ELECTRONIC IGNITION - AUTOMATIC MODULATING BOILER
FANNED COMBI
RSF 82E - RSF 82ET
WITHOUT TIMER
RSF 82E G.C. N
NATURAL GAS (G 20)
Tested, certified and
service listed
Listed by The United Kingdom Water
Fitting Byelaws Scheme
0
47 581 18
WITH TIMER
RSF 82ET G.C. N0 47 581 04
NATURAL GAS (G 20)
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 (0113) 252 7007
ELECTRONIC IGNITION - AUTOMATIC MODULATING BOILER.
FOR CENTRAL HEATING AND DOMESTIC HOT WATER
This new high efficient turbo-modulating boiler is designed to meet domestic hot water and central heat-
ing 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 accomodation. This guarantees maximum safety
and efficiency. Indeed, our depression/combustion front cover has been designed to fit 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 IS0 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, Chartist Way, Morley,
LEEDS, LS27 9ET. Telephone No 0113 2527007.
.
BASIC COMPONENTS - (See figure 1)
Guarantee is a full 12 months from date of purchase providing the appliance has been fitted in accor-
dance 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.
Double parallel heat exchanger which, for domestic hot water uses, the “countercurrent”
system, offering high thermal exchange and durability.
High reliability diverter valve with ethylene propylene diaphragm permitting primary fluid circulation in the boiler during D.H.W. supply. This gives maximum heat exchange, improved efficiency and exceptionally silent operation.
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. This achieves simplicity of operation with easy
to clean panels.
COSHH - CONTROL OF SUBSTANCES HARMFULTO 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 envi-
ronment components should be re-cycled.
3
SECTIONS:
1
2
3
4
5.
6
7
8
9
10
11’
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
GENERAL
LAYOUT
KEY
1 - Heat exchanger
3 - Burner
4 - Pilot burner
7 - Ignition board
9 - Ignition electrode
11 - Frame
12 - Modulating gas valve
15 - Heating control
16 - Hot water control
4
17 - DHW sensor 33 - Main switch
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
34 - C.H. Sensor
36 - Fan
37 - Expansion tank
38 - Sealed chamber
45 - Combustion chamber
50 - Flue gas exhaust hood
105 - Timer
30 -Water pressure gauge 106 -Air restriction ring
OPERATING SCHEME
Fig
.2
KEY
1 - Heat exchanger
2 - Heat exchanger for D.H.W. water
3 - Burner
4-
Pilot burner
5 - Air restriction ring
Electronic ignition
79-
Ignition electrode
12- Modulating gas valve
Heating control
15-
16 - Hot water control
18 - Overheat cut-off thermostat
20 - Gas service cock
21 - Compression ball valves
23 Safety relief system
24 -Three way valve
25 - Flow regulator
26 - Auto air vent valve
27 - D.H.W. Pressure switch giving priority 62 -Terminal
28 - Air pressure switch
29 - Circulating pump
30 -Water pressure gauge
36-Fan
37 - Expansion tank
38 - Sealed chamber
60 -Air intake duct
61 - Flue duct
5
SECTION 1
1.1
INTRODUCTION
The Ravenheat boiler is for the use of
central 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.
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 left
hand side of the frame.
2.2.6
2.2.7
switched off, the pressure switch returning
to its rest mode.
Central heating mode
If the switch is positioned on
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.
1.2
SECTlON 2
2.1
2.2
2.2.1
2.2.2
2.2.3
2.2.4
Fig. 1 Illustrates the general layout of
components.
Fig. 2 Illustrates the operating principles
described in section 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 summer/winter switch in the 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:
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 first
step of the gas valve to light the pilot/burner.
When the electrode/sensor senses the
signal from the pilot/burner, it opens the
second stage of the gas valve via the ignition
board on minimum power. Upon the second
valve opening 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.
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
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 this permits regulation of the
boiler to partial heating requirements,
between the factory setting.
