Potterton Performa 28i User guide

Installation and
Servicing Instructions
Please leave these instructions with the user
Performa 28i
Gas Fired Wall Mounted Combination Boiler

2
Natural Gas
Potterton Performa 28i
G.C.No47 393 08
The boiler meets the requirements of Statutory
Instrument “ The Boiler (Efficiency) Regulations
1993 No3083” and is deemed to meet the
requirements of Directive 92/42/EEC on the energy
efficiency requirements for new hot water boilers
fired with liquid or gaseous fuels:-
Type test for purpose of Regulation 5 certified by:
Notified Body 0051.
Product/Production certified by:
Notified Body 0051.
For GB/IE only.

3
1.0 Introduction 4
2.0 General Layout 6
3.0 Appliance Operation 7
4.0 Technical Data 9
5.0 Dimensions and Fixings 10
6.0 System Details 11
7.0 Site Requirements 14
8.0 Installation 19
9.0 Commissioning the Boiler 24
10.0 Completion 26
11.0 Servicing the Boiler 27
12.0 Changing Components 29
13.0 Illustrated Wiring Diagram 38
14.0 Fault Finding 39
15.0 Short Parts List 46
Section Page
Contents

Potterton declare that no substances
harmful to health are contained in the
appliance or used during appliance
manufacture.
1.1 Description
1. The Potterton Performa 28i is a fully automatic
gas fired wall mounted combination boiler. It is
room sealed and fan assisted, and will serve
central heating and mains fed domestic hot water.
2.The unit incorporates a small storage cylinder
built into the boiler providing hot water the moment
the tap is turned on.
3. The boiler is set to give a maximum output of
29.4 kW in both modes.
4. It is designed for use on Natural Gas (G20) and
can be converted to use Propane.
5. The boiler is suitable for use only on fully
pumped sealed heating systems. Priority is given
to domestic hot water.
6. The boiler data badge gives details of the
model, serial number and Gas Council number
and is situated on the control box. It is visible when
the case front panel is removed (Fig. 1).
7. The boiler is intended to be installed in
residential / commercial / light industrial E.M.C.
environments on a governed meter supply only.
8. The boiler must be installed with one of the
purpose designed flues such as the standard
horizontal flue kit, part no. 247719.
9. All systems must be thoroughly flushed and
treated with inhibitor (see section 6.2).
1.2 Installation
1. The appliance is suitable for installation only in
G.B. and I.E. and should be installed in
accordance with the rules in force. For Ireland
install in accordance with I.S.813 “INSTALLATION OF
GAS APPLIANCES”. The installation must be carried
out by a CORGI Registered Installer or other
competent person and be in accordance with the
relevant requirements of GAS SAFETY (Installation
and Use) REGULATIONS, the BUILDING REGULATIONS
(Scotland) (Consolidation), the LOCAL BUILDING
REGULATIONS, the CURRENT I.E.E. WIRING
REGULATIONS and the bye laws of the LOCAL WATER
UNDERTAKING. Where no specific instructions are
given, reference should be made to the relevant
BRITISH STANDARD CODES OF PRACTICE.
1.0 Introduction
4
Data Badge
Fig. 1
Control Box
“Benchmark”Log Book
As part of the industry-wide “Benchmark”initiative all Potterton boilers now
include an Installation, Commissioning and Service Record Log Book.
Please read the Log Book carefully and complete all sections relevant to
the appliance and installation. These include sections on the type of
controls employed, flushing the system, burner operating pressure etc.
The details of the Log Book will be required in the event of any warranty
work. Also, there is a section to be completed at each subsequent regular
service visit. The Log Book must be left with the User.
Case Front Panel
NOTE: This appliance must be installed in
accordance with the manufacturer’s instructions
and the regulations in force.Read the instructions
fully before installing or using the appliance.

1.0 Introduction
5
1.3 Instant Domestic Hot Water
(Expansion Vessel & Pre-Heat Store)
1. The boiler expansion vessel incorporates a
small volume of stored primary hot water.
2. When the boiler has been off and there is then
a demand for domestic hot water the stored
primary hot water ensures that domestic hot water
is supplied instantly at temperature.
3. The stored hot water is part of the primary
circuit. This is not supplied as domestic hot water,
which is fresh mains water heated by a heat
exchanger within the boiler.
4. The stored primary hot water temperature is
maintained whilst the boiler is in operation. During
a period when there is no demand for heating or
hot water the temperature of the stored primary
hot water will eventually fall. The boiler will
operate occasionally in order to maintain the
temperature. This is indicated by the domestic hot
water mode neon flashing.
1.4 Optional Extras
1. Various flue extensions, bends, vertical flue
kits, control accessories etc. are available as
optional extras. These are detailed in a separate
publication.

