ideal Classic RS 330 User guide
Wall hung, balanced
flue, gas fired boilers
Classic RS 330-360
GENERAL
Table 1 - General Data
Boiler Size RS 330 RS 340 RS 350 RS 360
Gas supply connection Rc 1/2 (1/2) 1/2" (BSP Female)
Flow connection 22mm copper
Return connection 22mm copper
Maximum static water head m (ft.) 30.5 (100)
Minimum static water head m (ft.) 0.45 (1.5)
Electrical supply 230 V 50 Hz
Fuse rating External: 3A
Water content litre (gal.) 3.65 (0.8) 4.6 (1.0)
Dry Weight kg (lb.) 46.3 (107.1) 54.2 (119.5)
Maximum installation weight kg (lb.) 34.7 (76.5) 42.7 (94.2)
Boiler size Height mm (in.) 600 (23.6)
Width mm (in.) 380 (15.0)
Depth mm (in.) 300 (11
3/4")
Table 2 - Performance Data
Boiler Size RS 330 RS 340 RS 350 RS 360
Boiler input kW 10.9 14.5 17.8 21.7
(Btu/h) (37 200) (49 500) (60 750) (74 000)
3
Gas consumption l/s (ft
/h) 0.28 (36.1) 0.38 (48.2) 0.46 (58.6) 0.56 (71.3)
Boiler output kW 8.8 11.7 14.7 17.6
(Btu/h) (30 000) (40 000) (50 000) (60 000)
Burner setting pressure (HOT) mbar (in.w.g.) 6.4 (2.6) 11.0 (4.4) 13.1 (5.3) 14.1 (5.7)
Seasonal Efficiency (SEDBUK)* Band D [78.4]% [78.9]% [80.3]% [79.0]%
* The value is used in the UK Government's Standard Assessment Procedure (SAP) for energy rating of dwellings.
The test data from which it has been calculated have been certified by a notified body.
To obtain gas consumption
3
(a) For l/s: divide heat input (kW) by C.V. of the gas (Btu/ft
3
(b) For ft
/h; divide by C.V. of the gas (Btu/ft3).
)
Heat inputs are preset to the highest nominal rating.
CAUTION.
To avoid the possibility of injury during the installation, servicing or cleaning of this
appliance, care should be taken when handling edges of sheet steel components
2
Classic RS -
Installation & Servicing
GENERAL
Classic RS
Data Badge: on top of the controls support
B.G. Certified - P.I. No. 87AP108
Destination Countries: GB & IE Appliance type: C
Models G.C. Appliance No.
Classic RS 330 .............................41 392 09
Classic RS 340 .............................41 392 10
Classic RS 350 .............................41 392 11
Classic RS 360 .............................41 392 12
Key to symbols
IE
= Ireland
GB
= United Kingdom
PMS = Maximum operating pressure of water
= A room sealed appliance designed for connection
C
12
via ducts to a horizontal terminal, which admits
fresh air to the burner and discharges the products
of combustion to the outside through orifices which,
in this case, are concentric.
= An appliance designed for use on 2nd Family gas,
I
2H
Group H only.
Natural Gas only: I
2H
12
CONTENTS
Air Supply. ...................................................................... 6
Boiler Assembly - Exploded view ................................. 8
Boiler Clearances .......................................................... 5
Burner Assembly - Exploded view ............................. 31
Electrical Connections ................................................ 15
Electrical Diagram ....................................................... 15
Electrical Supply ............................................................ 7
Fault Finding .................................................................28
Flue Fitting ....................................................................14
Flue Installation .............................................................. 6
Gas Safety Regulations ................................................. 4
Gas Supply ..................................................................... 6
Health & Safety Document No 635 ............................... 4
Initial Lighting ............................................................... 19
Installation ..................................................................... 8
Mandatory Requirements ............................................. 4
Pump ............................................................................ 10
Servicing ...................................................................... 21
Short List of Parts ....................................................... 29
System Diagrams ........................................................ 16
Terminal Guards. ........................................................... 6
Water and Systems ...................................................... 7
For GB, to comply with Building Regulations Part L1 (Part J in Scotland) the boiler should be fitted in accordance with the
manufacturer's instructions. Self-certification that the boiler has been installed to comply with Building Regulations can be
demonstrated by completing and signing the Benchmark log book.
