Ravenheat HE 120N, HE 150N, HE 120T, HE 150T Instructions For Use Installation And Servicingtion And Servicing

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HE 120N(T)

Low Nox

HE 150N(T)

Low Nox

Instructions for Use

Installation and Servicing

To be left with the user

HIGH EFFINCENCY - LOW NOX

COMBINATION BOILER

HE 120N(T)
HE 150N(T)

Natural Gas (G20) I

LPG (G30-G31) I
G.C. No. XX-XXX-XX

CONDENSING

Low Nox
Low Nox

- II

3+

2H

- II

2H3+

2H3+

Technical and illustative data are not binding and can be modifi ed 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
TEL. [phone] - FAX: [phone]

Website : www.ravenheat.co.uk - E-mail : [e-mail]

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HIGH EFFICENCY CONDENSING SYSTEM INNOV ATION AUTOMATIC MODULATING BOILER

FOR CENTRAL HEA TING AND DOMESTIC HOT WATER

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

POSITION

The appliance is extremely versatile as it can be fi tted in almost any room. The appliance is room sealed, there is no contact

between combustion chamber and living accommodation. This guarantees maximum safety and effi ciency. Indeed, our
depression/combustion front cover has been designed to fi t, achieving maximum air tight seal using screw down fasteners at
15 cm. This should not hinder service of the appliance, but does ensure maximum effi ciency and safety - something which we
at Ravenheat take great pride in.

Each boiler has been designed and manufactured in our modern plant to exacting ISO 9001 discipline, all boilers carry full CE

marking of approval. Technical sales and commercial service are available throughout the UK. This product is guaranteed by
Ravenheat Manufacturing, Chartists Way, Morley, LEEDS, LS27 9ET. Telephone No (01 13) 252 7007.

BASIC COMPONENTS - (See fi gure 1)

Guarantee is a full 12 months from date of purchase providing the appliance has been fi tted in accordance with these instructions

and relevant codes of practice.

MAJOR COMPONENTS

- Gas valve.

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

- Burner with fl ame stabiliser designed to operate under all thermal conditions.

- Primary heat exchanger constructed from stainless steel.

- Unique patented condensing heat exchanger for high thermal fl ue transfer gases to water.

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

- Highly reliable diverter valve with ethylene propylene diaphragm permitting primary fl ow circulation
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 circuit 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. This achieves simplicity of operation with easy to clean

panels.

NOTE: Due to the high effi ciency of this boiler a plume of water vapour will form at the fl ue

terminal during operation.

COSHH - CONTROL OF SUBST ANCES HARMFUL T O HEALTH

IMPORT ANT

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

TABLE OF CONTENTS

PAGE

1
2
3
4
5
6
7
8

9
10
11
12

GENERAL LAYOUT

INTRODUCTION
DESIGN AND OPERATING SEQUENCE
TECHNICAL DATA
GENERAL REQUIREMENTS
INSTALLATION
COMMISSIONING
SERVICING INSTRUCTIONS
REPLACEMENT OF PARTS
FAULT FINDING
ELECTRICAL SYSTEM DIAGRAM
ALTERNATIVE FLUE SYSTEM
LIST OF SPARE PARTS

Fig. 1

6
6

8
10
15
25
27
29
38
40
41
44

KEY

1 - Condensing trap
2 - DC Fan Supply
3 - Ignition Module
4 - Fan
5 - Ignition electrode

6 - Sight glass
7 - Main heat exchanger
8 - Sample point
9 - Circulation pump
10 - Auto air vent valve
11 - Gas Valve

12 - Overheat cut off thermostat
13 - Retaining clips
14 - Expansion vessel
15 -

Sensing electrode

16 - Pressure test point
17 - Gas inlet
18 - C.H. outlet
19 - D.H.W. sensor
20 - Condensate drain
21 - D.H.W. outlet
22 - D.H.W. Heat exchanger
23 - D.H.W. inlet

4

24 - Drain point
25 - C.H. Return

26 - Safety relief system

27 - Three way valve
28 - C.H. sensor
29 - Burner assembly
30 - Water pressure sensor
31 - D.H.W. Switch
32 - Insulation
33 - Rear insulation
34 - Diverter valve Motor

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OPERATING SCHEME

Fig. 2

KEY

1 - Heat exchanger
2 - Heat exchanger for D.H.W.
3 - Burner
4 - Sensing electrode
8 - Condensing trap
9 - Ignition electrode

12 - Gas valve

15 - Sample point
17 - Water pressure switch
18 - Overheat cut-off thermostat
20 - Gas service cock

21 - Compression ball valves

23 - Safety relief system

24 - Diverter valve

26 - Auto air vent valve
28 - Pressure switch
29 - Circulating pump
30 - Water pressure gauge
36 - Fan
37 - Expansion tank
38 - Diverter valve Motor

5

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SECTION 1 INTRODUCTION

1.1 The Ravenheat boiler is for the production

of central and domestic hot water combined
in one unit.