2.0 General Layout
6
2.1 Layout
1. Air Pressure Switch
2. Expansion Vessel & Pre-Heat Store
3. Burner Manifold
4. Automatic Air Vent
5. DHW Plate Heat Exchanger
6. Circulation Pump
7. Drain Off Point
8. Pressure Relief Valve
9. Position for Optional Integral Timer
10. Central Heating System Pressure Gauge
11. PCB
12. Control Box
13. 3-Way Valve Assembly
14. Spark Generator
15. Flame Sensing Electrode
16. Spark Electrode
17. Burner
18. Primary Heat Exchanger
19. Fan Assembly
20. On/Off/Reset Selector Switch
21. Central Heating Temperature Control
22. Domestic Hot Water Pre-Heat Control
23. Flame Failure
24. Safety Thermostat
25. Fault on Fan or Flue
26. Fault on Pump or Low System Pressure
27. Fault on Hot Water Sensor
28. Fault on Central Heating Sensor
29. Power On
30. Domestic Hot Water Mode
31. Central Heating Mode
32. Burner On
When neons 23 to 28 are constantly illuminated,
they indicate the temperature of the central heating
water.
19
18
17
14
15
16
13
12 11
10 9
20 21 22 10 9
7
6
3
4
5
8
2
1
2
1
0
4
3
bar
30°40°50°60°70°80°
Reset
Preheat
Off
On
30°40°50°60°70°80°
23 24 25 26 27 28
29 30 31 32

3.0 Appliance Operation
7
NOTE: All delay timers mentioned in 3.1 and 3.2
are overridden by domestic hot water demand.
3.1 Central Heating Mode (Fig. 2)
1. With a demand for heating, the pump circulates
water through the primary circuit. At a pre-
determined flow rate the central heating flow
switch operates, initiating the ignition sequence.
2. The main burner ignites at low rate, then the
gas valve controls the gas rate to maintain the
heating temperature measured by the
temperature sensor.
3. When the flow temperature exceeds the setting
temperature, a 3 minute delay occurs before the
burner relights automatically (anti-cycling). The
pump continues to run during this period.
4. When the demand is satisfied the burner is
extinguished and the pump continues to run for a
period of 30 seconds (Pump Overrun).
5. If there is no other demand the pre-heat
function will operate if switched on (see Section
3.2).
3.2 Domestic Hot Water - Preheat Mode
(Fig. 3)
1. With the pre-heat function switched on (pre-
heat control fully clockwise), priority is given to the
replenishment of the pre-heat store. The DHW
mode neon ( ) will flash during this function.
2. The diverter valve remains in the DHW priority
position. This allows the pump to circulate hot
water to the store and back to the primary heat
exchanger via the bypass pipe.
3. The automatic ignition sequence commences
after approximately 25 seconds and the burner
will light.
4. When the store reaches the desired
temperature the burner is extinguished. The pump
continues to run for a period of 30 seconds.
5. Following a demand for domestic hot water or
the end of a central heating ON period, the pre-
heat function restarts.
27 19
16 15 14 13 12
10
9
11
8
17
21
23
20 22
19
28
26
56
7
2
34
1
25
24
18
1 Primary Heat Exchanger
2 Burner
3 Ignition Electrode
4 Flame Sensing Electrode
5 Gas Valve
6Pump
7 Automatic Air Vent
8 Plate Heat Exchanger
9 Flow Sensor with Filter
10 Pressure Relief Valve
11 Boiler Drain Point
12 Heating Return
13 Cold Water Inlet On/Off Valve and Filter
14 Gas Inlet
15 Domestic Hot Water Outlet
16 Heating Flow
17 Pressure Gauge
18 Hydraulic Pressure Sensor Microswitch
19 Automatic By-Pass
20 Hydraulic Pressure Sensor
21 Diverter Valve Assembly
22 Domestic Hot Water Flow Priority Assembly
23 Domestic Hot Water Flow Priority Microswitch
24 Safety Thermostat
25 Central Heating Temperature Sensor
26 Expansion Vessel & Pre-Heat Store
27 Domestic Hot Water Temperature Sensor
Key
Central Heating Mode
Fig. 2
27 19
16 15 14 13 12
10
9
11
8
17
21
23
20 22
19
28
26
56
7
2
34
1
25
24
18
Domestic Hot Water - Preheat Mode
Fig. 3

