Ravenheat CS 80 T Operating manual

Technical and illustrative data are not binding and can be modified without prior notice.
The descriptions and illustrations in the present booklet are for guidance purposes only.
RAVENHEAT MANUFACTURING LTD
CHARTISTS WAY, MORLEY, LEEDS, U.K. LS27 9ET
TEL.: [phone] - FAX: [phone]
Website: www.ravenheat.co.uk - E-mail: [e-mail]
Instructions for Use
Installation and Servicing
To be left with the user
CS 80 (T)
Natural Gas (G20) II2H3P G. C. No. 4758146
LPG (G31) II2H3P G.C. No. 4758147
CS 90 (T)
Natural Gas (G20) II2H3P G. C. No. 4758148
LPG (G31) II2H3P G.C. No. 4758149
1312
HIGH EFFICIENCY
CONDENSING
COMBINATION BOILER

2

3
HIGH
EFFICIENCY CONDENSING BOILER
EFFICIENCY CONDENSING BOILER
FOR CENTRAL HEATINGAN
FOR CENTRAL HEATING AND DOMESTIC HOT WATER
This new highly efficient turbo-modulating boiler is designed to meet domestic hot water and central heating requirements at
super high efficiency.
POSITION
The appliance is extremely versatile as it can be fitted in almost any room. The appliance is room sealed so there is no contact
between the combustion chamber and living accommodation. This guarantees maximum safety and efficiency. 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 services are available throughout the UK Mainland. This product is guaranteed by
Ravenheat manufacturing ltd, Chartists Way, Morley, LEEDS, LS27 9ET. Telephone No [phone].
Guaranteeisafull12monthsfromdateofpurchaseprovidingtheappliancehasbeenfittedinaccordancewiththeseinstructions
and relevant codes of practice.
-
Gas valve.
Gas valve.
- Variable head pump suitable for any type of central heating system.
- Variable head pump suitable for any type of central heating system.
- Burner with flame stabiliser designed to operate under all thermal conditions.
- Burner with flame stabiliser designed to operate under all thermal conditions.
- Unique
- Unique
condensing heat exchanger
condensing heat exchanger
for high thermal flue transfer from gases to water.
for high thermal flue transfer from gases to water.
- Stainless steel plate heat exchanger for super high heat transfer to domestic hot water supply.
- Stainless steel plate heat exchanger for super high heat transfer to domestic hot water supply.
- Built in frost protection.
- Built in frost protection.
- Printed circuit board designed to connect to room stat and/or timer.
- Printed circuit board designed to connect to room stat and/or timer.
- Aesthetically pleasing panels and controls.
- Aesthetically pleasing panels and controls.
- On/Off ball valves for shutting off gas, central heating and domestic hot water circuit.
- On/Off ball valves for shutting off gas, central heating and domestic hot water circuit.
- Safety relief valve (for safety discharge).
- Safety relief valve (for safety discharge).
- Programmable 7 day module with digital display (time clock version only).
- Programmable 7 day module with digital display (time clock version only).
NOTE: Due to the high
efficiency of thi
efficiency of this boiler a plume of water vapour will form at the flue
terminal during operation.
COSHH - CONTROL OF SUBSTANCES
HAZARDOUS TO HEALTH
HAZARDOUS TO HEALTH
IMPORTANT
IMPORTANT
It is the Users/Installers responsibility to ensure that the necessary personal protective clothing is worn when
handling this appliance, and where applicable the pertinent parts that contain any materials that could be interpreted
as being injurious to health and safety.
GENERAL INFORMATION:
GLUES AND SEALANTS - exercise caution - if these are still in liquid form.
RAVENHEAT use only high quality material for production of this product, in an effort to protect the environment
wherever possible components should be recycled.
WARNING: when installing the appliance, care should be taken to avoid any possibility of injury when handling sheet
metal parts.
MAJOR COMPONENTS

4
Users instructions
Sections Page Sections Page
1 Users guide 6 5 Installation 25
1.1 Introduction 6 5.1 Warning 25
1.2 Clearances around the appliance 6 5.2 Delivery 25
1.3 Operating safety checks to protect 6 5.3 Unpacking of boiler 25
your appliance (checking the system 5.4 Positioning of the boiler 25
pressure) 5.5 Optional extras 26
1.4 Appliance status indicators 7 5.6 Plume management kit 27
1.5 Digital display 8 5.7 Installing the appliance for rear flue 28
1.6 Boiler value 8 outlet
1.7 Time 8 5.8 Installing the appliance for side flue 28
1.8 Programming the heating times 9 outlet
1.9 Diagnostic 9 5.9 Completing horizontal flue installation 31
5.10 Intake and exhaust terminal 31
components
2 General layout 10 5.11 In-line flue bend and flue extension 31
2.1 Operating scheme 11 5.12 Vertical flue instructions 32
2.2 Introduction 12 5.13 Installation instructions for twin flue 34
2.3 Description of control system and 12 pipe
sequence of operation 5.14 Twin flue instructions 34
2.4 Domestic hot water mode 12 5.15 Exhaust / suction system with 35
2.5 Central heating mode 12 concentric pipes for flat or sloping
2.6 General function 12 roofs.
2.7 Overall dimension 13 Extensions with two separate pipes
2.8 Safety device 13 5.16 Exhaust / suction system with two 35
2.9 Available pump head 13 separate rated 80 dia. pipes
2.10 Pressure drop across appliance 13 exhaust on flat or sloping roof, suction
from vertical wall
3 Technical data WH 80(T) natural gas 14 5.17 Exhaust / suction system with two 35
3.1 Technical data WH 80(T) LPG 15 separate pipes through a single
3.2 Technical data WH 90(T) natural gas 16 vertical wall
3.3 Technical data WH 90(T) LPG 17 5.18 Installation instructions for 80/125 36
concentric flue system
4 General requirements 18 5.19 Assemble boiler 37
4.1 Safety 18 5.20 Fitting valve pack 37
Gas safety (Installation and use) 5.21 Gas connection 37
4.2 General information 18 5.22 Central heating connection 37
4.3 Location of boiler 19 5.23 Domestic hot water connection 37
4.4 Clearances around the appliance 19 5.24 Position of water/gas connections 37
4.5 Important notice 19 5.25 Safety valve discharge 38
4.6 Gas supply 19 5.26 Condensate drain connection 38
4.7 Flue system 20 5.27 Converting the appliance to different 39
4.8 Air supply 20 gas types
4.9 Water circulation (central heating) 20 5.28 Electrical connections 39
4.10 Flue terminal position 21 5.29 Outdoor sensor 39
4.11 Pipework 22
4.12 Boiler interlock control 22 6 Commissioning 40
4.13 Draining tap 22 6.1 Gas supply installation 40
4.14 Air release points 23 6.2 Electrical installation 40
4.15 Mains water feed: central heating 23 6.3 Initial filling of the system 40
4.16 Permissible methods of filling 23 6.4 Setting the heating system 40
4.17 Sizing of additional expansion vessel 24 design pressure
4.18 Installation to an existing central 24 6.5 Filling the hot water system 40
heating system 6.6 Lighting the boiler 40
4.19 Water treatment 25 6.8 Check the gas pressure 41
4.20 Hard water areas 25 6.9 Combustion check 41
4.21 Domestic water 25 6.10 Checking the flue system 42
4.22 Electrical supply 25

