Protherm 23 BTVE Manual

6187
Wall hung combination boiler
User, Installation
and Servicing Instructions
PROTHERM 23 BTVE

1
PROVITHERM 23 BTVE
PROVITHERM 23 BTVE
The boiler serial number is marked on the label attached to the inside of the drop down
door. Refer to the ‚Introduction‘ section for a description of the basic functions
of the boiler. The ‚Users‘ section describes how to safely operate the boiler.
Instructions for Use
Introduction .......................................................................................................................... 2
Control and signalling ........................................................................................................... 3
Boiler Start and Switch-Off .................................................................................................. 4
Warranty conditions.............................................................................................................. 4
Instructions for Installation and Servicing
Introduction .......................................................................................................................... 5
Dimensions and pressure available ...................................................................................... 6
Technical parameters ........................................................................................................... 7
Boiler schematic .................................................................................................................. 8
Terminal position .................................................................................................................. 9
Heating and hot water design .............................................................................................. 10
Boiler installation................................................................................................................. 12
Flue gas and air ducts......................................................................................................... 13
Electrical part ..................................................................................................................... 16
Commencing boiler operation .............................................................................................. 17
Safety devices .................................................................................................................... 19
Cleaning and inspections .................................................................................................... 20
Replacement of boiler parts ............................................................................................... 24
Electrical diagrams ............................................................................................................ 33
Defects .............................................................................................................................. 34
Mandatory warning for CEE countries
Warning: This appliance is designed, approved and inspected to meet the requirements of the market.The identi-
fication plate located on the inside of the appliance certifies the origin where the product was manufactured and
the country for which it is intended.
If you see any exception to this rule, please contact your nearest dealer.
Thank you in advance for your assistance.
CE Mark
This boiler meets the requirements of Statutory Instrument No. 3083 The boiler (Efficiency) Regulations, and
therefore is deemed to meet the requirements of Directive 92/42/EEC on the efficiency requirements for new hot
water boilers fired with liquid or gaseous fuels.
Type test for purposes of Regulation 5 certified by: Notified body 0063.
Product/production certified by: Notified body 0063.
The CE mark on this appliance shows compliance with:
1. Directive 90/396/EEC on the approximation of the laws of the Member States relating to appliances burning
gaseous fuels.
2. Directive 73/23/EEC on the harmonization of the Laws of the Member States relating to the electrical equip-
ment designed for use within certain voltage limits.
3. Directive 89/336/EEC on the approximation of the Laws of the Member States relating to electromagnetic com-
patibility.

2PROVITHERM 23 BTVE
Dear Customer,
You have become an owner of a wall-hung combination boiler. The boiler PROVITHERM 23 BTVE with forced
flue gas removal is designed for heating up the central heating water (CH) in central-heating systems in flats, family
houses, workshops, offices, etc. and as a flow heater of domestic hot water (DHW). We believe it will serve you
to your full satisfaction – certain minimum requirements must be fulfilled to that end. That is why we are asking
you to study and follow these instructions carefully.
Please, keep the following rules in mind:
• The boiler and all accessories must be installed and used in compliance with the design, the applicable laws,
technical regulations and the manufacturer’s instructions.
• The boiler can only be installed in the type of environment for which it is designed.
• Only service centres authorised by the manufacturer are allowed to put the boiler into operation after installation.
• In case of defects, call a service centre authorised by the manufacturer – incompetent intervention can damage
the boiler (and/or the accessories)!
• The service centre’s employee who initiates the boiler operation after installation shall instruct the user about the
boiler, its parts and operation.
• Check completeness of the delivery.
• Check to make sure the supplied boiler type complies with the expected manner of use.
• If you feel uncertain about any activities related to the boiler operation, look up and study all relevant information
in these instructions, and follow the recommended procedure.
• Do not remove or damage any labels or markings on the boiler.
• When the life cycle of the boiler, or its parts, has expired, they should be disposed of in an environmentally
friendly manner.
In practice, situations may occur in which the users must apply necessary precautions:
• Preventing the boiler from switching on (also accidental) when inspecting the flue-gas duct, water and gas piping
– i.e., electricity supply to the boiler must be stopped (e.g., by unplugging) in addition to using the boiler switch;
• Stopping the boiler whenever flammable or explosive vapours appear (even if temporarily) – such as vapours of
flooring glue, paints when surface finishing, gas leaks, etc.);
• If it is necessary to discharge water from the heating system, it must not be dangerously hot;
• If water has leaked from the boiler exchanger, or if the exchanger is filled with ice, no attempts to start the boiler
should be made until normal operating conditions prevail;
• If there is a (whether confirmed or suspected) gas leak or stoppage in the gas supply, switching off the boiler,
shutting down the gas supply and calling gasworks or a specialised service centre.
Safety of life and property:
• Boilers as products are checked for compliance with the following documents: EN 483, EN 437, EN 625, EN 50
165, EN 60 335-1:1997.
• The installation of this boiler must be carried out by a competent person in accordance with the relevant require-
ments of the current issue of:
The Gas Safety (Installation and Use) Regulations
The Building Regulations
The local water company Bylaws
The Building Standards Regulations
The Health and Safety at Work Act
• Besides the requirements as expressed in the above-cited documents, these Instructions for Use and the boiler
documentation provided by the manufacturer are to be followed. During use, no children, drug-intoxicated or
legally irresponsible persons should be allowed to tamper with the boiler.
Abbreviations used: CH – central heating water, DHW – domestic hot water.