3.0 Appliance Operation
8
3.3 Domestic Hot Water Mode (Fig. 3A)
1. Priority is given to the domestic hot water
supply. A demand at a tap or shower will override
any central heating requirement.
2. The flow of water will operate the DHW flow
switch which requests the 3 way valve to change
position. This will allow the pump to circulate the
primary water through the DHW plate heat
exchanger and take the stored water to give
instant hot water.
3. The burner will light automatically and the
temperature of the domestic hot water is
controlled by the temperature sensor.
4. When the domestic hot water demand ceases
the burner will extinguish and the diverter valve
will remain in the domestic hot water mode,
unless there is a demand for central heating.
5. If there is no other demand the pre-heat
function will operate if switched on (see Section
3.2)
IMPORTANT: When the selector switch is in
the ‘0’(Off) position the electrical supply to the
boiler is isolated. The boiler will not operate
and the integral timer (if fitted) will require
resetting once the selector switch is set to
either Position (i) or Position (ii).
3.4 Frost Protection Mode
1. The frost protection mode is integral to the
appliance and functions only with the selector
switch (Section 2.1) in the domestic hot water and
central heating position. If the system temperature
falls below 5°C then the boiler will fire on its
minimum setting until a flow temperature of 30°C
is reached. Further protection can be incorporated
by using a system frost thermostat.
3.5 Pump Protection
1. With the selector switch (see Section 2.1) in
either the central heating or central heating and
domestic hot water position the pump will
automatically operate for 1 minute in every 24
hours to prevent sticking.
27 19
16 15 14 13 12
10
9
11
8
17
21
23
20 22
19
28
26
56
2
34
1
25
24
18
7
1 Primary Heat Exchanger
2 Burner
3 Ignition Electrode
4 Flame Sensing Electrode
5 Gas Valve
6Pump
7 Automatic Air Vent
8 Plate Heat Exchanger
9 Flow Sensor with Filter
10 Pressure Relief Valve
11 Boiler Drain Point
12 Heating Return
13 Cold Water Inlet On/Off Valve and Filter
14 Gas Inlet
15 Domestic Hot Water Outlet
16 Heating Flow
17 Pressure Gauge
18 Hydraulic Pressure Sensor Microswitch
19 Automatic By-Pass
20 Hydraulic Pressure Sensor
21 Diverter Valve Assembly
22 Domestic Hot Water Flow Priority Assembly
23 Domestic Hot Water Flow Priority Microswitch
24 Safety Thermostat
25 Central Heating Temperature Sensor
26 Expansion Vessel & Pre-Heat Store
27 Domestic Hot Water Temperature Sensor
Key
Fig. 3A
Domestic Hot Water Mode

