Ravenheat Little Star LS 80, Little Star LS 80 T, Little Star LS 100, Little Star LS 100 T Installation And Servicing Instructions

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ELECTRONIC IGNITION - AUTOMATIC MODULATING BOILER

WITHOUT TIMER
LS 80 G.C. No4758129 (NAT.) - 4758131 (LPG)
LS 100 G.C. N

NATURAL GAS (G20) -I

Listed by The United Kingdom Water

o

4758133 (NAT.) - 4758135 (LPG)

2H - II2H3+

LPG (G30 - G31) - I

Fitting Byelaws Scheme

3+-II2H3+

Fanned Combination Boiler

WITH TIMER

LS 80T G.C. No4758130 (NAT.) - 4758132 (LPG)

o

LS 1OOT G.C. N

NATURAL GAS (G20) - I

LPG (G30 - G31) - I

4758134 (NAT.) - 4758136 (LPG)

2H

-

II

2H3+

3+-II2H3+

INSTALLATION AND SERVICING INSTRUCTIONS

TO BE LEFT WITH USER

Technical and illustrative data are not binding and can be modified without prior notice.
The descriptions and illustrations in the present booklet are for guideline purposes only.

RAVENHEAT MANUFACTURING LTD., CHARTISTS WAY, MORLEY, LEEDS, LS27 9ET. -TELEPHONE [phone]

Supplied By www.heating spares.co Tel. [phone]

THE LITTLE STAR - AUTOMATIC MODULATING BOILER

FOR CENTRAL HEATING AND DOMESTIC HOT WATER

The new small super high efficiency turbo-modulating boiler is designed to meet domestic hot water
and central heating requirements at super high efficiency, unheard of only a few years ago.

POSITION

The appliance is extremely versatile as it can be fitted in almost any room. The appliance is room sealed,
there is no contact between combustion chamber and living accommodation. This guarantees maximum
safety and efficiency. Indeed, our depression/combustion front cover has been designed to fit achieving
maximum air tight seal which ensures maximum efficiency and safety - something which Ravenheat take
great pride in.

Each boiler has been designed and manufactured in our modern plant to exacting IS0 9001 discipline,
all boilers carry full CE marking of approval. Technical sales and commercial service are available
throughout the UK and Europe. This product is guaranteed by Ravenheat Manufacturing, Chartists
Way, Morley, LEEDS, LS27 9ET. Telephone No [phone].

BASIC COMPONENTS - (See figure 1)

Guarantee is a full 12 months from date of purchase providing the appliance has been fitted in accor­dance with these instructions and relevant codes of practice.

MAJOR COMPONENTS

- Gas valve with flame modulator.

- Variable head pump suitable for any type of central heating system.

- Main burner with flame stabiliser designed to operate under all thermal conditions.

- Primary heat exchanger constructed from copper.

- Stainless steel plate heat exchanger for super high heat transfer to domestic hot water.

- High reliability diverter valve with ethylene propylene diaphragm permitting primary flow circu­ lation in the boiler during domestic hot water supply.

- Built in frost protection.

- Printed circuit board designed to connect to room stat and/or timer/frost stat.

- Aesthetically pleasing panels and controls.

- On/Off ball valves for shutting off gas central heating and domestic hot water circuits.

- Safety relief valve (for safety discharge).

- Programmable 7 day module with digital display (optional model).
All front panel controls not often used have been hidden behind a lift up flap. This means neat design
and easy clean panels.

.

COSHH - CONTROL OF SUBSTANCES HARMFUL TO HEALTH

IMPORTANT

This appliance contains materials that are indicated below.

It is the Users/Installers responsibility to ensure that the necessary personal protective clothing is worn

when handling, where applicable, the pertinent parts that contain any materials that could be inter­preted as being injurious to health and safety.

WARNING When installing the appliance, care should be taken to avoid any possibility of injury when

handling sheet metal parts.

GENERAL INFORMATION:

GLUES AND SEALANTS exercise caution - if these are still in liquid form.
INSULATION PADS, CERAMIC FIBRE may be harmful if inhaled, may be irritating to skin, eyes, nose
and throat.
When handling keep dust generation to a minimum, avoid inhaling and contact with skin or eyes.
When disposing of the product keep dust generation to a minimum and ensure that parts are securely
wrapped.