3
PROVITHERM 23 BTVE
USER INSTRUCTIONS
Control and Signalling
Your Provitherm 23 BTVE boiler has been factory configured to operate at the heart of an existing installation.
However, because many installations are specially designed, do not hesitate to contact your installer who will be
able to ensure that you get the best performance from your installation, by adjusting the heating circuit’s max-
imum output or temperature. Once these settings have been made, you can still adjust the temperature to suit
your needs.
Central heating adjustment
The selector switch enables you to vary the temperature of the water in the central heating circuit from the
minimum setting (approx. 38°C) up to the maximum temperature set by your installer. Most of the time, the mid
position will meet your needs but the selector should be moved nearer to the maximum setting in very cold
weather when your home is not reaching the required temperature.
1 - On/Off switch
2 - Central heating temperature selector
3 - Domestic hot water temperature selector
4 - Pressure gauge (bar) and temperature gauge (°C)
5 - Fault display (faults indicated by a red flashing light)
Control Panel
Domestic hot water
The selector switch can be adjusted from a temperature of (approx. 35°C up to 60°C or more).The ECO setting
is ideally suited for all the requirements of normal family use (showers, washing up etc.). The maximum setting
should be reserved for occasional use when very hot water is required.
Protection against freezing
The boiler has a built in frost protection programme as long as the electricity and gas are left switched on. If the
temperature within the appliance falls to 4°C the burner and system pump are activated.When the temperature
inside the appliance reaches 8°C the burner will shut down and after a short period the pump will stop. This
device primarily protects the boiler. Any other exposed areas of the system should be protected by a seperate
frost thermostat.
If the boiler is to be out of use for any long periods during severe weather conditions, it is recommended that the
whole system, including the boiler, be drained to avoid the risk of freezing.
If in doubt, consult your servicing company.
Draining and filling
Caution:The boiler is installed as part of a sealed system which must only be drained and filled by a competent
person.
Diagram 1

4PROVITHERM 23 BTVE
BOILER START AND SWITCH-OFF
The preparation for and commencing of the boiler operation may only be carried out by a specialised service
centre!
Before starting the boiler when it has been put into operation, check the following facts:
– The power cord must be plugged into the socket.
– The gas valve that feeds the boiler must be open.
– The water pressure in the heating system should be between 1 and 2 bar.
Now the boiler is ready to be started.
Lighting the boiler:
Make sure that:
• The boiler is connected to the electrical supply.
• The gas service cock is open. Turn the switch ON ( I )
Stop the boiler :
• Turn the switch OFF ( 0 ) the electrical supply is OFF.
• Turn the gas supply OFF at the gas service cock if the boiler is to be out
of use for a long time.
Domestic hot water adjustment :
•Position ( 0 ): Domestic hot water OFF
•Position ( I ) and ECO: Domestic hot water between approx. 35°C and 50°C
•ECO: Maximum recommended for constant use
•Between ECO and maxi: Occasional use for water above approx. 50°C
Heating temperature adjustment :
•Winter: Set the control knob between 1 and 5
•Summer: Set the control knob to
If a fault occurs (indicated by red flashing light) :
•Reset boiler: Turn the On/Off switch to ( 0 ), wait for five seconds.
Turn the On/Off switch to ( I ) the boiler is reset. If the fault continues
call your Installation/Servicing company.
Maintenance and inspections
Checks and maintenance on the boiler should be regular, at least once a year. Such inspections are not covered
by the warranty. The Service Booklet contains a checklist for such inspections.
Cleaning
The boiler can be cleaned with a wet cloth and then dried and polished with a dry cloth. Never use any abrasives
or thinners.
WARRANTY CONDITIONS
The warranty on PROVITHERM 23 BTVE boilers is provided as specified in the Guarantee Certificate, Service
Booklet and under conditions specified in these Instructions for Use and Instructions for Installation (in chapters
Introduction, Boiler installation).