BENCHMARK LOG BOOK DETAILS
Boiler Page
Make and model .......................................................3
Appliance serial no. on data badge ..........................8
SEDBUK No. % .........................................................2
Controls
Time and temperature control to heating ......... 16/17
Time and temperature control to hot water ...... 16/17
Heating zone valves .......................................... 16/17
TRV's .........................................................................7
Auto bypass ............................................................... 7
Boiler interlock ..........................................................7
For all boilers
Flushing to BS.7593 .................................................7
Inhibitor......................................................................7
Central heating mode
Heat input ................................................. to be calculated
Burner operating pressure ....... measure and record
Central heating flow temp. ........ measure and record
Central heating return temp. ..... measure and record
For combination boilers only
Scale reducer ......................................................... n/a
Hot water mode
Heat input ............................................................... n/a
Max. operating burner pressure ............................n/a
Max. operating water pressure ..............................n/a
Cold water inlet temp ............................................. n/a
Hot water outlet temp. ............................................n/a
Water flow rate at max. setting ...............................n/a
For condensing boilers only
Condensate drain .................................................. n/a
For all boilers:
For assistance see Technical Helpline on the back page
complete, sign & hand over to customer
Page
Classic RS -
Installation & Servicing
3
GENERAL
INTRODUCTION
The Classic RS 330-360 is a range of automatically fully
controlled, wall mounted, balanced flue, gas boilers.
The boiler casing is of white enamelled mild steel.
The boilers are supplied with a standard flue kit, suitable for
rear outlet applications from 229mm (9") to 305mm (12").
The boilers are suitable for connection to pumped, open
vented central heating systems; pumped central heating
combined with pumped or gravity indirect domestic hot water
systems; gravity or pumped indirect domestic hot water supply
systems.
See Frame 1 for details of the correct boiler tappings to use.
The boiler casing has a removable controls pod containing a
drop-down door. The boiler thermostat is located behind the
drop-down door.
OPTIONAL EXTRA KITS
Programmer kit fits neatly within the casing. Separate
fitting instructions are included with this
kit.
Extension ducts up to 394 mm (15 1/2").
Overheat allows the boiler to be used on sealed
Thermostat Kit systems.
Sealed System Unit fits on top of the appliance
GAS SAFETY
CURRENT GAS SAFETY (INSTALLATION AND USE)
REGULATIONS OR RULES IN FORCE.
The appliance is suitable only for installation in GB and IE and
should be installed in accordance with the rules in force.
In GB, the installation must be carried out by a CORGI
Registered Installer. It must be carried out in accordance with
the relevant requirements of the:
• Gas Safety (Installation and Use) Regulations
• The appropriate Building Regulations either The Building
Regulations, The Building Regulations (Scotland), Building
Regulations (northern Ireland).
• The Water Fittings Regulations or Water byelaws in
Scotland.
• The Current I.E.E. Wiring Regulations.
Where no specific instructions are given, reference should be
made to the relevant British Standard Code of Practice.
In IE, the installation must be carried out by a Competent Person
and installed in accordance with the current edition of I.S.813
"Domestic Gas Installations", the current Building Regulations
and reference should be made to the current ETCI rules for
electrical installation.
Detailed recommendations are contained in the following British
Standard Codes of Practice:
BS. 6891 Low pressure installation pipes.
BS. 6798 Installation of gas fired hot water boilers of rated
input not exceeding 60 kW.
BS. 5449 Forced circulation hot water systems.
BS. 5546 Installation of gas hot water supplies for domestic
purposes (2nd Family Gases).
BS. 5440: Part 1 Flues for gas appliances of rated input not
exceeding 60 kW.
BS. 5440: Part 2 Ventilation for gas appliances of rated input
not exceeding 60 kW.
BS 7593 Treatment of water in Domestic Hot Water Central
Heating Systems.
