Ariston GENUS 27 RFFI SYSTEM User manual

Installation Instructions
Type C Boilers
G.C.N: 41-116-01
47-116-20
LEAVE THESE INSTRUCTIONS
ADJACENT TO THE GAS METER
Country of destination: GB

2B004
TABLE OF CONTENTS 1. GENERAL INFORMATION
1.1 General Instructions
1.2 Technical Information
1.3 Overall View
2. INSTALLATION
2.1 Reference Standards
2.2 Siting the Appliance
2.3 Overall Dimensions
2.4 Clearances
2.5 Mounting the Appliance
2.6 Electrical Connection
2.7 Gas Connection
2.8 Water Connections
2.9 Flue Connection
2.10 Room Thermostat Connection
2.11 Electrical/System Diagrams
2.12 Water Circuit Diagrams
3. COMMISSIONING
3.1 Initial Preparation
3.2 Removing the Casing
3.3 Control Panel
3.4 Initial Start-up
3.5 Operational Adjustments
3.6 Combustion Analysis
3.7 Fume Discharge Monitoring
3.8 Boiler Safety Systems
3.9 Draining the System
4. GAS ADJUSTMENTS
- Gas Adjustment Table
4.1 Changing the Type of Gas
5. MAINTENANCE
6. MISCELLANEOUS
6.1 Wiring Diagram for Two Heating Zones
6.2 Wiring Diagram for Connection to Ariston Unvented Cylinder

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This manual is an integral and essential part of the product. It should be kept
with the appliance so that it can be consulted by the user and our authorised
personnel.
Please carefully read the instructions and notices about the unit contained in
this manual, as they provide important information regarding the safe installa-
tion, use and maintenance of the product.
For operating instructions please consult the separate User’s Manual.
Read the instructions and recommendations in these Installation Instructions
carefully to ensure proper installation, use and maintenance of the appliance.
Keep this manual in a safe place. You may need it for your own reference while
our Servicing Centre technicians or your installer may need to consult it in the
future.
This is a combined appliance for the production of central heating (C.H.) and
domestic hot water (D.H.W.).
This appliance must be used only for the purpose for which it is designed.
The manufacturer declines all liability for damage caused by improper or negli-
gent use.
No asbestos or other hazardous materials have been used in the fabrication of
this product.
Before connecting the appliance, check that the information shown on the data
plate and the table on pages 4-5 comply with the electric, water and gas mains
of the property.You will find the data plate on the reverse of the control panel.
The gas with which this appliance operates is also shown on the label at the
bottom of the boiler.
Do not install this appliance in a damp environment or close to equipment
which spray water or other liquids.
Do not place objects on the appliance.
Do not allow children or inexperienced persons to use the appliance without
supervision.
If you smell gas in the room, do not turn on light switches, use the telephone or
any other object which might cause sparks.
Open doors and windows immediately to ventilate the room.
Shut the gas mains tap (on the gas meter) or the valve of the gas cylinder and call
your Gas Supplier immediately.
If you are going away for a long period of time, remember to shut the mains gas
tap or the gas cylinder valve.
Always disconnect the appliance either by unplugging it from the mains or
turning off the mains switch before cleaning the appliance or carriyng out main-
tenance.
In the case of faults or failure, switch off the appliance and turn off the gas
tap. Do not tamper with the appliance.
For repairs, call your local Authorised Servicing Centre and request the use of
original spare parts. For in-guarantee repairs contact MTS (GB) Limited
Check the following at least once a year:
1- Check the seal of water connections, replacing the gaskets if necessary.
2- Check the seal of the gas connections, replacing the gaskets if necessary.
1. GENERAL
INFORMATION
User’s
Manual
1.1 General Information
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3- Check the general condition of the appliance and of the combustion
chamber visually.
4- Visual check of the combustion: clean burners if necessary.
5- With reference to point 3, dismantle and clean the combustion chamber if
necessary.
6- With reference to point 4, dismantle and clean the injectors if necessary.
7- Visual check of the primary heat exchanger:
- check for overheating of the exchangers fins;
- clean the exhaust side of the exchanger and fan if necessary.
