Biasi RIVA COMBI User manual

BOILER SERVICE INSTRUCTIONS
MANUAL
COMBI
WALL HUNG GAS BOILER FOR
CENTRAL HEATING AND DOMESTIC
HOT WATER SUPPLY
Please Read Instructions Carefully
Save for Future Reference
— Do not store or use gasoline or other flammable vapors and liquids
in the vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in your
building.
• Immediately call your gas supplier from a neighbor’s phone.
Follow the gas supplier’s instructions.
• If you can not reach your gas supplier call the fire department.
— Installation and service must be performed by a qualified installer,
service agency or the gas supplier.
WARNING: If the information in this manual is not
followed exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
Manufactured by:
Biasi S.p.A.
Verona, Italy
Distributed By:
Quincy Hydronic Technologies, Inc.
80 Rochester AVE. Suite # 12
Portsmouth, NH 03801
Phone: [phone]
Fax: [phone]
RIVA COMBI SERVICE MANUAL - REV A
*17562.0183.0*
17562.0183.0 0406
(
57A4
)
US
A

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First Part Service Manual
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RIVA COMBI SERVICE MANUAL – REV A 2

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First Part Service Manual
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RIVA COMBI SERVICE MANUAL – REV A 3
1 The Technical Manual
The aim of this manual is to provide technical
assistance operators with all the information
necessary to facilitate maintenance of Biasi.
products.
To use this manual in the best possible way
and to find the information in it quickly it is
necessary to understand how it is laid out by
reading the following carefully:
2 Manual layout
The manual is divided into three different parts
(fig. 1).
The first part contains the general instructions
on how to use and consult the manual; the
nomenclature of the models illustrated in this
manual and the grouping criteria for each
family.
The second part contains booklets with
technical data, hydraulic and wiring diagrams,
troubleshooting instructions and start-up
checks, grouped into product families.
The third part contains the technical data
sheets relative to each component, its basic
characteristics, checking its condition and
replacing and/or servicing.
fig. 1
Parts two and three are preceded by an index
that gives the contents and their order of
arrangement.
3 Topic, numbering, edition
The topic dealt with on each card is also shown
in the top outer corner of each page, the part in
the inner top corner. The pages are numbered
in the bottom corner (fig. 2).
Technical sheet edition date (month and year)
is given between part and argument on top of
the page.
fig. 2
Part one is laid out with consecutive numbers
(fig. 3).
135
fig. 3
Part two is arranged on two levels (fig. 4). The
first gives the acronym of the family to which
the technical sheet belongs; the number that
follows indicates technical sheet order
sequence inside each family.
M35.30CB - 7
M35.30CB - 5
M35.30CB - 3
M35.30CB - 1
first level second level
fig. 4
Part three is also arranged on two levels (fig.
5); the first is a number assigned to each
component, the second indicates technical

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First Part Service Manual
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RIVA COMBI SERVICE MANUAL – REV A 4
sheet order sequence. Correspondence
between component and number is given in the
index at the beginning of part three.
1-1 1-3 2-1 2-3
fig. 5
4 Updating
The evolution of Biasi products entails updating
the technical assistance personnel and relative
documentation.
The updated documentation which will be sent
to the Assistance Service Centres, whether in
the shape of a circular or technical sheets to be
added to the manual or to replace others, must
be properly inserted.
All technical service personnel must be
informed immediately of their contents.
5 Models
All models of products manufactured are
identified with a name. This name (from here
referred to as model) is determined by the
unitÕs construction characteristics (fig. 6)
M35.30CB
Max useful power in c.h.
30 = 30,00 kW (25 800 kcal/h)
C = Sealed Chamber
Boiler series
B = With Storage Tank
fig. 6
The information contained in this manual is
applicable to the following models:
M35.30CB
6 Serial number
Each unit has its own serial number, the
meaning of which is given in fig. 7).
N210250205
Progressive number
Gas Type
N = Natural
G = L.P.G.
Construction month and year
fig. 7
7 Series
The boilers are grouped into families in part two
of this manual, each group including models
with identical construction features and, hence,
with identical maintenance.
Within each family the models differ only in their
nominal thermal capacity or other
characteristics that do not call for different
maintenance.
Series Models
M35------------------|M35.30CB

