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12.0

SERVICING AND MAINTENANCE

12.2

COMBUSTION CHECKS

COMBUSTION CHECKS AT MAXIMUM RATE

9. Set the boiler to Maximum gas rate.

10. Check the Carbon Monoxide (CO) and Carbon Dioxide (CO

2

)

readings are within the range quoted in the tables opposite

(Table 2).

11. If the combustion value(s) is outside the values specified

in Tables 1 and 2 and the integrity of the full flue system and

combustion circuit seals, the inlet gas pressure and gas rate

have been verified, it is possible to make an adjustment to the

combustion settings by adjustment of the air/gas ratio valve.

See Section 12.3 Adjustment of the Gas Valve.

30

© Dimplex Boilers 2008

12.3

ADJUSTMENT OF THE GAS/AIR RATIO VALVE

COMBUSTION SETTING ADJUSTMENT

1. It is only possible to adjust the valve at Maximum rate. No

adjustment at Minimum rate is allowed.

2. If the maximum rate setting is adjusted, then the

combustion values must be checked at minimum rate.

NOTE: DO NOT ATTEMPT TO ADJUST THE GAS/AIR RATIO

VALVE UNLESS;

• The person carrying out the measurement has been 

assessed as competent in the use of a flue gas analyser 

and the interpretation of the results.

• The flue gas analyser used, meets the requirements of 

BS7927 or BS-EN50379-3.

• The flue gas analyser is calibrated in accordance with the

manufacturers requirements.

3. At Maximum Gas Rate; put the appliance into Service Mode

at Maximum Gas Rate (see Section 11.2).

4. Wait 5 minutes to allow the boiler to stabilise.

5. If the Carbon Dioxide (CO

2

) level is outside the required

values given in Section 12.2 (Table 2) then adjust the throttle

screw (Fig. 48) until the CO

2

is at the correct setting level. See

Table 4. Clockwise to decrease CO

2

, anti-clockwise to increase

CO

2

.

NOTE: Only turn the throttle in small steps of n

no more than

1/8

th

of a turn and wait 1 minute after each adjustment for

the combustion reading to stabilise.

IMPORTANT: After any adjustment of the gas valve, it is

essential to check the combustion levels at minimum gas

rate (Table 1). If the Carbon Monoxide or Carbon Dioxide

levels are outside the range quoted, call Dimplex Boilers Ltd

Technical Helpline on 0844 3711121. If in doubt ASK!

Table 4

Fig. 48

NOTE:

Factory set - warranty

void if adjusted

Throttle Adjuster Screw

Gas Valve

Inlet Test Point

Carbon Dioxide (CO2) acceptable setting level at Maximum 

Gas Rate after 5 minutes operation

Natural Gas %

Boiler Model

Combi 24

9.0

10.7

Combi 30

9.3

10.9

Combi 38

9.1

10.7

LPG (Propane) %

8.0

FLUE OPTIONS

8.5

Kit C Horizontal Anti-Plume Flue Kit
(C13) - Part No. 956084

If the standard horizontal terminal is likely to cause nuisance to

a neighbour or buildings, because of excess pluming, then this

particular flue kit raises the flue gas outlet point to a higher

elevation with the minimum amount of changes. The flue gas

duct is teed-off from the concentric part and covered by an

80mm outer tube to protect the flue duct from freezing. The

air in-take remains at the lower level (see Fig. 24).

If choosing this option then the external flue duct length

should be taken into account when calculating equivalent flue

length.

For installation details refer to the flue kit instructions.

Dimensions from vertical terminals to opening windows should

be in line with Fig. 19.

(For use with Standard horizontal telescopic flue kit - Part no.

956120 - only).

This kit is provided to assist in fitting a condensing boiler with

reduced clearances when fitted in good practice according to

the Guide to Condensing Boiler Installation published by

DEFRA/HMSO.

This kit allows the boiler flue outlet to be directed to the left

or to the right only.

Suitable for installations if the appliance cannot be repositioned

and where other horizontal flue options may cause some

nuisance to neighbours or buildings. The flue kit contains some

additional 45° elbows and extension ducts as well as a special

wall bracket to pass the guttering (see Fig. 26). The concentric

flue will be routed vertically alongside the outside wall to

above the roofline. Special seals are required to prevent

rainwater penetrating the pipe joints.

For installation details refer to the flue kit instructions.

© Dimplex Boilers 2008

19

8.6

Plume Diverter Terminal Kit
Part No. 956103

8.7

Kit D External Vertical Flue
(C33) - Part no. 956085

93 flanged elbow (concentric)
with sampling point

Raised external flue outlet kit -
Part no. 956084

Kit C

Raised Ø60mm flue
outlet duct with
Ø80mm  anti-freeze
pipe.
Max height of raised
flue from top of boiler
to centre of outlet 8.5m
Min height 1m.

Standard horizontal flue
adaptor has an already
built-in fall in the flue to
allow the condensate to
drain away.

93 flanged elbow (concentric)
with sampling point

Max. lengths (from top of
boiler to AIR COWL 8m
Min. length 1m.

Kit D

Ø60/100mm concentric
air/flue pipe -
Part no. 956093
(1m extension)
and
Part no, 956092
(0.5m extension)

For outside installations
the pipe joints have to
be covered with special
“lip-seal” to prevent
rain ingress.