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 chamber,
thus sucking in combustion air, through the
inlet duct.
The boiler water temperature is automatical-
ly controlled by a built in thermostat. .
Interior space temperature is set by the
room thermostat to be installed in the heating system. The boiler already carries con-
nection terminals for this thermostat, as well
as for a timeclock. The burner will continue
to operate until it is stopped by the timer or
one of the thermostats.
When the internal C.H. temperature sensor
intervene the main burner shuts down. The
fan stops but the pump continues to operate.
2.2.5
6
When the domestic hot water tap is closed
the diverter valve goes back into rest mode,
the main burner is shut down along with the
pilot/burner. The pump and fan are also
2.3.7
When the room thermostats intervene the
main burner shuts down. The fan stops and
the pump turns off.
2.4
2.4.1
2.4.2
2.4.3
Domestic hot water mode 2.4.4
The heat exchanger in the D.H.W. circuit is
built into the main heat exchanger, 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 33 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.
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. thermostat.
2.4.5
3.1
When D.H.W. is no longer called for the boiler automatically returns to the central heating mode.
Switch 33 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 33 is on
(winter) if there is no demand for
heat to the central heating system or until
the room thermostat/time clock 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.
OVERALL DIMENSION
Fig. 3
3.1.2
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
3.2.1
A safety valve fitted on the
central heating circuit set at
43 psi (3 bar).
A heating circuit (low water)
pressure switch is set at 0.4
bar.
SECTION
3 TECHNICAL DATA
TABLE 1
HEAT INPUT NET
NOMINAL
HEAT OUTPUT
NOMINAL
GAS RATE max
AFTER 10 minutes
INLET PRESSURE
BURNER PRESSURE
GAS CONTROL VALVE
MAIN BURNER
MAIN BURNER INJECTORS
PILOT BURNER
NATURAL GAS (G 20) I 2H
max
mid
min
max
mid
min
mid
min
20 mbar
ma*
mid
min
SIT
POLIDORO MOD/NP
N. 13X1.35
POLIDORO PA525F
26.1 kW
18.9 kW
13.0 kW
23.6 kW
16.6 kW
10.3 kW
3
/h
2.6 m
3
/h
2.1 m
1.3 m3/h
(8.0 in wg.)
8.1 mbar
4.1 mbar
1.5 mbar
837 TANDEM
.
(89,100 Btu/h)
(64,500 Btu/h)
(44,400 Btu/h)
(80,500 Btu/h)
(56,700 Btu/h)
(35,200 Btu/h)
(91.8 ft
(74.1 ft
(45.9 ft3/h )
(3.2 in wg.)
(1.6 in wg.)
(0.6 in wg.)
PILOT INJECTOR 0.27x2 HOLES
ELECTRICAL SUPPLY
230V-50HZ
POWER CONSUMPTION 160W
EXTERNAL FUSE RATING 3A
INTERNAL FUSE RATING
DRY WEIGHT
WATER CONTENT D.H.W.
WAT
ER CONTENT C.H.
315 mA - 2A - 4A (20mm to BS4265)
48 kg (106 Lbs\
0.5 Lts. (0.9 pints)
3.0 Lts. (5.3 pints)
NECTION RC 112"GAS SUPPLY CON
FLOW CONNECTION C.H.
RETURN CONNECTION C.H.
INLET CONNECTION D.H.W.
OUTLET CONNECTION D.H.W.
22 mm
22 mm
15mm
15mm
compression isolating valve
compression isolating valve
compression isolating valve
copper pipe
MAXIMUM PERMISSIBLE COLD WATER CAPACITY WITHOUT ADDITIONAL EXPANSION VESSEL
110 LITRES
SAFETY DISCHARGE PIPE 15mm
copper pipe
SEALED WATER SYSTEM C.H. SYSTEM
MAX PRESSURE 2.5 bar (35.6 p.s.i.)
MINIMUM WORKING PRESSURE 0.5 bar, (7.35 p.s.i.)
