Natural gas
Class D oil
Dual fuel
340 kW
to
7000 kW
Unical Ellprex
High efficiency steel boiler
Contents Page
General information 2 & 3
Dimensions 4 - 8
Technical Data 4 - 8
Installation requirements 9 & 10
Boiler wiring 11 & 12
Seasonal efficiency of over 84% for outputs of 340 kW and above gives
compliance with ADL2B 2013 for gas-fired boilers without the need for
additional heating credits
Combustion chamber welding detail minimises thermal stress
Very low stand-by losses
Wide range of 2-stage gas and oil, dual-fuel and modulating gas burners
available
Engineering Data Sheet 822/2
January 2016
General information
Operating principles
Ellprex are a range of reverse-flame steel boilers, with the third pass through tubes fitted with turbulators to maximise heat
exchange (see fig 2 below). For models 340 to 630, the combustion chamber is welded to both the front and rear plates.
For models 760 to 7000, the combustion chamber is attached only to the front plate by a double-bevel butt weld (as per
EN 303-1 Table 2). This allows the combustion chamber to freely expand and so minimises metallurgical stress.
Fig 1 Ellprex boiler
Fig 2 Passage of flue gases
Standby loss and operating loss
Standby losses are the sum of heat losses by radiation and convection from the boiler when the burner is not operating.
Reducing these losses makes a significant contribution to high seasonal efficiencies. Ellprex boilers have 80 mm of glass
wool insulation mattress with mineral fibre backing to minimise these losses.
EDS822/2 page2
General information
Application
The Ellprex range are reverse-flame steel boilers, manufactured and tested in accordance with EN 303 -1. The carbon
steel sheet used is to EN 10025 and the boiler tubes are of ST 37.0 steel to DIN 1626. Ellprex are tested in accordance
with the Boiler Efficiency Directive 92/42/EEC. They are suitable for use in LTHW or MTHW heating systems with a
maximum operating pressure of 6.0 bar or 10 bar to special order (see Technical data). Maximum system operating
temperatures are 90°C for LTHW systems and 105°C for MTHW systems.
Ellprex boilers are supplied with Natural gas, Class D oil or Dual fuel burners with 2-stage operation. Modulating burners
are optionally available.
The boiler is suitable for use in either open vented or pressurised heating systems. It is not suitable for use as a direct
water heater. Where wholesome water is required, a matching calorifier or plate heat exchanger must be provided in the
system.
Statutory requirements
Ellprex boilers are CE marked and must be fired by a compatible burner certified to EN676 (gas firing) or EN267 (oil firing)
tocomplywiththeBoiler(Efficiency)Directive 1993.
The installation and commissioning of the boiler must be carried out by a qualified engineer in accordance with the
instructions provided.
Gas supplies and gas burners must be installed and commissioned by a qualified person, eg. a Gas Safe registered
engineer.
Handling
Offloading, dry storing and placing of equipment in the
boiler room is the responsibility of the installer. Lifting
hooks are attached to the boiler.
Equipment must be dry stored and protected from frost.
Cartons must not be crushed or otherwise damaged.
Commissioning
Carnot Consult Ltd undertake commissioning of boilers.
Commissioning charges do not include servicing during the
guarantee period, although this may be carried out under
service contract or to specific order. Boilers should be
commissioned in line with CIBSE Commissioning Code B.
Servicing
The importance of regular maintenance cannot be overemphasised if maximum efficiency is to be maintained.
Customers are strongly advised to place the equipment
under service contract immediately commissioning is
complete.
Installation requirements
Electrical supply (Refer Fig 3)
A 400V 3PH supply is required for most standard burners
offered. The boiler control panel requires an additional
230V 1PH supply.
If a 230V 1PH burner is being used, the fused supply should
be taken to the boiler control panel only. The harness and
connector supplied by Carnot will feed the burner.
The electricity supplies to the burner and boiler control
panel must be wired in accordance with IEE Regulations. A
separate supply and isolating switch is required for each
boiler in the plant room.