Health & Safety Document No. 635.
The Electricity at Work Regulations, 1989.
Manufacturer’s notes must NOT be taken in any way as
overriding statutory obligations.
IMPORTANT. These appliances are certificated by the British
Standards Institution for safety and performance. It is important,
therefore, that no external control devices, e.g. flue dampers,
economisers etc., are directly connected to these appliances
unless covered by these Installation and Servicing instructions
or otherwise recommended by Caradon Ideal Limited in writing.
If in doubt please enquire.
Any direct connection of a control device not approved by
Caradon Ideal Limited could invalidate the BSI Certification and
the normal appliance warranty. It could also infringe the Gas
Safety Regulations and the above regulations.
SAFE HANDLING OF SUBSTANCES
Care should be taken when handling the boiler insulation
panels, which can cause irritation to the skin. No asbestos,
mercury or CFCs are included in any part of the boiler.
LOCATION OF BOILER
The boiler must be installed on a flat and vertical wall, capable
of adequately supporting the weight of the boiler and any
ancillary equipment.
The boiler may be fitted on a combustible wall and insulation
between the wall and the boiler is not necessary - unless
required by the local authority.
The boiler must not be fitted outside.
Timber Framed Buildings
If the boiler is to be fitted in a timber framed building it should be
fitted in accordance with the Institute of Gas Engineering document
IGE/UP/7:1998.
Bathrooms
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. (BS 7671) Wiring Regulations and, in Scotland, the electrical
provisions of the building regulations applicable in Scotland with
respect to the installation of the boiler in a room or internal space
containing a bath or shower. For Ireland reference should be
made to the current ETCI rules for electrical installations and
I.S. 813: 2002.
Where a room-sealed appliance is installed in a room containing
a bath or shower then the appliance and any electrical switch or
appliance control utilising mains electricity should be so situated
that it cannot be touched by a person using the bath or shower.
Where installation will be in an unusual location, special
procedures may be necessary and BS.6798 gives detailed
guidance on this aspect.
......continued on page 6.
NOTE TO THE INSTALLER:
LEAVE THESE
INSTRUCTIONS ADJACENT TO THE GAS METER.
ALSO COMPLETE THE BENCHMARK LOG BOOK
AND GIVE THIS TO THE CUSTOMER.
4
Classic RS -
Installation & Servicing
1
BOILER WATER CONNECTIONS
1. This appliance is NOT suitable for use in a direct hot
water system.
2. If the boiler is to be used on a sealed system, an
Overheat Thermostat Kit is available and must be
installed in accordance with the instructions supplied with
the kit.
3. If the boiler is to be used for gravity domestic hot water
supply then cut off the spun ends of the gravity flow and
return pipes and fit a 22 mm to 28 mm copper connection
at the boiler gravity flow and return connections, in order
to run the gravity circuits in 28 mm pipe.
2
BOILER CLEARANCES
The following minimum clearances must
be maintained for operation and
servicing. Additional space will be
required for installation, depending upon
site conditions.
GENERAL
Front clearance: 450mm
3/4") from the front of
(17
the boiler casing.
Minimum front clearance
when built in to cupboard is
75mm (3")
If using the Classic Sealed System
Unit then refer to the instructions
packed with the unit for the necessary
clearances.
Gravity flow pipe
Pumped return pipe
FRONT VIEW SIDE VIEW
Gravity
380 (15")
332 (13")
232 (9
1/8
")
return
pipe
Pumped
flow pipe
300 (12")
31
(1
1/4"
)
Classic RS -
Flue terminal
Gas conn.
Cla 6035
Installation & Servicing
130 (5
1/8
600
(24")
200
(8")
")
Gas
conn.
(1
48
7/8
")
30
(1
1/8
")
5
GENERAL
Compartment Installations
A compartment used to enclose the boiler MUST be designed and
constructed specially for this purpose. An existing cupboard or
compartment may be used, providing it is modified for the purpose.
In both cases details of essential features of cupboards/
compartment design, including airing cupboard installation, are
to conform to the following:
!!
! BS. 6798.
!!
!!
