Ariston microSYSTEM 21 RFFI User manual

Installation
Instructions
Type C Boilers
G.C.N: 41-116-06
41-116-07
LEAVE THESE INSTRUCTIONS
WITH THE END-USER
Country of destination: GB/IE

2
TABLE OF CONTENTS 1. GENERAL INFORMATION
1.1 GENERAL INSTRUCTIONS
1.2 OVERALL VIEW
2. INSTALLATION
2.1 DELIVERY
2.2 REFERENCE STANDARDS
2.3 SITING THE APPLIANCE
2.4 OVERALL DIMENSIONS
2.5 CLEARANCES
2.6 MOUNTING THE APPLIANCE
2.7 ELECTRICAL CONNECTION
2.8 GAS CONNECTION
2.9 WATER CONNECTIONS
2.10 FLUE CONNECTION
2.11 ROOM THERMOSTAT CONNECTION
2.12 ELECTRICAL DIAGRAMS
2.13 GAS AND WATER CIRCUITS
3. D.H.W. STORAGE CYLINDER
3.1 2 PORT AND 3 PORT VALVE INSTALLATIONS
3.2 DOMESTIC HOT WATER PRIORITY KIT
4. COMMISSIONING
4.1 INITIAL PREPARATION
4.2 CONTROL PANEL
4.3 REMOVING THE FRONT PANEL
4.4 INITIAL START UP
4.5 OPERATIONAL ADJUSTMENTS
4.6 COMBUSTION ANALYSIS
4.7 FUME DISCHARGE MONITORING
4.8 DRAINING THE SYSTEM
5. GAS ADJUSTMENTS
GAS ADJUSTMENT TABLE
5.1 CHANGING THE TYPE OF GAS
6. MAINTENANCE
7. TECHNICAL INFORMATION

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 installation, 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 an appliance for the production of central heating (C.H.).
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
negligent 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 in section 7 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 (at or adjacent to 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 carrying out
maintenance.
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.
Check the following at least once a year:
1 - Check the seals for the water connections; replace any faulty seals.
2 - Check the gas seals; replace any faulty gas seals.
3 - Visual check of the entire unit.
1. GENERAL
INFORMATION
User’s
Manual
3
1.1 GENERAL INSTRUCTIONS

4
4 - Visual check of the combustion process or analysis of combustion by-
products (see section 4.5) and cleaning of the burner if needed.
5 - If called for by point. 3, dismantling and cleaning of the combustion
chamber.
6 - If called for by point. 4, dismantling and cleaning of the burner jets.
7 - Visual check of the primary heat exchanger:
- check for overheating in the blade assembly;
- clean the exhaust fan if needed.
8 - Adjustment of the flow rate of the gas: flow rate for lighting, partial load
and full load.
9 - Check of the heating safety systems:
- safety device for maximum temperature (overheat thermostat);
- safety device for maximum pressure (safety valve).
10- Check of the gas safety systems:
- safety device for lack of gas or flame ionisation (detection
electrode);
- safety device for gas cock.
11- Check of the electrical connection (make sure it complies with the
instructions in the manual).
12- General check of the combustion by-products of the
discharge/ventilation system.
13- Check of the general performance of the unit.
LEGEND:
1. Flue connector
2. Air intake for twin pipe flue systems
3. Fan
4. Combustion chamber hood
5. Main heat exchanger
6. Safety thermostat
7. Combustion chamber
8. Combustion chamber insulation panel
9. Detection electrode
10. Ignition electrodes
11. Burner
12. Regulation thermostat
13. Frost thermostat
14. Pump pressure switch
15. Safety valve (3 bar)
16. Automatic By-pass
17. Gas valve
18. Spark generator
19. Boiler drain valve
20. Circulation pump with automatic air release valve
21. Expansion vessel
22. Air pressure take-off point
23. Air pressure switch
24. Combustion analysis points
1.2 OVERALL VIEW
FIG. 1.0

