Ravenheat HE Primary AAA Instructions For Use Installation And Servicing

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HE Primary AAA

05

06

Instructions for Use

Installation and Servicing

To be left with the user

HIGH EFFINCENCY

CONDENSING

PRIMARY BOILER

HE Primary AAA

Natural Gas (G20) I

G.C. No. 47-581-

LPG (G30-G31) I
G.C. No. 47-581-

05

3+

06

2H

- II

- 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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CONDENSING SYSTEM INNOV ATION

CENTRAL HEATING BOILER

This new super high effi cient boiler is designed to meet heating requirements at super high effi ciency,
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 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 efficiency and safety - something which
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 [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

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

- Primary heat exchanger constructed from copper

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

- Aesthetically pleasing panels and controls

- On/Off ball valve for shutting off gas

- Programmable 7 day module with digital display (optional)

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 SUBSTANCES HARMFUL TO 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

GENERAL LAYOUT

10
11

1
2

3
4
5
6
7
8
9

INTRODUCTION
DESIGN PRINCIPLES AND
OPERATING SEQUENCE
TECNICAL DATA
GENERAL REQUIREMENTS
INSTALLATION
COMMISSIONING
SERVICING INSTRUCTIONS
FAUL FINDING
ELECTRICAL SYSTEM DIAGRAM
EXPLODED PARTS DIAGRAM
LIST OF SPARE PARTS

6
6

8-9

6
15
26
30
37
38
42
43

Fig.1

KEY

1 - Heat exchanger
3 - Burner
4 - Sensing electrode
6 - Condensing heat exchanger
9 - Ignition electrode
11- Modulating Gas Valve

15 - Heat control thermostat
18 - Frame
22 - C.H. sensor
26 -Heating control
28 - Air Pressure switch
35 - Condensing trap

4

36 - Fan

38 - Overheat cut off thermostat
45 - Combustion chamber
50 - Flue gas exhaust hood

106 - Flue restriction ring

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OPERATING SCHEME

KEY

1 - Heat exchanger
3 - Burner
4 - Sensing electrode
5 - Flue restriction rin
6 - Condensing heat exchanger

8 - Condensing trap

9 - Ignition electrode
18 - Overheat cut-off thermostat
22- C.H. sensor
26 - Modulating Gas Valve

Fig.2

28 - Air Pressure switch
36 - Fan
38 - Sealed chamber

5

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SECTION 1 INTRODUCTION

2.3.2 Air is drawn by the fan for combustion

1.1 The CSI Primary is a gas fi red room sealed

fan assisted condensing heating boiler suit­able for fully pumped open vented or sealed
system central heating and domestic hot
water systems.

1.2 The provision of stored domestic hot
water is possible by the addition of
an indirect cylinder with ‘Y’ or ‘S’ plan
controls The data badge is placed on the
front panel.

1.2.1 Fig 1 illustrates the general layout of

components.

Fig.2 illustrates the operating principals
described in section 2.

SECTION 2 DESCRIPTION OF CONTROL SYSTEM

AND SEQUENCE OF OPERA TION

2.1 If the main neon is on with a demand for

heat to the system (radiators etc ) the fan
operates via the pressure switch and sends a
signal back to the ignition board that the fan
is running at maximum speed.

2.2 The spark ignition system is powered which
in turn commences the spark ignitor to
operate and light the burner. At this point
the ignition board opens the gas valve to light
the burner.

2.2.1 When the electrode/sensor senses the sig nal
of the burner the spark ignition stops.

2.2.2 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.

2.2.3 When the boiler thermostat is satisfi ed the
boiler will go to rest mode, the burner is shut
down and the pressure switch will return
back to its rest mode.

2.2.4 As the heating sensor reaches temperature
the gas burner power modulates down,
the fan speed. When starting, the fan will
always start at maximum speed.

2.2.5 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.

2.3 GENERAL FUNCTION

2.3.1 The gas valve boiler output settings may

be adjusted to requirements other than
factory settings

2.3.3 he fan also forces exhaust gas through the fl ue
to the outside, this creates a lesser pressure
in the sealed combustion cham ber, thus
sucking in combustion air through the inlet duct

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

2.3.5 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
contin ues to operate until it is stopped by the
timer or one of the thermostats

2.3.6 When the room thermostats and/or timer intervene
the burner shuts down The fan stops and the pump
off via the pump overrun.

2.3.7 The condensate t rap is fi tted with a block age safety
sensor This prevents the boiler operating should there
be a blockage in the condensate discharge trap.