When servicing avoid inhalation by using a vacuum cleaner or in conjunction with other tools,

After handling wash hands and other exposed parts,

RAVENHEAT use only high quality material for production of this product, in an effort to protect the
environment components should be re-cycled,

3

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SECTIONS:

2

3
4
5
6
7
8

9
10
11

GENERAL LAYOUT

Fig. 1

TABLE OF CONTENTS

INTRODUCTION
DESIGN PRINCIPLES AND

OPERATING SEQUENCE
TECHNICAL DATA
GENERAL REQUIREMENTS

INSTALLATION
COMMISSIONING
SERVICING INSTRUCTIONS

FAULT FINDING

ELECTRICAL SYSTEM DIAGRAM

EXPLODED PARTS DIAGRAM

LIST OF SPARE PARTS

PAGE:

6

6

8-9-10

11
16
25
30
43
45
47

.

48

KEY

1 - Heat exchanger
3 - Burner
4 - Ignition electrode
5 - Flue restriction ring
7 - Ignition board
9 - Detection electrode

11 - Frame
12 - Modulating gas valve
15 - Heating control

16 - Hot water control
17 - D.H.W. sensor
18 - Water pressure switch (heating circuit)
22 - Overheat cut off thermostat
23 - Safety relief systems
24 - Three way valve
26 - Auto air vent valve
28 - Air pressure switch
29 - Circulation pump

30 - Water pressure gauge
33 - Main switch
34 - C.H. Sensor
36 - Fan
37 - Expansion tank
38 - Sealed chamber
45 - Combustion chamber
50 - Flue gas exhaust hood

105 - Timer

4

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OPERATING

Fig. 2

SCHEME

KEY

1 - Heat exchanger

2 - Heat exchanger for D.H.W. water
3 - Burner
4 - Ignition electrode
5 - Flue restriction ring
6 - Elbow header
7 - Electronic ignition

8 - Twin header

9 - Detection electrode

10 - Straight header
12 - Modulating gas valve
15 - Heating control potentiometer
16 - Hot water control potentiometer
17 - Water pressure switch
18 - Overheat cut-off thermostat
20 - Gas service cock
21 - Compression ball valves
23 - Safety relief system

24 -Three way valve
26 - Auto air vent valve
28 - Pressure switch
29 - Circulating pump
30 - Water pressure gauge

36 - Fan
37 - Expansion tank
38 - Sealed chamber

5

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SECTION 1 INTRODUCTION

2.2.6

Central heating mode

1.1

The Ravenheat boiler is for the use of cen-

tral and domestic hot water combined in
one unit.

It is fitted with an automatic domestic hot
water priority valve.
A winter/summer selector switch is fitted to
the left hand side of control panel. With the
only summer position being for domestic hot
water.
Winter position being for central heating
with domestic hot water priority. The boiler

is equipped with a front cover which can be

removed for servicing. The data badge with
technical data is placed on front cover.

1.2 Fig. 1 Illustrates the general layout of

components.

Fig. 2 Illustrates the operating principles
described in section 2.

SECTION 2

2.1

2.2

DESCRIPTION OF CONTROL SYSTEM

AND SEQUENCE OF OPERATION

Domestic hot water mode

When the appliance is in rest mode with the

mains neon switch on. Switch the sum-

mer/winter switch in the summer Position,

making sure the heating circuit is charged
with water (above 1 bar). When the domes­tic hot water tap is turned on, the boiler will
function in the following sequence:

2.2.7

2.2.8

2.2.9

2.3

2.3.1

If the switch is positioned on winter with a
demand for heat to supply radiators, etc.
With heating circuit fully charged so as to
operate the low water sensor device the

boiler will start in the same way as domes­tic hot water mode but with slightly differing
time delay in that it will start on minimum
and remain at this level for about 1 minute,
after which the flame will lift to its maximum
setting as governed by a potentiometer
range rates the heating circuit between
maximum and minimum power.

On the control panel are mounted two
potentiometers (thermostats) these control
the temperature. One is for domestic hot
water and the other for heating.

The boiler is fitted with an anti-cycling
device on the control board. This delays the
boiler from re-firing over a 2.5 minute period
when in heating mode. The domestic hot
water will always take priority and is unaf­fected by the anti-cycling device.

GENERAL FUNCTION

Central Heating Mode

A potentiometer is installed on the electric
circuit board permits regulation of the boiler
to partial heating requirements, between
the factory setting.

2.2.1

2.2.2

2.2.3

2.2.4

2.2.5

The pump starts.
The control board sensors.
The fan operates via the pressure switch and
sends a signal back to the ignition board that
the fan is running at maximum speed.

The spark ignition system is powered which

in turn commences the spark igniter to
operate and light the burner.
At this point the ignition board opens the gas
valve to light the burner.

When the electrode/sensor senses the sig-

nal the burner the spark igniter stops.

From the minimum gas rate setting the boil­er increases to the maximum permissible

pressure over a period of 3 to 4 seconds and
will remain at its maximum required power

until its maximum regulated temperature.