All isolating switches and fuses must be provided by the
installer. Burner start/run currents for fuse specification are
available on request. Burner wiring diagrams and technical
data are also available on request.
All connections between the boiler control panel and the
burner are made through harnesses with matching plugs
and sockets, supplied as standard.
Note: Fig 3 is only diagrammatic. Double pole switches with
the required minimum separation must always be used.
Guarantee
Subject to correct handling, installation and operation, all
equipment is guaranteed for twelve months from the date
of despatch. Boiler heat exchangers are guaranteed for a
period of two years from the date of despatch.
The guarantee is not valid if the boiler is not installed in
accordance with these instructions, becomes blocked
with debris and/or carbonate deposits from the system
water and/or there is no documented evidence of
commissioning by a competent engineer.
Boiler Log book
A boiler log book that provides a permanent record of
commissioning and servicing data and measurements is
supplied with every boiler. It is recommended that the
owner ensures that this log book is kept safe and brought
up to date on every occasion that routine or emergency
work is carried out on the boiler.
L1
L2
L3
N
E
Appliance
isolating
Fuse
Harness and connector
by Carnot
switch
EDS822/2 page3
Fig 3 - Electricity supply
Dimensions and Technical data
A
C D
B
hB
HO
Ex
HI
Ø
hBr
W
190 139
Front
Dim ensions
Boiler model 340 420 510
Overall length L mm 1112 1177 1372
Overall w idth W mm 860 890 890
Overall height B mm 1372 1542 1542
Boiler height hB mm 1182 1352 1352
Burner height hBr mm 400 440 440
Boiler flow connection HO DN 80 100 100
Boiler return connection HI DN 80 100 100
Expansion vessel connection Ex Rp 2 2 2
Connection height hHO mm 1310 1485 1485
HO centre from rear A mm 215 255 255
Ex centre from rear C mm 555 540 735
HI centre from rear D mm 805 855 1050
Flue spigot (inside dimension) AA DN 250 250 250
Flue spigot height hAA mm 708 748 748
Drain off cock Doc Rp
L
Side
hHO
AA
hAA
Doc
Rear
Technical data
Nominal heat output (full load) kW 340 420 510
Nominal heat input (full load) ncv kW 371 459 557
Eff iciency at 100% load (ncv) % 91.6 91.5 91.5
Eff iciency at 30% load (ncv) % 93.6 93.9 93.9
Boiler seasonal ef f iciency (1) % 84 84.2 84.2
Oil consumption (ncv) kg/h 31.3 38.7 47
Natural gas consumption (gross cv) m³/h 38.3 47.4 57.5
Dry w eight kg 629 796 919
Water content l 298 398 462
Gas side resistance Pa 333 284 421
Flue gas temperature rise Class D oil °C 164 166 165
Flue gas mass f low (Max) kg/h 568 702 852
Flue gas temperature rise Natural gas °C 152 154 153
Flue gas mass f low (Max) kg/h 557 689 837
CO2in flue gas Class D oil % 12.8 12.8 12.8
CO2in flue gas Natural gas % 9.8 9.8 9.8
Maximum hydraulic w orking pressure bar
Notes: (1) Calculated from the non-domestic building services compliance guide f or conformance w ith ADL2A and
A DL2B 2013 using the formula
Water flow rates and hydrau lic re sis tances
Water f low rate at 15°C temp. rise l/s 5.4 6.7 8.1
Hydraulic resistance at 15°C temp. rise kPa 2.74 1.67 2.45
Min w ater flow rate (2) l/s 2.1 2.6 3.1
