Potterton Performa 24 User guide

Installation and Servicing Instructions
Performa 24
Gas Fired Wall Mounted Combination Boiler
Please leave these instructions with the user

0011210500
Dear Customer,
We are sure your new boiler will comply with
all your requirements.
Purchasing one of the POTTERTON products
satisfies your expectations: good functioning,
simplicity and ease of use.
Do not dispose of this booklet without reading
it: you can find here some very useful
information, which will help you to run your
boiler correctly and efficiently.
Do not leave any parts of the packaging (plastic bags, polystyrene, etc.)
within children’s reach as they are a potential source of danger.
POTTERTON attests that these models of boiler bear the
CE mark in compliance with the basic requirements as laid
down in the following Directives:
- Gas Directive 90/396/CEE
- Performance Directive 92/42/CEE
- Electromagnetic Compatibility Directive 89/336/CEE
- Low Voltage Directive 73/23/CEE
POTTERTON
POTTERTON

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Contents
Instructions pertaining to the user
Instructions prior to installation 4
Instructions prior to commissioning 4
Commissioning of the boiler 4
Room temperature adjustment 5
DHW temperature adjustment 5
Filling the boiler 6
Turning off the boiler 6
Prolonged standstill of the system. Frost protection
(central heating system) 6
Gas change 6
Safety Device Indicators-Activation 7
Servicing instructions 7
Instructions pertaining to the installer
General information 8
Instructions prior to installation 8
The template to fix the boiler on the wall 10
Boiler size 10
Installation of flue and air ducts 11
Connecting the mains supply 16
Fitting a room thermostat 16
Connecting a programming clock 16
Gas change 17
Control operation devices 20
Positioning of the ignition
and flame sensing electrode 22
Electronic board calibration 22
Check of combustion parameters 22
Output / pump head performances 23
How to purge the DHW system from
limestone deposits 23
How to disassemble the DHW heat exchanger 24
Cleaning the cold water filter 24
Boiler schematic 25
Illustrated wiring diagram 26
Technical data 27
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Instructions pertaining to the user
Instructions prior to installation
This boiler is designed to heat water at a lower than boiling temperature
at atmospheric pressure. The boiler must be connected to a central heating
system and to a domestic hot water supply system in compliance with
its performances and output power.
Have the boiler installed by a Qualified Service Engineer and ensure the
following operations are accomplished:
a) careful checking that the boiler is fit for operation with the type of
gas available. For more details see the notice on the packaging and
the label on the appliance itself.
b) that the terminal is not obstructed and that no other appliance exhaust
gases are expelled through the same flue duct, unless the flue is
especially designed to collect the exhaust gas coming from more than
one appliance, in conformity with the laws and regulations in force.
c) careful checking that, in case the flue has been connected to pre-
existing flue ducts, thorough cleaning has been carried out in that
residual combustion products may come off during operation of the
boiler and obstruct the flue duct thus engendering dangerous situations.
Instructions prior to
commissioning
Initial lighting of the boiler must be carried out by a licensed technician.
Ensure the following operations are carried out:
a) compliance of boiler parameters with (electricity, water, gas) supply
systems settings.
b) compliance of installation with the laws and regulations in force.
c) appropriate connection to the power supply and grounding of the
appliance.
Failure to observe the above will render the guarantee null and void.
Prior to commissioning remove the protective plastic coating from the
unit. Do not use any tools or abrasive detergents as you may spoil the
painted surfaces.
Commissioning of the boiler
To correctly light the burner proceed as follows:
1) provide power supply to the boiler;
2) open the gas cock;
3) turn the selector switch (1) to set the boiler on summertime ( ) or
wintertime ( ) operation;
4) turn the central heating (5) and domestic hot water (6) adjusting
controls in order to light the main burner.
To increase temperature values turn the control clockwise and
anticlockwise to decrease it.
When on summertime operation ( ) the main burner and the pump
will start running only when there is a call for hot water.
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0210_0206
Figure 1
Figure 2
Warning: During initial lighting, until the air contained in the gas pipes
is not released, the burner may fail to light immediately and that may
cause a ‘blockage’ of the boiler. In this case we recommend you repeat
the ignition procedure until gas is delivered to the burner, setting selector
(1) to ( ) for at least 1 second (see also figure 4).
Room temperature adjustment
The system must be equipped with a room thermostat (see the relevant
regulations) to control the temperature in the rooms.
In case there is no room thermostat, during initial lighting it will be
possible to control the room temperature by turning control (5).
To increase temperature values turn the control clockwise and
anticlockwise to decrease it. Electronic modulation of the flame will
enable the boiler to reach the set temperature by adapting the gas supply
to the burner to the actual heat exchange demand.
DHW temperature adjustment
The gas valve is provided with an electronic flame-
modulating function, which operates depending on
the DHW temperature adjusting control (6) settings
and on the quantity of water drawn from the taps.
This electronic device allows to keep the water
coming out of the boiler at a constant temperature
also when small quantities of water are drawn.
To ensure energy saving and economical manage-
ment of your boiler, we recommend you place the
switch adjusting the hot water temperature on
“comfort” (see figure 2). In wintertime it will be
necessary to increase the DHW temperature
according to needs.
comfort zone
0403_0802