It is fi tted with an automatic domestic hot

water priority valve.
A Summer/winter switch is fi tted to
the left hand side of the control panel.
With the Summer only switch position being

for domestic hot water.
The summer/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

the lower part of the left hand side panel.

1.2 Fig.1 Illustrates the general layout of
components.
Fig.2 Illustrates the operating princi­ ples described in section 2.

SECTION 2

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 .
As the heating sensor reaches temperature

the fan speed modulates down.
When starting, the fan will always start at the

set-point speed.

2.2.8 On the control panel are mounted two

potentiometers (thermostats) these control

the temperature. One is for domestic hot

water and the other for heating.

2.2.9 The boiler is fi tted with an anti-cycling device

on the control board. This delays the boiler

from re-fi ring over a 10 minute.
If the heating temperature goes 20°C below
the set point, the burner restarts immediately .
The domestic hot water will always take

priority and is unaffected by the
anti-cycling device.

GENERAL FUNCTION

2.1 DESCRIPTION OF CONTROL SYSTEM
AND SEQUENCE OF OPERA TION

2.2 Domestic hot water mode

When the appliance is in rest mode with

the mains neon and switch on.
Switch the summer/winter switch to
Summer position, with the heating circuit

charged with water (above 1 bar). If the

domestic hot water tap is turned on,

the boiler will function in the following

sequence:

2.2.1 The pump starts.
The fan starts and sends a signal back to the

ignition board that the fan is running .

2.2.2 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.

2.2.3 When the electrode sensor senses the signal

of the burner, the spark igniter stops.

2.2.4 From the fan speed setting the boiler

increases to the maximum permissible speed

over a period of 5 seconds and will remain at

its maximum required power until its maximum

regulated temperature.

2.3 Central Heating Mode

2.3.1 A potentiometer installed on the panel

instruments permits regulation of the boiler
to partial heating requirements, between
maximum and minimum settings.

2.3.2 Air is drawn by the fan for combustion.

2.3.3 The fan also forces exhaust gas through the fl ue

to the outside, this creates a lesser pressure in
the sealed combustion chamber, thus sucking
in combustion air, through the inlet duct.

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

2.3.5 Interior space temperature is set by the room
thermostat to be installed in the heating
system. The boiler already carries connection
terminals for this thermostat, as well as for a
timeclock.

The burner continues to operate until it is

stopped by the timer or one of the thermostats

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

2.3.7 When the room thermostats intervene the
burner shuts down. The fan stops and the
pump after 3 minutes turns off.

2.2.5 When the domestic hot water tap is closed the
diverter valve goes back into rest mode, the
burner is shut down along with the fan which is
also switched off.

2.2.6 Central heating mode

2.2.7 If the switch is positioned on winter

with a demand for heat to supply radiators,

2.3.8 In summer position an anti-block of the pump

6

is included. Every day the pump is powered for
a period of 2 minutes.
The boiler also incorporates an anti-block
system which powers the pump every 24
hours, allowing it operate for 2 minutes if the
boiler has not been in use. This operation may
in some cases be heard for a short period
when the pump has been activated.

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2.4 Domestic hot water mode

2.4.1 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 fl uids move in a counter
direction fl ow to each other.

2.4.2 Switch 1a Fig.50 in the winter position.

When a hot water tap is turned on a

diaphragm diverter valve excludes the central
heating circuit, the boiler automatically
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.

2.4.4 When D.H.W. is no longer called for the boiler
automatically returns to the central heating
mode.

2.4.5 Switch 1a in the Fig.50 in summer position
The boiler functions like an automatic gas
hot water heater When D.H.W. is no longer
required the burner and fan immediately turn
off.

This also takes place when switch 1a is on
Winter if there is no demand for

heat to the central heating system or until
the room thermostat/time clock demands for
central heating circuit.