Hydraulic resistance at min flow rate kPa 1 1 1
Notes: (2) Minimum boiler return temperature is 55oC
n se asonal = 0.81n
30 %
+ 0.19n
10 0%
EDS822/2 page4
Dimensions and Technical data
A
C D
B
hB
HO
Ex
HI
AA
Ø
hBr
W
200 195
Front
Dim ensions
Boiler model 760 870 970
Overall length L mm 1605 1800 1995
Overall w idth W mm 1122 1122 1122
Overall height B mm 1622 1622 1622
Boiler height hB mm 1432 1432 1432
Burner height hBr mm 480 480 480
Boiler flow connection HO DN
Boiler return connection HI DN
Expansion vessel connection Ex DN
Connection height hHO mm 1540 1540 1540
HO centre from rear A mm 298 298 298
Ex centre from rear C mm 733 928 1123
HI centre from rear D mm 1173 1368 1563
Flue spigot (inside dimension) AA DN
Flue spigot height hAA mm 765 765 765
Drain off cock Doc Rp
L
Side
125
125
65
350
1¼
hHO
hAA
Doc
Rear
Technical data
Nominal heat output (full load) ncv kW 760 870 970
Nominal heat input (full load) ncv kW 830 950 1060
Eff iciency at 100% load (ncv) % 91.5 91.5 91.5
Eff iciency at 30% load (ncv) % 93.9 93.9 93.9
Boiler seasonal ef f iciency (1) % 84.2 84.2 84.2
Oil consumption (ncv) kg/h 70 80.1 89.4
Natural gas consumption (gross cv) m³/h 85.7 98.1 109.5
Dry w eight kg 1341 1447 1553
Water content l 671 753 836
Gas side resistance Pa 500 559 480
Flue gas temperature rise Class D oil °C 173 172 177
Flue gas mass flow (Max) kg/h 1271 1454 1632
Flue gas temperature rise Natural gas °C 161 160 165
Flue gas mass flow (Max) kg/h 1247 1428 1593
CO2in flue gas Class D oil % 12.8 12.8 12.8
CO2in flue gas Natural gas % 9.8 9.8 9.8
Maximum hydraulic w orking pressure bar
Notes: (1) Calculated from the non-domestic building services compliance guide for conformance w ith A DL2A and
A DL2B 2013 using the formula
Water flow rates and hydraulic resis tances
Water f low rate at 15°C temp. rise l/s 12.1 13.9 15.5
Hydraulic resistance at 15°C temp. rise kPa 2.55 3.23 4
Min w ater flow rate (2) l/s 4.6 5.3 5.9
Hydraulic resistance at min flow rate kPa 1 1 1
Notes: (2) Boiler minimum return temperature is 55oC
n se asonal = 0.81n
30 %
+ 0.19n
10 0%
6
EDS822/2 page5
Dimensions and Technical data
A
C D
B
hB
hBr
W
200
Front
Dimensions
Boiler model 1100 1320 1570 1850 2200 2650
Overall length L mm 1952 2292 2282 2652 2692 3014
Overall width W mm 1352 1352 1462 1462 1622 1622
Overall height B mm 1622 1622 1732 1732 1892 1892
Boiler height hB mm 1432 1432 1542 1542 1702 1702
Burner height hBr mm 595 595 640 640 690 690
Boiler flow connection HO DN 150 150 175 175 200 200
Boiler return connection HI DN 150 150 175 175 200 200
Expansion vessel connection Ex DN 80
Connection height hHO mm 1540 1540 1650 1650 1810 1810
HO centre from rear A mm 461 461 561 561 661 662
Ex centre from rear C mm 791 1131 1071 1441 1331 1652
HI centre from rear D mm 1291 1631 1621 1991 2031 2352
Projection of door E mm 207 207 227 227 258 258
Flue spigot (inside dimension) AA DN 400 400 450 450 520 520
Flue spigot height hAA mm 810 810 880 880 950 950
Drain off cock Doc Rp
HOEx
L
Side
HI
Ø
AA
Doc
E
Rear
80
100 100 125 125
1¼
hHO
hAA
Technical data
Nominal heat output (full load) kW 1100 1320 1570 1850 2200 2650