4.0 Technical Data
9
4.2 Performa 28i
Flue Terminal Diameter 100mm
Dimensions Projection 95mm
Outercase Dimensions
Casing Height - 780mm
Overall Height Inc Flue
Elbow - 980mm
Casing Width - 450mm
Casing Depth - 345mm
Clearances
Both Sides 5 mm Min
Above Casing 200 mm Min
Below Casing 200 mm Min
Front 450 mm Min (For Servicing)
Front 5 mm Min (In Operation)
Weights kg
Packaged Boiler Carton 50.5
Packaged Flue Kit 3
Installation Lift Weight 44
Central Heating Primary Circuit
Pressures
bar
Safety Discharge 3
Max Operating 2.5
Min Operating 0.5
Recommend Operating 1-2
DHW Circuit bar
Pressures
Max Operating 8
Min Operating 0.2
Min Operating Pressure
at 12.7 l/min 0.96
Flow Rates l/min
DHW Flow Rate
@ 30o C Rise 13.9
DHW Flow Rate
@ 35o C Rise 12.0
Min Working
DHW Flow Rate 2.5
Pump - Grundfos UP 15-60
Available Head See graph below
Expansion Vessel - (For Central Heating
only. Integral with appliance)
bar
Min Pre-charge Pressure 0.5
litre
Max Capacity of
CH System 80
Primary Water Content
of Boiler (unpressurised) 3.2
Connections copper tails
Gas Supply - 22mm
Central Heating Flow - 22mm
Central Heating Return - 22mm
Cold Water Mains Inlet - 15mm
DHW Flow - 15mm
Pressure Relief Discharge - 15mm
Recommended System
Temperature Drop 11°C20°F
Temperatures
C.H. Flow Temp (adjustable)
35°C to 85°C max (± 5°C)
D.H.W. Flow Temp
35°C to 65°C max (± 5°C)
dependent upon flow rate
50°C Pre-heat OFF
65°C Pre-heat ON ± 5°C
dependent upon flow rate
Heat Input C/H & DHW (Gross)
Max Min
kW 32.6 11.9
Btu/h 111,250 40,610
Heat Output Max Min
kW 29.4 10.4
Btu/h 100,330 35,490
Electrical Supply 230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Power Consumption 190W
External Fuse Rating 3A
Internal Fuse Rating
Fuse 2A Fast Blow to BS 4265
Appliance Category CAT II 2H 3P
Max Gas Rate (Natural Gas - G20)
(After 10 Mins)
m3/h 3.45
ft3/h 122
Inlet Pressure (Natural Gas - G20)
mbar 20
in wg 8
Burner Injector (Natural Gas - G20)
15 x 1.28mm Diameter
Burner Pressure (Natural Gas - G20)
Max Rate Min Rate
mbar 12.5 ± 0.5 1.8 ± 0.2
in wg 5.0 ± 0.2 0.72 ± 0.2
Appliance Type C12 C32 NOxClass 3
Electrical Protection
IPX5D
This value is used in the UK Government’s Standard
Assessment Procedure (SAP) for energy rating of dwellings.
The test data from which it has been calculated have been
certified by 0051.
SEDBUK Declaration
The seasonal efficiency (SEDBUK) is 78.2 %
0
200 400 600 800 1000 1200
0.5
1
1.5
2
2.5
3
3.5
4
Metre wg
l/h
Pump - Available Head
0
5
4.5
LPG Propane - G31
Burner Injector 15 x 0.77mm diameter
Burner Pressure
Propane mbar
in wg
Inlet Pressures
mbar
in wg
Max Rate
34.4 ±0.5
13.8 ±0.2
Min Rate
5.1 ±0.2
2 ±0.2
37
14.8

5.0 Dimensions and Fixings
10
Dimensions
A780mm
B345mm
C450mm
D107mm ØMin.
E200mm
F190mm
G143mm
360°Orientation
Tube Ø100mm
DC
B
A
E
G
F
Domestic Hot
Water Outlet
(15mm)
Cold Water
Inlet
(15mm)
Heating
Return
(22mm)
Heating
Flow
(22mm)
Pressure Relief
Valve
(15mm)
Gas
Inlet
(22mm)
65 mm 65 mm 65 mm 65 mm 65 mm
Tap Rail

6.0 System Details
11
6.1 Information
1. The Potterton Performa 28i Combination Boiler is
‘Water Byelaws Scheme - Approved Products’.
To comply with the Water Byelaws your attention is
drawn to the following installation requirements and
notes (IRN).
a) IRN 001 - See text of entry for installation
requirements and notes.
b) IRN 116 - Byelaw 90 and 91.
c) IRN 302 - Byelaw 14.
2. Reference to the WRc publications, ‘Water fittings
and materials directory’and ‘Water supply byelaws
guide’give full details of byelaws and the IRNs.
6.2 Central Heating Circuit
1. The appliance is suitable for fully pumped SEALED
SYSTEMS ONLY.
Treatment of Water Circulating Systems
•All recirculatory water systems will be subject to
corrosion unless an appropriate water treatment is
applied. This means that the efficiency of the system
will deteriorate as corrosion sludge accumulates
within the system, risking damage to pump and
valves, boiler noise and circulation problems.
•For optimum performance after installation this
boiler and its associated central heating system must
be flushed in accordance with the guidelines given in
BS 7593 “Treatment of water in domestic hot water
central heating systems”.
•This must involve the use of a proprietary cleanser,
such as BetzDearborn Sentinel X300 or X400, or
Fernox Superfloc. Full instructions are supplied with
the products, but for immediate information please
contact BetzDearborn (0151 420 9563) or Fernox
(01799 550 811) directly.
•For long term protection against corrosion and
scale, after flushing it is recommended that an
inhibitor such as BetzDearborn Sentinel X100, or
Fernox MB-1 or Copal is dosed in accordance with
the guidelines given in BS 7593.
Failure to flush and add inhibitor to the system
may invalidate the appliance warranty.
•It is important to check the inhibitor concentration
after installation, system modification and at every
service in accordance with the manufacturer’s
instructions. (Test kits are available from inhibitor
stockists.)
6.3 Bypass
1. The boiler is fitted with an automatic integral
bypass.
6.4 System Control
1. The boiler is designed for use in a heating
system that incorporates external controls, i.e. a
minimum of a timer device.
2. Suitable timer kits are available as optional
extras.
3. For optimum operating conditions and maximum
economy the fitting of a programmable room
thermostat is recommended.