2.5 SAFETY DEVICE

In both central heating and domestic hot

water mode safe operating is ensured by a

control board shuts off the main burner if the

fan stops or the fl ue or combustion air intake
duct is obstructed

2.4.3 When domestic hot water is being drawn the
burner and pump perform as they do during
central heating except that the burner is
commanded by the D.H.W. thermostat.

OVERALL DIMENSION

Fig.3

2.5.1 An overheat cut off thermostat acts to
turn of the burner to resetable “lockout”
(Fig. 50) .

2.5.2 A safety valve is fi tted on the central heating

circuit set at 3 bar.

2.5.3 A low water pressure switch set at 0.4 bar is
fi tted on heating circuit.

AVAILABLE PUMP HEAD

Fig.4

PRESSURE DROP ACROSS APPLIANCE

Fig.5

7

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SECTION 3 TECHNICAL DATA

HE 120N (T) Low Nox

TABLE 1

NATURAL GAS (G 20) І2H - П2H3+

NOMINAL HEAT INPUT NET QMS 26.0 kW
MINIMUM HEAT INPUT NET 5.78 kW

NOMINAL HEAT OUTPUT 25.7 kW
NOMINAL HEAT OUTPUT CONDENSING 28.8 kW
MINIMUM HEAT OUTPUT 5.72 kW
MINIMUM HEAT OUTPUT CONDENSING 6.41 kW

3

GAS RATE max 2.7 m
AFTER 10 MINUTES min 0.6 m3/h

INLET PRESSURE 20 mbar
FAN SPEED C.H. Max 175 Hz Combustion % CO2 : G20 - 9.0 (+ 0.2 / - 0.5)

min 47 Hz with the Case OFF
BURNER INJECTORS Nr. 1 x 5.6

ELECTRICAL SUPPLY 230 V ~ 50 HZ
POWER CONSUMPTION 160 W
EXTERNAL FUSE RATING 3A
INTERNAL FUSE F1 - 3.15 A / F2 - 315 mA (20 mm to BS 4265)

/h

DRY WEIGHT 40 kg
WATER CONTENT C.H. 2.0 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
CONDENSATION DRAIN 3/4” (21.5 mm) push fi t over fl ow
MAX COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL 110 LITRE
SEALED WATER SYSTEM C.H.
MAX PRESSURE PHS 2.5 bar
MINIMUM WORKING PRESSURE 0.5 bar
7 LITRES EXPANSION VESSEL PRE-CHARGE-PRESSURE 0.5 bar
CENTRAL HEATING OPERATING TEMPERATURE MAX 85°C min 40°C
DESIGN FLOW RATE 1383 I/h 20 °C RISE
MINIMUM FLOW RATE C.H. 503 I/min
D.H.W. FLOW RATE 30 °C rise 15.4 l/min
D.H.W. FLOW RATE 35 °C rise 13.2 l/min
D.H.W. FLOW RATE 40 °C rise 11.5 l/min 10°C inlet temperature

D.H.W. TEMPERATURE Max 60 °C min 40 °C
FAN SPEED D.H.W. Max 205 Hz min 47 Hz

Qmw Input Net Max 32.5 kW min 5.78 kW
D.H.W. PRESSURE PMW Max 10 bar (147 p.s.i.)
D.H.W. PRESSURE PMW min 0.8 bar (118 p.s.i.) To obtain heat input 1.2 bar
D.H.W. MINIMUM FLOW RATE 3 I/min
FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers (If required)
DESTINATION: AT, DK, Fl, SE CATEGORY I

2H

DESTINATION: GB, IE, CH, ES, IT, PT CATEGORY II2H3+
FLUE TYPE - C13 - C33 - C53 NOX 5 SEDBUK

A

8

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SECTION 3 TECHNICAL DATA

HE 120N (T) Low Nox

TABLE 1/A

LPG (G 30 - G 31) І3+ - П2H3+

NOMINAL HEAT INPUT NET QMS 26.0 kW
MINIMUM HEAT INPUT NET 5.78 kW

NOMINAL HEAT OUTPUT 25.7 kW
NOMINAL HEAT OUTPUT CONDENSING 28.8 kW
MINIMUM HEAT OUTPUT 5.72 kW
MINIMUM HEAT OUTPUT CONDENSING 6.41 kW