8 LITRES EXPANSION VESSEL PRE-CHARGE-PRESSURE 0.5 bar (7.35 p.s.i.)
CENTRAL HEATING OPERATING TEMPERATURE MAX 85
MIN 45
DESIGN FLOW RATE 1013 I/h (223 gals) 20
o
C
o
C RISE
o
C
MINIMUM FLOW RATE C.H./503 Lts/h (111 gals/h)
D.H.W. FLOW RATE 30oC rise 11.3 l/min (2.5 gals/min)
D.H.W. FLOW RATE 35
D.H.W. FLOW RATE 40oC rise
D.H.W.TEMPERATURE
o
C rise
9.7 l/min (2.1 gals/min)
8.5 I/min (1.9 gals/min) 10 oC inlet temperature
max 65 oC
min 35°C
D.H.W. PRESSURE
max 10 bar (147 p.s.i.)
min 0.8 bar (11.8 p.s.i.)
To obtain 95% heat input 1.0 bar (14.5 psi.)
D.H.W. MINIMUM FLOW RATE 3 I/m (0.66 gals/min)
3
/h)
3
/h)
FLUE OUTLET NOM. DIA. 100 m/m specially supplied with boilers
DESTINATION: GB
FLUE TYPE - C 12- C
32
CATEGORY I 2H
NOX 2
SECTION 4 GENERAL REQUIREMENTS
4.0
4.1
SAFETY
Gas Safely (Installation and USE) Regulations,
1994, and amendments 1996.
It is law that all gas appliances are installed and serviced by a Corgi registered installer (identified by
in accordance with the above regulations. Failure to
install appliances correctly could lead to
tion. It is in your own interest, and that of safety,
ensure the law is complied with. Check the boiler
and flue is the correct type for installation.
The installation of the boiler MUST also 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.
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 requirement. If you need
advice on any points your Ravenheat Technical
Services Office would be pleased to help. It is rec-
ommended that tools suitable for brass fittings are
used, and have a capability to accommodate hexa-
gon sizes up to 50 mms.
CODES OF PRACTICE/Fief: Documents
Detailed recommendations are contained in the following British Standard Codes of Practice:
prosecu-
to
4.2
4.2.1
NOTE: The Ravenheat boiler has been tested and
examined by BG Technology Certification Services
and is certified to comply with the relevant requirements of ES 5258 Part 1 1986 BS 6332 Part 1 1983
and the relevant BGK3.G. 1 agreements, also tests
based on BS 5286 Part 1,
If in doubt on any point please consult Ravenheat
Manufacturing Ltd.
LOCATION OF BOILER
Siting of Ravenheat RSF 82E Combi 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 aircirculation around boiler must be allowed for.
The Ravenheat RSF 82E 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.
CLEARANCES AROUNDTHE APPLIANCE
The following minimum free spaces, required for
installation inspection and servicing, must be left
around the boiler
18 inches (450 mm) in front
5 inches (120 mm) above
6 inches (150 mm) below
3 inches (75 mm) on each side
1 inch (25 mm) in front when installed in a cupboard.
BS. 6891
BS. 6798
BS. 5449
BS. 5546
BS. 544O:1
BS. 5440:2
Health &Safety Document No. 635
The Electricity at Work Regulations, 1989.
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
Servicing 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 certifi-
cation and the normal appliance warranty. It could
also infringe the Gas Safety regulations and the
above regulations.
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).
Ventilation (for gas appliances of
rated input not exceeding 60 kW).
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 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 RSF 82E 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
Approved Products.
regulations and water Bylaws Scheme -
9
4.5
4.5.1
GAS SUPPLY
A gas meter is connected to the service pipe
by the Local Gas Supplier or a 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 con-
nection 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.
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 times.
Minimum acceptable spacing from the terminal to obstructions and ventilation opening are specified in Fig. 6.
Note positions: Due to the terminal design,
installation is possible with clearances less
than those specified in BS 5440, Part 1.