! The position selected for installation MUST allow adequate
!!
space for servicing in front of the boiler and for air circulation
around the boiler; see section on 'Air Supply'.
! For the minimum clearances required for safety and
subsequent service, see Frame 2. In addition, sufficient
boiler clearance may be required to allow lifting access to
the wall mounting plate.
GAS SUPPLY
The local gas supplier should be consulted, at the installation
planning stage, in order to establish the availability of an adequate
supply of gas. An existing service pipe must NOT be used without
prior consultation with the local gas supplier.
A gas meter can only be connected by the local gas supplier or by
a local regional contractor.
An existing meter should be checked, preferably by the gas supplier,
to ensure that the meter is adequate to deal with the rate of gas
supply required. A minimum gas pressure of 20 mbar MUST be
available at the boiler inlet, with the boiler operating.
Installation pipes MUST be fitted in accordance with BS. 6891. In
IE refer to I.S. 813:2002. Pipework from the meter to the boiler
MUST be of an adequate size.
The complete installation MUST be tested for gas soundness and
purged as described in the above code.
FLUE INSTALLATION
Pluming may occur at the terminal so terminal positions which
would cause a nuisance should be avoided.
The flue must be installed in accordance with the
recommendations of BS. 5440-1:2000. In IE refer to I.S. 813:2002.
The following notes are intended for general guidance:-
1. The boiler MUST be installed so that the terminal is exposed
to external air.
2. It is important that the position of the terminal allows the free
passage of air across it at all times.
3. Minimum acceptable spacing from the terminal to
obstructions and ventilation openings are specified in Table
3.
4. Where the lowest part of the terminal is fitted less than 2m
(6' 6") above a balcony, above ground or above a flat roof to
which people have access then the terminal MUST be protected
by a purpose designed guard.
Terminals guards are available from boiler suppliers. Ask for
TFC Flue Guard, Model A. In case of difficulty seek advice from:
Grasslin (UK) Ltd., Tower House, Vale Rise, Tonbridge,
Kent TN9 1TB.
Tel: +44 (0) 1732 359 888. Fax: +44 (0) 1732 354 445
www.tfc-group.co.uk
Ensure that the guard is fitted centrally.
Table 3 - Balanced flue terminal position
Terminal Position
1a. Directly BELOW an opening, 600mm 1500mm
air brick, opening window etc. (24") (60")
1b. Directly ABOVE an opening, 300mm 300mm
air brick, opening window etc. (12") (12")
1c. HORIZONTALLY to an opening, 400mm 600mm
air brick, opening window etc. (16") (24")
2. Below guttering, drain pipes or
soil pipes 300 mm (12")
3. Below eaves 300 mm (12")
4. Below balconies or a car port roof 600 mm (24")
5. From vertical drain pipes or 300 mm (12")
soil pipes
6. From an internal or external corner or
to a boundary alongside the terminal 600 mm (24")
7. Above adjacent ground, roof or
balcony level 300 mm (12")
8. From a surface or a boundary
facing the terminal 600 mm (24")
9. From a terminal facing a terminal 600 mm (24")
10. From an opening in a car port
(e.g. door or window) into dwelling 1200 mm (48")
11. Vertically from a terminal on the
same wall 1500 mm (60")
12. Horizontally from a terminal on
the wall 300 mm (12")
5. If a natural draught terminal is fitted less than 1m below a
plastic gutter or less than 0.5m below painted eaves or any
other painted surface a suitable shield at least 1m long
should be fitted to protect the surface.
6. The air inlet/products outlet duct and the terminal of the boiler
MUST NOT be closer than 25mm (1") to combustible material.
Detailed recommendations on the protection of combustible
material are given in BS.5440-1:2000. In IE refer to I.S. 813:2002.
IMPORTANT. It is absolutely ESSENTIAL to ensure, in practice,
that products of combustion discharging from the terminal cannot
re-enter the building or any other adjacent building through
ventilators, windows, doors, other sources of natural air infiltration
or forced ventilation/air conditioning.
If this should occur, the appliance MUST be turned OFF, labelled
'unsafe' and corrective action taken.