3

GAS RATE max G31 0.9 m
AFTER 10 MINUTES min 0.4 m3/h 0.3 m3/h

INLET PRESSURE G31 37 mbar G30 28-30 mbar
FAN SPEED C.H. Max 160 Hz Combusiton % CO2 : G31 - 10.2 (+ 0.2 / - 0.5)

min 44 Hz with the Case OFF G30 - 11.0 (+ 0.2 / - 0.5)
BURNER INJECTORS Nr. 1 x 5.6

ELECTRICAL SUPPLY 230 V ~ 50 HZ
POWER CONSUMPTION 160 W
EXTERNAL FUSE RATING 3A
INTERNAL FUSE F1 - 3.15 A / F2 - 315 mA (20 mm to BS 4265)

/h G30 0.7 m3/h

DRY WEIGHT 40 kg
WATER CONTENT C.H. 2.0 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
CONDENSATION DRAIN 3/4” (21.5 mm) push fi t over fl ow
MAX COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL 110 LITRE
SEALED WATER SYSTEM C.H.
MAX PRESSURE PHS 2.5 bar
MINIMUM WORKING PRESSURE 0.5 bar
7 LITRES EXPANSION VESSEL PRE-CHARGE-PRESSURE 0.5 bar
CENTRAL HEATING OPERATING TEMPERATURE MAX 85°C min 40°C
DESIGN FLOW RATE 1383 I/h 20 °C RISE
MINIMUM FLOW RATE C.H. 503 I/min
D.H.W. FLOW RATE 30 °C rise 15.4 l/min
D.H.W. FLOW RATE 35 °C rise 13.2 l/min
D.H.W. FLOW RATE 40 °C rise 11.5 l/min 10°C inlet temperature

D.H.W. TEMPERATURE Max 60 °C min 40 °C
FAN SPEED D.H.W. Max 190 Hz min 44 Hz

Qmw Input Net Max 32.5 kW min 5.78 kW
D.H.W. PRESSURE PMW Max 10 bar (147 p.s.i.)
D.H.W. PRESSURE PMW min 0.8 bar (118 p.s.i.) To obtain heat input 1.2 bar
D.H.W. MINIMUM FLOW RATE 3 I/min
FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers (If required)
DESTINATION: BE, FR CATEGORY I

3+

DESTINATION: GB, IE, CH, ES, IT, PT CATEGORY II2H3+
FLUE TYPE - C13 - C33 - C53 NOX 5 SEDBUK

A

9

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SECTION 3 TECHNICAL DATA

HE 150N(T) Low Nox

TABLE 1

NATURAL GAS (G 20) І2H - П2H3+

NOMINAL HEAT INPUT NET QMS 32.0 kW
MINIMUM HEAT INPUT NET 8.0 kW

NOMINAL HEAT OUTPUT 31.7 kW
NOMINAL HEAT OUTPUT CONDENSING 34.9 kW
MINIMUM HEAT OUTPUT 7.93 kW
MINIMUM HEAT OUTPUT CONDENSING 8.73 kW

3

GAS RATE max 3.4 m
AFTER 10 MINUTES min 0.85 m3/h

INLET PRESSURE 20 mbar
FAN SPEED C.H. Max 180 Hz Combustion % CO2 : G20 - 9.0 (+ 0.2 / - 0.5)

min 53 Hz with the Case OFF
BURNER INJECTORS Nr. 1 x 6

ELECTRICAL SUPPLY 230 V ~ 50 HZ
POWER CONSUMPTION 160 W
EXTERNAL FUSE RATING 3A
INTERNAL FUSE F1 - 3.15 A / F2 - 315 mA (20 mm to BS 4265)

/h

DRY WEIGHT 42 kg
WATER CONTENT C.H. 2.0 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
CONDENSATION DRAIN 3/4” (21.5 mm) push fi t over fl ow
MAX COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL 110 LITRE
SEALED WATER SYSTEM C.H.
MAX PRESSURE PHS 2.5 bar
MINIMUM WORKING PRESSURE 0.5 bar
7 LITRES EXPANSION VESSEL PRE-CHARGE-PRESSURE 0.5 bar
CENTRAL HEATING OPERATING TEMPERATURE MAX 85°C min 40°C
DESIGN FLOW RATE 1811 I/h 20 °C RISE
MINIMUM FLOW RATE C.H. 503 I/min
D.H.W. FLOW RATE 30 °C rise 20.1 l/min
D.H.W. FLOW RATE 35 °C rise 17.3 l/min
D.H.W. FLOW RATE 40 °C rise 15.1 l/min 10°C inlet temperature