5
Sections Page Sections Page
6.11 Checking the heating thermostat 42 11 Spare parts 55
6.12 Testing/regulating the D.H.W flow 42
6.13 Keep hot 42 12 Benchmark commissioning 60
6.14 C.H. high/low temperature 42 checklist details
6.15 Range rating central heating or/and 43 12.1 Analyser check list 65
domestic hot water
6.16 Test mode 43
6.17 Instructing the user 43
7 Servicing instructions 44
7.1 Boiler frost protection 44
7.2 To inspect and clean the appliance 45
8 Replacements of parts 45
8.1 General 45
8.2 To remove front panel 45
8.3 To remove left and right panels 46
8.4 To remove/replace spark igniter box 46
8.5 To remove/replace fan 46
8.6 To remove/replace the electrodes 47
8.7 To remove/replace the burner 47
8.8 To remove/replace the heat 47
exchanger
8.9 To remove/replace expansion 48
vessel
8.10 To remove/replace gas valve 48
8.11 To remove/replace plate heat 48
exchanger
8.12 To remove/replace the water 48
pressure transducer
8.13 To remove/replace diverter valve 49
motor
8.14 To remove/replace C.H. diverter 49
valve
8.15 To remove/replace D.H.W. diverter 49
valve mechanism
8.16 To remove/replace pump 49
8.17 To remove/replace automatic air vent 49
8.18 To remove/replace safety relief valve 50
8.19 To remove/replace D.H.W. sensor 50
8.20 To remove/replace C.H. flow and 50
return sensors
8.21 To remove/replace flue sensor 50
8.22 To clean and remove/replace 50
condensing trap
8.23 To remove panel control box 51
8.24 To remove the instrument panel 51
8.25 To remove/replace control board 51
8.26 To remove/replace digital display 51
board
8.27 External control connection 51
9 Fault finding Central heating 52
9.1 Fault finding Domestic Hot Water 53
10 Electrical system diagram 54

6
It is the law that all gas appliances are installed by
a competent person, in accordance with the gas
safety installation and to the current Gas Safety
(Installation and Use) Regulations B.S.5440:2-(2000).
All registered installers carry a Gas Safe Register ID card
and have a registration number. Both should be recorded in
your boiler Log book. You can check your installer’s
registration at www.gassaferegister.co.uk.
ESCAPE OF GAS
Should a gas leak be suspected, contact your gas
supplier without delay.
GAS EMERGENCY NUMBER: 0800111999
Do NOT search for gas leaks with a naked flame.
WARNING: This appliance must be earthed.
1.1 INTRODUCTION
Please carefully read the information given in this
booklet to help you gain maximum control from your
appliance with minimum trouble and cost.
Your Ravenheat Condensing Low Nox combination boiler
has been designed to supply your Central Heating and
Domestic Hot Water directly from one unit.
When Central Heating is operating, the circulation will be
interrupted when Domestic Hot Water is being drawn off
(domestic hot water has priority).
This will normally not affect the level of Heating.
PLEASE NOTE:
Due to the high efficiency of this appliance and resulting
low flue gas exhaust temperature a white plume of
condensation vapour (cool steam) will be emitted from the
flue outlet terminal, this is quite normal. It will be
particularly evident during periods of low outdoor
temperature or when the boiler is working at its optimum
performance (Plume Management kits are available on
request).
IMPORTANT:
In the unlikely event of the exhaust flue gases exceeding
the overheat temperature setting, the boiler operation will
be stopped to prevent damage to the appliance.
1.2 CLEARANCES AROUND THE APPLIANCE
Side clearance:
The position of the appliance must provide a
minimum clearance of only 5 mm as the side panels
do not require removing for servicing.
However, if the option is preferred to remove the
panels then a minimum clearance of 55 mm is
required.
Top clearance:
The top clearance should be a minimum of
125 mm.
Bottom clearance:
A minimum bottom clearance of 80 mm is
A minimum bottom clearance of 80 mm is
required between the appliance
required between the appliance and any surface,
though 150 mm is preferred whenever
possible.
Front clearance:
A minimum of 450 mm is required in front of
the appliance for access during servicing, the
front clearance can be reduced when installed
in a cupboard to 25 mm from the access door.
USER CONTROLS
USER CONTROLS
This appliance is designed to operate with the minimum
This appliance is designed to operate with the minimum
of ease for the user.All the controls are found on the
of ease for the user.All the controls are found on the
control panel on the front of the boiler.
control panel on the front of the boiler.
1.3 OPERATING SAFETY CHECKS TO PROTECT
1.3 OPERATING SAFETY CHECKS TO PROTECT
YOUR APPLIANCE (CHECKING THE SYSTEM
YOUR APPLIANCE (CHECKING THE SYSTEM
PRESSURE)
PRESSURE)
Before lighting the appliance check that the Central
Before lighting the appliance check that the Central
Heating system pressure is not less than 1 bar. If it
Heating system pressure is not less than 1 bar. If it
is below this it will be ecessary to re-pressurise the
is below this it will be ecessary to re-pressurise the
system, between 1 and 1.5 bar to allow the boiler to
system, between 1 and 1.5 bar to allow the boiler to
operate. To view the system pressure press the P button
operate. To view the system pressure press the P button
once, this will display the current pressure
once, this will display the current pressure
(if the
(if the
pressure is on nil or too low, then error code 08E is
pressure is on nil or too low, then error code 08E is
displayed).
displayed).
A filling device (filling loop) will have been fitted on the
A filling device (filling loop) will have been fitted on the
system.
system.
This is usually on the pipework near to the boiler. If you
This is usually on the pipework near to the boiler. If you
are unsure of its position, or you cannot identify it, consult
are unsure of its position, or you cannot identify it, consult
the installer who fitted the boiler.
the installer who fitted the boiler.
The filling loop usually consists of two taps and a
The filling loop usually consists of two taps and a
separate silver coloured braided flexible pipe with
separate silver coloured braided flexible pipe with
connection fittings. Only when re-pressurising should the
connection fittings. Only when re-pressurising should the
braided flexible pipe be connected between the two taps,
braided flexible pipe be connected between the two taps,
ensure that the nuts or the pipe ends are tightened
ensure that the nuts or the pipe ends are tightened
onto the taps.
onto the taps.
Fully open one of the taps first and then while monitoring
Fully open one of the taps first and then while monitoring
the water pressure on the digital display, carefully open
the water pressure on the digital display, carefully open
the second tap. When the water pressure is to a
the second tap. When the water pressure is to a
maximum of 1.5 bar turn both taps off.
maximum of 1.5 bar turn both taps off.
Disconnect the flexible pipe from the taps (a small
Disconnect the flexible pipe from the taps (a small
amount of water may be present).
amount of water may be present).
Keep the pipe in a safe place for future use.
Keep the pipe in a safe place for future use.
Press the P button once to return to the main screen.
Press the P button once to return to the main screen.
In the event of an error, the appliance will show a
In the event of an error, the appliance will show a
sequence code displayed on the digital display of the
sequence code displayed on the digital display of the
control panel (fig. 1). By pressing the “RESET“
control panel (fig. 1). By pressing the “RESET“
button it is possible to relight the boiler (see page 51
button it is possible to relight the boiler (see page 51
for list of error codes).
for list of error codes).
1 USERS GUIDE