When the domestic hot water tap is closed
the diverter valve goes back into rest mode,

the main burner is shut down. The pump

and fan are also switched off, the pressure

switch returning to its rest mode.

2.3.2

2.3.3

2.3.4

2.3.5

2.3.6

2.3.7

Air is drawn by the fan for combustion.

The fan also forces exhaust gas through the
flue to the outside, this creates a lesser
pressure in the sealed combustion cham-

ber, thus sucking in combustion air, through
the inlet duct.

The boiler water temperature is automati­cally controlled by a built in thermostat.

Interior space temperature is set by the

room thermostat to be installed in the heat-

ing system. The boiler already carries con-

nection terminals for this thermostat, as

well as for a timeclock. The burner will con-

tinue to operate until it is stopped by the

timer or one of the thermostats.

When the internal C.H. temperature sensor
intervenes the main burner shuts down. The
fan stops but the pump continues to oper­ate.

When the room thermostats intervene the
main burner shuts down. The fan stops and
the pump turns off.

6

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2.4

2.4.1

2.4.2

2.4.3

Domestic hot water mode,

The heat exchanger in the D.H.W. circuit is
a stainless steel plate heat exchanger water
to water, and domestic water is heated by
converting the water in the central heating
circuit. The transference of heat is very high
because the two fluids move in a counter
direction flow to each other.
Switch la Fig. 50 in the winter position.
When a hot water tap is turned on a
diaphragm diverter valve excludes the cen-

tral heating circuit, the boiler automatically until the room thermostat/time clock

modulates to maintain the domestic hot
water at a constant temperature.
Water temperature can be regulated using
the D.H.W. thermostat located on the front
control panel.
When domestic hot water is being drawn
the main burner and pump perform as they
do during central heating except that the

burner is commanded by the D.H.W. ther-

mostat.

OVERALL DIMENSION

2.4.4

2.4.5

3.1

3.1.2

When D.H.W. is no longer called for the boil­er automatically returns to the central heat­ing mode.
Switch la Fig. 50 in the summer position.
The boiler functions like an automatic gas
hot water heater. When D.H.W. is no longer

required the main burner fan and pump
immediately turn off.
This also takes place when switch

la Fig. 50 is on winter if there is no demand
for heat to the central heating system or

demands for heat to the central heating cir­cuit.

SAFETY DEVICE

In both central heating and domestic hot
water mode safe operating is ensured by:

- A differential pressure switch which shuts
off the main burner if the fan stops or the
flue or combustion air intake duct is
obstructed.
An overheat cut off thermostat set slightly

higher than the high limit thermostat acts to
turn off the burner to resetable “lockout“

(Fig. 50) item 3.

3.1.3 A safety valve fitted on the
central heating circuit set at
43 psi (3 bar).
A heating circuit (low water)

7

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SECTION 3 TECHNICAL DATA

TABLE 1

NOMINAL HEAT INPUT NET QMS
MINIMUM HEAT INPUT NET

NOMINAL HEAT OUTPUT
MINIMUM HEAT OUTPUT

GAS RATE
AFTER 10 MINUTES

INLET PRESSURE 20 mbar

BURNER PRESSURE C.H.

MAIN BURNER INJECTORS Nr. 13 x 1.35

ELECTRICAL SUPPLY

POWER CONSUMPTION 150w
EXTERNAL FUSE RATING 3 A
INTERNAL FUSE

DRY WEIGHT
WATER CONTENT C.H.
WATER CONTENT

GAS SUPPLY CONNECTION

FLOW CONNECTION C.H.

RETURN CONNECTION C.H.

INLET CONNECTION D.H.W.
OUTLET CONNECTION D.H.W.

SAFETY DISCHARGE C.H.

NATURAL GAS (G 20)

max
min

max
min

230 V - 50 HZ

250 mA 2 A

39.3 kg

1.5 litre

0.5 litre

I

2H

26.1 kW

13.5 kW

24.1 kW

11.6 kW

3

/h

2.6 m

1.3 m3/h

8.1 mbar

1.5 mbar

(20 mm to BS 4265)

15 mm compression isolating valve
22 mm compression isolating valve
22 mm compression isolating valve
15 mm compression isolating valve
15 mm copper pipe
15 mm copper pipe

MAX COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL

SEALED WATER SYSTEM C.H.