5
PROVITHERM 23 BTVE
INSTALLATION INSTRUCTIONS
Introduction
The Provitherm 23 BTVE boiler is a wall mounted modulating combination boiler with electronic ignition providing
central heating and instantaneous hot water.
The boiler is of the I2H category for use with Natural Gas (G20). The boiler has a fan assisted balanced flue which
both discharges the products of combustion to and draws the combustion air from the outside of the room. The
boiler is suitable for top outlet flue connection only but can be fitted with horizontal flue, vertical flue or twin-
pipe flue. Refer to flue options guide for further information, this is available from your nearest stockist. Both
the central heating and domestic hot water temperature are user adjustable from the boiler control panel. Domestic
hot water demand always has priority over heating demand. The pump, expansion vessel and associated safety
devices are all fitted within the boiler. The boiler can be installed against either an external wall or on an adjacent
inside wall, that is, the flue system will pass directly to the rear or to either side to the terminal fitted on the
outside wall face. The installation must be carried out by a qualified registered person in accordance with the
relevant requirements of The Building Regulations, The Water Byelaws, The Building Standards Regulations and
any applicable local regulations. These instructions should be carefully followed for the safe and economical
use of your boiler.
Electrical Supply
WARNING: This boiler must be earthed.
All system components shall be of an approved type and shall be connected in accordance with the current
issue of appropriate norm and any applicable local regulations. All external wiring between the appliance and the
electrical supply and earthing requirements shall comply with the current IEE Regulations.
Connection of the boiler and system controls to the mains supply must be through a common isolator and must
be fused 3A, maximum. This method of connection must be by a fused double pole isolating switch, with a
minimum contact separation of 3 mm on both poles. The switch should be readily accessible and preferably
adjacent to the appliance. It should supply the appliance only and be easily identifiable as so doing.
Gas safety (Installation and use) Regulations
In your interests and that of gas safety, it is the law that ALL gas appliances are installed and serviced by a
qualified registered person in accordance with the above regulations.
Gas leak or fault
If a gas leak or fault exists or is suspected, turn the boiler yoff and consult the local gas supply company or your
installation/service company.
Air in the heating system
Persistent air in the heating system may indicate leaks in the system or corrosion taking place. Call your
Installation/Servicing company.
Overheating safety
In the event of a problem, the overheating safety devices cause safety shutdown of the boiler. If this happens,
call your Installation/Servicing company.
Boiler controls
The control panel, located at the lower front of the boiler casing, see diagram 1, allows the boiler to be started,
shut down, controlled and monitored during use.
Flue
Do not obstruct the outside terminal of the flue.
Ancillary equipment
A range of flue accessories are available including vertical flues, twin-pipe flues, bends etc.
For further information contact your supplier.

6PROVITHERM 23 BTVE
Net lift weight (boiler only) . . . . . . . . . . . . . . . 36 kg
Gross lift weight (boiler and packaging) . . . . 37 kg
410
740
165
320
DIMENSIONS AND PRESSURE AVAILABLE
Diagram 3
Diagram 4