Fig. 6
4.6
4.6.1
FLUE SYSTEM
The terminal should be located where dis-
persal of combustion products is not impeded and with due regard for the damage or
discoloration 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.
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 NOTICE: if a left or right side
flue is required, then a 90 Degree Bend will
be needed. (Not supplied as standard).
Available on order. If the flue terminates less
than 2 M. above a balcony, above the
ground, or above a flat roof to which people
have access, then a suitable terminal guard
must be fitted.
Fit only recommended flue terminal guard
by securing concentrically around terminal
with screws.
Available on request from:
NOTE:
The flue must be terminated in a place not
likely to cause a nuisance.
10
RAVENHEAT Manufacturing Ltd
Chartists Way
Morley, Leeds, West Yorkshire
ENGLAND LS27 9ET - U.K.
Tel. 0113 252 7007
4.6.2
4.7
4.7.1
A concentric vertical flue kit is available, for
flueing applications up to a maximun height
of 4.5 metres.
For further details see vertical flue installation instructions and page 21.
AIR SUPPLY
The following notes are intended for general guidance.
The roomsealed 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
4.8.1
4.8.2
WATER CIRCULATION (central heating)
Detailed recommendations are given in BS
6798 5449.1.1977 (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 gradi-
ent 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.
Fig. 6A
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 fit-
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 even cause the safety thermostat to trip.
11
4.8.4
4.8.5
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.
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.
ed to the heating system to provide limited
automatic water make up.
Mains topping up method (Fig.9).
Here the temporary connection is supplied
from a service pipe, or distributing pipe,
which also supplies other draw-off points at
a lower level.
4.8.6
4.8.7
4.8.8
The appliance has an integral sealed expan-
sion vessel to accomodate the increase of
water volume when the system is heated. It
can accept up to 1.5 gal (7 Its) of expansion
water. lf the appliance is connected to a system with an unusually high water content,
calculate the total expansion and add additional sealed expansion capacity as appro-
priate (Fig. 7).
In general modern systems will present no
problem.
Fig. 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.
Permissible methods of filling
Cistern method (Fig. 8).
The system may be filled by one of the following methods. Through a cistern used for
no other purpose, via a ballvalve permanently connected directly to a service pipe
and/or cold water distributing pipe. The stat-
ic 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 between 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).
The system may be filled through a self contained unit comprising of a cistern pressure
booster pump if required and if necessary
an automatic pressure reducing valve or
flow restrictor. The cistern should be supplied through a temporary connection from a
service pipe or cold water distributing pipe.
The unit may remain permanently connect-
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 filling
easier. The following fittings shall form a permanent part of the system and shall be fitted in the order stated.
a) A stop valve complying with the require-
ments of BS 1010 Part 2 (the temporary
hose from the draw off tap shall be connected to this fitting).
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
filling the system. Available from your
supplier.
PROVISIONS FOR MAKE UP WATER
(Fig. 7)
Provision can be made for replacing water
loss from the system either.
A) from a manually filled 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.
12
SIZING OF ADDITIONAL EXPANSION VESSELS: 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)
Total 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
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.
3.0
0.5
0.5
2.1
4.2
6.3
6.3
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
0.0833
1.0
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
70.1
0.140
1.5
6.5
I2.9
19.4
25.9
32.4
38.8
45.3
51.8 110.2
58.3
64.7
71.2
77.7 165.3
84.1 179.1
90.6
97.1
103.6
110.1
116.5 247.9
123.0
125.9
0.259
2.0
13.7
27.5 5.4
41.3
55.1
68.9
82.6
96.4
124.0
137.7
151.5
192.8
206.6
220.4
239.2
261.7
275.5
0.551
1.0
1.0
EXPANSION VESSEL VOLUME (LITRES)
2.7
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
0.109
1.5
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
0.190
2.0
10.3
20.6
30.9
41.2
51.5
61.8
72.1
82.4
92.7
103.0
113.3
123.6
133.9
144.2
154.5
164.8
175.1
185.4
195.7
206.0
0.412
1.5
1.5 2.0
3.9 8.3
7.8
11.7
15.6
19.5
23.4
27.3 57.9
31.2 66.2
35.1
39.0 82.7
42.9
46.8
50.7
54.6 115.8
58.5
62.4 132.4
66.3 140.7
70.2
74.1
78.0 165.5
0.156
16.5
24.8
33.1
41.3
49.6
74.5
91.0
99.3
107.6
124.1
148.9
157.2
0.331
4.8.9
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 110 litres, an additional
vessel may be installed if required on
old system with a recommended descaling agent.