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Second Part M35.30CB Maintenance Characteristic Verification
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RIVA COMBI SERVICE MANUAL – REV A
Summary
Page
OVERALL VIEW………………………………………………………….…M35.30CB - 1
HYDRAULIC DIAGRAM……………………………………………………M35.30CB - 1
ELECTRICAL DIAGRAM………………………………………………..…M35.30CB - 2
GAS ADJUSTMENT DATA………………………………………………..M35.30CB - 3
FAULT FINDING………………………………………………………….…M35.30CB - 4-5
CIRCUIT VOLTAGES………………………………………………………M35.30CB - 6
OPERATION LIGHTS………………………………………………………M35.30CB - 7
START UP CHECKS………………………………………………………..M35.30CB - 7
GAS CONVERSION…………………………………………………...……M35.30CB - 8

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Second Part M35.30CB Maintenance Characteristic Verification
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RIVA COMBI SERVICE MANUAL – REV A

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Second Part M35.30CB Maintenance Characteristic Verification
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RIVA COMBI SERVICE MANUAL – REV A M35.30CB - 1
1 Overall View
Pump
Pump vent plug
Burner
Flame-detec
ting electrode
Combustion
chamber
Primary heat
exchanger
Ignition
electrodes
Fan
Gas valve inlet
pressure test point
Modulation
operator
Air pressu
re switch
Gas valve outlet
pressure test point
C.h. expan
sion vessel
Main circuit air
breathe valve
C.h. temp.
probe NTC
C.h.
PRV
Safety
thermostat
Control
panel
D.h.w.
PRV
D.h.w. sto
rage tank
Primary circuit
flow switch
Three way
diverter valve
Modulation
gas valve
D.h.w. expan
sion vessel
Automatic air
purger valve
Air pressure
switch test points
Gas
Main circuit
drain cock
C.h.
return
C.h.
flow D.h.w
. inlet
D.h.w.
outlet D.h.w
. PRV C.h.
PRV
D.h.w. tempera
ture probe NTC Storage tank
drain cock
Magnesium
anode
fig. 1
2 Hydraulic Diagram
C.h. water return
C.h. water flow
D.c.w.inle
t
D.h.w.outlet
fig. 2

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Second Part M35.30CB Maintenance Characteristic Verification
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RIVA COMBI SERVICE MANUAL – REV A M35.30CB - 2
3 Electrical Diagram
ye bk wh gy bu rd
bk gy
gy
gy
M
~
M
~
tt
probe NTC
D.h.w. Temperature
Probe NTC C.h. temperature
COM
NO
M
~
COM
NO
NC
123 bk
bubn
rd
rd
gnyegywh
bu
rd
bk
bu
wh
gybugnye
bk bk
rd bk wh gygnye bu
bk
bk
bubu
bu
bu
rdbk
gygy
bubn
bn
bu
L N
rd bu bn gnye gnye
gnye bubn
burd
gnye
rd
wh
bk
Flow Switch
Primary Circuit
diverter valve
Three way Pump
Valve
Gas
External Controls
Terminal
Block
Electric Supply
Terminal
Block
Fan Safety
Thermostat
Air Pressure
Switch
Ignition
Electrodes
Flame Detection
Electrode
bn - brown
bu - blue
bk - black
wh - white
rd - red
gy - grey
ye - yellow
vt - violet
og - orange
gnye - green/yellow
1
3
2
wh
gy
rd
rd
bk
bu
bn
gy
ye wh burd
1
bk
rd
*
* ---> directly connected to the electronic ignition board
fig. 3