7
1.4 APPLIANCE STATUS INDICATORS
Your boiler is equipped with a large LCD display
that indicates the appliance operating status
(fig. 1).
After a long period switched off (no power
supply), the first switch on the internal backup
circuit will charge in order to
maintain time
maintain time
and update parameters. The screen will display
and update parameters. The screen will display
CLOW, after a few minutes of power su
CLOW, after a few minutes of power supply the
display will be charged enough to allow all the
functions.
Fig. 1
During the initial charge time, the display doesn’t
allow the visualisation and/or modification function
parameters. Instead other functions are working.
When the appliance operates in rest mode, the
display shows the boiler temperature and, for the
time clock version only, the time. Alternatively the
digital display also shows the water pressure.
KEY:
1 - ON/OFF button.
Press to turn the boiler ON, “SUM” (hot water
only) “WIN” (hot water and heating if set) and
OFF.
Press the button also to confirm selections.
2 - Press to reset the appliance if ever an error
code is displayed.
3/4 - Temperature and function mode selectors.
Press the arrow up or the arrow down to
increase or decrease the heating or domestic
hot water outlet temperature, when the digital
display is in hot water or domestic set-point
temperature.
Press also to show the boiler values or to
show the options program when the digital
display is in menu setting.
5 - Press to set the Central Heating
Temperature required
(when in winter mode).
Press the arrow up or the arrow down buttons
to increase or decrease the temperature.
6 - Press to set the Domestic Hot Water
Temperature required.
Press the arrow up or the arrow down buttons
to increase or decrease the temperature.
7 - TIMER MODE (time clock version only).
Press to select “Auto” (heating times set), “Manual”
(heating on all the time) and off (heating off).
8 - Press to show the boiler values.
Use the arrow up and arrow down buttons to select
the following information:
PBAR: water pressure
SFAN: speed fan (the display shows 3 digits
(e.g. 500 = 5000 rpm)
TFLOW: flow temperature
TRET: return temperature
TDHW: domestic hot water temperature
PWR: % power of modulation.
- Press for 3 seconds to enter into menu.
Use the arrow up or arrow down buttons to select
the following options:
- TIME (time clock version only): It is possible to
set the time and the current day (Monday 1,
Tuesday 2, Wednesday 3, Thursday 4, Friday 5,
Saturday 6, Sunday 7), see section 1.7.
- PTMR (only time clock version): It is possible to set
the timer, see section 1.8.
- BOIL: It is possible to set the boiler parameters
C.H. max fan speed
D.H.W. max fan speed
Keep hot: “0” disabled and “1” enabled
C.H. High/Low temperature: “1” high/“2” low.