6.0 System Details
12
6.5 System Filling and Pressurising
1. A filling point connection on the central heating
return pipework must be provided to facilitate
initial filling and pressurising and also any
subsequent water loss replacement/refilling.
2. The filling method adopted must be in
accordance with all relevant water supply bye-
laws and use approved equipment.
3. Your attention is drawn to: IRN 302 and Byelaw
14.
4. The sealed primary circuits may be filled or
replenished by means of a temporary connection
between the circuit and a supply pipe, provided a
‘Listed’double check valve or some other no less
effective backflow prevention device is
permanently connected at the inlet to the circuit
and the temporary connection is removed after
use (Fig. 4).
5. There are connection points on the mains cold
water inlet and central heating return isolation
taps (Fig. 4a) to which the optional Filling Loop Kit
(Pt. No. 248221) can be assembled.
6.6 Expansion Vessel
(Central Heating only)
1. The appliance expansion vessel is pre-charged
to 0.5 bar. Therefore, the minimum cold fill
pressure is 0.5 bar. The vessel is suitable for
correct operation for system capacities up to 80
litres. For greater system capacities an additional
expansion vessel must be fitted - refer to BS 7074
Pt 1.
6.7 Pressure Relief Valve (Fig. 5)
1. The pressure relief valve is set at 3 bar,
therefore all pipework, fittings, etc. should be
suitable for pressures in excess of 3 bar.
2. The pressure relief discharge pipe should be
not less than 15mm dia, run continuously
downward, and discharge outside the building,
preferably over a drain. It should be routed in
such a manner that no hazard occurs to
occupants or causes damage to wiring or
electrical components. The end of the pipe should
terminate facing down and towards the wall.
3. The discharge must not be above a window,
entrance or other public access. Consideration
must be given to the possibility that boiling
water/steam could discharge from the pipe.
Fig. 5
Stop Valve
Double
Check
Valve
DHW
Mains
Inlet
CH
Return
Temporary
Hose
Pressure Relief Valve
Filling Loop
Discharge Pipe
Fig. 4
Fig. 4a

6.0 System Details
13
6.8 Domestic Hot Water Circuit (Fig. 6)
1. All DHW circuits, connections, fittings, etc.
should be fully in accordance with relevant
standards and water supply bye-laws.
2. Your attention is drawn to:
IRN 116 and the Water Supply (Water Fittings)
Regulations 1999 Schedule 2, Section 8,
paragraph 17. Sealed primary circuits and/or
secondary hot water systems shall incorporate a
means for accommodating the thermal expansion
of water to prevent any discharge from the circuit
and/or system, except in an emergency situation.
3. When the system includes any device which
prevents water expanding back towards the
supply (check valve, loose jumpered stopcock,
water meter, water treatment device), then an
expansion vessel must be fitted (e.g. Zilmet
160ml, R1/215bar). To comply with Byelaw 91, a
check valve must also be fitted on the supply as
shown, to ensure efficient operation and also to
prevent the reverse flow of hot water into the
supply pipe.
4. If the hot water expansion is not provided for,
then high pressures can develop which may
result in damage to fittings and devices on the
system.
5. The boiler’s maximum working mains pressure
is 8 bar, therefore all pipework, connections,
fittings, etc. should be suitable for pressures in
excess of 10 bar. A pressure reducing valve must
be fitted for pressures in excess of 10 bar. The
manufacturer of any outlet fittings, such as a
shower valve, may require a lower maximum
pressure. The pressure reduction must take
account of all fittings connected to the DHW
system.
6.9 Showers
1. If a shower control is supplied from the
appliance it should be of the thermostatic or
pressure balanced type. Thermostatic type
shower valves provide the best comfort and
guard against water at too high a temperature.
Existing controls may not be suitable - refer to the
shower valve manufacturer.
6.10 Hard Water Areas
1. If the area of the installation is recognised as a
HARD WATER AREA then a suitable device
should be fitted to treat the mains water supply to
the boiler.
Boiler
Other Tap
Outlets
Expansion
Vessel
To Hot
Taps
Check
Valve
Pressure
Reducer Valve
Stop Tap
Fig. 6