5
The technical information and instructions provided herein below are
intended for the installer / Servicing Technician so that the unit may be
installed and serviced correctly and safely.
There will be two items:
1 - The fully assembled boiler
2 - A separately boxed connection ki
WATER REGULATIONS
In GB it is necessary to comply with the Water Supply (Water Fittings)
Regulations 1999, for Scotland, The Water Bylaws 2000, Scotland. The Genus
30 Plus is an approved product under the Water Regulations.
To comply with the Water Regulations, you attention is drawn to The Water
Regulations guide published by the Water Regulations Advisory Scheme
(WRAS) gives full details of the requirements.
In IE, the requirements given in the current edition of I.S.813 and the current
Building Regulations must be followed.
The installation of this appliance must be in accordance with the relevant
requirements of the Local Building Regulations, the current I.E.E. Wiring
Regulations, the bylaws of the local water authority, in Scotland, in
accordance with the Building Standards (Scotland) Regulation and Health
and Safety document No. 635 “Electricity at work regulations 1989” and in
the Republic of Ireland with the current edition of I.S. 813, the Local Building
Regulations (IE).
C.O.S.H.H.
Materials used in the manufacture of this appliance are non-hazardous and
no special precautions are required when servicing.
Installation should also comply with the following British Standard Codes of
Practice:
and in the Republic of Ireland in accordance with the following Codes of
Practice:
2.2 REFERENCE STANDARDS
2.1 DELIVERY
2. INSTALLATION
BS 7593 Treatment of water in domestic hot water central heating
systems
BS 5546 Installation of hot water supplies for domestic purposes
BS 5440-1 Flues
BS 5440-2 Air supply
BS 5449 Forced circulation hot water systems
BS 6798 Installation of gas fired hot water boilers of rated input not
exceeding 60kW
BS 6891 Installation of low pressure gas pipe up to 28mm
BS 7671 IEE wiring regulations
BS 7074 Specification for expansion vessels
BS 5482 Installation of L.P.G.
I.S. 813 Domestic Gas Installations
The following BS Standards give valuable information;
BS 5546 Installation of hot water supplies for domestic purposes
BS 5449 Forced circulation hot water systems
BS 7074 Specification for expansion vessels
BS 7593 Treatment of water in domestic hot water central heating
systems

6
WARNING!!
The addition of anything that may interfere with the normal operation of the
appliance without express written permission of the manufacturer or his
agent could invalidate the warranty. In GB this could also infringe the GAS
SAFETY(Installation and Use) REGULATIONS.
In the Republic of Ireland the installation and initial start up of the appliance
must be carried out by a Competent Person in accordance with the current
edition of I.S.813 “Domestic Gas Installations”, the current Building
Regulations, reference should also be made to the current ETCI rules for
electrical installation.
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, in Scotland, the electrical provisions of the Building
Regulations applicable in Scotland, and in the Republic of Ireland, the
current edition of I.S.813, with respect to the installation of the combined
appliance in a room containing a bath or shower. The location of the boiler in
a room containing a bath or shower should only be considered if there is no
alternative.
Where a room-sealed appliance is installed in a room containing a bath
or shower reference should be made to the relevant requirements.
In GB this is the current I.E.E. WIRING REGULATIONS and BUILDING
REGULATIONS. In IE reference should be made to the current edition
of I.S.813 and the current ETCI rules.
If the boiler is to be sited into a timber framed building, reference must be
made to the current edition of the Institution of Gas Engineers Publication
IGE/UP/7 (Gas Installations in Timber Framed Housing).
The location must permit adequate space for servicing and air circulation
around the appliance as indicated in Section 2.5.
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 the
installation within a cupboard.
This appliance is not suitable for outdoor installation.
The type C appliances (in which the combustion circuit, air vent intake
and combustion chamber are air-tight with respect to the room in
which the appliance is installed) can be installed in any type of room.
Secondary ventilation is not required with this boiler. The boiler must be
installed on a solid, non-combustible, permanent wall to prevent access from
the rear.
2.3 SITING THE APPLIANCE