MAX PRESSURE PHS

MINIMUM WORKING PRESSURE

6 LITRES EXPANSION VESSEL PRE-CHARGE-PRESSURE 0.5 bar

CENTRAL HEATING OPERATING TEMPERATURE MAX 85 °C

MIN 45 °C

DESIGN FLOW RATE 1033 l/h 20 °C RISE

MINIMUM FLOW RATE C.H. 650 l/h

D.H.W. FLOW RATE 30 °C rise 11.5 l/min
D.H.W. FLOW RATE 35 °C rise 9.9 l/min
D.H.W. FLOW RATE 40 °C rise

D.H.W.TEMPERATURE

BURNER PRESSURE D.H.W. max 8.1 mbar
Q

MW

Input Net

D.H.W. PRESSURE
D.H.W. PRESSURE PMW

D.H.W. MINIMUM FLOW RATE3 l/min (0.66 gals/min)

FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers

DESTINATION: AT. CH. DK. ES. FI. GB. IE. IT. PT. SE.

FLUE TYPE - C

CATEGORY I

SEDBUK RATING
C 12 C 32 = ORIFICE PLATE DM 77

C52=

12 C 32 C 52

2H

ORIFICE PLATE DM 75

8.6 l/min (2.0 gals/min)

max 65°C min 35°C

max 26.1 kW

max 10 bar (147 p.s.i.)
min 0.8 bar (11.8 p.s.i.)

79.61 %

BAND D

2.5 bar

0.5 bar

10 °C inlet temperature

min 1.5 mbar
min 13.5 kW

NOX 2

85 LITRE

8

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SECTION

3 TECHNICAL DATA

TABLE 1/A

NOMINAL HEAT INPUT NET QMS
MINIMUM HEAT INPUT NET

NOMINAL HEAT OUTPUT
MINIMUM HEAT OUTPUT

GAS RATE max G 31

AFTER 10 MINUTES min

INLET PRESSURE 37 mbar G 31

BURNER

PRESSURE

MAIN

ELECTRICAL SUPPLY 230 V ­POWER CONSUMPTION
EXTERNAL FUSE RATING
INTERNAL FUSE

DRY WEIGHT
WATER CONTENT C.H.
WATER CONTENT OHW

GAS SUPPLY CONNECTION

FLOW CONNECTION C.H.

RETURN CONNECTION C.H.

INLET CONNECTION D.H.W.
OUTLET CONNECTION D.H.W.

SAFETY DISCHARGE C.H.

BURNER INJECTORS Nr. 13 x

max
min

G 31

150 W
3A
250 mA - 2 A

39.3 kg

1.5 litre

0.5 litre

LPG (G 30 - G 31) I

26.1 kW

13.5 kW

24.1 kW

11.6 kW

0.95

m3/h

0.5

m3/h

28

-

30

35.4 mbar

9.6 mbar

0.75

50 HZ

(20 mm to

15 mm compression isolating valve
22 mm compression isolating valve
22 mm compression isolating valve

15 mm compression isolating valve
15 mm copper pipe

15 mm copper pipe

3+

mbar

G

30

G

30

G

30

BS 4265)

0.79

0.4

27.3

6.6

m3/h

m3/h

mbar
mbar

MAX COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL

SEALED WATER SYSTEM C.H.

2.5

MAX PRESSURE PMS
MINIMUM WORKING PRESSURE
6

LITRES

CENTRAL HEATING OPERATING TEMPERATURE MAX 85 °C

DESIGN FLOW RATE DHW 1033 I/h 20 °C RISE
MINIMUM FLOW RATE C.H./650 Lts/h (111 gals/h)

D.H.W. FLOW RATE 30 °C rise D 11.5 I/min
D.H.W. FLOW RATE 35 °C rise

D.H.W. FLOW RATE 40 °C rise

D.H.W.TEMPERATURE

BURNER PRESSURE
QMW Input Net

D.H.W. PRESSURE
D.H.W. PRESSURE PMW
D.H.W. MINIMUM FLOW RATE3 l/min

FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers

DESTINATION: BE. CH. ES. FR. GB. IE. IT. PT.

FLUE TYPE C12 - C32 - C52

CATEGORY l

SEDBUK RATING

C12 C32 ORIFICE PLATE DM 76
C52 =

EXPANSION

3+

ORIFICE PLATE DM 74

VESSEL

D.H.W. max 8.1 mbar

PRE-CHARGE-PRESSURE

MIN 45 °C

9.9 I/min

8.6 I/min

max 65 °C
min 35 °C

max 26.1 kW

max 10 bar
min 0.8 bar

81.88 %

BAND D

bar

0.5 bar

0.5 bar

10 °C inlet temperature

min 1.5 mbar
min 13.5 kW

NOX 2

85 LITRES

9

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SECTION 3 TECHNICAL DATA

TABLE 3

LS 100 (T)

NATURAL GAS (G 20) I 2H - II 2H3+

NOMINAL HEAT INPUT NET QMS
MINIMUM HEAT INPUT NET

NOMINAL HEAT OUTPUT
MINIMUM HEAT OUTPUT

GAS RATE

max

AFTER 10 MINUTES min

31.4 kW

13.0 kW

29.0 kW

11.2 kW

3

3.2 m

/h

1.25 m3/h

INLET PRESSURE 20 mbar

BURNER PRESSURE C.H.