8
1.6 BOILER VALUE
It is possible to show the boiler value.
Press P button to show the boiler value.
Use the arrow up and the arrow down
Use the arrow up and the arrow down
buttons, (item 3 and
buttons, (item 3 and 4 fig. 1) to show the
following info:
PBAR: water pressure
SFAN: speed fan
TFlow: flow temperature
TRet: return temperature
TDHW: domestic hot water temperature
PWR: % power of modulation.
1.7 TIME (
time clock
time clock version only)
SETTING THE TIME AND DAY
(time clock
(time clock
version only):
1. Press and hold the P button for 4 seconds.
2. Press the up and down arrows to select
“TIME” and then press the enter button.
3. Press the up and down arrows to select the
current hour (24h). Then press the enter
button.
4. Press the up and down arrows to select the
current minute and then press the enter
button.
5. Press the up and down arrows to select the
current day (1=Mon, 2= Tue etc.) and then
press the enter button.
The time is now set.
KEY
1 - Day indicator:
(time clock version only)
1. Monday
1. Monday
2. Tuesday
2. Tuesday
3. Wednesday
3. Wednesday
4. Thursday
4. Thursday
5. Friday
5. Friday
6. Saturday
6. Saturday
7. Sunday
7. Sunday
2 - Time (time clock version only).
2 - Time (time clock version only).
3 - Central Heating: when the appliance
3 - Central Heating: when the appliance
is in central heating mode icon 3 will be
is in central heating mode icon 3 will be
flashing.
flashing.
4 - Auto (time clock version only): when the
4 - Auto (time clock version only): when the
digital clock is in automatic function icon 4
digital clock is in automatic function icon 4
is displayed.
is displayed.
5 - Water pressure: Shows the current
5 - Water pressure: Shows the current
pressure in the system.
pressure in the system.
6 - Manual: When the digital timer is set to
6 - Manual: When the digital timer is set to
manual icon 6 is displayed, in this mode the
manual icon 6 is displayed, in this mode the
central heating is on permanently.
central heating is on permanently.
1.5 DIGITAL DISPLAY
Fig. 2
7 - ON/OFF: When the appliance is
ON icon 7 is displayed.
8 - Modulation flame level: When the burner is lit, 3
different levels on icon 8 are displayed.
9 - Day function (
time clock
time clock version only).
10 - Temperature.
11 - Anomaly - Lock - out - Test function.
12 - Domestic hot water: when the appliance is in
domestic hot water mode the icon will flash.

1.8 PROGRAMMING THE HEATING TIMES
(
time clock vers
time clock version only)
The appliance incorporates a digital clock
programmed with a default heating pattern
(see table 1); however this can be modified to
suit individual needs.
To change the programmed times:
1. Press and hold the P button for 3 seconds.
2. Press the up and down arrows to select
“P TMR” and then press the enter button.
3. Press the up and down arrows to select the
individual day you wish to set, or select the
group of days (see table 2) then press the
enter button.
4. Press the up and down arrows to select the
ON1 time (first on time) and press the enter
button.
5. Press the up and down arrows to set the
OF1 time (first off) and press enter.
Repeat this process for the remaining 3
settings. (Note: if not all 4 times are required
then set the remaining on and off times to
24.00, this cancels the remaining on and off.
For example see the weekend settings in
(table 1.)
TABLE 1
TABLE 2
9
Once the times are set, press the P button and
this will return to the main screen.
NB: If setting the times in a group, the days in
the group will all be the same, however days
not in this group will remain at the default time.
For example, setting Mon-Sat
For example, setting Mon-Sat will change all
these days but Sunday will remain the same as
table one unless changed individually.
The programmed times will only be activated
when the boiler is in winter mode (section 1.4
key 1) and also set in auto mode (section 1.4
key 7). If you wish to override these times, press
the timer mode button to select “MAN”, this puts
the boiler in manual mode which overrides the
timer on the boiler so the heating is on
permanently (providing any external controls
fitted are calling for heat). To turn the heating off,
press the timer mode button to select off, this
will now turn the heating off permanently until
either auto or manual is selected.
1.9 DIAGNOSTIC
1.9 DIAGNOSTIC
The display shows eventual error or faulty
The display shows eventual error or faulty
message.
message.
Stop boiler: The boiler stops the operating cycle
Stop boiler: The boiler stops the operating cycle
and waits for the disappearance of the cause of
and waits for the disappearance of the cause of
the error in order to go back to be operating
the error in order to go back to be operating
mode.
mode.
Block boiler: The boiler requires a manual reset
Block boiler: The boiler requires a manual reset
to become operational again.
to become operational again.

10
KEY
1 - Condensate trap
2 - Gas valve
3 - Gas inlet
4 - Drain point
5 - CH flow
6 - Diverter valve motor
7 - DHW outlet
8 - DHW sensor
9 - DHWflow detector
10 - DHW inlet
11-Safety pressure relief valve
12-Water pressure transducer
13- CH return
14- Control board
15-Circulation pump
16- Automatic air vent
17- Condensate drain
18- Expansion vessel
19- Main heatexchanger
20- Spark electrode
21- Sensing electrode
22- Flue temperaturesensor
23 - Spark igniter
24- Fan
25 - Burner
26- Manual air vent
27 - Overheat cutoffthermostat
28 - CH flowsensor
29 - CH return sensor
2.0 GENERAL LAYOUT (Fig. 3)
Fig. 3

11
KEY
1 - Flue exhaust manifold
2 - Condensate drain
3 - CH return
4 - CH return sensor
5 - Heat exchanger
6 - CH flow
7 - Overheat cut off thermostat
8 - CH flow sensor
9 - Manual air vent
10 - Burner
11 - Spark electrode
12 - Sensor electrode
13 - Fan
14 - Flue
temperature
temperature sensor
15 - Expansion vessel
16 - Automatic air vent
17 - Circulation pump
18 - Water pressure transducer
19 -Safety pressure reliefvalve
20 - Diverter valve motor
21 - Plate heat exchanger
22 - DHW sensor
23- Gas valve
24- Gas service cock
25- CH compression ballvalves
26- DHW flow sensor
27- DHW compression ballvalves
2.1 OPERATING SCHEME (Fig. 4)
Fig. 4