Minimum Spacing
330-340 350-360
TERMINAL
The terminal assembly can be adapted to accommodate various
wall thicknesses. Refer to Frame 4 - Unpacking.
AIR SUPPLY
Detailed recommendations for air supply are given in BS.5440:2.
In IE refer to I.S. 813:2002.
The following notes are for general guidance:
1. It is NOT necessary to have a purpose provided air vent in the
room or internal space in which the boiler is installed.
2. If the boiler is to be installed in a cupboard or compartment,
permanent air vents are required (for cooling purposes) in the
cupboard/compartment, at both high and low levels. The air
vents must either communicate with room/internal space, or
be direct to outside air. The minimum effective areas of the
permanent air vents, required in the cupboard/compartment,
are specified in Table 4 and are related to maximum rated heat
input.
6
Classic RS -
Installation & Servicing
GENERAL
3. Both air vents MUST communicate with the same room or
internal space or MUST be on the same wall to outside air.
4. In siting the air vents care must be taken to avoid the freezing of
pipework.
Table 4 - High and low vent areas
Boiler Air from room/internal Air direct
Space cm
RS 330 102 (16) 51 (8)
RS 340 135 (21) 68 (11)
RS 350 170 (26) 83 (13)
RS 360 198 (31) 102 (16)
2
(in.2) Outside cm2 (in.2)
WATER CIRCULATION SYSTEM
The boiler must NOT be used for direct hot water supply. For the
types of system and correct piping procedure refer to 'Introduction'
and Frame 1.
The central heating system should be in accordance with
BS. 6798 and, in addition, for smallbore and microbore systems,
BS. 5449.
The domestic hot water system, if applicable, should be in
accordance with the relevant recommendations of BS. 5546.
Copper tubing to BS. 2871:1 is recommended for water carrying
pipework.
The hot water storage cylinder MUST be of the indirect type and
should preferably be manufactured of copper.
Single feed, indirect cylinders are not recommended and MUST
NOT be used on sealed systems.
The hot water cylinder and ancillary pipework not forming part of
the useful heating surface should be lagged to prevent heat loss
and any possible freezing - particularly where pipes run through
roof spaces and ventilated underfloor spaces.
IMPORTANT. The boiler must be vented
For sealed system installations copper tubing to BS2871:1 MUST
be used throughout the heating system
Draining taps MUST be located in accessible positions, which
permit the draining of the whole system - including the boiler and
hot water storage vessel. They should be at least 1/2" BSP nominal
size and be in accordance with BS. 2879.
The boiler is fitted with a special drain plug (provided) to drain the
BOILER ONLY, in the event of the system drain plug being unable
to do so. The hydraulic resistance of the boilers, at MAXIMUM
OUTPUT with an 110C (20 0F) temperature differential, are shown
in Table 5.
Table 5 - Water flow rate and pressure loss
Boiler Size RS 330 RS 340 RS 350 RS 360
(not on sealed systems.)
Caradon Ideal Limited recommend Water Treatment in
accordance with the
Treatment in Central Heating Systems.
Caradon Ideal Limited recommend the use of Fernox, GE Betz
Sentinel or Salamander water treatment products, which must
be used on accordance with the manufacturers instructions.
For further information contact:
Fernox Manufacturing Co. Ltd, Cookson Electronics, Forsyth Road,
Sheerwater, Woking, Surrey. GU21 5RZ. Tel. +44 (0) 1799 521133
or
G E Betz Ltd, Sentinel Division, Foundry Lane, Widnes, Cheshire,
WA8 8UD. Tel. +44 (0) 151 424 5351
or
Salamander Engineering Ltd, Unit 24, Reddicap Trading Estate,
Sutton Coldfield, West Midlands B75 7BU. Tel. +44 (0) 121 378 0952
Notes.
Benchmark
Guidance Notes on Water
1. It is most important that the correct concentration of the water
treatment products is maintained in accordance with the
manufacturers' instructions.
2. If the boiler is installed in an existing system any unsuitable
additives MUST be removed by thorough cleansing.