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Second Part M35.30CB Maintenance Characteristic Verification
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RIVA COMBI SERVICE MANUAL – REV A M35.30CB - 3
4 Gas Adjustment Data
Maximum gas pressure at the injectors
Natural (G20)
Propane (G31)
inwc
inwc
5.3
9.0
Minimum gas pressure at the injectors
Natural (G20)
Propane (G31)
inwc
inwc
0.8
1.4
Ignition pressure
Natural (G20)
Propane (G31)
inwc
inwc
2.4
5.2
Maximum gas rate
Natural (G20)
Propane (G31)
ft³/h
lb/h
121.1
5.55
Minimum gas rate
Natural (G20)
Propane (G31)
ft³/h
lb/h
48.7
2.23
Injectors
Natural (G20)
Propane (G31)
n°/Ф14/130
14/89
Useful output KW
Kcal/h
10.8
9288
12.0
10320
14.0
12040
17.0
14620
20.0
17200
23.0
19780
26.0
22360
29.5
25370
Pa
inwc
220
0.88
250
1.00
330
1.32
470
1.89
640
2.57
830
3.33
1050
4.22
1330
5.34
Natural
m³/h 48.7 53.0 60.7 72.4 84.0 96.0 107.7 121.1
Pa
inwc
360
1.45
420
1.69
560
2.25
800
3.21
1080
4.34
1400
5.62
1760
7.06
2230
8.95
Propane
lb/h 2.2 2.4 2.8 3.3 3.9 4.4 4.9 5.5

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Second Part M35.30CB Maintenance Characteristic Verification
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RIVA COMBI SERVICE MANUAL – REV A M35.30CB - 4
5 Fault Finding

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Second Part M35.30CB Maintenance Characteristic Verification
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RIVA COMBI SERVICE MANUAL – REV A M35.30CB - 5

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Second Part M35.30CB Maintenance Characteristic Verification
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RIVA COMBI SERVICE MANUAL – REV A M35.30CB - 6
6 Circuit Voltages
Flow Switch
Primary Circuit
diverter valve
Three way
Pump
Supply
Network
Gas Valve
120~
0
120~
0
0
120~
120~
24~
Control p.c.b.
0,3=
Fan
Safety
Thermostat
0
120~
Air pressure
Switch
00
Control p.c.b.
120~
Fan and Air Pressure
Device
120~
Fan and Air Pressure
Device
Full Sequence Device
120~
120~
Electrical voltages with burner on
1
During c.h. or d.h.w. operation
Only during C.h. operation
Only during d.h.w. operation

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Second Part M35.30CB Maintenance Characteristic Verification
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RIVA COMBI SERVICE MANUAL – REV A M35.30CB - 7
7 Operation Lights
The Electronic control p.c.b. is provided with
three lamps (LED indicators) that give optical
information during the opeation of the boiler.
The green lamp on the left gives information
whether the boiler is in stand-by mode or during
the normal operation of the boiler.
The following table gives the relationship
between the lamp indication and its meaning.
8 Start-up Checks
1) Connection to the gas supply system:
Check that current regulations have been
complied with and that safe running and use
are guaranteed.
Check that there are no leaks.
2) Gas supply pressure:
Check gas supply pressure at valve input
when the boiler is off and when it is running
at full power. Carry out the same check if
there are any other user points on.
3) Connection to the electrical system:
Check for proper connection to the power
supply and to external control devices.
Check that the unit is connected to the
electrical protection system (earth).
4) Check the C.h. circuit:
Check that the circuit is properly filled at a
suitable pressure and that there are no leaks
Check it is correctly bled of air.
5) Combustion by-product expulsion system:
Check that the flue pipe and the air intake
pipe have been made correctly and
mechanical stability is guaranteed.
6) Correct operation:
When starting the boiler check the burner
maximum, minimum and ignition gas
pressures.
Check that the Venturi pressure is sufficient
to ensure proper operation.
Check that the unit runs properly in the c.h.
mode and in the d.h.w. mode using the
function knob of the control panel.
7) Safety and control devices:
Check that safety thermostat, ignition
device, air pressure switch, and the main
circuit flow switch work properly.
8) Instruct the user on how to use the unit
correctly and explain to him the functions of
the external commands, the actions he
needs to take and what to do in case of
malfunction or emergency.