As the heating sensor reaches temperature
the fan speed modulates to maintain the
temperature set on the display panel.
When starting, the fan will always start at the
set-point speed.
The boiler is fitted with an anti-cycling device
on the control board. This delays the boiler
from re-firing within 10 minutes.
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.
2.6 GENERAL FUNCTION
The instrument panel permits regulation of the
boiler to partial heating requirements, between
maximum and minimum settings.
Air and gas are 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 automatically
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 connection
terminals for this thermostat, as well as for
a
external timer if required. The
external timer if required. The burner
continues to operate until it is stopped by the
digital clock or one of the thermostats.
When the internal C.H. temperature sensor
or the room thermostat intervenes the burner
shuts down. The fan stops but the pump
continues to operate for 3 minutes.
The boiler also incorporates an anti-block
system which powers the pump every 24
hours, allowing it to 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.
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 transfer of heat is very high
because the two fluids move in a counter
direction.
Select the winter position by summer/winter
button (item 1 fig. 1).
2.2 INTRODUCTION
This boiler is designed for the production of
central heating and domestic hot water
combined in one unit.
It is fitted with an automatic domestic hot
water priority valve.
It is possible to select either a summer or
It is possible to select either a summer or
winter function.
winter function.
With the summer position only being for
With the summer position only being for
domestic hot water.
domestic hot water.
The winter position being for central heating
The winter position being for central heating
with domestic hot water priority.
with domestic hot water priority.
2.3
2.3
DESCRIPTION OF CONTROL SYSTEM
DESCRIPTION OF CONTROL SYSTEM
AND SEQUENCE OF OPERATION
AND SEQUENCE OF OPERATION
2.4 Domestic hot water mode
2.4 Domestic hot water mode
When the appliance is in rest mode,
When the appliance is in rest mode,
select the summer position by pressing
select the summer position by pressing
the ON/OFF button (item 1 fig. 1) please
the ON/OFF button (item 1 fig. 1) please
ensure that the heating circuit is charged
ensure that the heating circuit is charged
with water (above 1 bar).
with water (above 1 bar).
If the domestic hot water tap is turned
If the domestic hot water tap is turned
on the boiler will function in the
on the boiler will function in the
following sequence:
following sequence:
The pump starts. The fan starts and sends a
signal back to the ignition board that the fan is
running.
The spark ignition system is powered which in
turn commences the spark igniter to operate
and light the burner.
At this point the ignition board opens the gas
valve to light the burner.
When the electrode sensor senses the signal
that the burner is alight, the spark igniter
stops.
The fan speed settings on the boiler increases
The fan speed settings on the boiler increases
to the maximum permissible speed over
to the maximum permissible speed over
a period of 5 seconds and will remain at its
a period of 5 seconds and will remain at its
maximum required power until its maximum
maximum required power until its maximum
regulated temperature is achieved and then
regulated temperature is achieved and then
will modulate to maintain this.
will modulate to maintain this.
When the domestic hot water tap is closed the
When the domestic hot water tap is closed the
diverter valve goes back into rest mode, the
diverter valve goes back into rest mode, the
burnerisshutdownalongwith thefanwhichis
burner is shut down along with the fan which is
also switched off.
also switched off.
2.5 Central heating mode
2.5 Central heating mode
If the appliance is in winter mode with a
If the appliance is in winter mode with a
demand for heat to supply radiators, etc. ,
demand for heat to supply radiators, etc. ,
with the heating circuit fully cha
with the heating circuit fully charged above
1 bar, so as to operate the low water sensor
device the boiler will start in the same way
as domestic hot water mode.
12

13
When a hot water tap is turned on the diverter
When a hot water tap is turned on the diverter
valve motor moves to exclude the central
valve motor moves to exclude the central
heating circuit, the boiler automatically
heating circuit, the boiler automatically
modulates to maintain the domestic hot water
modulates to maintain the domestic hot water
at a constant temperature.
at a constant temperature.
The water temperature can be regulated by
The water temperature can be regulated by
the digital display.
the digital display.
When domestic hot water is being drawn off
When domestic hot water is being drawn off
the burner and pump perform as they do
the burner and pump perform as they do
during central heating except that the burner
during central heating except that the burner
is commanded by the D.H.W. thermostat.
is commanded by the D.H.W. thermostat.
When D.H.W. is no longer called for (tap is
When D.H.W. is no longer called for (tap is
turned off), the boiler will automatically return
turned off), the boiler will automatically return
to the central heating mode.
to the central heating mode.
Select the summer position by pressing the
Select the summer position by pressing the
summer/winter button. The boiler functions
summer/winter button. The boiler functions
like an automatic gas hot water heater.
like an automatic gas hot water heater.
When D.H.W. is no longer required the
When D.H.W. is no longer required the
burner and pump and fan will immediately
burner and pump and fan will immediately
turn off.
turn off.
This also takes place when in winter mode,
if there is no demand for heat to the central
heating system or until the digital clock and
room thermostat (if fitted) demands the
central heating circuit.
2.8 SAFETY DEVICE
In both central heating and domestic hot
water mode safe operation is ensured by a
control board which shuts off the main
burner, if the fan stops or the flue or
combustion air intake duct is obstructed.
An overheat cut off thermostat acts to turn
An overheat cut off thermostat acts to turn
off the burner to resettable “lockout”.
off the burner to resettable “lockout”.
A safety valve is fitted on the central heating
circuit set at 3 bar.
A low water pressure switch set at 0.4 bar is
fitted on heating circuit, to prevent the boiler
operating below this boiler system pressure.
2.7 OVERALL DIMENSION
(Fig. 5)
2.10 PRESSURE DROP ACROSS
APPLIANCE (Fig. 7)
2.9 AVAILABLE PUMP HEAD
(Fig. 6)
Fig. 5