BS7593:1992 details the steps necessary to clean a
domestic heating system.
3. In hard water areas, treatment to prevent limescale may be
necessary - however the use of artificially softened water is
NOT permitted.
4. Under no circumstances should the boiler be fired before the
system has been thoroughly flushed.
BOILER CONTROL INTERLOCKS
Caradon Ideal Limited recommend that heating systems utilising
full thermostatic radiator valve control of temperature in individual
rooms should also be fitted with a room thermostat controlling the
temperature in a space served by radiators not fitted with such a
valve as stated in BS. 5449.
Central heating systems controls should be installed to ensure the
boiler is switched off when there is no demand for heating or hot water.
When thermostatic radiator valves are used, the space heating
temperature control over a living / dining area or hallway having a
heating requirement of at least 10% of the boiler heat output should
be achieved using a room thermostat, whilst other rooms are
individually controlled by thermostatic radiator valves. However, if
the system employs thermostatic radiator valves on all radiators,
or two port valves without end switches, then a bypass circuit must
be fitted with an automatic bypass valve to ensure a flow of water
should all valves be in the closed position.
Boiler kW 8.8 11.7 14.7 17.6
Output Btu/h 30 000 40 000 50 000 60 000
Water flow l/min 11.4 15.2 19.0 22.9
Rate gal/h 150 200 250 300
Pressure mbar 16.5 22.0 37.5 45
Loss in wg 6.6 9.0 15 18
WATER TREATMENT
These boilers incorporate a cast iron heat exchanger.
IMPORTANT. The application of any other treatment to this
product may render the guarantee of Caradon Ideal Limited
INVALID.
Classic RS -
Installation & Servicing
ELECTRICAL SUPPLY
Wiring external to the appliance MUST be in accordance with the
current I.E.E. (BS. 7671) Wiring Regulations and any local
regulations which apply. For Ireland reference should be made to
the current ETCI rules for electrical installations.
The point of connection to the mains should be readily accessible
and adjacent to the boiler, except for bathroom installations; the
point of connection to the mains MUST be situated outside of the
bathroom.
Where a room sealed appliance is installed in a room
Note.
containing a bath or shower then the appliance and any electrical
switch or appliance control utilising mains electricity should be so
situated that it cannot be touched by a person using the bath or
shower.
7
3
BOILER ASSEMBLY - Exploded View
Classic RS 330 shown
INSTALLATION
INSTALLATION
34
4.2
4.3
5
4.1
47
34
6
2
53
22
25
3
7
LEGEND
1. Heat exchanger
2. Flue baffles
3. Hook bolt kit assy.
4.1 Pipe - RH flow
1
Programmer
18.1
12
5. Pipe - Return assy.
6. Collector hood
7. Combustion chamber
12. Main burner
26
Controls support
Data badge
Clas 1998
25. Boiler thermostat
26. Control thermostat knob
34. Balanced flue terminal
44B. Programmer (optional)
4.2 Pipe - LH flow
4.3 Pipe - Return
8
18.1. Detection electrode
22. Thermostat pocket
47. Gasket, grommet & bush kit
53. Wall mounting plate
Classic RS -
Installation & Servicing
4
UNPACKING
INSTALLATION
The boiler is supplied fully assembled in Pack A, together with a
standard flue assembly for lengths up to 305mm (12") in Pack B.
Unpack and check the contents.
FLUE PACKS Note.
PACK B - contains a balanced flue terminal suitable for wall thicknesses from 229mm (9") to 305mm (12")
PACK B1 - contains a balanced flue terminal suitable for wall thicknesses from 318mm (12
PACK C - contains a balanced flue terminal suitable for wall thicknesses from 114mm (4 1/2") to 191mm (7 1/2")
All flue packs contain 2 sachets of sealant
Pack A Contents
- Hardware Pack (listed below)
- Installation & Servicing Instructions
- User's Instructions.
Hardware Pack
! 50mm x No. 14 wood screw - 3 off
! 50mm x No. 10 wood screw - 3 off
! Wall plug - 6 off
! Cover plate, painted
1/2") to 394mm (15 1/2")
INSTALLATION
Note.