D.H.W. TEMPERATURE Max 60 °C min 40 °C
FAN SPEED D.H.W. Max 210 Hz min 53 Hz

Qmw Input Net Max 42.5 kW min 8.0 kW
D.H.W. PRESSURE PMW Max 10 bar (147 p.s.i.)
D.H.W. PRESSURE PMW min 0.8 bar (118 p.s.i.) To obtain heat input 1.2 bar
D.H.W. MINIMUM FLOW RATE 3 I/min
FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers (If required)
DESTINATION: AT, DK, Fl, SE CATEGORY I

2H

DESTINATION: GB, IE, CH, ES, IT, PT CATEGORY II2H3+
FLUE TYPE - C13 - C33 - C53 NOX 5 SEDBUK

A

10

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SECTION 3 TECHNICAL DATA

HE 150N (T) Low Nox

TABLE 1/A

LPG (G 30 - G 31) І3+ - П2H3+

NOMINAL HEAT INPUT NET QMS 32.0 kW
MINIMUM HEAT INPUT NET 8.0 kW

NOMINAL HEAT OUTPUT 31.7 kW
NOMINAL HEAT OUTPUT CONDENSING 34.9 kW
MINIMUM HEAT OUTPUT 7.93 kW
MINIMUM HEAT OUTPUT CONDENSING 9.06 kW

3

GAS RATE max G31 1.3 m
AFTER 10 MINUTES min 0.3 m3/h 0.25 m3/h

INLET PRESSURE 20 mbar
FAN SPEED C.H. Max 155 Hz Combusiton % CO2 : G31 - 10.2 (+ 0.2 / - 0.5)

min 48 Hz with the Case OFF G30 - 11.0 (+ 0.2 / - 0.5)
BURNER INJECTORS Nr. 1 x 6

ELECTRICAL SUPPLY 230 V ~ 50 HZ
POWER CONSUMPTION 160 W
EXTERNAL FUSE RATING 3A
INTERNAL FUSE F1 - 3.15 A / F2 - 315 mA (20 mm to BS 4265)

/h G30 0.99 m3/h

DRY WEIGHT 42 kg
WATER CONTENT C.H. 2.0 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
CONDENSATION DRAIN 3/4” (21.5 mm) push fi t over fl ow
MAX COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL 110 LITRE
SEALED WATER SYSTEM C.H.
MAX PRESSURE PHS 2.5 bar
MINIMUM WORKING PRESSURE 0.5 bar
7 LITRES EXPANSION VESSEL PRE-CHARGE-PRESSURE 0.5 bar
CENTRAL HEATING OPERATING TEMPERATURE MAX 85°C min 40°C
DESIGN FLOW RATE 1811 I/h 20 °C RISE
MINIMUM FLOW RATE C.H. 503 I/min
D.H.W. FLOW RATE 30 °C rise 20.1 l/min
D.H.W. FLOW RATE 35 °C rise 17.3 l/min
D.H.W. FLOW RATE 40 °C rise 15.1 l/min 10°C inlet temperature

D.H.W. TEMPERATURE Max 60 °C min 40 °C
FAN SPEED D.H.W. Max 195 Hz min 48 Hz

Qmw Input Net Max 42.5 kW min 8.0 kW
D.H.W. PRESSURE PMW Max 10 bar (147 p.s.i.)
D.H.W. PRESSURE PMW min 0.8 bar (118 p.s.i.) To obtain heat input 1.2 bar
D.H.W. MINIMUM FLOW RATE 3 I/min
FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers (If required)
DESTINATION: AT, DK, Fl, SE CATEGORY I

2H

DESTINATION: GB, IE, CH, ES, IT, PT CATEGORY II2H3+
FLUE TYPE - C13 - C33 - C53 NOX 5 SEDBUK

A

11

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SECTION 4 GENERAL REQUIREMENTS

4.1 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 installer
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 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 with. Check the boiler
and flue is the correct type for installation.

The installation of the boiler MUST be

in accordance with the latest I.E.E. (BS

7671) Wiring Regulations, local building
regulations, bye-laws of the local water
authority, the building regulations and the
Building Standards (Scotland) and any
relevant requirements of the local authority.

4.1.1 GENERAL INFORMATION

Both the user and the manufacturer rely

heavily on the installer, whose job it is to
install the combination boiler and connect
it to a correctly 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 recommended that tools suitable for
brass fittings are used, and have a capability

to accomodate 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 Low pressure installation pipes.
BS.6798 Installation of gas fired hot water

boilers of rated input not exceeding
60 kW.