2.3.8 An overheat cut off thermostat set slightly higher
than the heat thermostat acts to turn off the burner to
resetable “lockout” (Fig 50) .

SECTION 4 GENERAL REQUIREMENTS

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 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.

authority, the building regulations and the Building

standards (Scotland) and any rele vant requirements
of the local authority .

4.1 GENERAL INFORMA TION

Both the user and the manufacturer rely
heavily on the installer, whose job it is to in stall the
combination boiler and connect it to a correctly
designed heating system Ac quaint yourself
with the British Standards concerning installation
requirements If you need advice on any points
your Ravenheat Technical Services Offi ce would be
pleased to help It is recommended that tools suitable

6

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OVERALL DIMENSION

PRESSURE DROP ACROSS APPLIANCE

Fig.3

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 Regulations1989

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

IMPORT ANT 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 appli ance unless covered by these
Installation and Service Instructions or
as otherwise recommended by Ravenheat
in writing If in doubt please enquire

Fig.5

Any direct connection of a control device not

approved by Ravenheat could invalidate the
certifi cation and the normal appliance war-
ranty It could also infringe the Gas Safety
regulations and the above regulations

for brass fi ttings are used, and have a capa-
bility to accomodate hexagon sizes up to 50
mm.

CODES OF PRACTICE/Ref Documents
Detailed recommendations are contained in th e

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

BS 5546 Installation of gas hot
water supplies domestic
purposes (2nd Family Gases)

BS 5440 1 Flues (for gas appliances
of rated input not exceeding
60 kW)

NOTE The Ravenheat HE Primary boiler
has been tested and examined by BG,and
is certifi ed to comply with PrEN 483
Manufacturers 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 Primary Boiler

must be as follows The position of installa­tion should be within the building, unless
otherwise protected by suitable enclosure
Adequate space for installation, servicing
and air circulation around boiler must
be allowed for.

The Ravenheat HE Primary must be fi tted

on a fl at and vertical wall capable of ade-
quately 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 CLEARANCES AROUND THE
APPLIANCE

4.3.1 The following minimum free spaces, re-

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

7

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SECTION 3 TECHNICAL DATA

HE PRIMARY AAA

TABLE 1

NATURAL GAS (G 20) І2H - П2H3+

NOMINAL HEAT INPUT NET QMS 22.6 kW
MINIMUM HEAT INPUT NET 11.6 kW

NOMINAL HEAT OUTPUT 22.3 kW
MINIMUN HEAT OUTPUT CONDENSING 23.9 kW
NOMINAL HEAT OUTPUT 11.4 kW
MINIMUM HEAT OUTPUT CONDENSING 12.3 kW

GAS RATE Max 2.3 m

3

/h

AFTER 10 MINUTES min 1.2 m3/h
INLET PRESSURE 20 mbar
BURNER PRESSURE max 10.5 mbar

min 2.0 mbar

BURNER INJECTORS Nr. 13 x 1.25

ELECTRICAL SUPPLY 230V ~ 50 Hz
POWER CONSUMPTION 60 W
EXTERNAL FUSE RATING 3 A
INTERNAL FUSE 2 A

DRY WEIGHT 35 kg
WATER CONTENT C H 0.5 litre

GAS SUPPLY CONNECTION C H 15 mm
FLOW CONNECTION C H 22 mm
RETURN CONNECTION C H 22 mm
CONDENSATION DRAIN 3/4” (21.5 mm) push fi t over fl ow

SEALED WATER SYSTEM C.H.
MAX PRESSURE PMS 2.5 bar
MINIMUM WORKING PRESSURE 0.5 bar

CENTRAL HEATING OPERATING TEMPERATURE MAX - 85 °C min - Off
FLUE OUTLET NOM. DIAMETER 60/100 mm specially supplied with boilers
DESTINATION : AT, DK, Fl, SE CATEGORY I
DESTINATION: GB, IE, CH, ES, IT, PT CATEGORY II2H3+
FLUE TYPE: C12 - C32 - C52 NOX 4

8

2H

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HE PRIMARY AAA

TABLE 1/A

LPG (G 30 - G 31) І3p - П2H3+

NOMINAL HEAT INPUT NET QMS 22.6 kW
MINIMUM HEAT INPUT NET 11.6 kW

NOMINAL HEAT OUTPUT 22.3 kW
MINIMUN HEAT OUTPUT CONDENSING 23.9 kW
NOMINAL HEAT OUTPUT 11.4 kW
MINIMUM HEAT OUTPUT CONDENSING 12.3 kW