MAIN BURNER INJECTORS Nr. 15 x 1.25

ELECTRICAL SUPPLY
POWER CONSUMPTION
EXTERNAL FUSE RATING

max
min

230V-50HZ
150w
3A

12.5 mbar

1.4 mbar

,

INTERNAL FUSE 250 mA 2 A (20 mm to BS 4265)

DRY WEIGHT

41.akg
WATER CONTENT C.H. 1.7 litre
WATER CONTENT

0.5 litre

GAS SUPPLY CONNECTION 15 mm compression isolating valve
FLOW CONNECTION C.H. 22 mm compression isolating valve
RETURN CONNECTION C.H. 22 mm compression isolating valve
INLET CONNECTION D.H.W. 15 mm compression isolating valve
OUTLET CONNECTION D.H.W.

15 mm copper pipe

SAFETY DISCHARGE C.H. 15 mm copper pipe

MAX COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL

SEALED WATER SYSTEM C.H.
MAX PRESSURE PHS
MINIMUM WORKING PRESSURE

2.5 bar

0.5 bar

6 LITRES EXPANSION VESSEL PRE-CHARGE-PRESSURE 0.5 bar

CENTRAL HEATING OPERATING TEMPERATURE MAX 85

o

C MIN 45 oC

DESIGN FLOW RATE D.H.W. 1247 l/h 20°C

MINIMUM FLOW RATE C.H. 650 I/h

D.H.W. FLOW RATE 30oC rise 13.9 l/min
D.H.W. FLOW RATE 35
D.H.W. FLOW RATE 40

D.H.W.TEMPERATURE max 65

BURNER PRESSURE D.H.W. max 12.5 mbar
Q

MW

Input Net

D.H.W. PRESSURE

o

C rise 11.9 l/min

o

C rise

10.4 l/min (2.0 gals/min) 10oC inlet temperature

o

C min 35oC

max 31.4 kW

max 10 bar (147 p.s.i.)

min 1.4 mbar
min 13.0 kW

D.H.W. PRESSURE PMW min 0.8 bar (11.8 p.s.i.)
D.H.W. MINIMUM FLOW RATE

3 l/min

FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers

DESTINATION: AT. DK. FI. SE.

DESTINATION: GB. IE. CH. ES. IT. PT

CATEGORY I

CATEGORY II

2H

2H3+

FLUE TYPE - C12 - C32 - C52

SEDBUK RATING

79.61 %

BAND D

C12 C32 ORIFICE PLATE DM 79
c52 =

ORIFICE PLATE DM 78

85 LITRE

NOX4

10

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SECTION 3 TECHNICAL DATA

TABLE 4

LS 100 (T)

LPG (G 30 - G 31) II 2H3+ -I 3+

NOMINAL HEAT INPUT NET QMS
MINIMUM HEAT lNPUT NET

NOMINAL HEAT OUTPUT

GAS

RATE

After 10 minutes

max

min

INLET PRESSURE

BURNER PRESSURE

C.H.

max
min

MAIN BURNER INJECTORS Nr. 15 x 0.75

ELECTRICAL SUPPLY

POWER CONSUMPTION

EXTERNAL FUSE RATING

INTERNAL FUSE

DRY WEIGHT
WATER CONTENT C.H.
WATER CONTENT OHW

230V-50HZ

150w
3A
250 mA - 2 A

41.8 kg
1 .7 litre

0.5 litre

GAS SUPPLY CONNECTION
FLOW CONNECTION C.H.
RETURN CONNECTION C.H.
INLET CONNECTION D.H.W.

OUTLET CONNECTION D.H.W.

SAFETY DISCHARGE C.H.

31.4 kW

13.0 kW

29.0 kW

G

37 mbar G

31

31

G

31

1.24

m3/h G

0.53 m3/h

28 30 mbar G 30

35.4 mbar

6.1 mbar

(20 mm to BS 4265)

15 mm compression isolating valve
22 mm compression isolating valve
22 mm compression isolating valve

15 mm compression isolating valve

15 mm copper pipe

15 mm copper pipe

30

0.95

m3/h

0.40 m3/h

G

30

27.2

mbar

4.7 mbar

MAX COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL

SEALED WATER SYSTEM C.H.