Wall thicknesses outside those specified cannot be accommodated. An overlap of at least 50mm at any duct joint
must be allowed.
5
PACKAGING AND CASING REMOVAL
1. Unpack the boiler
2. Remove the casing as follows and place to one
side to avoid damage.
a. Release the controls pod fixing screws (a) 3 full
turns only.
Remove the pod by pulling it forward to
disengage from the keyhole slots.
b. Undo the 3 screws (b), retaining the casing to
the back panel.
c. Remove the casing in the direction of the
arrows.
3. Remove the boiler from its packaging base. The
boiler may now be stood on its controls support
protection frame to ease handling and installation
4. Unpack the boiler terminal box and, if applicable,
the extension flue box(es).
Classic RS -
Installation & Servicing
9
INSTALLATION
6
OPEN VENT SYSTEM REQUIREMENTS - Fully pumped
The system should be vented directly off the boiler flow pipe, as close to the boiler
as possible. The cold feed entry should be inverted and MUST be positioned
between the pump and the vent, and not more than 150mm (6") away from the
vent connection.
There should be a minimum height - 450mm (18") - of open vent above the cistern
water level. If this is impossible refer below.
The vertical distance between the highest point of the system and the feed/
expansion cistern water level MUST not be less than 450mm (18").
The pump MUST be fitted on the flow side of the boiler.
A suitable pump is a domestic circulator capable of providing an 11°C (20°F)
temperature differential (e.g. Grundfos UPS 15/50 or equivalent). The vertical
distance between the pump and feed/expansion cistern MUST comply with the
INSTALLATION
pump manufacturer's minimum requirements to avoid cavitation. Should these
conditions not apply, either lower the pump position or raise the cistern above the
minimum requirement specified by Caradon Ideal Limited.
A cold water feed must be available back to the boiler when all automatic
Note.
valves are in the closed position (refer to BS. 6798) and, when close coupled, the
feed must not be in a vertical leg.
7
LOW HEAD INSTALLATIONS
The Classic range of boilers can be installed in low head
situations by fitting a 'surge arrester' in the expansion pipe,
as shown.
The following conditions MUST be observed:
1. The surge arrester must be at least 42mm in diameter x
150mm long, thus ensuring a MINIMUM air gap and a
MINIMUM depth of water below the static water level
(cold) of 75mm.
2. The static water level (cold) must be at least 200mm
above the top of the horizontal flow pipe, fitted as shown.
The vent connection MUST NOT be made immediately
off the top of the boiler, as venting is made less efficient.
3. The maximum practical length of 15mm cold feed pipe
should be used in order to reduce the effective volume of
system water expanding into the feed/expansion cistern
to a minimum.
Note.
manufacturers minimum
requirements must be
complied with.
450
(18)
Min.
Return
The pump
75 (3)
Min.
200
(8)
Min.
Feed / expansion
cistern
Water
level
(cold)
22mm
Open vent
System
return
Surge
arrester
75 (3) Min.
Flow
Highest
point of
flow or
return
Connections
to boiler
15mm
Cold
feed
Inverted cold
feed entry
Feed / expansion
cistern
22 (3/4)
Open vent
150
(6)
Max
Max. practical
length
Minimum Requirements
All dimensions in mm (in.)
NB: Imperial dimensions are approximate
450 (18")
Mimimum
450 (18")
Mimimum
150 (6")
Max
System
flow to
pump
Cold
water
level
To pump
8
REQUIREMENTS FOR CORRECT GRAVITY HOT WATER PERFORMANCE
NOTE.
Gravity horizontal pipes should be ABOVE ceiling level and as SHORT as
possible. A MINIMUM inclination of 25mm per 3m run (1" per 10') is required to
avoid air locks. If these conditions cannot be met, pumped primaries MUST be used.
The above graph assumes 8 elbows in the gravity circuit. For each elbow in excess
of 8, (R) must be reduced by 300 mm (12 in.) or (H) increased by 100 mm (4 in.)
10
Classic RS -
Installation & Servicing
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