Nominal heat input (full load) ncv kW 1200 1442 1715 2020 2400 2890
Efficiency at 100% load (ncv) % 91.6 91.5 91.5 91.5 91.6 91.6
Efficiency at 30% load (ncv) % 93.9 93.9 93.9 93.9 93.9 93.9
Boiler seasonal efficiency (1) % 84.2 84.2 84.2 84.2 84.2 84.2
Oil consumption (ncv) kg/h 101.2 121.6 144.6 170.3 202.4 243.7
Natural gas consumption (gross cv) m³/h 123.9 148.9 177.1 208.6 247.8 298.4
Dry weight kg 1821 2030 2780 3280 4145 4465
Water content l 1040 1242 1418 1617 2086 2324
Gas side resistance Pa 510 657 588 715 637 745
Flue gas temperature rise Class D oil °C 175 179 177 178 176 175
Flue gas mass flow (Max) kg/h 1837 2208 2626 3093 3675 4425
Flue gas temperature rise Natural gas °C 163 166 165 166 164 163
Flue gas mass flow (Max) kg/h 1803 2167 2577 3036 3607 4344
CO2in flue gas Class D oil % 12.8 12.8 12.8 12.8 12.8 12.8
CO2in flue gas Natural gas % 9.8 9.8 9.8 9.8 9.8 9.8
Maximum hydraulic working pressure bar
Notes: (1) Calculated from the non-domestic building services compliance guide for conformance with ADL2A and
ADL2B 2013 using the formula
Water flow rates and hydraulic resistances
Water flow rate at 15°C temp. rise l/s 17.5 21.1 25 29.5 35.1 42.3
Hydraulic resistance at 15°C temp. rise kPa 2.94 3.43 3.23 4.41 3.33 4.7
Min water flow rate (2) l/s 6.7 8.1 9.6 11.3 13.4 16.2
Hydraulic resistance at min flow rate kPa 1 1 1 1 1 1
Notes: (2) Boiler minimum return temperature is 55oC
n seasonal = 0.81n
30%
+ 0.19n
100%
6
EDS822/2 page6
Dimensions and Technical data
B
hBr
A
HO
C
Ex
D
HI
Ø
AA
Doc
W
F
Front
Dimensions
Boiler model 3000 3500 4000
Overall length L mm 3230 3194 3594
Overall w idth W mm 1720 1970 1970
Overall height B mm 1830 2090 2090
Burner height hBr mm 772 915 915
Boiler flow connection HO DN 200 200 250
Boiler return connection HI DN 200 200 250
Expansion vessel connection Ex DN
Connection height hHO mm 1990 2271 2271
HO centre from rear A mm 325 377 377
Ex centre from rear C mm 1425 1437 1837
HI centre from rear D mm 2755 2717 3257
Boiler door projection E mm 295 325 325
Flue hood projection F mm 340 390 360
Flue spigot (inside dimension) AA DN 570 620 620
Flue spigot height hAA mm 1315 1535 1535
Drain off cock Doc Rp
L
Side
E
Rear
125
1¼
hHO
hAA
Technical data
Nominal heat output (full load) ncv kW 3000 3500 4000
Nominal heat input (full load) ncv kW 3280 3825 4371
Efficiency at 100% load (ncv) % 91.4 91.4 91.5
Efficiency at 30% load (ncv) % 93.9 93.9 93.9
Boiler seasonal efficiency (1) % 84.2 84.2 84.2
Oil consumption (ncv) kg/h 276.6 322.5 368.5
Natural gas consumption (gross cv) m³/h 338.7 395 451.3
Dry w eight kg 5110 6700 7500
Water content l 2667 4142 4455
Gas side resistance Pa 588 764 784
Flue gas temperature rise Class D oil °C 180 180 179
Flue gas mass flow (Max) kg/h 5022 5861 6693
Flue gas temperature rise Natural gas °C 167 167 166
Flue gas mass flow (Max) kg/h 4930 5754 6570
CO2in flue gas Class D oil % 12.8 12.8 12.8
CO2in flue gas Natural gas % 9.8 9.8 9.8
Maximum hydraulic w orking pressure bar
Notes: (1) Calculated from the non-domestic building services compliance guide for conformance w ith ADL2A and
ADL2B 2013 using the formula
Water flow rates and hydraulic resistances
Water flow rate at 15°C temp. rise l/s 47.8 55.8 63.8