NOMINAL HEAT INPUT NET QMS 20.0 kW
MINIMUM HEAT INPUT NET 3.7 kW
NOMINAL HEAT OUTPUT 19.5 kW
NOMINAL HEAT OUTPUT CONDENSING 21.4 kW
MINIMUM HEAT OUTPUT 3.6 kW
MINIMUM HEAT OUTPUT CONDENSING 4.0 kW
GAS RATE max 2.1 m3/h
AFTER 10 MINUTES min 0.4 m3/h
INLET PRESSURE 20 mbar
FAN SPEED Max 4200 rpm - 140 Hz Combustion % CO2: 9.0 (+ 0.5 / - 0.5) Case ON
C.H. min 1300 rpm - 43 Hz 9.0 (+ 0.5 / - 0.5) Case OFF
ELECTRICAL SUPPLY 230 V ~ 50 HZ
POWER CONSUMPTION 110 W
EXTERNAL FUSE RATING 3A
INTERNAL FUSE F1 - 3.15 A (20 mm to BS 4265)
DRY WEIGHT 28 kg
WATER CONTENT C.H. 0.8 litre
WATER CONTENT 0.2 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 compression valve
SAFETY DISCHARGE C.H. 15 mm copper pipe
CONDENSATION DRAIN 3/4” (21.5 mm) push fit over flow
MAX COLD WATER CAPACITY WITHOUTADDITIONAL 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 80 °C min 35 °C
DESIGN FLOW RATE 1066 I/h 20 °C RISE
MINIMUM FLOW RATE C.H. 350 I/h
D.H.W. FLOW RATE 30 °C rise 11.9 l/min
D.H.W. FLOW RATE 35 °C rise 10.2 l/min
D.H.W. FLOW RATE 40 °C rise 8.9 l/min 10°C inlet temperature
D.H.W. TEMPERATURE Max 60 °C min 35 °C
FAN SPEED D.H.W. Max 4800 rpm - 160 Hz min 1300 rpm - 43 Hz
Qmw Input Net Max 25.4 kW min 3.7 kW
D.H.W. PRESSURE PMW Max 6.5 bar
D.H.W. PRESSURE PMW min 0.5 bar
D.H.W. MINIMUM FLOW RATE 2.5 I/min
FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers (If required)
DESTINATION: GB, IE CATEGORY II2H3P
FLUE TYPE - C13 - C33 - C53 NOX5 SEDBUK A IP X4 D
3TECHNICAL DATA CS 80 (T)
TABLE 3/A NATURAL GAS (G 20) П2H3P
14

3.1 TECHNICAL DATA CS 80 (T)
TABLE 3/B LPG ( G 31) П2H3P
NOMINAL HEAT INPUT NET QMS 20.0 kW
MINIMUM HEAT INPUT NET 3.7 kW
NOMINAL HEAT OUTPUT 19.5 kW
NOMINAL HEAT OUTPUT CONDENSING 21.4 kW
MINIMUM HEAT OUTPUT 3.6 kW
MINIMUM HEAT OUTPUT CONDENSING 4.0 kW
GAS RATE max G31 0.8 m3/h
AFTER 10 MINUTES min 0.15 m3/h
INLET PRESSURE G31 37 mbar
FAN SPEED C.H. Max 4200 rpm - 140 Hz
Combustion
Combustion % CO2 : 10.5 (+ 0.5 / - 0.5) Case ON
min 1300 rpm - 43 Hz 10.5 (+ 0.5 / - 0.5) Case OFF
ELECTRICAL SUPPLY 230 V ~ 50 HZ
POWER CONSUMPTION 110 W
EXTERNAL FUSE RATING 3A
INTERNAL FUSE F1 - 3.15 A (20 mm to BS 4265)
DRY WEIGHT 28 kg
WATER CONTENT C.H. 0.8 litre
WATER CONTENT 0.2 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 compression valve
SAFETY DISCHARGE C.H. 15 mm copper pipe
CONDENSATION DRAIN 3/4” (21.5 mm) push fit over flow
MAX COLD WATER CAPACITY WITHOUTADDITIONAL 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 80 °C min 35 °C
DESIGN FLOW RATE 1066 I/h 20 °C RISE
MINIMUM FLOW RATE C.H. 350 I/h
D.H.W. FLOW RATE 30 °C rise 11.9 l/min
D.H.W. FLOW RATE 35 °C rise 10.2 l/min
D.H.W. FLOW RATE 40 °C rise 8.9 l/min 10°C inlet temperature
D.H.W. TEMPERATURE Max 60 °C min 35 °C
FAN SPEED D.H.W. Max 4800 rpm - 160 Hz min 1300 rpm - 43 Hz
Qmw Input Net Max 25.4 kW min 3.7 kW
D.H.W. PRESSURE PMW Max 6.5 bar (147 p.s.i.)
D.H.W. PRESSURE PMW min 0.5 bar (118 p.s.i.)
D.H.W. MINIMUM FLOW RATE 2.5 I/min
FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers (If required)
DESTINATION: GB, IE CATEGORY II2H3P
FLUE TYPE - C13 - C33 - C53 NOX5 SEDBUK A IP X4 D
15

16
NOMINAL HEAT INPUT NET QMS 24.5 kW
MINIMUM HEAT INPUT NET 4.1 kW
NOMINAL HEAT OUTPUT 23.9 kW
NOMINAL HEAT OUTPUT CONDENSING 26.4 kW
MINIMUM HEAT OUTPUT 4.0 kW
MINIMUM HEAT OUTPUT CONDENSING 4.4 kW
GAS RATE max 2.6 m3/h
AFTER 10 MINUTES min 0.4 m3/h
INLET PRESSURE 20 mbar
FAN SPEED Max 4200 rpm - 140 Hz Combustion % CO2: 9.0 (+ 0.5 / - 0.5) Case ON
C.H. min 1300 rpm - 43 Hz 9.0 (+ 0.5 / - 0.5) Case OFF
ELECTRICAL SUPPLY 230 V ~ 50 HZ
POWER CONSUMPTION 119 W
EXTERNAL FUSE RATING 3A
INTERNAL FUSE F1 - 3.15 A (20 mm to BS 4265)
DRY WEIGHT 29 kg
WATER CONTENT C.H. 0.8 litre
WATER CONTENT 0.2 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 compression valve
SAFETY DISCHARGE C.H. 15 mm copper pipe
CONDENSATION DRAIN 3/4” (21.5 mm) push fit over flow
MAX COLD WATER CAPACITY WITHOUTADDITIONAL 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 80 °C min 35 °C
DESIGN FLOW RATE 1264 I/h 20 °C RISE
MINIMUM FLOW RATE C.H. 350 I/h
D.H.W. FLOW RATE 30 °C rise 14.1 l/min
D.H.W. FLOW RATE 35 °C rise 12.1 l/min
D.H.W. FLOW RATE 40 °C rise 10.5 l/min 10°C inlet temperature
D.H.W. TEMPERATURE Max 60 °C min 35 °C
FAN SPEED D.H.W. Max 4800 rpm - 160 Hz min 1300 rpm - 43 Hz
Qmw Input Net Max 30.1 kW min 4.1 kW
D.H.W. PRESSURE PMW Max 6.5 bar
D.H.W. PRESSURE PMW min 0.5 bar
D.H.W. MINIMUM FLOW RATE 2.5 I/min
FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers (If required)
DESTINATION: GB, IE CATEGORY II2H3P
FLUE TYPE - C13 - C33 - C53 NOX5 SEDBUK A IP X4 D
3.2 TECHNICAL DATA
TABLE 3/C CS 90 (T)
NATURAL GAS (G 20) П2H3P