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Second Part M35.30CB Maintenance Characteristic Verification
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RIVA COMBI SERVICE MANUAL – REV A M35.30CB - 8
9 Gas Conversion
1) Check that the gas cock fitted on the gas
supply pipe is turned off and the appliance is
switched off at the circuit breaker.
2) Remove the front and side panels of the case.
3) Take off the lid of the sealed chamber.
4) Loosen the screws A on figure 9.1 and move
to the left the side panel of the combustion
chamber.
1
2
3,5 cm
A
A
B
C
Figure 9.1
5) Loosen the screws B and remove the air
deflector (figure 9.1).
6) Loosen the screws C and remove the front
panel of the combustion chamber moving it to
the left for about 1.5 in, rotating it inside the
combustion chamber (figure 9.1 follow the
arrows) and then pulling it outside the
combustion chamber (figure 9.2).
3
Figure 9.2
7) Remove the connections of the ignition and
detection electrodes.
8) Remove the burner moving it to the left,
rotating it upward and then pulling it outside
the combustion chamber (follow the arrows on
figure 9.3).
2
1
3
Figure 9.3
9) Carry out the conversion for the type of gas,
replacing the burner injectors correctly.
10) Re-assemble the burner, the front panel of
the combustion chamber and the lid of the
sealed chamber.
11) Extract the control panel.
12) Loosen the screws K and remove the service
panel (figure 9.4)
K
K
K
Figure 9.4
13) Set correctly the dip-switch "2" to the correct
position (Fig. 9.5) in accordance with the
following table.
Gas supply Position of the switch 2
Natural gas On
L.P.G. Off
ON
OFF
123
4
ON
OFF
1
2
34
Natural gas L.P.G.
Figure 9.5
14) Close the service panel.
15) Turn on the boiler.
16) Calibrate the gas valve according to the
instructions given in the section 9 of the third
part of this manual.
17) Set the correct gas pressure for central
heating output required.
18) Stick on the inside of the left hand side panel
adjacent to the data badge the self-adhesive
label (included with the conversion kit)
indicating the type of gas, and the gas
pressures to which the appliance has been
set.
19) Reassemble the front and side panels of the
case.

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RIVA COMBI SERVICE MANUAL – REV A
Summary
O General Access and Emptying the Hydraulic Circuits 1-1
Nomenclature 1-1
Body Panels 1-1
Control Panel 1-2
Access to the Sealed Chamber 1-2
Emptying the Primary Circuit 1-2
Emptying the Dh.w. Circuit 1-3
O Primary Heat Exchanger 2-1
Function 2-1
Removal 2-1
Cleaning 2-2
O D.h.w. Storage Tank 3-1
Function 3-1
Removal of the Magnesium Anode 3-1
Internal Cleaning of Tank and Removal of Tank Flange 3-1
Removal of the Storage Tank 3-2
OPump 4-1
Function 4-1
Checks 4-1
Removal 4-1
O Three Way Diverter Valve 5-1
Function 5-1
Checks 5-1
Removal of Electric Actuator 5-1
Removal of Diverter Group and Its Internal Parts 5-2
O Control p.c.b. 11.62 6-1
Function 6-1
Selection and Adjustment Devices 6-1
Checking the Temperature 6-2
Operation Lights 6-2
Dip-switch Selectors 6-3
Ignition Gas Pressure Adjustment 6-4
Max C.h. Power Regulation 6-4
Anti-frost System 6-4
Uniform Temperature System 6-4
Hydraulic Parts Checking System 6-4
Advanced Probe Control System 6-4
Checks 6-5
Removal of the Control p.c.b. 6-5
Thermal Control in Winter Mode 6-6