7
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 information table in section 7, 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 under the inspection cover
(see the servicing manual for further information)
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 located within the
control panel, as follows:
- The yellow-green wire should be connected to the
terminal marked with the “”symbol;
- The blue wire should be connected to the terminal
marked “N”;
- The brown wire should be connected to the terminal
E
L
N
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 connection kit and the flue kit.
2.7 ELECTRICAL CONNECTION
2.6 MOUNTING THE APPLIANCE
132 132
CE
400 mm
300 mm
60 mm
450 mm
LEGEND:
A= Central Heating Flow (3/4”)
C= Gas Inlet (3/4”)
E= Central Heating Return (3/4”)
mm = Clearances
2.4 OVERALL DIMENSIONS
2.5 CLEARANCES
FIG. 2.1
FIG. 2.2
In order to allow for access to the interior of the boiler for
maintenance purposes, the boiler must be installed in
compliance with the minimum clearances indicated in FIG. 2.1

8
VIEW OF THE BOILER CONNECTIONS
LEGEND:
A= Central Heating Flow
C= Gas Inlet
E= Central Heating Return
F= Safety Valve
G= Pump transportation screw
(remove before igniting the boiler)
H= Automatic By-pass pipe
2.9 WATER CONNECTIONS
2.8 GAS CONNECTION The local gas region contractor connects the gas meter to the service pipe.
The gas installation should be in accordance with the relevant standards. In
GB this is BS6891 and in IE this is the current edition of I.S.813. The
connection the the appliance is a 22mm copper tail located at the rear of the
gas service cock (FIG. 2.3). 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.
marked “L”.
Note: The diagrams for the electrical system are indicated in section 2.12.
Warning, this appliance must be earthed.
External wiring must be correctly earthed, polarised and in accordance with
relevant regulations / rules. In GB this is the current I.E.E. WIRING
REGULATIONS. In IE reference should be made to the current edition of the
ETCI rules. This boiler is supplied for connection to a 220 - 240 V~ 50 Hz
supply.
The supply must be fused at 3 A.
The method of connection to the electricity supply must facilitate complete
electrical isolation of the appliance, by the use of a fused double pole
isolator having 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 (see section 2.3).
FIG.2.3
FIG. 2.4
H
A
F
CE
G
SC004A

9
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 an
manufactured in accordance with BS 2870:1980.
SAFETY VALVE DISCHARGE (PRIMARYWATER)
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.
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, and must be in accordance with water supply regulations. Your
attention is drawn to, for GB: Guidance G24.2 and recommendation
R24.2 of the water regulations guide and for IE: the current edition of
I.S.813.
FILLING
A temporary method for initially filling the system and replacing lost water
during servicing and initial filling (complying to current water regulations
and byelaws) is provided. The flexible hose must be removed once the
system has been filled.
RESIDUAL HEAD OF THE BOILER

10
Ø 60/100 mm
FIG.2.6
The boiler is designed to be connected to a coaxial flue discharge system.
2.10 FLUE CONNECTIONS FLUE SYSTEM
The provision for satisfactory flue termination must be made as described in
BS 5440-1, for IE recommendations I.S.813.
The appliance must be installed so that the flue terminal is exposed to
outdoor air, consideration must be given to terminal discharges onto a
pathway or passageway, check that the combustion discharges will not
cause a nuisance and that the terminal will not obstruct the passageway.
The terminal must not discharge into another room or space such as an
outhouse or lean-to.
It is important that the position of the terminal allows a free passage of air
across it at all times.
If the terminal is fitted within 1 metre of a plastic gutter, within 500mm of a
painted eave or a painted gutter, an aluminium shield of at least 1 metre
long should be fitted to the underside of the gutter or painted surface. An air
space of 5mm should be left between shield and gutter.
The terminal should be located with due regard for the damage or
discolouration that might occur on buildings in the vicinity.
In cold or humid weather water vapour may condense on leaving the flue
terminal. 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.
A suitable terminal guard is available from:
TOWER FLUE COMPONENTS
Morley Road
Tonbridge
Kent TN9 1RA
The minimum acceptable spacing from the terminal to obstructions and
ventilation openings are specified in FIG. 2.5.
T ERMINAL P OSITION mm
A - Directly above or below an openable window
or other opening 300
B - Below gutters, solid pipes or drain pipes 75
C - Below eaves 200
D - Below balconies or car-port roof 200
E - From vertical drain pipes and soil pipes 150
F - From internal or external corners 300
G - Above ground or balcony level 300
H - From a surface facing a terminal 600
I - From a terminal facing a terminal 1200
J - From an opening in the car port
(e.g. door, window) into dwelling 1200
K - Vertically from a terminal in the same wall 1500
L - Horizontally from a terminal in the same wall 300
M - Horizontally from an opening window 300
N - Fixed by vertical flue terminal
FIG. 2.5

