve
Gasket 1"
Pump
Gasket 3/8"
O-ring (13)
Spark generator
Gas valve (SIT Tandem)
Detection electrode
Gasket 1/4"
Ignition electrode (R.H.)
Ignition electrode (L.H.)
Main burner
Main burner
Main exchanger
Front panel runner kit
D.H.W. actuator kit
SIT Tandem gas valve operator coils
SIT Tandem modureg coil
Gas modulator cartridge
Heating by-pass kit
D.H.W. pressure switch kit
3-way spring kit
Main flow switch diaphram
Main flow switch magnet
Main flow switch spring
Main flow switch top cap
Main flow switch reed system
Burner jet 1.25 full kit (Natural gas)
Burner jet 0.72 full kit (LPG)
Page 42
42
B005
NOTES
Page 43
43
B005
Page 44
Manufacturer: Merloni TermoSanitari SpA - Italy
Commercial subsidiary: MTS (GB) LIMITED
MTS Building
Hughenden Avenue,
High Wycombe
Bucks HP13 5FT
Telephone: (01494) 755600 Fax:(01494) 459775
Technical Service Hotline: (01494) 539579
23 99 84 1267 000 - B005 Stampa: Bieffe Recanati
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