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9909270100
Boiler filling tap Boiler drain valve
Figure 3
Filling the boiler
Important: Regularly check that the pressure displayed by the pressure
gauge (7) is 0.5 to 1 bar, with boiler not operating. In case of overpressure,
open the boiler drain valve.
In case the pressure is lower open the boiler filling tap (figure 3).
We recommend you open the tap very slowly in order to let off the air.
In case pressure drops occur frequently have the boiler checked by a
Qualified Service Engineer.
The boiler is supplied with a hydraulic differential pressure sensor, which
blocks the boiler in case water is lacking or the pump is blocked.
Turning off the boiler
To turn off the boiler turn the selector switch (1) on (0); you will thus
isolate the electrical supply to the boiler.
Prolonged standstill of the system.
Frost protection (central heating system)
We recommend you avoid draining the whole system as water
replacements engender purposeless and harmful limestone deposits inside
the boiler and on the heating elements.
In case the boiler is not operated during wintertime and is therefore
exposed to danger of frost we suggest you add some specific-purpose
anti-freeze to the water contained in the system (e.g.: propylene glycole
coupled with corrosion and scaling inhibitors).
Gas change
These boilers produced for natural gas can be converted to work with
LPG.
Any gas change must be effected by a Qualified Service Engineer.

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Figure 4 0209_3022
Safety device Indicators-
activation
1Summer-Winter-Reset selector
2Flame indicator
3Block indicator
4Voltage presence indicator
If safety device activation is repeated contact the authorised Technical
Assistance Service.
NOTE*
Slow flashing: comes on approximately once every 2 seconds
Fast flashing: comes on approximately twice a second
Servicing instructions
To maintain efficient and safe operation of your boiler have it checked
by a Qualified Service Engineer at the end of every operating period
.
Careful servicing will ensure economical operation of the system.
Do not clean the outer casing of the appliance with abrasive, aggressive
and/or easily flammable cleaners (i.e.: gasoline, alcohol, and so on).
Always isolate the electrical supply to the appliance before cleaning it
(see section Turning off the boiler on page 6).
Trouble
Gas block
No draught
No water in the heating circuit
or pump jammed
Probe broken
Safety thermostat tripping
Indicator
LED 2 LED 3
off on
off Fast flashing
off
Slow flashing
Slow flashing Slow flashing
on
Slow flashing
Reset
Set selector 1 to position R for at least 1 second.
Call your Authorised Service Centre
See circuit filling chapter
Call your Authorised Service Centre
Set selector 1 to position R for at least 1 second.