Ø 80 mm
In addition, it is also possible to use a split (twin pipe)
system by fitting a special adaptor to the flue connector
and using the aperture for the air vent intake located on
the top part of the combustion chamber.
To utilise the air intake it is necessary to:
1. Remove the bottom of the air intake by cutting it with a
suitable knife (see FIG. 2.7);
2. Insert the elbow into the air intake until it reaches the
lower end. (There is no need to use gaskets or sealing
compounds).
11
IMPORTANT!
For all flue systems, a restrictor
must always be inserted into the
boiler’s flue connector; the
restrictor must be Ø 46 or Ø 41 in
diameter depending on the length
of piping indicated in TABLE 2.1.
FIG 2.9 and FIG 2.10 illustrate some
of the various designs for coaxial or
twin pipe flue systems.
For further information on
discharge/ventilation accessories,
see the FLUE PIPE ACCESSORIES
MANUAL.
COAXIAL SYSTEMS
FIG. 2.7
FIG. 2.8
FIG. 2.9

L = Sum of the total length of exhaust + air intake piping.
12
Exhaust
Type
C12 (xx)
C32 (xx)
C42 (xx)
Restrictor
ø 46 mm
L min = 0.5 m
L max = 1 m
Maximum
Extension
Exhaust/Air
L = 4 m
Risk of Condensation Forming
Coaxial
Systems
ø 60/100
Piping not insulated
ø 46 restrictor NO restrictor
NONE NONE
Piping insulated
ø 46 restrictor NO restrictor
NONE NONE
Exhaust
Type
C12 (xx)
C32 (xx)
C42 (xx)
Restrictor
ø 41 mm
L min = 0.5 m
L max = 1 m
Maximum
Extension
Exhaust/Air
L = 4 m
Risk of Condensation Forming
Coaxial
Systems
ø 60/100
Piping not insulated
ø 41 restrictor NO restrictor
NONE NONE
Piping insulated
ø 41 restrictor NO restrictor
NONE NONE
TABLE 2.1
Exhaust
Type
C12 (xy)
C32 (xy)
C42 (xy)
C52 (xy)
C82 (xy)
Restrictor
ø 41 mm
L max = 38 m
L max = 34 m
Maximum
Extension
Exhaust/Air
62 m
62 m
62 m
54 m
Risk of Condensation Forming
Twin Pipe
Systems
ø 80/80
Piping not insulated
ø 41 restrictor NO restrictor
8 m 11 m
8 m 11 m
Piping insulated
ø 41 restrictor NO restrictor
19 m 31 m
19 m 31 m
21 RFFI
28 RFFI
Exhaust
Type
C12 (xy)
C32 (xy)
C42 (xy)
C52 (xy)
C82 (xy)
Restrictor
ø 46 mm
L max = 25 m
L max = 22 m
Maximum
Extension
Exhaust/Air
34 m
34 m
34 m
31 m
Risk of Condensation Forming
Twin Pipe
Systems
ø 80/80
Piping not insulated
ø 46 restrictor NO restrictor
3.0 m 4.5 m
3.3 m 4.8 m
Piping insulated
ø 46 restrictor NO restrictor
12.5 m 16.0 m
14.0 m 17.8 m
21 RFFI
28 RFFI
TWIN PIPE
SYSTEMS
FIG.2.10
In calculating the lengths of the pipes, the
maximum length “L” must also take into
consideration the values for the
exhaust/air intake end terminals, as well
as 90°elbows for coaxial systems.
The C52 types must comply with the
following requirements:
1 - The exhaust/ air intake pipes must
have the same diameter of ø80 mm.
2 - If elbows are to be inserted into the
air intake and/or exhaust system, the
calculation of the overall length must
take into consideration the values for
each elbow, see the FLUE PIPE
ACCESSORIES MANUAL.
3 - The exhaust pipe must protrude by at
least 0.5 m above the top of the roof
in the event that it is located on the
opposite side of the building to the
side with the air intake (this condition
is not obligatory when the air intake
and exhaust are located on the same
side of the building).