Hydraulic resistance at 15°C temp. rise kPa 6.1 8.23 8.33
Min w ater flow rate (2) l/s 18.3 21.4 24.4
Hydraulic resistance at min flow rate kPa 2 2 2
Notes: (2) boiler minimum return temperature is 55oC
n seasonal = 0.81n
30%
+ 0.19n
100%
6
EDS882/2 page7
Dimensions and Technical data
A
B
HO
hBr
W
F
Front
Dim e nsions
Boiler model 4500 5000 5500 6000 6500 7000
Overall length L mm 3820 3820 3970 3970 4380 4380
Overall w idth W mm 2088 2088 2214 2214 2380 2380
Overall height B mm 2533 2553 2663 2663 2860 2860
Burner height hBr mm 987 987 1007 1007 1100 1100
Boiler f low connection HO DN 250 250 250 250 250 250
Boiler return connection HI DN 250 250 250 250 250 250
Expans ion vessel connection Ex DN 125 125 125 125 125 125
Connec tion height hHO mm 2253 2253 2653 2653 2860 2860
HO centre from rear A mm 320 320 320 320 325 325
Ex centre from rear C mm 2025 2025 2175 2175 2920 2920
HI centre from rear D mm 1665 1665 1815 1815 670 670
Projection of door E mm 445 445 465 465 595 595
Flue s pigot (inside dimension) AA DN 660 660 660 660 720 720
Flue s pigot height hA A mm 1437 1437 1550 1550 1650 1650
Drain off cock Doc Rp
C
Ex
Side
D
HI
Ø
AA
Doc
L
E
Rear
1 1/2
hHO
hAA
Technical data
Nominal heat output (full load) kW 4500 5000 5500 6000 6500 7000
Nominal heat input (full load) ncv kW 4838 5421 5914 6506 6989 7590
Efficiency at 100% load (ncv) % 93 92.2 93 93 93 92.2
Efficiency at 30% load (ncv) % 93.65 92.22 93 92.22 93 92.2
Boiler s easonal efficiency (1) % 84.27 83.09 83.79 83.22 83.79 83.07
Oil c onsumption (ncv) kg/h 407.9 457 498.6 548.5 589.2 639.9
Natural gas consumption (gross cv) m³/h 499.5 559.7 610.6 671.7 721.6 783.6
Dry w eight kg 8310 8310 9300 9300 12600 12600
Water content l 6012 6012 7058 7058 7909 7909
Gas side resistance Pa 863 1078 980 1176 1029 1176
Flue gas temperature rise Class D oil °C 180 180 180 180 180 180
Flue gas mass flow (Max) kg/h 7409.6 8302.5 9056.1 9963.1 10702.7 11623.5
Flue gas temperature rise Natural gas °C 170 170 170 170 170 170
Flue gas mass flow (Max) kg/h 7273.3 8149.8 8889.5 9779.7 10505.8 11409.7
CO2in flue gas Class D oil % 12.8 12.8 12.8 12.8 12.8 12.8
CO2in flue gas Natural gas % 9.8 9.8 9.8 9.8 9.8 9.8
Max imum hydraulic w orking pressure bar
Notes : (1) Calculated from the non-domestic building s ervices compliance guide for conformance w ith ADL2A and
ADL2B 2013 using the formula
Wate r flow r ates and hydrau lic re sis tances
Water flow rate at 15°C temp. rise l/s 71.5 79.5 87.4 95.4 103.3 111.3
Hydraulic resistance at 15°C temp. rise mh2o 0.85 1.05 1.15 1.35 1.5 1.75
Hydraulic resistance at 15°C temp. rise kPa 8.3356525 10.296983 11.277648 13.238978 14.709975 17.161638
Min w ater flow rate (2) l/s 35.8 39.8 43.8 47.7 51.7 55.7
Hydraulic resistance at min flow rate kPa 2 2 2 2 2 2
Notes : (2) Boiler minimum return temperature is 55oC
n s eas o n al = 0.81n
30%
+ 0.19n
100%
6
EDS822/2 page8
Installation requirements
Boiler location (See fig 4)
The location chosen for the boiler(s) must be frost free,
provide for a satisfactory flue system and an adequate air
supply for combustion and ventilation. Adequate access is
necessary for boiler and burner servicing.