7
PROVITHERM 23 BTVE
TECHNICAL DATA – PROVITHERM 23 BTVE
Heating
Heat input (max) NET Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 kW / 85,300 BTU/H
Heat input (min) NET Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10,4 kW / 35,490 BTU/H
Heat output (max) NET P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 kW / 78,480 BTU/H
Heat output (min) NET P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8,7 kW / 29,670 BTU/H
Heat output (adjusted in manufacture) NET P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 kW *
Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91%
Maximum heating temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 °C
Expansion vessel effective capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 l
Expansion vessel charge pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,5 bar
Maximum system capacity at 75°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 l
Safety valve, maximum service pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 bar
Hot water
Heat input (max) NET Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 kW / 85,300 BTU/H
Heat input (min) NET Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10,4 kW / 35,490 BTU/H
Heat output (max) NET P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 kW / 78,480 BTU/H
Heat output (min) NET P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8,7 kW / 29,670 BTU/H
Maximum hot water temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 °C
Minimum hot water temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 °C
Specific flow rate (for 30°C temp rise) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11L/min.
Threshold flow rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,7 L/min.
Maximum supply pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 bar
Minimum supply pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,5 bar
Combustion
Products outlet diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 mm
Fresh air inlet diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mm
Electrical
Electrical supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 V ~ 50 Hz
Electrical rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 W fused at 3 A
Level of protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IPX4D
Fuse rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 mA
Natural Gas (G20)
∅Burner injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,2 mm
Inlet pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mbar
Maxi. Burner pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mbar
Mini. Burner pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 mbar
Gas rate maximum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,64 m3/h
* Note: Heat output adjusting – see section Servicing instruction

8PROVITHERM 23 BTVE
BOILER SCHEMATIC
1 Fan
2 Air pressure switch
3 Heat exchanger
4 Overheat thermostat
5 Combustion chamber
6 Expansion vessel
7 Ignition electrode
8 Burner
9 Flame sense electrode
10 Pump
11 Heating thermistor
12 Ignition module
13 By-pass
14 Gas valve
15 Loss of water sensor
16 Domestic hot water thermistor
17 Automatic air vent
18 Domestic water flow sensor
19 Filter cold water inlet
20 Filling system
21 Discharge safety valve (3 bar)
22 Heating filter
A Heating flow
B Domestic hot water outlet
C Gas
D Cold water inlet
E Heating return
Diagram 5

9
PROVITHERM 23 BTVE
'LDJUDP4XLHWFRUQHU
'LDJUDP2YHUKDQJ
'LDJUDP3RVLWLRQLQJRQWKHIDFDGH
)OXHWHUPLQDOVSRVVLELOLWLHV
places opened to public
another places
places for the positioning of flue terminals

10 PROVITHERM 23 BTVE
HEATING SYSTEM DESIGN
Heating System Design
• The Provitherm 23 BTVE is compatible with any type of installation.
• Heating surfaces may consist of radiators, convectors or fan assisted convectors.
• Pipe sectional areas shall be determined in accordance with normal practices, using the output/pressure curve
(diagram1). The distribution system shall be calculated in accordance with the output requirements of the actual
system, not the maximum output of the boiler. However, provision shall be made to ensure sufficient flow so that
the temperature difference between the flow and return pipes be less than or equal to 20°C.The minimum flow is
500 l/h.
• The piping system shall be routed so as to avoid any air pockets and facilitate permanent venting of the instal-
lation. Bleed fittings must be provided at every high point of the system and on all radiators.
• The total volume of water permitted for the heating system depends, amongst other things, on the static head in
the cold condition. The expansion vessel on the boiler is pressurised at 0.5 bar and allows a maximum system
volume of 70 litres for an average temperature of 75°C and a maximum service pressure of 3 bar.This pressure
setting can be modified at commissioning stage if the static head differs. An additional expansion vessel can be
fitted to the system if required.
• Provision shall be made for a drain valve at the lowest point of the system.
• Where thermostatic radiator valves are fitted, not all radiators must be fitted with this type of valve, and in
particular, where the room thermostat is installed.
• In the case of an existing installation, it is ESSENTIAL that the system is thoroughly flushed prior to installing
the new boiler, using a proprietary product such as Fenox or Sentinel. Contact the product manufacturers for
specific details.
Domestic Hot Water System Design
• Copper tubing or plastic Hep20 may be used for the domestic hot water system. Unnecessary pressure losses
should be avoided.
• The boiler will operate with a minimum supply pressure of 0,6 bar, but under reduced flow rate. Best operating
comfort will be obtained from a supply pressure of 1 bar.
Hard Water Areas
In areas where the water is ‚hard‘, more than 200 mg/litre, it is recommended that a proprietary scale reducer is
fitted in the cold water supply to the boiler.
Safety valve discharge
WARNING. It must not discharge above an entrance or
window or any type of public access area.The discharge
pipe must be extended using not less than 15 mm o.d.
pipe, to discharge in a visible position outside the build-
ing, facing downward preferably over a drain.
Note: Fit a compression fitting to facilitate service of the
appliance.
The pipe must have a continuous fall and be routed to
a position so that any discharge of water, possibly boil-
ing or steam, cannot create any danger to persons,
damage to property or external electrical components
and wiring. Tighten all pipe connection joints.
Gas connection
The supply from the governed gas meter must be of ade-
quate size to provide a constant inlet working pressure
of 20 mbar.
To avoid low gas pressure problems, it is recommended
that the 15 mm gas supply on the boiler is connected to
using 22 mm pipe (as close as possible to the boiler within 1 metre).
• On completion, the gas installation must be tested using the pressure drop method and purged in accordance
with the current issue of appropriate norm.
Sheet metal parts
WARNING: When installing or servicing this boiler, care should be taken when handling the edges of sheet metal
parts to avoid the possibility of personal injury.
DISCHARGE
SAFETY VALVE (3 bar)
Diagram 7