GAS RATE Max G31 0.9 m

3

/h G30 0.7 m3/h

AFTER 10 MINUTES min 0.4 m3/h 0.3 m3/h
INLET PRESSURE G31 37 mbar G 30 28-30 mbar
BURNER PRESSURE Max G 31 35. 4 mbar G 30 27. 3 mbar

min 7. 3 mbar 7. 0 mbar
BURNER INJECTORS Nr. 13 x 0.75

ELECTRICAL SUPPLY 230V ~ 50 Hz
POWER CONSUMPTION 60 W
EXTERNAL FUSE RATING 3 A
INTERNAL FUSE 2 A

DRY WEIGHT 35 kg
WATER CONTENT C H 0.5 litre

GAS SUPPLY CONNECTION C H 15 mm
FLOW CONNECTION C H 22 mm
RETURN CONNECTION C H 22 mm
CONDENSATION DRAIN 3/4” (21.5 mm) push fi t over fl ow

SEALED WATER SYSTEM C. H.
MAX PRESSURE PMS 2. 5 bar
MINIMUM WORKING PRESSURE 0. 5 bar

CENTRAL HEATING OPERATING TEMPERATURE MAX - 85 °C min - Off
FLUE OUTLET NOM. DIAMETER 60/100 mm specially supplied with boilers
DESTINATION : BE, FR CATEGORY I
DESTINATION : GB, IE, CH, ES, IT, PT CATEGORY II2H3+
FLUE TYPE : C12 - C32 - C52 NOX 4

3p

9

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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 cupboard

4.4 IMPORTANT NOTICE

4.4.1 If the boiler is to be fi tted 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 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
the Building Regulations applicable in
Scotland, with respect to the installation
of the combina tion boiler in a room or
internal space con taining 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 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 boiler have been examined by BG
Technol ogy Notifi ed Body, and is certifi ed
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
Electra Magnetic Com patibility 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 ade quate to deal with
the rate of gas supply required for all
appliances it serves Instal lation pipes
should be fi tted 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.

of-

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

4.6 FLUE SYSTEM

4.4.1 The terminal should be located where dis-

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 fi g 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 fl ue terminal The effect of such
steaming must be con sidered.

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 fl ue 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 fi tted 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
fl ue must be installed in accordance with the
recommendations of BS 5440.Part 1.

IMPORTANT NOTES

For greater fl ue lengths see twin fl ue
Instructions.
Flue must be positioned in a place not likely
to cause a nuisance.

IMPORT ANT: 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 termi nal

allows the free passage of air across it at all
times.

Minimum acceptable spacing from the ter-

minal to obstructions and ventilation open ing
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.

10

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NOTE The fl ue must be terminated in a place not
likely to cause a nuisance

4.6.2 A concentric vertical fl ue kit is available, for
fl ueing applications up to a maximun height
of 40 metres.
For further details see vertical fl ue installation
instructions.

4.7 AIR SUPPLY

4.7.1 The following notes are intended for general

guidance.
The room sealed fan fl ued boiler does not re
quire a permanent air vent for combustion air
supply.
Where installed in a cupboard or compartment
ventilation is not required.

CONDENSATE DRAIN

A condensate drain is provided on the boiler
This drain must be connected to a drainage
point All pipework and fi ttings in the condesate
drainage system MUST be made of plastic-no
other materials may be used Discharge of
condensate DD X 189 1990 Y.

The drain outlet on the boiler is standard
3/4” (21 5 mm) push fi t overfl ow pipe.

NOTE:Condensate drain pipework must
never be less than 15 mm.

Important: any external runs must be carried
out in 1 1/4 (32 mm) wastepipe .

A fall of 2 5° (45 mm/m) all runs must have.

4.8 WATER CIRCULATION (central heating)

4.81 Detailed recommendations are given in BS

6798:1897/ 5449 : 1990 (for smallbore
and microbore central heating systems).
The following notes are given for general
guidance.

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

4.8.2 Pipework

Copper tubing to BS 2871 1.1.1971 is reco­ mended for water pipes Jointing should be
either with capillary soldered or with
compression fi ttings.

Where possible pipes should have a gradient
to ensure air is carried naturally to air release
points and water fl ows 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 fl oors.