17
NOMINAL HEAT INPUT NET QMS 24.5 kW
MINIMUM HEAT INPUT NET 4.1 kW
NOMINAL HEAT OUTPUT 23.9 kW
NOMINAL HEAT OUTPUT CONDENSING 26.4 kW
MINIMUM HEAT OUTPUT 4.0 kW
MINIMUM HEAT OUTPUT CONDENSING 4.4 kW
GAS RATE max G31 1.0 m3/h
AFTER 10 MINUTES min 0.16 m3/h
INLET PRESSURE G31 37 mbar G30 28-30 mbar
FAN SPEED C.H. Max 4200 rpm - 140 Hz Combustion % CO2 : 10.5 (+ 0.5 / - 0.5) Case ON
min 1300 rpm - 43 Hz 10.5 (+ 0.5 / - 0.5) Case OFF
ELECTRICAL SUPPLY 230 V ~ 50 HZ
POWER CONSUMPTION 119 W
EXTERNAL FUSE RATING 3A
INTERNAL FUSE F1 - 3.15 A (20 mm to BS 4265)
DRY WEIGHT 29 kg
WATER CONTENT C.H. 0.8 litre
WATER CONTENT 0.2 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 compression valve
SAFETY DISCHARGE C.H. 15 mm copper pipe
CONDENSATION DRAIN 3/4” (21.5 mm) push fit over flow
MAX COLD WATER CAPACITY WITHOUTADDITIONAL 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 80 °C min 35 °C
DESIGN FLOW RATE 1264 I/h 20 °C RISE
MINIMUM FLOW RATE C.H. 350 I/h
D.H.W. FLOW RATE 30 °C rise 14.1 l/min
D.H.W. FLOW RATE 35 °C rise 12.1 l/min
D.H.W. FLOW RATE 40 °C rise 10.5 l/min 10°C inlet temperature
D.H.W. TEMPERATURE Max 60 °C min 35 °C
FAN SPEED D.H.W. Max 4800 rpm - 160 Hz min 1300 rpm - 43 Hz
Qmw Input Net Max 30.1 kW min 4.1 kW
D.H.W. PRESSURE PMW Max 6.5 bar
D.H.W. PRESSURE PMW min 0.5 bar
D.H.W. MINIMUM FLOW RATE 2.5 I/min
FLUE OUTLET NOM. DIAMETER 100 mm specially supplied with boilers (If required)
DESTINATION: GB, IE CATEGORY II2H3P
FLUE TYPE - C13 - C33 - C53 NOX5 SEDBUK A IP X4 D
3.3 TECHNICAL DATA
TABLE 3/D CS 90 (T)
LPG (G 31) П2H3P

18
BS5546: Installation of gas hot water
supplies domestic purposes
(2nd Family Gases).
BS5440: Flues (for gas appliances of rated
input not exceeding 70 kW).
BS5440: 2 Ventilation (for gas appliances of
rated input not exceeding 70 kW).
BSEN 677: 1998 Gas fired central heating
boilers.
I.S. 813: Domestic gas Installations.
The followings standards give
valuable
valuable
additional information:
additional information:
BS 7074: Expansion vessels and ancillary
equipment
equipment for sealed water system.
BS 7593: Treatment of water in domestic hot
water and central heating system.
Health & Safety Document No.635
The Electricity at Work Regulations, 1989.
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.
Itcould also infringetheGasSafetyregulations
and the above regulations.
NOTE:
The Ravenheat CS 80/90 (T) combi boiler has
been tested and examined by CERTIGAZ, and
is certified to comply with PrEN 483 and BS
EN 625.
Manufacturers instructions must NOT be taken
in any way as overriding statutory obligations.
If in doubt on any point please consult
Ravenheat.
4GENERAL REQUIREMENTS
4.1 SAFETY
Gas Safety (Installation and Use).
Regulations.
It is law that all gas appliances are installed
andservicedbya GasSaferegisteredinstaller
in accordance with the above regulations and
these installation instructions. All registered
installerscarry aGasSafe I.D.cardand havea
registration number. Both should be recorded
in your Benchmark commissioning checklist.
You can check your installer on the Gas Safe
register (www.gassaferegister.co.uk). Failure
to install appliances correctly could lead to
prosecution. It is in your own interest, and that
of your safety, to ensure the law is complied
with. Check the boiler and flue is the correct
type for installation undertaken.
The installation of the boiler MUST be in
The installation of the boiler MUST be in
accordance with the latest I.E.E. (BS 7671)
accordance with the latest I.E.E. (BS 7671)
Wiring Regulations, local building regulations,
Wiring Regulations, local building regulations,
bye-laws of the local water authority, the
buildingregulationsandtheBuildingStandards
(Scotland) and any relevant requirements of
the local authority.
4.2 GENERAL INFORMATION
Both the user and the manufacturer rely
Both the user and the manufacturer rely
heavily on the installer, whose job it is
heavily on the installer, whose job it is
to install the combination boiler and
to install the combination boiler and
connect it to a correctly designed heating
connect it to a correctly designed heating
system. Acquaint yourself with the relevan
system. Acquaint yourself with the relevan
British Standards concerning installation
British Standards concerning installation
requirements. If you need further advice on
requirements. If you need further advice on
any points contact the Technical Services
any points contact the Technical Services
Office on 0113 2527007 who would be
Office on 0113 2527007 who would be
pleased to help. It is recommended that tools
pleased to help. It is recommended that tools
suitable for brass fittings are used, and have
suitable for brass fittings are used, and have
a capability to accommodate hexagon sizes
a capability to accommodate hexagon sizes
up to 50 mm.
up to 50 mm.
APPLICABLE CODES OF PRACTICE
Ref: Documents.
Detailedrecommendationsarecontainedinthe
following British Standard Codes of Practice:
BS6891:2005: Low pressure installation
pipes.
BS6798: Installation of gas fired hot water
boilers of rated input not exceeding
70 kW.
BSEN12828: Design for water based heating
systems.
BSEN12831: Heating systems in buildings,
Method for calculation of the
design heat load.
BSEN14336: Installation & commissioning
of water based heating
systems.