BS.5449 Forced circulation hot water systems.

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 recommended by Ravenheat in
writing. If in doubt please enquire.

Any direct connection of a control device

not approved by Ravenheat could invalidate
the certification and the normal appliance
warranty.

It could also infringe the Gas Safety regulations

and the above regulations.

NOTE:
The Ravenheat HE combination boiler has

been tested and examined by BG, and is
certified to comply with PrEN 483 and BS EN

625.

Manufactures instructions must NOT be taken

in any way as overriding statutory obligations.

If in doubt on any point please consult

Ravenheat Manufacturing Ltd.

4.2 LOCATION OF BOILER

4.2.1 Siting of Ravenheat HE Combi Boiler must be

as follows.

The position of installation should be within

the building, unless otherwise protected by a
suitable enclosure.

Adequate space for installation, servicing and

air circulation around boiler must be allowed
for.

The Ravenheat HE 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.

BS.5546 Installation of gas hot water supplies

domestic purposes (2ndFamily

Gases).

BS.5440: 1 Flues (for gas appliances of rated

input not exceeding 60 kW).

BS.5440: 2 Ventilation (for gas appliances of

rated input not exceeding 60 kW).

DD 189: 1990 Discharge of condensate.

Health & Safety Document No.635

The Electricity at Work Regulations, 1989.

4.3 CLEARANCES AROUND THE APPLIANCE

4.3.1 The following minimum free spaces, required

18 inches (450 mm) in front
5 inches (125 mm) above
6 inches (150 mm) below

0.2 inches (5 mm) on each side
1 inch (25 mm) in front when installed in a

12

for installation inspection and servicing, must
be left around the boiler

cupboard.

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

4.4 IMPORTANT NOTICE

4.6 FLUE SYSTEM

4.4.1 For installation into timber framed buildings,

please refer to the Institute of Gas Engineers
Document IGE UP/7 instead of 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
particular 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 Scotland, 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,
utilising 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 combination

boiler MUST be designed and constructed
specifically for this purpose. An existing
cupboard, or compartment, may be used
provided it is modified accordingly Samples
of the CSI combination boiler have been
examined by B.G. Technology Notified Body,
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 Compatibility
Directive 89/336/EEC and are therefore

permitted to carry the CE Mark.
The appliance has been tested and approved

by the WRc as meeting the requirements of

G3 and L of the Building regulations and water

Bylaws Scheme - Approved Products.

4.5 GAS SUPPLY

4.5.1 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

remaining 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 described in the above

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

other appliances ensure an adequate

supply is available both to the boiler and the
other appliances when they are in use at the
same time.

4.6.1 The terminal should be located where
dispersal 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

considered

The terminal must not be closer than 25 mm
(1 in) to any combustible material For protection

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

Pluming will occur at the terminal so, where

possible, terminal positions which could cause
a nuisance should be avoided.

The flue must be installed in accordance with

the recommendations of BS 5440: Part 1.

IMPORTANT NOTES
For greater fl ue lengths see alternative fl ue
instructions. Flue must be positioned in a
place not likely to cause a nuisance from
pluming.

IMPORTANT NOTICE: If the fl ue terminates

less a balcony, above the ground, or above
a fl at roof to which people have access,
then a suitable terminal guard must be
fi tted. 0001PRO06005/0
Fit only recommended FLUE TERMINAL
GUARD by securing concentrically around
terminal with screws.
Available on request from:

RAVENHEAT Manufacturing Ltd
Morley, Leeds, West Yorkshire
ENGLAND LS27 9ET - UK

Tel.[phone]

IMPORTANT: The following notes are intended

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
tirnes.

Minimum acceptable spacing from the terminal to
obstructions and ventnation opening are specifi ed
in Fig. 6.

Note positions: Due to the terminal design,
installation is possible with clearances less than
those specifi ed in BS 5440, Part 1

13

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Fig.6

Terminal position for fan assisted boiler

(minimum distance) mm

A - Directly below an open window or other 300
opening (e.g. air brick)
B - Below gutters, soil pipes or drain pipes 75
C - Below eaves 150
D - Below balconies or car port roof 200
E - From vertical drain pipes and soil pipes 150
F - From internal or external corners 300
G - Above ground or below balcony level 300
H - From a surface facing a terminal 600
I - From a terminal facing a terminal 1200
J - From an opening in the car port
(e.g. door window) into dwelling. 1200
K - Vertically from a terminal on the same wall 1500
L - Horizontally from a terminal on the same wall 300
M - From adjacent wall to flue 300

NOTE: The flue must be terminated in a place not

likely to cause a nuisance.