Fig.6A

11

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WATER SYSTEM

4.8.2.1 WATER SYSTEM

For an open (vented) system the boiler

must be supplied from an unrestricted
water supply taken from a feed and expan­ sion tank (minimum 22 litre 5 gall)
capacity situated at a maximum
height of 27 5 metre (90ft) above
the boiler The cold feed supply must
be 15 mm minimum size It is impor­ tant that the relative positions of the
pump, cold feed and open vent See Fig
6D

4.8.2.2 CILINDER

The hot water cylinder must be a

double feed (fully indirect) type

4.8.2.3 SEALED W ATER SYSTEMS

The installation should comply with

the appropriate requirements of BS5449
Part 1 and BS6798, see Fig 6E All valves
and fi t tings must be suitable for use on
sealed systems

4.8.2.4 SAFETY V ALVE

The safety valve must be fi tted in a sealed

system The safety valve must conform
to BS6759 Part 1 and be fitted to the
require ments of BS6798

4.8.2.5 EXP ANSION VESSEL

A diaphragm type expansion vessel,

con forming to BS4814 must be connected
at a point close to the inlet side of the
circulating pump, see Fig 6E or as laid
down by the manufacturer

The expansion vessel must suit the volume

of water in the system, s ee BS5449 Part 1
clause 25 for details The charge pressure
must not be less than static head i e
the height of the highest point of the
system ABOVE the expansion vessel

The expansion vessel should have

suffi cient capacity to accept the volume
change when the water is heated from 10
°C to 110 °C Refer to BS5449 Part 1
for specific details See Table 3

4.8.2.6 PRESSURE GAUGE

A pressure gauge with set pointer and cov-

ering at least the range 0 to 4 bar (0 to 60

2

) shall be permanently fi tted to the sys-

lb/in
tem in a position it can be seen when carry­ ing out the fi lling operation

4.8.2.7 SYSTEM DESIGN

Fig 6A illustrates typical heating only lay -

out Figs 6B and 6C illustrate typical layout
with ‘Y’ or ‘S’ plan system

4.8.3 The water through the appliance heat
exchanger circuit must exceed the min 1 84
gals min (503 It/h) when the burner is fi ring
It is important to ensure that this rate is
achieved when sections of the system are
shut off either manually or bu automatic

12

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controls Therefore a by-pass must be fi t-

ted 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 evene cause the safety thermostat to trip

4.8.4. Draining tap
These must be located in accessible posi-

tions 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.

4.8.5 Air release points

These must be fi tted at all high points where

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

4.8.7 Mains water feed: central heating

There must be no direct connection to

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

4.8.8 Permissible methods of fi lling

Cistern method (Fig 8)
The system may be fi lled by one of the fol-

lowing methods Through a cistern used for
no other purpose, via a ballvalve perma­ nently connected directly to a service
pipe and/or cold water distributing pipe .

The sta tic head available from the

cistern should be adequate to provide
the initial system design pressure.
The cold feed pipe from the cistern should
include a non-return valve, and a stop-valve
with an automatic air vent connected be ­tween them, with the stop valve being locat­ ed, between the cistern and the automatic
air vent The stop valve may remain open
during normal operation of the system,
if automatic water make-up is required
Booster pump method (Fig 8).

13

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SIZING OF EXPANSION VESSEL TABLE 3

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

30

05 10 15

05 10 15 20 10 15 20 15 20

EXPANSION VESSEL VOLUME (LITRES)

21
42
63

83
104
125
146
167
187
208
229
250
270
291
31 2
333
354
375
396
41 6

35

70
105
140
175
210
245
280

31 5
350
385
420
455
490
525
560
595
630
665
700

65
129
194
259
324
388
453
51 8
583
647
71 2
777
841
906
97 1

1036
1101
1165
1230
1259

137
275
413
551
689
826

964
1102
1240
1377
151 5
1653
179 1
1928
2066
2204
2392
2479
261 7
2755

27
54

82
109
136
163
191
218
245
272
300
327
357
38 1
409
436
463
490
51 8
545

47

95
142
190
237
285
332
380
427
475

52.2
570
61 7
665
71 2
760
807
855
902

950

103
206
309
412
515
618
721
824

927
1030
11

33
1236
1339
1442
1545
1648
1751
1854
1957
2060

39

78
117
156
195
234
27 3
312
35 1
390
429
468
507
546
585
624
663
702
741
780

83
165
248
331
413
496
579

662

745
827
910
993

1076
1158
1241
1324
1407
1489
1572
1655

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

The system may be fi lled through a self
contained unit comprising of a cistern pres­sure booster pump if required and if neces­sary an automatic pressure reducing valve
or fl ow restrictor The cistern should be sup-
plied through a temporary connection from
a service pipe or cold water distributing
pipe The unit may remain permanently con­nected to the heating system to provide lim­ited automatic water make up
Mains topping up method (Fig 9)