13
To connect a room thermostat and/or time clock, it is necessary to:
1. - Open the control panel as indicated in section 4.3;
2.- Remove screws “A” and remove the inspection cover from the reverse of the control
panel;
3. - For the room-thermostat connect the thermostat switching wires to the position 5 and
6 and remove the wire link (for three-wire thermostats connect the neutral to terminal
N);
4. - For the time clock connect the clock switching wires to the positions 3 and 4 and
connect the clock motor electrical supply to the terminals marked Land N.
Note: A frost thermostat is built-in to the appliance.
For connection to control systems with zone valves for hot water cylinders
see section 3.
2.11 ROOM THERMOSTAT
CONNECTION
A

2.12 ELECTRICAL DIAGRAM
14
FIG. 2.12
LEGEND:
A - On/Off Switch
B - On/Off L.E.D.
C - Heating Switch
D - Heating L.E.D.
E - Reset Button
F - Ignition Failure (Lockout) L.E.D.
A01 - Pump Pressure Switch
A02 - Frost Thermostat
A03 - Modulator
A04 - Circulation Pump
A05 - Regulation Thermostat
A06 - External Control System
A07 - Time Clock Connector
A08 - External (Room) Thermostat
A09 - Air Pressure Switch
A10 - Fan
A11 - Overheat Thermostat
A12 - Spark Generator/Gas Valve Supply
A13 - Detection Electrode
Colours:
Wh -White
Bl -Blue
Gry -Grey
Brn -Brown
Blk -Black
Rd -Red
Grn/Yll -Yellow/Green

15
1
2
3
4
5
6
7
8
9
10
11 12
13
14
15
16
17
LEGEND:
1. Fan
2. Main heat exchanger
3. Overheat thermostat
4. Burner
5. Ignition electrodes
6. Detection electrode
7. Regulation thermostat
8. Frost thermostat
9. Gas valve
10. Pump pressure switch
11. Safety valve (3 bar)
12. Boiler drain valve
13. Automatic by-pass
14. Pressure gauge
15. Circulation pump with automatic
air release valve
16. Expansion vessel
17. Air pressure switch
A. Central Heating Flow
C. Inlet Gas
E. Central Heating Return
2.13 GAS AND WATER CIRCUITS
FIG.2.14
FIG. 2.13

16
3. D.H.W. STORAGE
CYLINDER
The microSYSTEM can be connected to a storage cylinder (both open-vented and
unvented) for the production of domestic hot water (D.H.W.). Cylinders of different
capacities can be used depending on site requirements (see TABLE 3.1 for a
selection of ARISTON unvented cylinders).
FIG. 3.2
3 port valve installation
FIG. 3.1
2 port valve installation
3.1 2 PORT AND 3 PORT VALVE
INSTALLATIONS
Wiring to 2 port valve installation
using an external 2 channel
programmer
Type Danfoss FP715
Type Honeywell ST6400C
FIG. 3.3