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Instructions pertaining
to the installer
0209_3021
General information
Warning: When the selector switch (1) is
set on Wintertime operation ( ) it may
be necessary to wait some minutes at each
intervention of the central heating tempera-
ture adjusting control (5). To relight the main
burner immediately place the selector switch
(1) on (0) and then again on ( ). No
waiting is needed when the boiler is in the
DHW mode on models with this option.
The following remarks and instructions are addressed to Service
Engineers to help them carry out a faultless installation. Instructions
regarding lighting and operation of the boiler are contained in the
‘Instructions pertaining to the user’ section.
Note that installation, maintenance and operation of the domestic gas
appliances must be performed exclusively by qualified personnel in com-
pliance with current standards.
Please note the following:
*This boiler can be connected to any type of double- or single feeding
pipe convector plates, radiators, thermoconvectors. Design the system
sections as usual though taking into account the available output /
pump head performances, as shown on page 23.
*Do not leave any packaging components (plastic bags, polystyrene,
etc.) within children’s reach as they are a potential source of danger.
*Initial lighting of the boiler must be effected by a Qualified Service
Engineer.
Failure to observe the above will render the guarantee null and void.
Instructions prior to installation
This boiler is designed to heat water at a lower than boiling temperature
at atmospheric pressure. The boiler must be connected to a central heating
system and, on models withis option, to a domestic hot water supply
system in compliance with its performances and output power.
Before connecting the boiler have the following operations effected:
a) careful checking that the boiler is fit for operation with the type of
gas available. For more details see the notice on the packaging and
the label on the appliance itself.
b) careful checking that the flue terminal draft is appropriate; that the
terminal is not obstructed and that no other appliance exhaust gases
are expelled through the same flue duct, unless the flue is especially
designed to collect the exhaust gase coming from more than one
appliance, in conformity with the laws and regulations in force
c) careful checking that, in case the flue has been connected to pre-
existing flue ducts, thorough cleaning has been carried out in that
residual combustion products may come off during operation of the
boiler and obstruct the flue duct thus engendering dangerous
situations.

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To ensure correct operation of the appliance and avoid invalidating the
guarantee, observe the following precautions
1. Hot water circuit:
if the water hardness is greater than 20 °F (1 °F = 10 mg calcium carbonate
per litre of water) install a polyphosphate or comparable treatment system
responding to current regulations.
2. Heating circuit
2.1. new system
Before proceeding with installation of the boiler, the system must
be cleaned and flushed out thoroughly to eliminate residual thread-
cutting swarf, solder and solvents if any, using suitable proprietary
products.
2.2. existing system:
Before proceeding with installation of the boiler, the system must
be cleaned and flushed out to remove sludge and contaminants, using
suitable proprietary products.
To avoid damaging metal, plastic and rubber parts, use only neutral
cleaners, i.e. non-acid and non-alkaline (e.g. SENTINEL X400 and
X100), proceeding strictly in accordance with the maker’s directions.
Remember that the presence of foreign matter in the heating system can
adversely affect the operation of the boiler (e.g. overheating and noisy
operation of the heat exchanger)

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The template to fix the boiler on
the wall
Decide upon the boiler location, then tape the template on the wall.
Connect the pipework to the gas and water inlets prearranged on the
template lower bar.
We suggest you fit two G3/4 stop cocks (available on demand) on the
central heating system flow and return pipework; the cocks will allow to
carry out important operations on the system without draining it
completely.
If you are either installing the boiler on a pre-existent system or
substituting it, we suggest you also fit settling tanks on the system return
pipework and under the boiler to collect the deposits and scaling which
may remain and be circulated in the system after the purge.
When the boiler is fixed on the template connect the flue and air ducts
(fittings supplied by the manufacturer) according to the instructions given
in the following sections.
0010171200
Figure 5
MR: G3/4 heating flow
US: G1/2 domestic hot water outlet
GAS: G3/4 gas inlet to the boiler
ES: G1/2 cold water inlet
RR: G3/4 heating return
Figure 6
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Boiler size