Boilers must not be installed in areas where inflammable
vapours are likely to be present. To avoid damage to the
boilers, contamination of the combustion air by high levels
of dust or halogenated hydrocarbons (eg. Solvents, spray
can propellants, cleaning agents, adhesives, etc) must be
avoided.
Boilers should be installed on a plinth which is at least
50mm high and is smooth and level. The plinth must
support the entire boiler base, eg minimum dimensions will
be W x L from pages 4 to 7. (NB : For some burners with
acoustic shrouds the plinth may need to be higher - refer
Clyde Sales Office).
Burners
Boilers can be supplied with two stage Natural gas, Class
D oil or Dual fuel burners. Modulating burners are also
available with load-matching control equipment. A choice
of burner makes is available.
Fuel specification
Natural gas (GCV 38.76 MJ/m3) with a minimum gas inlet
pressure according to the burner model specified.
BS2869 Class D oil (35 sec). Advice should be sought
from the oil supplier regarding the storage of Class D oil.
Fuel supply pipework
Install gas or oil supply pipe(s) and service valve(s) so as
to allow free access to the boiler and full opening of the
furnace door without removing the burner from the boiler
door (see below).
Commissioning of the gas supply pipework and
components must be carried out by a qualified person, eg,
a Gas Safe registered engineer. The gas meter and
supply must be sited in accordance with the requirements
of BS6400.
Plant room layout
When planning the layout of the boiler room, allowance
must be made for opening the boiler door, boiler
cleaning and maintenance. The boiler door may be
hinged from the right (as illustrated) or the left.
The table below shows the minimum clearances around
the boiler.
Dimension W2 = length of burner + 200mm.
Dimension L1 = length of boiler (recommended) for
cleaning
Dimension W1 = 1000mm for access to rear of boiler
Dimension W3 = minimum 600mm
W1
W3
L1
W2
Fig 4 Boiler clearances
EDS822/2 page9
Installation requirements
Air supply
Air for ventilation and combustion must be provided for gas
fired boilers in accordance with either BS 6644:2011 or
IGE/UP/10. Air supply for oil fired boilers must conform to
BS 5410 : Part 2.
Chimney design
The Ellprex boiler is designed to operate with a
pressurised combustion chamber and the chimney is not
required to assist the burner in overcoming the boiler
resistance. The chimney must cater for the total internal
resistance of the flue system from each boiler outlet and
not impose an additional load on the burner.
data on pages 4 to 7. A pump overrun facility is necessary
to ensure that water circulation is maintained for at least
three minutes after the boiler is switched off.
The minimum return water temperature for the boiler is
55oC.
There are several ways of providing boiler protection and
minimum flow rates, eg shunt pumps, primary loops, etc.
A typical boiler pump and 3-port valve arrangement is
shown in fig 5.
For multi-boiler systems a ‘reverse return’ pipework
configuration is required to ensure equal distribution of
water flow through the boilers.
Water circulation (See figs 5 & 6)
The flow water temperature from the boiler must reach
60°C (gas firing) or 55°C (oil firing) within 10 minutes of
the boiler being brought into operation. Thereafter, water
circulation should be maintained through the boiler such
that the boiler flow water temperature is always above
60°C (gas firing) or 55°C (oil firing). A pump overrun
facility is necessary to ensure that water circulation is
maintained for at least three minutes after the boiler is
switched off. It is also important that a minimum flow be
maintained through the boiler at all times - see Technical
Water treatment
Whenever a new boiler is connected to an existing system,
the pipework must be thoroughly cleaned and flushed.