11
PROVITHERM 23 BTVE

12 PROVITHERM 23 BTVE
BOILER INSTALLATION
Installing the boiler
Prior to installing the boiler, the system must be thoroughly flushed to eliminate any foreign bodies and contami-
nents such as filings, solder, particles, oil, grease etc.
Note: Solvent products could cause damage to the system.
Flue to rear of boiler
• Mark correct position of hole from template.
Flue to side of boiler
• Mark the horizontal centre line for the hole on the rear wall. Extend the horizontal centre line to the side wall and
mark the vertical centre line of flue hole as shown in diagram 8.
Cutting the flue hole
• Making allowance for the slope of the flue, cut hole in external wall, preferably using a core drill. For installations
with internal and external access use a 105 mm diameter core drill. For installations with internal access only use
a 125 mm diameter core drill.
Important
When cutting the flue hole and when extending the flue centre line to a side wall, remember that the flue system
must have a fall of about 35 mm per metre of flue DOWNWARD towards the terminal.There must NEVER be a
downward incline towards the boiler.
Water connection
Connect the system pipework to the copper connections on the fixing jig observing the correct flow and return
format as shown in diagram 9. Do not subject the isolating valves to heat.
Control
valve
Flow
Drain
point
Bypass
valve
Domestic
water
Heating
circuit
Return
Additional
expansion
vessel
(if required)
Hot water out
Cold supply in
Boiler
Filling device
Diagram 9

13
PROVITHERM 23 BTVE
HORIZONTAL FLUE INSTALLATION
AAir inlet pipe
BTerminal
CSeal and clamp
DElbow
EGasket
FScrews
GExternal rubber sealing collar
IInternal plastic collar
J‘O’ rings
Standart top
outlet flue
90° elbow
Extension
pipe
Standart top
outlet flue
Diagram 10
• Fit gasket (E) onto underside of flue elbow (D).
• Carefully insert ‘O’ ring (J) into upper and lower parts of inner elbow.
• Fit elbow onto fan outlet.
• Fit external rubber sealing collar (G) onto air inlet pipe (A).
• Fit flue through hole in wall and pull up so that external collar (G) is flush against outside wall.
• Fit seal and clamp (C) to flue and assemble into elbow (D) making sure that both inner and outer pipes are sealed
properly.
Note: Maximum horizontal length with no bends is 4 m. For horizontal flue lengths up to 1 m the restrictor must be
left in the fan outlet, see diagram 11. For horizontal flue lengths between 1 and 4 m, remove the restrictor (R).
• Tighten up clamp using screws provided.
Note: Should it be necessary to cut the flue, always cut equal amounts from both inner and outer pipes.
Always cut the end furthest from the terminal.
For each 90° flue bend fitted, reduce overall flue length by 1 m.
For each 45° flue bend fitted, reduce overall flue length by 1/2 m.
Diagram 11