8- Regulate the gas pressure, ignition pressure, partial flame, maximum flame.
9- Check proper operation of the heating safety system:
- maximum safety temperature;
- maximum safety pressure.
10 - Check the proper operation of the gas safety system:
- gas or flame safety device;
- gas valve safety device.
11 - Check that the electrical connections have been made in compliance with
the instructions shown in the Installation Instructions.
12 - Check the efficiency of the hot water supply (flow and temperature).
13 - Check general operation of the appliance.
14 - Check the exhaust system for the combustion products.

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GENUS 30 MFFI
Legen :
1. Flue Connector
2. Combustion Chamber Hood
3. Main Heat Exchanger
4. Combustion Chamber Insulation Panel
5. Burner
6. Expansion Vessel
7. Overheat Thermostat
8. Spark Generator
9. Diverter Valve (MFFI)
Motorised Valve (RFFI)
10. Main Circuit Temperature Probe
11. Main Circuit Flow Switch
12. Domestic Hot Water Temperature Probe
13. Diverter Valve Microswitch
14. Filter Seat
15. Drain Valve
16. Secondary Heat Exchanger
17. Safety Valve (3 bar)
18. Circulation Pump with Automatic Air Release Valve
19. Gas Valve
20. Detection Electrodes
21. Ignition Electrodes
22. Fan
23. Venturi
24. Air Pressure Switch
GENUS 27 RFFI SYSTEM
Fig. 1.1
1.2 Overall View
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The technical information and instructions provided herein below are intended
for the installer so that the unit may be installed correctly and safely.
The installation and initial startup of the boiler must be by a CORGI Approved
Installer in compliance with the installation standards currently in effect, as well
as with any and all local health and safety standards i.e. CORGI.
This appliance must be installe by a competent installer in accor-
ance with the 1984 Gas Safety (installation & use) Regulations (as
amen e )
The installation of this appliance must be in accordance with the relevant
requirements of the 1984 Gas Safety (installation & use) Regulations, the Local
Building Regulations, the current I.E.E. Wiring Regulations, the byelaws of the
local water authority, and in Scotland, in accordance with the Building
Standards (Scotland) Regulation and Health and Safety document No. 635
“Electricity at work regs. 1989”.
Installation should also comply with the following British Standard Codes of
Practice:
The appliance may be installed in any room or indoor area, although particular
attention is drawn to the requirements of the current I.E.E. Wiring Regulations,
and in Scotland, the electrical provisions of the Building Regulations applicable
in Scotland, with respect to the installation of the combined appliance in a room
containing a bath or shower.
Where a room-sealed appliance is installed in a room containing a bath or
shower the boiler and any electrical switch or appliance control, utilising
mains electricity should be situated so that it cannot be touched by a per-
son using the bath or shower.
The location must permit adequate space for servicing and air circulation
around the appliance as indicated in paragraph 2.4.
The location must permit the provision of an adequate flue and termination.
For unusual locations special procedures may be necessary.
BS 6798-1987 gives detailed guidance on this aspect.
A compartment used to enclose the appliance must be designed specifically for
this purpose. No specific ventilation requirements are needed for an installation
within a cupboard
This appliance is not suitable for outdoor installation.
The type C appliances (in which the combustion circuit, air vent intake
an combustion chamber are air-tight with respect to the room in which
the appliance is installe ) can be installe in any type of room.
There are no limitations with respect to ventilation and the volume of the room
itself. The boiler must be installed on a solid, permanent wall to prevent access
to the electrical parts (when live) through the aperture on the back frame.