Also check pipework and renew any corroded pipework or fittings. Valve glands must
be repacked or replaced wherever necessary and any defective controls exchanged.
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.
Installation to an existing central heating
4.8.10
4.9 DOMESTIC WATER
Hard water areas
If the area of installation is recognized as a
hard water, it is recommended that a suitable
water treatment device is installed in the
mains.
The water hardness can be determined by
using the standard test paper or by referring to local water authority.
system
The combination boiler is designed to oper-
4.9.1
The domestic hot water must be in accorate on a sealed system only. Therefore if dance with the relevant recommendations
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
of BS 5546. Copper tubing to BS 2871. 1 is
recommended for water carrying pipework
and MUST be used for pipework carrying
potable water.
boiler to an existing system flush out the
13
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 electricity supply must be readily accessible
and adjacent to the appliance except,
where the appliance is installed in a bath-
room, this MUST be sited outside the bath-
room.
Fig. 10
SECTION
5.1
5.1.1
5.2
5.2.1
5 INSTALLATION
WARNING
It is MOST IMPORTANT that this appliance
is installed in a VERTICAL POSITION, with
the flue air duct passing through the wall in
a HORIZONTAL PLANE. A minor deviation
from the horizontal is acceptable, provided
that this results in a downward slope of the
flue/air duct away from the combination
boiler.
DELIVERY
The appliance will arrive on site in two
cartons:
Boiler carton containing (Fig. 10-l 1):
a) boiler fully assembled
b) installation instructions and
user instructions
c) white paper template
d) terminal cover plate (Fig. 12)
e) - 4 coach bolts and wall plugs
- screws and dowels
Polythene bag containing:
a) 2-22 mm compression ball valves
(heating)
b) 1-15 mm compression ball valve
(with drain screw for domestic cold
water inlet)
c) 1-1/2” BSP Union gas cock
d) - 2 15 mm flanged copper tails complete
with 1/2” brass nuts and washers
- 2 22 mm flanged copper tails complete
with 3/4" brass nuts and washers
Fig. 11
14
FLUE BOX CONTAINING (Fig. 12):
Standard Flue Assembly
60
- Air intake duct
61
- Flue exhaust duct
62
-Terminal
65
-Pipe centering spring
127
-Terminal Cover Plate
(Contained in the carton Fig. 10)
Fig. 12
OPTIONAL EXTRAS:
Flue bend carton containing: (Fig. 13)
57 Flue bend supplied as an extra cost only when
requested
59 Rubber seal 0 60
FLUE EXTENSION BOX CONTAINING (Fig. 14):
1000 mm flue extension duct as an extra cost only
when requested for side and vertical flue applications
Fig. 13
Fig. 14
59 Rubber seal 0 60
63 -Air intake duct extension
64 - Flue exhaust duct extension
65 - Pipe centering spring
WARNING:
Maximum allowable flue length 3.5 m horizontal or
4.5 m vertical (Fig. 3) or page 21.
maximum No. 3x800 mm vertical No. 4x800 mm.
Flue duct extension used with standard flue
15
5.3 UNPACKING
Fig. 18
4) Rest the boiler on the floor and remove
the polystyrene guards
2) Rest the carton on
the floor (keeping the flaps open)
Fig. 19
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