00833

0 1 40 0 259 0 55 1 0 109 0 1 9 0 0 412 0 15 6 0 331

hose from the draw off tap shall be con-

nected to this fi tting)
b) A test clock
c) Double check valve of an accepted
type
d) A non return valve of an accepted
type

We recommend use of a Ravenheat
Filling Loop designed for this

method of fi lling the system A vailable
from your supplier

Here the temporary connection is supplied
from a service pipe, or distributing pipe,
which also supplies other draw-off points at
a lower level
A combined double check valve shall be
installed upstream of the draw-off point,
through a temporary hose connection from
a tap supplied from the mains, where the
mains pressure is excessive a pressure
reducing valve shall be used to make fi lling
easier The following fi ttings shall form a
permanent part of the system and shall be
fi tted in the order stated

a) A stop valve complying with the require

ments of BS 1010 Part 2 (the temporary

PROVISIONS FOR MAKE UP WATER
(Fig 7)
Provision can be made for replacing water
loss from the system either
A) from a manually fi lled made up bottle
with a readily visible water level The bottle
should be mounted at least 150 mm (6 in)
above the highest point of the system and
be connected through a non return valve
to the return side of the heating system
B) Where fi tting a make up vessel would
be diffi cult re pressurisation of the system
can be done See section on FILLING
If the capacity of the central heating system

14

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should exceed 110 litres, an additional
ves sel 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 Specifi cations 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

Before installing a new boiler to an existing
system, fl ush out the old system with a rec-
ommended descaling agent.
It is most important that the correct concen­tration of the water treatment product
is maintained in accordance with the
manu facturers’ 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 corrod ed
pipework or fittings V alve glands must be
repacked or replaced wherever neces­sary and any defective controls exchanged.

WATER TREATMENT

This boiler has a secondary
ALUMINIUM alloy heat exchanger.
Ravenheat recom mended only the
use of FERNOX-COPAL SENTINEL
X100 or SALAMANDER CUR ROSION
GUARD 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]
Salamander (Eng)Ltd
Tel [phone]

4.10 ELECTRICAL SUPPLY

Warning: this appliance must be
earthed

4.10.1 External wiring to the appliance

must be carried out by a competent
person and be in accordance with the
current I.E.E. Regula tions and local
regulations which apply The Ravenheat
boiler is supplied for con nection
to a 230 V ~ 50 Hz single phase
supply The supply must be fused at 3 A.

NOTE The method of connection
to the electricity supply MUST
facilitate complete electrical isolation
of the appliance, by the use of a fused,
double pole isolator, having a contact
separation of at least 3 mm in all poles
The point of connection to the elec tricity
supply must be readily accessible and

adjacent to the appliance except,

where the appliance is installed
in a bathroom, this MUST be sited
outside the bathroom

SECTION 5 INSTALLATION

5.1 WARNING

5.1.1 It is MOST IMPORTANT that this

appliance is installed in a VERTICAL
POSITION, with the fl ue air duct
passing through the wall Make sure

fl ue slopes 2.5° down towards
the boiler that is 45 mm/m fall per
metre of fl ue length.

15

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5.2 DELIVERY

5.2.1 The appliance carton containing (Fig.15)

a) boiler fully assembled
b) installation instructions and
user instructions
c) white paper template
d) terminal cover plate

Polythene bag containing

a) 1-1/2” BSP Union Gas Cock
b) 2-22 mm fl anged copper tails complete

with 3/4” brass nuts and washers
c) 4 coach bolts and wall plugs
screws and dowels.

WARNING

Maximum allowable fl ue length 2.5 m
maximum No 2x1000 mm
Flue duct extension used with standard fl ue

Horizontal HE fl ue kit carton
containing (Optional) (Fig 12)

57- Flue bend assembly
58- Header gasket
59- Rubber seal Ø 60
60- Air intake duct
61- Flue exhaust duct
62- Terminal
65- Pipe centering spring
66- Flue gas sample point
127-Terminal Cover Plate

Fig. 12

OPTIONAL EXTRAS:

STRAIGHT HEADER Box containing (Fig 13) :

57 - Straight header
59 - Rubber seal Ø 60
66 - Flue gas sample point

FLUE EXTENSION Box containing(Fig 14)
1000 mm fl ue extension duct as an extra cost only when
requested for side and vertical fl ue applications

59 - Rubber seal Ø 60
63 - Air intake duct extension
64 - Flue exhaust duct extension
65 - Pipe centering spring

Fig. 13

Fig. 14

16