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RIVA COMBI SERVICE MANUAL – REV A
Thermal Control in Summer Mode 6-6
O Fan and Air Pressure Device 11.61 7-1
Function 7-1
Checks 7-1
Removal 7-1
O Full Sequence Ignition Device S4567A-1019 8-1
Function 8-1
Checks 8-1
Removal 8-1
Ignition and Control Sequence 8-2
O Modulating Gas Valve 9-1
Function 9-1
Nomenclature 9-1
Adjustment 9-1
Checks 9-2
Removal of the Gas Valve 9-2
O Primary Circuit Flow Switch 10-1
Function 10-1
Checks 10-1
Removal 10-1
O Expansion Vessels and Temperature-Pressure Gauge 11-1
Function 11-1
Checks 11-1
Removal of the C.h. Expansion Vessel 11-1
Removal of the D.h.w. Expansion Vessel 11-2
Removal of the Temperature-Pressure Gauge 11-2
O Temperature Probe NTC 12-1
Function 12-1
Checks 12-1
Removal 12-1
O Fan, Venturi Device and Air Pressure Switch 13-1
Function 13-1
Checks 13-1
Removal of the Fan 13-2
Inspection and Removal of the Venturi Device 13-2
Removal of the Air Pressure Switch 13-2
O Ignition and Detection Electrodes, Burner and Injectors 14-1
Function 14-1
Checks 14-1
Removal 14-1

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RIVA COMBI SERVICE MANUAL – REV A
O Safety Thermostat 15-1
Function 15-1
Checks 15-1
Removal 15-1
O Electric Resistances 16-1
Pump Resistance 16-1
Gas Valve Resistance 16-1
Temperature Probe NTC Resistance 16-1
Fan Resistance 16-1
O Short Spare Parts List 17-1

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RIVA COMBI SERVICE MANUAL – REV A

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Third Part (edition-0106) General Access and Emptying Hydraulic Circuits
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RIVA COMBI SERVICE MANUAL – REV A 1-1
1 Nomenclature
3
2
1
4
5
Figure 1
1) Right Side Panel
2) Front Panel
3) Control Panel Lid
4) Control Panel Cover
5) Left Side Panel
2 Body Panels
Warning: Isolate the boiler from the mains
electricity supply before removing any
covering or component.
For the most part of the check and maintenance
operations it is necessary to remove one or more
panels of the case.
The side panels can be removed only after the
removal of the front panel.
To remove the front panel remove screws A
(Figure 2) , lift the panel and remove it.
B
A
B
Figure 2
To remove the side panels, remove the screws B
(Figure 2) and the screws C (Figure 3), bring the
base of the panels away from the boiler (Figure
4) and lift them, freeing them from the top hooks.
C
C
C
C
D
D
Figure 3
E
E
Figure 4
General Access and Emptying
Hydraulic Circuits
1) Nomenclature
2) Body Panels
3) Control Panel
4) Access to the Sealed Chamber
5) Emptying the Primary Circuit
6) Emptying the D.h.w. Circuit

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Third Part (edition-0106) General Access and Emptying Hydraulic Circuits
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RIVA COMBI SERVICE MANUAL – REV A 1-2
3 Control Panel
Warning: Isolate the boiler from the mains
electricity supply before removing any
covering or component.
To gain access to the parts located inside the
control panel proceed as follows:
1) Remove the front panel of the case.
2) Loosen the screws and C and D (Figure 3).
3) Remove the screws E (Figure 4).
4) Move the lower part of the side panels as
indicated in Figure 4 and pull the control
panel. When completely pulled out, the panel
can rotate 45° downwards to facilitate the
service operations on the internal parts.
K
K
K
K
K
F
F
F
Figure 5
5) Remove the screws F and remove the service
panel (Figure 5).
6) To gain access to the electronic control p.c.b.
and the fan and air pressure device remove
the screws K and remove the control panel lid
(Figure 5).
4 Access to the Sealed Chamber
To gain access to the parts contained in the
sealed chamber it is necessary to remove the lid
of the sealed chamber.
For this purpose, remove the front and side
panels of the case, remove the screws G as
indicated in Figure 6 and remove the lid.
G
Figure 6
5 Emptying the Primary Circuit
1) Close the pressure reducing automatic fill
valve.
2) Open the c.h. drain cock H (Figure 7).
3) Loosen the d.h.w. storage tank air purge valve
I (Figure 8).
H
Figure 7
I
Figure 8