14 PROVITHERM 23 BTVE
VERTICAL FLUE INSTALLATION
• Fit gasket (E) onto underside of vertical adaptor (O)–see diagram 12.
• Carefully insert ‘O’ ring (J) into vertical adaptor inner spigot.
• Fit vertical adaptor (O) onto fan outlet.
• For flat roof installation, fit flat roof flashing collar (part no. 85107)
• Fit extension pipes (M) as required.
• For pitch roof installation, fit pitch roof flashing (part no. 85105).
• Fit flue terminal (L) onto roof ensuring flashing makes a watertight joint.
Note: Maximum vertical height with no bends is 9 m.
Should it be necessary to cut the flue, always cut equal amounts from both inner and outer pipes.
Connect condensate trap (supplied) to vertical flue adaptor when flue length exceeds 3 m.
Connect 15 mm plastic pipe (not supplied) to a suitable drain.
For vertical flue lengths up to 4 m the restrictor must be left in the fan outlet, see diagram 11.
For vertical flue lengths between 4 and 9 m, remove the restrictor (R).
For each 90° flue bend fitted, reduce overall flue height by 1 m.
For each 45° flue bend fitted, reduce overall flue height by 1/2 m.
Diagram 12

15
PROVITHERM 23 BTVE
FLUE CONFIGURATIONS
Diagram 13

16 PROVITHERM 23 BTVE
ELECTRICAL PART
Air flow switch take-off
CONNECTIONS TO THE AIR PRESSURE SWITCH
Pr
3
21
P2
P1
LH
Electrical contacts
Diagram 17
Warning.This boiler must be earthed
All system components must be of an approved type. Electri-
cal components have been tested to meet the equivalent re-
quirements.
Connection of the whole electrical system and any heating
system controls to the electrical supply must be through a
common isolator. Isolation should preferably be by a double
pole switched fused spur box having a minimum contact sep-
aration of 3 mm on each pole. The fused spur box should be
readily accessible and preferably adjacent to the boiler. It should
be identified as to its use.
A fused three pin plug and shuttered socket outlet may be
used instead of a fused spur box provided that both the plug
and socket comply with the current issue of appropriate norm.
The mains electrical supply must be maintained at all times in
order to provide domestic hot water.
Do not interrupt the mains supply with a time switch or pro-
grammer.
WARNING: UNDER NO CICUMSTANCES MUST ANY MAINS
VOLTAGE BE APPLIEDTO ANY OFTHE TERMINALS ON THE
VOLTAGE FREE HEATING CONTROLS CONNECTION PLUG.
Warning:This appliance must be wired in accordance with these
instructions. Any fault arising from incorrect wiring cannot be
put right under the terms of the guarantee.
External controls -Voltage Free
This boiler will operate on heating as supplied, provided that
the wire link (E) fitted between the two terminals of the heating
controls conection plug is left in place, see diagram 15.
External controls e.g. room thermostat, frost thermostat etc.
should be fitted in accordance with the rules in force.
Testing - Electrical
Checks to ensure electrical safety must be carried out by
a competent person.
After installation of the system, preliminary electrical system checks as below should be carried out.
1. Test insulation resistance to earth.
2. Test earth continuity and short circuit of all cables.
3.Test the polarity of the mains.The installer is requested to advise and give guidance to the user of the controls
scheme used with the boiler.
(E) Wire link
VOLTAGE
FREE
HEATING
CONTROLS
CONNECTION
PLUG
Diagram 15
CONTROL PANEL
Diagram 16

17
PROVITHERM 23 BTVE
COMMENCING BOILER OPERATION
The commissioning and first firing of the boiler must only be
done by a qualified registered person.
Gas installation
It is recommended that any air is purged from the supply at the
gas inlet test point on the gas valve, see diagram 18
A
GAS INLET
TEST POINT
Filling the system
1. Make sure that:
The boiler is connected to the electrical supply.
The gas service cock is open.
Turn the switch OFF ( 0 )
2. Undo cap ( A) on automatic air vent on top of pump and leave undone,
see diagram 19.
3. Turn the switch ON ( I )
Open the tap ( §) on the filling device (see
diagram 20) and fill the system until the pres-
sure indicated on the display is 2 bar. Close fill-
ing device.
4. Bleed each radiator to remove air, ensure all bleed screws are re-
tightened.
If necessary repressurise the system, refer to procedure 3.
5. Leave cap ( A) on automatic air vent on top of pump open, see dia-
gram 19.
6. Open various hot water taps to bleed system.
7. Ensure the display indicates a system pressure of 1.5 bar adjust if
necessary, see diagram 23.
Diagram 18
Diagram 19
Diagram 20
Diagram 23