7.0 Site Requirements
14
7.1 Information
1. The installation must be carried out by a CORGI
Registered Installer or other registered competent
person and be in accordance with the relevant
requirements of the current GAS SAFETY (Installation
and Use) REGULATIONS, the BUILDING REGULATIONS
(Scotland)(Consolidation), the LOCAL BUILDING
REGULATIONS, the current I.E.E. WIRING REGULATIONS
and the bye laws of the LOCAL WATER UNDERTAKING.
Where no specific instruction is given reference
should be made to the relevant BRITISH
STANDARD CODES OF PRACTICE. For Ireland
install in accordance with IS 813 “INSTALLATION OF
GAS APPLIANCES”.
7.2 B.S. Codes of Practice
Standard Scope
BS 6891 Gas Installation.
BS 5546 Installation of hot water supplies for
domestic purposes.
BS 5449 Part 1 Forced circulation hot water systems.
BS 6798 Installation of gas fired hot water boilers.
BS 5440 Part 1 Flues.
BS 5440 Part 2 Ventilation.
BS 7074 Expansion vessels and ancillary
equipment for sealed water systems.
BS 7593 Treatment of water in domestic hot water
central heating systems.
WARNING - The addition of anything that may
interfere with the normal operation of the
appliance without express written permission
could invalidate the appliance warranty and
infringe the GAS SAFETY (Installation and Use)
REGULATIONS.
7.3 Clearances (Figs. 7 & 8)
1. A flat vertical area is required for the installation
of the boiler.
2. These dimensions include the necessary
clearances around the boiler for case removal,
spanner access and air movement. Additional
clearances may be required for the passage of
pipes around local obstructions such as joists
running parallel to the front face of the boiler.
7.4 Location
1. The boiler may be fitted to any suitable wall with the
flue passing through an outside wall or roof and
discharging to atmosphere in a position permitting
satisfactory removal of combustion products and
providing an adequate air supply. The boiler should be
fitted within the building unless otherwise protected by
a suitable enclosure i.e. garage or outhouse. (The
boiler may be fitted inside a cupboard-see Section 7.5).
2. If the boiler is sited in an unheated enclosure then it
is recommended to leave the ON/OFF Selector Switch
in the domestic hot water and central heating position
to give frost protection.
3. If the boiler is fitted in a room containing a bath or
shower reference must be made to the current I.E.E.
WIRING REGULATIONS and BUILDING REGULATIONS. If the
boiler is to be fitted into a building of timber frame
construction then reference must be made to the
current edition of Institute of Gas Engineers Publication
IGE/UP/7 (Gas Installations in Timber Framed
Housing).
200mm Min
780mm
450mm
200mm Min
5mm Min
5mm Min
5mm Min
450mm Min
For Servicing
Purposes
Fig. 7
Fig. 8
In Operation

7.0 Site Requirements
15
7.5 Ventilation of Compartments
1. Where the appliance is installed in a cupboard
or compartment, no air vents are required.
2. BS 5440: Part 2 Clause 4.2 refers to room
sealed appliances installed in compartments. The
appliance will run sufficiently cool without
ventilation.
7.6 Gas Supply
1. The gas installation should be in accordance
with BS6891.
2. The connection to the appliance is a 22mm
copper tail located at the rear of the gas service
cock (Fig. 9).
3. Ensure that the pipework from the meter to the
appliance is of adequate size. Do not use pipes of
a smaller diameter than the boiler gas connection
(22mm).
7.7 Electrical Supply
1. External wiring must be correctly earthed,
polarised and in accordance with current I.E.E.
WIRING REGULATIONS.
2. The mains supply is 230V ~ 50Hzfused at 3A.
NOTE: The method of connection to the
electricity supply must facilitate complete
electrical isolation of the appliance.
Connection may be via a fused double-pole
isolator with a contact separation of at least
3mm in all poles and servicing the boiler and
system controls only.
Fig. 9
Gas Service Cock