17
Technical Data Capacity Coil C.H.W. D.H.W. Max Heating Heat Ioss
Surface Flow/rate Flow/rate Output
MODEL It. m
2
m
3
/h It/h kW kWh/24h
Contract STI 125 Indirect 125 0.75 0.5 194 11.3 2
1 266 15.5
2 340 19.8
Comfort STI 125 Indirect 125 0.75 0.5 256 14.9 2.2
Contract STI 150 Indirect 150 0.93 1 353 20.5
2 451 26.2
Comfort STI 150 Indirect 150 0.93 0.5 256 14.9 2.4
Contract STI 210 indirect 200 0.93 1 353 20.5
2 451 26.2
Comfort STI 210 Indirect 200 0.93 0.5 256 14.9 2.9
Contract STI 300 Indirect 300 0.93 1 353 20.5
2 451 26.2
SB 125 Indirect 125 1 0.5 190 11 1.72
1 318 18.5
2 496 28.8
SB 150 Indirect 150 1 0.5 190 11 1.75
1 318 18.5
2 496 28.8
SB 200 Indirect 200 1.3 0.5 190 11 2.1
1318 18.5
2 496 28.8
TABLE 3.1
Wiring to 3 port valve installation
using an external 2 channel
programmer
Type Danfoss FP715
Type Honeywell ST6400C
FIG.3.4 NOTE:When using a 3 port valve installation in conjunction with an unvented cylinder it
will be necessary to use a 2 port valve on the cylinder flow connection in addition
to the 3- port valve to satisfy Building Regulations.

18
MTS support the initiative. Within the information pack you will find
a copy of the Log Book. It is important that this is completed in the
presence of your customer, they are shown how to use it, and it is signed by
them. Please instruct your customer that they must have their Log
Book with them whenever they contact a service engineer or us.
Preliminary electrical system checks to ensure electrical safety must be
carried out by a competent person i.e. polarity, earth continuity, resistance to
earth and short circuit.
FILLING THE HEATING SYSTEM:
Remove the panels of the case and lower the control panel (see section
3.3 for further information).
Open the central heating flow and return cocks supplied with the
connection kit (there are two isolation points on the return connection).
Unscrew the cap on the automatic air release valve one full turn and leave
open permanently.
Close all air release valves on the central heating system.
Gradually open valve(s) at the filling point (filling-loop) connection to the
central heating system until water is heard to flow, do not open fully.
Open each air release tap starting with the lowest point and close it only
when clear water, free of air, is visible.
Purge the air from the pump by unscrewing anticlockwise and
removing the pump plug and also manually rotate the pump shaft in
the direction indicated by the pump label to ensure the pump is free.
Refit the pump plug.
Continue filling the system until at least 1.5 bar registers on the pressure
gauge.
Inspect the system for water leaks and remedy any leaks discovered.
GAS SUPPLY:
Inspect the entire installation including the gas meter and test for
soundness. The gas installation should be in accordance with the relevant
standards.In GB this is BS6891 and in IE this is the current edition of
I.S.813.
4. COMMISSIONING
4.1 INITIAL PREPARATION
Boiler microSYSTEM microSYSTEM
21 RFFI 28 RFFI
Cylinder
= Ideal
= Possible
The microSYSTEM is able to be connected to a specially designed
kit for the management of D.H.W. production. This kit gives priority to
production of D.H.W. unlike traditional systems where the boiler
power is split between C.H. and D.H.W. This generally enables a
smaller storage cylinder to be chosen as the boiler’s full output will be
channelled into the cylinder allowing for a quick heat-up.
The kit (ARISTON part number 706329) can be obtained from an
ARISTON supplier.
The kit consits of:
1) Electronic module able to plug into the boiler’s P.C.B;
2) 3-way priority valve with actuator for connection to the boiler’s
flow outlet;
3) A limit thermostat (80˚C) to check the water temperature of the
heating flow to the cylinder, to be installed within the boiler;
4) Pipes and accessories.
Contract STI 125 Indirect
Comfort STI 125 Indirect
Contract STI 150 Indirect
Comfort STI 150 Indirect
Contract STI 210 Indirect
Comfort STI 210 Indirect
Contract STI 300 Indirect
SB 125 Indirect
SB 150 Indirect
SB 200 Indirect
TABLE 3.2
3.2 DOMESTIC HOT WATER
PRIORITY KIT