18 PROVITHERM 23 BTVE
Installation filling:
• If the boiler loses water: the pressure gauge (a) and
fault display (b) will flash. Fill the system by the fill-
ing device (c) at the bottom of the boiler until the
pressure gauge reads 1.5 bar (see diagram 23).
Warning: Take care not to overfill the boiler. At a pres-
sure of 2.5 bar or above indicating over pressure, the
fault display (b) will flash. The pressure must be re-
duced to 1.5 bar by bleeding a radiator. If the fault
continues call your Installation/Servicing company or
Heatcall.
Warning: When purging the boiler, do not use the
valve on the expansion vessel – it is NOT a purging valve!!!
• Adjust heating temperature to maximum.
• Check that any external controls, if fitted, are calling for heat (set room thermostat to maximum).
• Allow the temperature to rise to the maximum value, with all radiator valves open.The temperature rise will cause
release of the gases contained in the water of the central heating system.
• Gases driven towards the boiler will be automatically released through the automatic air vent.
• The gases trapped at the highest point of the system must be released by bleeding the radiators. Check the
burner gas rate required, ten minutes from lighting. Refer to Data Label on electrical controls box. Should there be
any doubt about the gas rate it should be checked at the meter. On reaching maximum temperature, the boiler
should be turned off and the system drained as rapidly as possible whilst still hot.
• Refill system to a pressure of between 1 and 2 bar and vent as before.
• Restart boiler and operate until a maximum temperature is reached. Shut down boiler and vent heating system.
If necessary, top up heating system and make sure that a pressure of at least 1 bar is indicated when system is
COLD.
Flush the domestic hot water system by opening the hot water taps for several minutes.
Boiler start
Before starting the boiler, check whether:
• The main gas valve is open;
• The gas valve on the boiler is open;
• Water valves (DHW, heating) are open;
• The boiler’s cord is plugged in.
Bypass
The Provitherm 23 BTVE boiler has a built-in bypass.This
must be adjusted according to the requirements of the sys-
tem, refer to the flow rate pressure curve (diagram 1).The
boiler is supplied with the built-in bypass open a half a turn.
It is adjusted by turning the bypass screw (A), see dia-
gram 24. Turn the screw clockwise to close the bypass.
When using thermostatic radiator valves (TRV’s) on all of
the radiators, it is essential that a separate, adjustable by-
pass of 15 mm minimum diameter is fitted between the
flow and return of the heating circuit, see diagram 8. Any
bypass must be fitted before system controls.
(a) (b) (c)
Diagram 23
Diagram 24

19
PROVITHERM 23 BTVE
SAFETY DEVICES
The Provitherm 23 BTVE incorporates a visual fault display that indicates certain-
fault conditions, (red flashing light, see diagram 25) should they occur.
Should the boiler fail to operate during Commissioning, themost likely fault is that the
gas supply to the boiler has not been turned on or purged sufficiently or that there is
no pressure in the heating system.
General safety devices
Air flow rate safety device
If an obstruction, even partial, of the flue occurs, for any reason whatsoever, the built in safety system of the
boiler will turn the boiler OFF, the red light will flash and the fan will continue to run. The boiler will be ready to
operate when the fault has been cleared.
Heating safety valve
CAUTION: A heating safety valve with a discharge pipe is fitted to this boiler.The valve MUST NOT BE TOUCHED
except by a qualified registered person. If the valve discharges at any time, switch the boiler off and isolate it
from the electrical supply. Contact your installation/service company.
In case of power supply failure
The boiler no longer operates. As soon as power supply is restored, the boiler will be automatically restarted.
If the gas supply is interrupted
The boiler switches over to safety mode, the red light will flash. Call a your installation/service companyy .
Air in pipes
Important: A central heating system can not operate correctly unless it is filled with water and air bled from the
system. If these conditions are not met the system may be noisy. Bleed the air in the radiators and adjust the
pressure if system requires. If the system requires filling to often this may be due to minor leaks or corrosion in
the system. Call a qualified service engineer.
Frost protection
The Provitherm 23 BTVE has a built in frost protection device that protects the boiler from freezing. If the boiler is
to be left and there is a risk of frost, ensure that the gas and electrical supplies are left connected. The frost
protection device will light the boiler when the temperature of the boiler water falls below 4°C.When the temper-
ature reaches 8°C, the boiler stops.
Note: This device works irrespective of any room thermostat setting and will protect the complete heating system.
Diagram 25