7.0 Site Requirements
16
7.8 Flue
1. The flue terminal position must be in
accordance with the current editions of B.S.
5440 Part 1, and either Part J of the Building
Regulations England and Wales or Part F of
the Building Standards (Scotland)
Regulations as appropriate.
2. If the terminal discharges onto a pathway or
passageway, check that combustion products will
not cause a nuisance and that the terminal will
not obstruct the passageway.
3. If a 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 provided.
Terminal Position with Minimum Distance (Fig. 11) (mm)
A Directly below an openable window, air vent or any other
ventilation opening. 300
B Below gutter, drain/soil pipe. 150
C Below eaves. 200
D Below a balcony/car port roof. 200
E From vertical drain pipes and soil pipes. 150
F From internal or external corners. 300
G Above adjacent ground or balcony level. 300
H From a surface facing a terminal. 600
I Facing a terminals. 1200
J From opening (door/window) in carport into dwelling. 1200
K Vertically from a terminal on the same wall. 1500
L Horizontally from a terminal on the same wall. 300
M Above an opening, air brick, opening window etc. 300
N Horizontally to an opening, air brick, opening window etc. 300
L
G
G
E
J
D
K
G
AAD
F
H,I
B,C
F
Likely flue positions requiring
a flue terminal guard
M
N
Fig. 11
300 min
Terminal
Assembly
Top View Rear Flue
Property Boundary Line
NOTE: Scotland Only - The distance from a
fanned draught appliance terminal installed at
right angles to a boundary may not be less
than 300mm in accordance with the diagram
below

7.0 Site Requirements
17
7.9 Flue Dimensions
The standard horizontal flue kit allows for flue
lengths between 100mm and 1m from elbow to
terminal (Fig. 12).
The maximum permissible equivalent flue
length is: 4 metres.
NOTE: Each additional 45°of flue bend will
account for an equivalent flue length of 0.5m.
eg. 45°= 0.5m, 90°= 2 x 45°= 1m etc.
7.10 Flue Terminal Trim
1. Once the flue is secure the trim can be fitted if
required.
2. Remove the protective backing from the
adhesive seal. Apply the seal to the rear of the
trim flange (Fig. 13).
3. Locate the trim over the flue terminal and push
it back to the wall to compress the seal (Fig. 14).
7.11 Terminal Guard (Fig. 15)
1. When codes of practice dictate the use of
terminal guards, they can be obtained from most
Plumbers’and Builders’Merchants.
2. There must be a clearance of at least 50mm
between any part of the terminal and the guard.
3. When ordering a terminal guard, quote the
appliance name and model number.
3. The flue terminal guard should be positioned
centrally over the terminal and fixed as
illustrated.
Fig. 12
Fig. 15
100mm 1m
Fig. 14
Fig. 13
Flue Trim
Adhesive Seal

18
7.0 Site Requirements
7.12 Flue Options
1. The Potterton Performa 28i can be fitted with
flue systems as illustrated.
2. The standard flue Kit No 247719 is suitable
only for horizontal applications.
3. Maximum permissible equivalent flue lengths
are:-
Concentric 4m
Vertical 4m
Vertical Two-Pipe 12m
4. Any additional “in line”bends in the flue system
must be taken into consideration. Their equivalent
lengths are:-
Concentric Pipes:
45°bend 0.5 metres
90°bend 1.0 metres
Twin Flue Pipe
45°bend 0.25 metres
90°bend 0.50 metres
The elbow supplied with the standard horizontal
flue is not included in any equivalent length
calculations
5. The illustrations opposite show examples of
maximum equivalent lengths.
6. Instructions for guidance and fitting are
included in each kit where appropriate.
Horizontal
Flues
Vertical
Flues
Vertical
Flues
(Twin Pipe)
Maximum Length = 3m inc. 2 x 45°bends
Maximum Length = 11m
inc. 4 x 45°bends
Maximum Length = 2m
inc. 2 x 90°bends