19
4.3 LOCATION OF BOILER
Siting of Ravenheat CS 80/90 (T) 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 the boiler must be allowed
for.
Ravenheat CS 80/90 (T) combi boiler m
Ravenheat CS 80/90 (T) combi boiler must
be fitted on a flat and vertical wall capable of
adequately supporting the weight of the boiler
and any ancillary equipment.
The appliance may be fitted on a combustible
wall insulation between the wall and the boiler
is not necessary, unless required by the local
authority.
For electrical safety reasons there must be no
access available from the back of the boiler.
The boiler must not be fitted outside.
LPG versions of this appliance shall not be
installed in cellars or basements.
4.4 CLEARANCES AROUND THE APPLIANCE
Side clearance:
The position of the appliance must provide
minimum clearance of 5mm as the side panels.
Top clearance:
The top clearance should be a minimum of
125 mm.
Bottom clearance:
A bottom clearance of 80 mm is required
between the appliance and any surface.
Though 150 mm is preferred whenever
possible.
Front clearance:
A minimum of 450 mm is required in front of
the appliance for access during servicing, the
front clearance can be reduced when installed
in a cupboard, to 25 mm from the access door.
4.5 IMPORTANT NOTICE
For installation into timber framed buildings,
please refer to the Institute of Gas Engineers
Document IGE/UP/7.
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 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 situated so that it
cannot be touched by a person using a bath
or shower.
A compartment when 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 CS 80/90 (T) combi boiler
have been examined by CERTIGAZ
notification body, and are 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.
4.6 GAS SUPPLY
A gas meter is connected to the service pipe
by the Local Gas Region or the Local Gas
Region contractor. An existing meter should
be checked preferably by the Gas Region to
ensure that the meter is adequate to deal with
therateof gassupplyrequiredfor allappliances
it serves. Installation pipes should be fitted in
accordance with BS 6891:2005. Pipework from
the meter to the boiler must be of adequate size
(22 mm) min to within at least one metre of
the boiler, (15 mm) min. can then be used for
remaining pipe work to the appliance.Asmaller
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. It is the
responsibility of the Gas Installer
responsibility of the Gas Installer
to size the gas installation pipework in
to size the gas installation pipework in
accordance with BS 6891:2005. Whilst the
accordance with BS 6891:2005. Whilst the
principle of the 1:1 gas valve ensures t
principle of the 1:1 gas valve ensures the
Ravenheat range
Ravenheat range is able to deliver the full
output at an inlet pressures as low as 14
mbar, other gas appliances in the property
may not be as tolerant.
When operating pressures are found to be
below the minimum meter outlet of 19 mbar
these should be checked to ensure this is
adequate for correct and safe operation.

20
Allowing for the acceptable pressure loss of 1
mbar across the installation pipework, it can be
assumed that a minimum permitted operating
pressure of 18 mbar (nat gas) will be delivered
to the inlet of the appliance. (reference BS
6400-1 Clause 6.2 Pressure Absorption).
The external gas cock could further reduce the
operating pressure when measure
d at its
d at its test
point. The pressure drop is relative to the heat
input to the boiler (kW), refer to graph below.
4.7 FLUE SYSTEM
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 (section 4.10).
The terminal must not be l
ocated in a place
ocated in a place
where it is likely to cause a nuisance in cold
where it is likely to cause a nuisance in cold
and/or humid weather as water vapour may
and/or humid weather as water vapour may
condense on leaving the flue terminal.
condense on leaving the flue terminal.
The effect of such pluming must be
The effect of such pluming must be
considered.
considered.
The terminal must not be closer than 25 mm
The terminal must not be closer than 25 mm
(1 inch) to any combustible material for
(1 inch) 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 flue lengths see alternative flue
instructions. Flue must be positioned in a
place not likely to cause a nuisance from
pluming.
IMPORTANT NOTICE: If the flue terminates
below a balcony, above the ground, above a
flat roof to which people have access, then
a suitable terminal guard must be fitted if
less than 2 metres high. The part number is
less than 2 metres high. The part number is
PRO110100.
PRO110100.
Fit only recommended
Fit only recommended
FLUE TERMINAL
FLUE TERMINAL
GUARD
GUARD
b
by securing concentrically around
terminal with screws.
Available on request from:
Ravenheat Manufacturing ltd
Chartists Way, 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
times.
times.
Minimum acceptable spacing from the terminal to
obstructions and ventilation openings are
specified in section 4.10.
Note positions: Due to the terminal design,
installation is possible with clearances less than
those specified in BS 5440, Part 1
NOTE:
The flue must be terminated in a place not
likely to cause a nuisance.
A concentric vertical flue kit is available for
longer flueing applications (see table 5 page
26).
For further details see vertical flue installation
instructions.
4.8 AIR SUPPLY
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.
4.9 WATER CIRCULATION (Central heating)
Detailed recommendations are given in BS6798
2009/5449:1990 - BSEN12828 - BSEN12831
- BSEN14336 (for smallbore and microbore
central heating systems). The following notes
are given for general guidance.