MAX PRESSURE PMS 2.5 bar
MINIMUM WORKING PRESSURE 0.5 bar

6 LITRES EXPANSION VESSEL PRE-CHARGE-PRESSURE 0.5 bar

CENTRAL HEATING OPERATING TEMPERATURE

o

DESIGN FLOW RATE DHW 1247 I/h 20

C RISE

MAX 85

o

C

MIN 45°C

MINIMUM FLOW RATE C.H. 650 L/h

D.H.W. FLOW RATE 30oC rise 13.9 l/min
D.H.W. FLOW RATE 35
D.H.W. FLOW RATE 40

D.H.W. TEMPERATURE

BURNER PRESSURE D.H.W.

QMW Input Net

D.H.W. PRESSURE
D.H.W. PRESSURE PMW

o

C rise 11.9 I/min

o

C rise 10.4 l/min

max 65 oC

max
mln

max 31.4 kW

max 10 bar (147 p.s.i.)
min 0.8 bar (11.8 p.s.i)

10oC inlet temperature

min 35

G 31

o

C

35.4 mbar

6.1 mbar

min 13.0 kW

D.H.W. MINIMUM FLOW RATE 3 I/min

FLUE OUTLET NOM. DIAMETER 100 mm

DESTINATION: GB. IE. CH. ES. IT. PT.

DESTINATION: BE. FR.

specially supplied with boilers

CATEGORY ll

CATEGORY l

2H3+

3+

FLUE TYPE C12 C32 C52

SEDBUK RATING

81.88 %

BAND D NOX 4

C12 - C32 = ORIFICE PLATE DM 78
c52 =

ORIFICE PLATE DM 77

G 31

85 LITRES

27.2 mbar

4.7 mbar

11

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SECTION 4

4.0

SAFETY

Gas Safety (Installation and Use)
Regulations, 1994 and amended 2000.

It is law that all gas appliances are installed
and serviced by a CORGI registered in-

staller in accordance with the above regula­tions and these installation instructions. All
CORGI registered installers carry a CORGI

I.D. card and have a registration number.

Both should be recorded in your boiler log recommended by Ravenheat in writing. If in
book. You can check your installer by calling
CORGI direct on: 01256 732300. Failure to

install appliances correctly could lead to
prosecution. It is in your own interest, and
that of safety, to ensure the law is complied the certification and the normal appliance
with. Check the boiler and flue is the correct warranty. It could also infringe the Gas
type for Installation. Safety regulations and the above regula­The installation of the boiler MUST be in ac- tions.
cordance with the latest I.E.E. (BS 7671)
Wiring Regulations, local building regula- NOTE: The Ravenheat LITTLE STAR com­tions, bye-laws of the local water authority, bination boiler has been tested and exam­the building regulations and the Building ined by Advantica Technologies Ltd, and is
Standards (Scotland) and any relevant re- certified to comply with PrEN 483 and
quirements of the local authority.

4.1

GENERAL INFORMATION taken in any way as overriding statutory

Both the user and the manufacturer rely heav-

ily on the installer, whose job it is to install the
combination boiler and connect it to a correct-

ly designed heating system. Acquaint yourself
with the British Standards concerning installa­tion requirements. If you need advice on any

points your Ravenheat Technical Services Of­fice would be pleased to help. It is recom-

mended that tools suitable for brass fittings tion should be within the building, unless

are used, and have a capability to accomo- otherwise protected by a suitable enclosure.

date hexagon sizes up to 50 mms.

CODES OF PRACTICE/Ref: Documents

Detailed recommendations are contained in
the following British Standard Codes of

Practice:

BS. 6891

BS. 6798

BS. 5449

BS. 5546

BS. 5440:1

BS. 5440:2 Ventilation (for gas appliances of

GENERAL REQUIREMENTS

Low pressure installation pipes.

Installation of gas fired hot wa­ter boilers of rated input not ex­ceeding 60 kW.

Forced circulation hot water
systems.

Installation of gas hot water

supplies domestic purposes

(2nd Family Gases).

Flues (for gas appliances of rated

input not exceeding 60 kW).

rated input not exceeding 60 kW).

DD 189:1990 Discharge of condensate

The manufacturer’s notes must NOT be tak­en, in any way, as overriding statutory oblig­ations.

IMPORTANT.These appliances are CE cer­tificated for safety and performance. It is,
therefore, important that no external control
devices e.g. flue dampers, economisers
etc., are directly connected to this appli­ance unless covered by these Installation
and Service Instructions or as otherwise

doubt please enquire.