2. INSTALLATION
2.1 Reference Stan ar s
2.2 Siting the Appliance
Low pressure
pipes BS 6891 1988
Boilers of rated input
not exceeding 60 kW BS 6798 1987
Forced circulation hot
water system BS 5449 1990
Installation of gas hot water
supplies for domestic purposes
( 2nd family gases) BS 5546 1990
Flues BS 5440-1 1990
Air supply BS 5440-2 1989

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Legen :
A = Central Heating Flow (3/4”)
B = Domestic Hot Water Outlet (1/2”)
C = Gas Inlet (3/4”)
D = Domestic Cold Water Inlet (1/2”)
E = Central Heating Return (3/4”)
F = Cylinder Flow (3/4”)
G = Cylinder Return (3/4”)
2.3 Overall Dimensions
890
385
(A-B-D-E)
(C)
465
99 99
132 67 65
85
155
208
30
49
(F - G)
(A-D-E)
(C)
AF CDGE
GENUS 30 MFFI
GENUS 27 RFFI SYSTEM
In order to allow for access to the interior of the boiler for maintenance purposes, the
boiler must be installed in compliance with the clearance requirements indicated in the
diagram below.
400
300
450
60 60
110197
160
2.4 Clearances
min 300 - max 350
GENUS 30 MFFI GENUS 27 RFFI SYSTEM
Fig. 2.1
Fig. 2.2
002A
007A
008A
009A
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Fasten the boiler in place using the template and anchors supplied with the
unit. It is highly recommended that a spirit level be used to position the boiler so
that it is perfectly level.
For additional information, please consult the instructions contained in the con-
nection kit and the flue kit.
For safety purposes, have a competent person carefully check the electrical
system in the property, as the manufacturer will not be held liable for damage
caused by the failure to earth the appliance properly or by anomalies in the
supply of power. Make sure that the residential electrical system is adequate for
the maximum power absorbed by the unit, which is indicated on the rating plate.
In addition, check that the section of cabling is appropriate for the power
absorbed by the boiler.
The boiler operates with alternating current, as indicated in the technical data
table (1.2), where the maximum absorbed power is also indicated. Make sure
that the connections for the neutral and live wires correspond to the indications
in the diagram. The appliance electrical connections are situated on the reverse
of the control panel (see the servicing manual for further information)
2.5 Mounting the Appliance
2.6 Electrical Connection
Important!
In the event that the power supply cord must be changed, replace it with one
with the same specifications. Make the connections to the terminal board locat-
ed within the control panel, as follows:
- The yellow-green wire should be connected to the terminal marked with the
earth symbol; make sure to re-use the ferrule mounted on the other supply
cord;
- The blue wire should be connected to the terminal marked “N”;
- The brown wire should be connected to the terminal marked “L”.
Note: The diagrams for the electrical system are indicated in section 2.11.
Warning, this appliance must be earthed.
External wiring to the appliance must be carried out by a qualified technician
and be in accordance with the current I.E.E. Regulations and applicable local
regulations. The Genus range of boilers are supplied for connection to a 230 V~
50 Hz supply.
The supply must be fused at 3 A.
The method of connection to the electricity supply must facilitate complete elec-
trical isolation of the appliance, by the use of a fused double pole isolator hav-
ing a contact separation of at least 3 mm in all poles or alternatively, by means
of a 3 A fused three pin plug and unswitched shuttered socket outlet both
complying with BS 1363.
The point of connection to the Electricity supply must be readily accessible and
adjacent to the appliance unless the appliance is installed in a bathroom when
this must be sited outside the bathroom.
Fig. 2.3
2.7 Gas Connection The local gas region contractor connects the gas meter to the service pipe.
If the gas supply for the boiler serves other appliances ensure that an adequate
supply is available both to the boiler and the other appliances when they are in
use at the same time.
Pipe work must be of an adequate size. Pipes of a smaller size than the boiler
inlet connection should not be used.
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2.8 Water Connections
Legen
A = Central Heating Flow
B = Domestic Hot Water Outlet
C = Gas Inlet
D = Domestic Cold Water Inlet
E = Central Heating Return
F = Cylinder Flow
G = Cylinder Return
I = Safety Valve
Central Heating
Detailed recommendations are given in BS 6798:1987 and BS 5449-1:1990,
the following notes are given for general guidance.
Pipe Work:
Copper tubing to BS EN 1057:1996 is recommended for water pipes. Jointing
should be either with capillary soldered or compression fittings.
Where possible pipes should have a gradient to ensure air is carried naturally
to air release points and water flows naturally to drain taps.