8.0 Installation
19
8.1 Initial Preparation
The gas supply, gas type and pressure must
be checked for suitability before connection
(see Section 7.6).
1. After considering the site requirements
(see Section 7.0) position the fixing template
(Fig. 16) on the wall ensuring it is level both
horizontally and vertically.
2. Mark the position of the two most suitable
fixing slots for the wall plate and boiler lower
fixing holes. It is preferable to use the horizontal
fixing slots.
3. Mark the position of the centre of the flue hole
(rear exit). For side flue exit, mark as shown.
4. Note the shaded area on the template.
Pipework cannot be routed upwards behind
the boiler.
5. If required, mark the position of the gas and
water pipes. Remove the template.
6. Cut the hole for the flue (minimum diameter
107mm).
7. Drill the wall as previously marked to accept
the wall plugs supplied. Secure the wall plate
using the fixing screws.
8. Using a spirit level ensure that the plate is
level before finally tightening the screws.
9. Connect the gas and water pipes to the valves
on the wall plate using the copper tails supplied.
Ensure that the sealing washers are fitted
between the connections.
8.2 Flushing
1. Connect a tube to the central heating flow or
return pipe (Fig. 17).
2. Flush thoroughly (see System Details, Section
6.2).
3. The use of the optional Filling Loop Kit (Part
No. 248221) will simplify the flushing and
soundness checking.
8.3 Preparing The Boiler
1. Remove all packaging.
2. Stand the boiler on its base by using the rear
lower edge as a pivot.
NOTE: A small amount of water may drain
from the boiler when the plastic caps are
removed from the boiler connections.
Fig. 16
Fig. 17
FIXING
TEMPLATE
5 mm Minimum
Side Clearance
5 mm Minimum
Side Clearance
Horizontal Side Flue
Centre Line
107mm Dia Minimum
Aperture For Flue Tube
200 mm
Minimum
Clearance
200 mm
Minimum
Clearance
Profile of
Outercase
Vertical Flue
Centre Line
General
Area For
Electrical
Supply
Hot Water
Outlet
(15mm)
Cold Water
Inlet
(15mm)
Heating
Return
(22mm)
Heating
Flow
(22mm)
Pressure Relief
Valve
(15mm)
Gas
Inlet
(22mm)
95 mm 65 mm
Boiler Mounting Bracket Fixing Slots
Drill 8 mm diameter x 50 mm deep
65 mm 65 mm 65 mm 65 mm
Boiler Lower Fixing Holes
Drill 8 mm diameter x 50 mm deep
IMPORTANT
Pipework cannot be
rear routed upwards behind the boiler.
Keep pipework, electrical cables and clips clear of
all shaded areas to allow the correct fitting of the boiler
Performa 28i
Fixing Template
Appliance Wall Plate
190mm
For Side Flue Exit
Central Heating Return
Flushing Tube Wall Plate
Filling Loop

8.0 Installation
20
8.4 Fitting The Boiler
1. Remove the sealing caps from the boiler
connections.
2. Lift the boiler using the lower edges. Engage
the slots at the top rear of the boiler on the wall
plate (Fig. 18).
3. Insert the sealing washers between the valves
and pipes on the wall plate and the boiler
connections. The rubber washers must be
used on the gas connection.
4. Tighten all the connections.
5. Secure the boiler chassis to the wall plate
using the two screws provided.
8.5 Fitting the Pressure Relief
Discharge Pipe (Fig. 19)
1. Remove the discharge pipe from the kit.
2. Determine the routing of the discharge pipe in
the vicinity of the boiler. Make up as much of the
pipework as is practical, including the discharge
pipe supplied.
3. The pipework must be at least 15mm diameter
and run continuously downwards to a discharge
point outside the building. See section 6.7 for
further details.
4. Utilising one of the sealing washers, connect
the discharge pipe to the adaptor and tighten the
nut.
5. Complete the discharge pipework and route it
to the outside discharge point.
IMPORTANT: Make all soldered joints before
connecting to the pressure relief valve.
Fig. 19
Fig. 18
Pressure Relief Valve
Wall Plate
Discharge Pipe