Any direct connection of a control device
not approved by Ravenheat could invalidate

BS EN 625.
Manufacturers instructions must NOT be

obligations.
If in doubt on any point please consult
Ravenheat Manufacturing Ltd.

4.2 LOCATION OF BOILER

4.2.1

Siting of Ravenheat Little Star Combi Boiler
must be as follows. The position of installa-

Adequate space for installation, servicing
and air circulation around boiler must be al­lowed for.
The Ravenheat LS 80 (T) and LS 100 (T)
Combi Boiler must be fitted on a flat and ver­tical wall capable of adequately supporting
the weight of the boiler and any ancillary
equipment.
The appliance may be installed on a com­bustible wall subject to the requirements of
the Local Authority and Building Regulations.

LPG versions of this appliance shall not
be installed in cellars or basements.

4.3

4.3.1

CLEARANCES AROUNDTHE APPLIANCE

LS 80 (T) - LS 100 (T)

Above 125 mm

Below 100 mm

Front 450 mm

Side 5 mm

Health & Safety Document No. 635

The Electricity at Work Regulations, 1989.

12

5 mm in front when installed in a cupboard

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4.4

4.4.1

IMPORTANT NOTICE

If the combination boiler iS to be fitted in a
timber framed building it should be fitted in
accordance with the British Gas Publication

Guide for Gas Installations in Timber Frame

Housing Reference DM2. If in doubt advice

must be sought from the local gas supplier.
The combination boiler may be installed in

any room or internal space, although partic-

ular attention is drawn to the requirements
of the current I.E.E. Wiring Regulations, and

in Scotland the electrical provisions of the

Building Regulations applicable in Scot-

land, with respect to the installation of the
combination boiler in a room or internal

space containing a bath or shower.
Where a room sealed appliance is installed

in a room containing a bath or shower, any

electrical switch or appliance control, utilis-

ing mains electricity should be so situated

that it cannot be touched by a person using

a bath or shower.

A compartment used to enclose the combi-

nation boiler MUST be designed and con-

structed specifically for this purpose. An ex-

isting cupboard, or compartment, may be

used provided it is modified accordingly.

Samples of the LITTLE STAR combination

boiler have been examined by Advantica

Technologies Ltd, and is certified to comply

with the essential requirements of the Gas

Appliance Directive 90/396/EEC, the Low

Voltage Directive 72/23/EEC and shows

compliance with the Electro Magnetic Com-

patibility Directive 89/336/EEC and are

therefore permitted to carry the CE Mark.

other appliances when they are in use at

the same time.

4.6

4.6.1 The terminal should be located where dis-

FLUE SYSTEM

persal of combustion products is not imped­ed and with due regard for the damage or
discolouration that might occur to building
products in the vicinity (see fig. 6).

The terminal must not be located in a place

where it is likely to cause a nuisance.

In cold and/or humid weather water vapour

may condense on leaving the flue terminal.

The effect of such steaming must be con-

sidered.sidered.

The terminal must not be closer than 25The terminal must not be closer than 25

mm. (1 in) to any combustible material. Formm. (1 in) to any combustible material. For
protection of combustibles. refer to BSorotection of combustibles. refer to BS

5440.1.
Where a flue terminal is installed less than

1000 mm. from a plastic, or painted gutter;

or 500 mm from painted eaves, an alumini-

um shield 1000 mm. long, should be fitted
to the underside of the gutter or painted
surface.

4.5

4.5.1

The appliance has been tested and ap­proved by the WRc as meeting the require-

ments of G3 and L of the Building regula-

tions and water Bylaws Scheme -Approved

Products.

GAS SUPPLY

A gas meter is connected to the service

pipe by the Local Gas Region or the Local
Gas Region contractor. An existing meter
should be checked preferably by the Gas
Region to ensure that the meter is ade­quate to deal with the rate of gas supply re­quired for all appliances it serves. Installa­tion pipes should be fitted in accordance
with BS 6891. Pipework from the meter to
the boiler must be of adequate size (22 mm)

min. To within at least 3 metre of the boiler
(15 mm) min. can then be used for remain-

ing pipe work to the appliance. A smaller
size than the boiler inlet gas connection
should not be used. The complete installa­tion must be tested for soundness as de-

scribed in the above Code.

N.B. if the gas supply for the boiler serves

other appliances ensure an adequate sup-

ply is available both to the boiler and the

IMPORTANT: The following notes are in-

tended for general guidance.

The boiler MUST be Installed so that the
terminal is exposed to external air.

It is important that the position of the termi­nal allows the free passage of air across it
at all times.