4.6.2 A concentric vertical flue kit is available for
flueing applications up to a maximum height of
4 metres.

For further details see vertical flue installation

instructions.

4.7 AIR SUPPLY

4.7.1 The following notes are intended for general

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 WATER CIRCULATION (central heating)

4.8.1 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.

4.8.2 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 to 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.

4.8.3 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.

Therefore a by-pass must be fitted to the

system (15 mm min.) (Fig. 6A).

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

Fig.6A

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

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 accordance with BS 2870

1980.

4.8.5 Air release points
These must be fitted at all high points where

air will naturally collect, and must be sited to
facilitate complete filling of the system.

4.8.6 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 Its of expansion water.

If the appliance is connected 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.

4.8.8 Permissible methods of filling

Fig.7

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.

Fig.8

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

15

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SIZING OF ADDITIONAL EXPANSION VESSEL: TABLE 3

Deduct from the value given in the table the 7 litre vessel supplied.

Safety

valve setting (bar)

Vessel charge

pressure (bar)

Initial system

pressure (bar)

T otal water

content of system

Litres

25

50

75
100
125
150
175
200
225
250
275
300
325
350
375
400
425
450
475
500

3.0

0.5 1.0 1.5

0.5 1.0 1.5 2.0 1.0 1.5 2.0 1.5 2.0

EXPANSION VESSEL VOLUME (LITRES)

2.1

4.2

6.3

8.3

10.4

12.5

14.6

16.7

18.7

20.8

22.9

25.0

27.0

29.1
31 .2

33.3

35.4

37.5

39.6

41.6

3.5

7.0

10.5

14.0

17.5

21.0

24.5

28.0
31 .5

35.0

38.5

42.0

45.5

49.0

52.5

56.0

59.5

63.0

66.5

70.0

6.5

12.9

19.4

25.9

32.4

38.8

45.3
51 .8

58.3

64.7
71 .2

77.7

84.1

90.6

97 .1

103.6

110.1

116.5

123.0

125.9

13.7

27.5

41.3

55.1

68.9

82.6

96.4

110.2

124.0

137.7
151 .5

165.3

179 .1

192.8

206.6

220.4

239.2

247.9
261 .7

275.5

2.7

5.4

8.2

10.9

13.6

16.3

19.1

21.8

24.5

27.2

30.0

32.7

35.7
38 .1

40.9

43.6

46.3

49.0
51 .8

54.5

4.7

9.5

14.2

19.0

23.7

28.5

33.2

38.0

42.7

47.5

52..2

57.0
61 .7

66.5
71 .2

76.0

80.7

85.5

90.2

95.0

10.3

20.6

30.9

41.2

51.5

61.8

72.1

82.4

92.7

103.0
1

13.3

123.6

133.9

144.2

154.5

164.8

175.1

185.4

195.7

206.0

3.9

7.8

11.7

15.6

19.5

23.4
27 .3

31.2
35 .1

39.0

42.9

46.8

50.7

54.6

58.5

62.4

66.3

70.2

74.1

78.0

107.6

115.8

124.1

132.4

140.7

148.9

157.2

165.5

8.3

16.5

24.8

33.1

41.3

49.6

57.9

66.2

74.5

82.7

91.0

99.3

For system volumes
other than those given
above, multiply the
system volume by
the factor across

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

SERVICING INSTRUCTIONS.

B) Where fitting of 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
110 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 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 operate

on a sealed system only. Therefore if the
existing system is of the open water type it will

0.0833 0.140

0.259 0.551 0 .109 0.190 0.412 0.156 0.331

If the boiler is installed in an existing system

any unsuitable additives MUST be removed
by thorough cleaning.

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.

WATER TREATMENT
This boiler has a stainless steel heat

exchanger Ravenheat recommended only the
use of FERNOX- COPAL or SENTINEL X100
water treatment products, which must be
used in accordance with the manufacturers

instructions. For further information contact:
Fernox Manufacturing Co. Ltd.
Tel [phone]
Sentinel Division Betz Dearborn Ltd.
Tel. [phone]

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