Carnot recommend that a permanent means of filtration be
fitted into the return pipework, such as a sludge trap,
hydrocyclone or full flow duplex filters. The boiler
guarantee will be invalid if waterways are blocked by
debris or carbonate deposits. Long term water treatment is
essential to the economic operation and life of both new
and refurbished heating systems.
For full information on cleaning, flushing and protecting hot
water systems, refer to BSRIA Application Guide
AG 1/2001.
T
Fig 5 Multiple boilers with individual pumps
T
Fig 6 Alternative arrangement for boiler protection with a primary
loop
T
EDS822/2 page10
Boiler control panel
Control panel 21057 (see fig 7) provides either 1-stage burner control for on/off, modulating or LFS operation or 2-stage
burner control for high/low operation via a dual-thermostat with a fixed differential of 6oC. There is an overheat limit
thermostat and a switch for control of a circulating pump via a relay (not supplied). If this pump control is used, there is
a minimum temperature thermostat within the module that will hold back the pump until the boiler reaches 55oC.
Fig 7 Boiler control panel 21057
Control panel 21057 standard components
Illuminated on/off switch
4A fuse
Overheat limit thermostat and manual reset
Boiler on/off switch
S1
PH
1
F1 (max 4A)
230V - 50Hz
c
2
4
L1
2
N
3
22
T
Tr1
T
Tst
5
6
N T1
1st stage burner plug
Circulating pump on/off switch (relay required)
Control thermostat (range 60oC to 90oC)
Thermometer
24
21
11
EC1
12
S2
L1
7
8
H1 H2
9
10
T
Tr2
12
14
11
13
15
14
16
S3
c
Tr3
T
2
1
17
18
19
22
24
23
P
T7
T6
T2
S3
B4
B5
2nd stage burner plug
T8
20
21
Fig 8 wiring schematic
Key to fig 8 wiring schematic
EC1 External volt-free control (eg timeclock)
H1 External stage 1 hours run counter
H2 External stage 2 hours run counter
L1 External remote lock-out lamp
P External circulating pump
S1 Panel on/off switch
S2 Burner on/off switch
S3 Circulating pump on/off switch
Tst Boiler overheat thermostat (100oC)
Tr1 Stage 1 thermostat (60oC to 90oC)
Tr2 Stage 2 thermostat (54oC to 84oC)
Tr3 Minimum temperature thermostat (50oC)
EDS822/2 page11
Boiler control panel with volt-free indicators
Control panel 21057 is optionally available with volt-free indicators for ;
· Boiler run / total hours run
· Burner lock-out
· Boiler high-temperature lock-out
S1
1
PH
230V - 50Hz
F1 (max 4A)
c
2
T
Tst
5
4
L1
1st stage burner plug
22
T
Tr1
6
N T1
24
21
11
EC1
12
S2
L1
7
8
T2
S3
H1 H2
9
10
B4
12
14
T
11
Tr2
T6
15
14
T7
13
B5
2nd stage burner plug
T8
S3
c
Tr3
T
2
1
17
18
16
19
22
24
23
P
20
21
2
N
3
Volt-free indication
boiler overheat (nc)
Volt-free indication
burner lockout (no)
Volt-free indication
total hours run (nc)
Fig 9 wiring schematic with optional volt-free indicators
2 1 2
1
VF2 VF3
by installer
External wiring
VF1
2
1
Optional volt-free relay module
T4
T9
T10
T23 (N)
à
à
à
(factory fitted)
à
Internal connections
This publication is issued subject to alteration or withdrawal without notice. The illustrations and specifications are not binding in
detail. All offers and sales are subject to the Company's current terms and conditions of sale, a copy of which is available on request.
5 Burgesshall Drive
Maidstone
Kent ME17 1SH
Carnot Consult Ltd
t : 01622862746
e : info@carnotconsult.com
w : carnotconsult.com
January 2016
EDS 822/2
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