Minimum acceptable spacing from the ter­minal to obstructions and ventilation open­ing are specified in Fig. 6.

Note positions:

installation is possible with clearances less
than those specified in BS 5440, Part 1.

Due to the terminal design,

13

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4.8

WATER CIRCULATION (central heating)

NOTE:

4.6.2

4.7

4.7.1

Fig. 6A

The flue must be terminated in a place not

likely to cause a nuisance.

A concentric vertical flue kit is available for

flueing applications up to a maximum

height of 4 metres.
For further details see vertical flue installa-

tion instructions.

SUPPLY

AIR

The following notes are intended for gener-

al guidance.

The room sealed fan flued boiler does not

require a permanent air vent for combus­tion air supply.
Where installed in a cupboard or compart­ment ventilation is not required.

4.8.1

4.8.2

4.8.3

Detailed recommendations are given in BS
6798:1987/5449:1990 (for. smallbore and
microbore central heating systems). The fol­lowing notes are given for general guidance.

Pipework

Copper tubing to BS 2871 1.1.1971 is rec­ommended for water pipes. Jointing should
be either with capillary soldered or with
compression fittings.
Where possible pipes should have a gradi­ent to ensure air is carried naturally to air
release points and water flows naturally 16
drain taps. It should be ensured as far as
possible that the appliance heat exchanger
is not a natural collecting point for air
except where providing useful heat, pipes
should be insulated to prevent heat loss
and to avoid freezing. Particular attention
should be paid to pipes passing through
ventilated spaces in roofs and under floors.

The water through the appliance heat

exchanger circuit must exceed the min.

2.38 gals/min. (650 It/h) when the burner is
firing. It is important to ensure that this rate

is achieved when sections of the system

are shut off either manually or by automatic
controls.

ted to the system (15 mm min.) (Fig. 6A).

Therefore a by-pass must be fit-

If the volume of circulating water IS too low,

the boiler water temperature will rise too

rapidly. This could cause noise in the system
or even cause the safety thermostat to trip.

14

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4.8.4

Draining tap

These must be located in. accessible posi­tions to permit the draining of the whole
system. The taps must be at least 15 mm
nominal size and manufactured in accor-

dance with BS 2870 1980

Fig. 7

4.8.5

4.8.6

4.8.8

Air release points

These must be fitted at all high points
where air will naturally collect, and must be

sited to facilitate complete fitting of the sys­tem.

The appliance has an integral sealed
expansion vessel to accommodate the
increase of water volume when the system
is heated. It can accept up to 6 lts of
expansion water. If the appliance is con­netted to a system with an unusually high
water content, calculate the total expansion
and add additional sealed expansion
capacity as appropriate (Fig. 7).

In general modern systems will present no

problem.

Permissible methods of dilling

Primary flow and

return pipes

4.8.7

Mains water feed: central heating

There must be no direct connection to the

mains water supply, even through a non­return valve, without the approval of the
Local Water Authority.

Figure 1 depicts the requirements of Diagram R24.2a of
he Water Supply (Water Fittings) Regulations 1999.

15

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SIZING OF ADDITIONAL EXPANSION VESSELS: TABLE 3
Deduct from the value given in the table the 7 litre vessel supplied.

Note: This pressure can be increased up to 1.5 bar to suit static head situations, see item 10, other appliance instructions in the

SERVICING INSTRUCTIONS

B) Where fitting a make up vessel would be
difficult re - pressurisation of the system can
be done. See section on FILLING.

If the capacity of the central heating system
should exceed 85 litres, an additional ves­sel should be installed on the return to the
combination boiler from the heating system
(Fig. 7). Guidance on vessel sizing is given
in (Table 3).

Reference should be made to British Gas

Publications

<<Material and Installation
Specifications for Domestic Central Heating
and Hot Water >>. Draining taps should be at

It is most important that the correct concen­tration of the water treatment product is
maintained in accordance with the manu­facturers’ instructions.

If the boiler is installed in an existing system
any unsuitable additives MUST be removed
by thorough cleansing.
BS 7593:1992 details the steps necessary
to clean domestic central heating system.
Also check pipework and renew any corrod­ed pipework or fittings. Valve glands must
be repacked or replaced wherever neces­sary and any defective controls exchanged.

least 1/2" in BSP nominal size and be in

accordance with BS 2879.

4.8.9

Installation to an existing central heating
system

The combination boiler is designed to oper-

ate on a sealed system only. Therefore if
the existing system is of the open water
type it will have to be modified to comply

with BS 5376 Part 2.

Before, installing a new combination boiler to
an existing system, flush out the old system
with a recommended descaling agent.

16