The appliance has a built-in automatic air release valve, however it should be
ensured as far as possible that the appliance heat exchanger is not a natural
collecting point for air.
Except where providing useful heat, pipes should be insulated to prevent heat
loss and avoid freezing.
Particular attention should be paid to pipes passing through ventilated spaces
in roofs and under floors.
By-pass:
The appliance includes an automatic by-pass valve, which protects the main
heat exchanger in case of reduced or interrupted water circulation through
the heating system, due to the closing of thermostatic valves or cock-type
valves within the system.
System Design:
This boiler is suitable only for sealed systems.
Drain Cocks:
These must be located in accessible positions to permit the draining of the
whole system. The taps must be at least 15mm nominal size and
manufactured in accordance with BS 2870:1980.
Safety Valve Discharge:
The discharge should terminate facing downwards on the exterior of the
building in a position where discharging (possibly boiling water & steam) will
not create danger or nuisance, but in an easily visible position, and not cause
damage to electrical components and wiring.
The discharge must not be over an entrance or a window or any other type of
public access.
A
C
B D E
I
A
C
G
D E
I
F
GENUS 30 MFFI GENUS 27 RFFI SYSTEM
View of the Boiler Connections
Fig. 2.4
Fig. 2.5
Fitting the connection kit to the
Genus 27 RFFI System only.
It will be noted that the kit has two con-
nections not required for this boiler i.e.
the domestic cold inlet “E”and the
domestic hot water outlet “B”(see fig.
2.4).
Although the cold water main supply
must be connected to the isolation valve
for the purpose of operating the filling-
loop, the isolation valve is NOT connect-
ed to the boiler and should be left in the
OFF position.
The D.H.W. outlet is capped-off on the
boiler, therefore not requiring the isola-
tion valve to be used.
The Genus 27 RFFI System has 2 x 3/4"
B.S.P. male threads for the cylinder flow
and return. It is recommended that 2 x
22mm x 3/4" female iron fittings (not sup-
plied) be used on these connections
(using P.T.F.E. tape), before the boiler is
mounted on the wall.
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Resi ual Hea of the Boiler
27/30 kW
Air Release Points:
These must be fitted at all high points where air naturally collects and must
be sited to facilitate complete filling of the system.
The appliance has an integral sealed expansion vessel to accommodate the
increase of water value when the system is heated.
It can accept up to 7 l (1.5 gal) of expansion water. If the heating circuit has
an unusually high water content, calculate the total expansion and add an
additional sealed expansion vessel with adequate capacity.
Mains Water Feed - Central Heating:
There must be no direct connection to the mains water supply even through a
non-return valve, without the approval of the Local Water Authority.
Filling:
A temporary method for initially filling the system and replacing lost water
during servicing and initial filling (in accordance with Water Supply Byelaw
14), is provided as an intergal part of the connection kit (see fig. 2.5). The
flexible hose must be removed once the system has been filled. The D.H.W.
inlet valve on the connection kit has two postions, one for winter and one for
the summer. This enables the flow-rate through the appliance to be adjusted
so that a sensible D.H.W. temperature may be achieved throughout the year.
Domestic Water
The domestic water must be in accordance with the relevant recommendation
of BS 5546:1990. Copper tubing to BS EN 1057:1996 is recommended for
water carrying pipe work and must be used for pipe work carrying drinking
water.
2.9 Flue Connections Flue System
The provision for satisfactory flue termination must be made as described
in BS 5440-1.
The appliance must be installed so that the flue terminal is exposed to outdoor air.
The terminal must not discharge into another room or space such as an out-
house or lean-to.
It is important that the position of the terminal allows a free passage of air
across it at all times.
The terminal should be located with due regard for the damage or discoloura-
tion that might occur on buildings in the vicinity.
In cold or humid weather water vapour may condense on leaving the flue termi-
nal.
The effect of such “steaming”must be considered.
If the terminal is less than 2 metres above a balcony, above ground or above a
flat roof to which people have access, then a suitable terminal guard must be
fitted. When ordering a terminal guard, quote the appliance model number.
015A