Potterton Performa 28i Guide de l'utilisateur

Installation and

Servicing Instructions

Please leave these instructions with the user

Performa 28i

Gas Fired Wall Mounted Combination Boiler

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.

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

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

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

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.

12 11

10 9

20 21 22 10 9

bar

30°40°50°60°70°80°

Reset

Preheat

Off

30°40°50°60°70°80°

23 24 25 26 27 28

29 30 31 32

3.0 Appliance Operation

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

20 22

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

20 22

Domestic Hot Water - Preheat Mode

Fig. 3

3.0 Appliance Operation

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

20 22

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

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 %

200 400 600 800 1000 1200

0.5

1.5

2.5

3.5

Metre wg

l/h

Pump - Available Head

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

14.8

5.0 Dimensions and Fixings

Dimensions

A780mm

B345mm

C450mm

D107mm ØMin.

E200mm

F190mm

G143mm

360°Orientation

Tube Ø100mm

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

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