In order to access the inside of the boiler, it is necessary to
unscrew the fastening screws “A” of the control panel
located on the lower part of the panel itself.
The control panel moves downward and when pulled
forward rotates on two lateral hinges.
The panel stays in a semi-horizontal position, which allows
access to the inner parts of the boiler.
In order to increase the manoeuvring space, it is possible
to raise the control panel and rotate it to a fully horizontal
position.
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4.3 REMOVING THE
FRONT PANEL
1
A
A
B
C
D
E
F
IL
GH
LEGEND:
A-On/Off button
B- On/Off L.E.D. green (frost protection active)
C- Central Heating button
D- Cental Heating active L.E.D. green
E- Ignition failure (lockout) and/or overheat reset button
F- Ignition failure (lockout) and/or overheat L.E.D. red
G- Central heating temperature adjustment
H- Energy Saving System (ESS)
I- Knock-out for time clock
J- Heating system pressure gauge
4.2 CONTROL PANEL
FIG. 4.1
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 less than the 22mm should
not be used.
Open the gas cock (supplied with the connection kit) to the appliance and
check the gas connections on the appliance for leaks.
When the installation and filling are completed, flush the system while cold,
refill, turn on the Central Heating system (Section 4.4) and run it until the
temperature has reached the boiler operating temperature.
The system must then be immediately flushed through.
The flushing procedure must be in line with BS 7593:1992 code of practice
for treatment of water in domestic hot water central heating systems.
During this operation, we highly recommend the use of a central heating
flushing detergent (Fernox Superfloc or equivalent), whose function is to
dissolve any foreign matter that may be in the system.
Substances different from these could create serious problems to the
pump or other components.
The use of an inhibitor in the system such as Fernox MB-1 or equivalent is
strongly recommended to prevent corrosion (sludge) damaging the boiler and
system.
Failure to carry out this procedure may invalidate the appliance
warranty.
For IE it is necessary to complete a “Declaration of Conformity” to indicate
compliance to I.S.813. An example of this is given in the current edition of
I.S.813. In addition it is necessary to complete the “Benchmark” Log Book.

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4.4 INITIAL START-UP THE CHECKS TO BE RUN BEFORE INITIAL START-UP ARE AS FOLLOWS:
1. Make sure that:
-the screw on the automatic air valve has been loosened when the
system is full;
- If the water pressure in the system is below 1.5 bar, bring it up to the
appropriate level;
-Ensure that the gas cock is closed;
- Make sure that the electrical connection has been made properly and
that the earth wire is connected to an efficient earthing system;
-Supply power to the boiler by pushing the On/Off button “A” (see
FIG.4.1) - the L.E.D. “B” will illuminate. Then push the button “C” in for
central heating - the L.E.D. “D” will illuminate. This will start the
circulation pump.After 7 seconds, the boiler will signal a shutdown due
to ignition failure. Leave the boiler as it is until all of the air has been bled
from the system.
- Loosen the cap on the head of the pump to eliminate any air pockets;
- Repeat the procedure for bleeding the radiators of air;
- Check the system pressure and, if it has dropped, open the filling loop
again to bring the pressure back up to 1.5 bar.
2. Make sure that all gate valves are open;
3. Turn on the gas cock and check the seals on the connections with an
approved soap solution and eliminate any leaks.
4. Press the reset button “E” for the lighting system; the spark will light the
main burner. If the burner does not light the first time, repeat the
procedure.
5. Check the minimum and maximum pressure values for the gas going to
the burner; adjust it if needed using the values indicated in the table in
section 5 (See the relative section for burner pressure adjustment within
the servicing manual).
B
45
To dismantle the front casing panel it is necessary to:
1 - Remove the two screws “B”;
2 - Move the front casing panel up and lift forward.
23