Ensure all horizontally fitted
pipes are routed with a 
2.5-3° fall towards the boiler.

External vertical flue kit - Part no. 956085

Roof terminal
with rain cover.

Roof terminal
with rain cover
and pitched roof
flashing kit.

b

a

8.4

Offset Vertical Flue Terminal
(C33) - HBL Part 956081

‘a’ measured from boiler flue outlet centre line to the centre

line of the extension elbow.

‘b’ measured from the top of the boiler to the underside of the

air cowl.

Maximum allowable length of a + b = 8900mm

Fig. 23

Fig. 24

Fig. 25

Fig. 26

48pp MANUAL SPREADS  19/10/10  08:36  Page 19

Summary of Contents for Combi 24

Page 1: ...ES AND SERVICE HELPLINE 0844 371 1111 Glen Dimplex Boilers is continually improving its products and therefore reserve the right to change product specifications without prior notice Errors omissions excepted Glen Dimplex Boilers Stoney Lane Prescot Merseyside L35 2XW For all telephone enquiries call 0844 371 2222 website www glendimplexboilers com Part of the Glen Dimplex Group 48pp MANUAL SPREAD...

Page 2: ...stem fully pumped Yes No Type of control system Y Plan S Plan Other 18 0 WARRANTY TERMS CONDITIONS 18 1 DIMPLEX 5YR WARRANTY 1 Registration must be completed within 30 days of installation Failure to return within 30 days will invalidate your warranty Registration if effected by returning the enclosed registration card to the commercial center of Dimplex at 5 Spartan Close Tachbrook Park Leamingto...

Page 3: ...er Comments Signature SERVICE 6 Date Engineer Name Company Name Telephone Number Comments Signature SERVICE 7 Date Engineer Name Company Name Telephone Number Comments Signature SERVICE 8 Date Engineer Name Company Name Telephone Number Comments Signature SERVICE 9 Date Engineer Name Company Name Telephone Number Comments Signature SERVICE 10 Date Engineer Name Company Name Telephone Number Commen...

Page 4: ...HECKLIST l l A installations in England and Wales must be notified to Local Authority Building Control LABC either directly or through a Competent Persons Scheme A Building Regulations Compliance Certificate will then be issued to the customer Heating and Hotwater Industry Council HHIC www centralheating co uk ALL SYSTEMS PRIMARY SETTINGS indirect heating only Is the primary circuit a sealed or open...

Page 5: ...inhibitor see section 6 2 Codes of Practice refer to the most recent version In GB the following Codes of Practice apply Standard Scope BS 7967 Carbon monoxide in dwellings and the combustion performance of gas fired appliances BS 7967 2 Guide for using electronic portable combustion gas analysers in the measurement of carbon monoxide and the determination of combustion performance BS 7967 3 Guide...

Page 6: ...the load as close to your body as possible 4 Asses the risks associated with handling and lifting according to the conditions on site If in doubt seek advice before proceeding Health and Safety is the responsibility of everyone 17 0 BENCHMARK Dimplex Boilers 2008 43 GAS BOILER SYSTEM COMMISSIONING CHECKLIST CONTROLS Tick the appropriate boxes Time and Temperature Control to Heating Room Thermostat...

Page 7: ...t when fixed BCC s only fitted to replacement PCB s 36 BCC Error No flame Damaged BCC Replace BCC Auto Re start when fixed BCC s only fitted to replacement PCB s 37 BCC Error No flame Different BCC BCC and PCB software incompatible replace BCC Auto Re start when fixed BCC s only fitted to replacement PCB s 38 BCC Error No flame Different BCC Reset the appliance in accordance with BCC fitting instr...

Page 8: ...w Primary Return CH flow Thermistor CH return Thermistor Plate Heat Exchanger Condensate Trap Pressure Gauge Flow Turbine DHW Cold Inlet CH Return 3 BAR Pressure Relief Valve DHW Hot Outlet Pump Hydroblock Automatic Air Vent CH Flow Flue Products DHW Mode Manual Bleed Valve Flow Rate Restrictor Flow Rate Restrictor Fig 2 Fig 3 15 0 SPARE PARTS 15 1 SHORT PARTS LIST Dimplex Boilers 2008 41 Key GC N...

Page 9: ... 1 0 Min Mains Water Inlet Pressure for Operation Bar 0 3 0 3 0 3 Max Mains Water Inlet Pressure Bar 10 10 10 Min Domestic Hot Water Flow Rate for Operation Ltr min 2 0 2 0 2 5 Min Central Heating System Pressure Bar 0 5 0 5 0 5 Max Central Heating System Pressure Bar 2 5 2 5 2 5 Max Domestic Hot Water Temperature C 60 60 60 Min Domestic Hot Water Temperature C 40 40 40 Max Central Heating Flow Te...

Page 10: ...Always double check the label on the BCC card to ensure it is the correct BCC for the boiler model to which it is being fitted Never fit an incorrect BCC as this is extremely dangerous and could result in serious injury or death 9 Reassemble in reverse order ensuring that the control knob are reset to their previous positions Dimplex Boilers 2008 39 13 19 BCC 1 Ensure supply voltage is fully isola...

Page 11: ...and the IRNs Dimplex Boilers 2008 11 6 3 SYSTEM CONTROL 1 The boiler is fitted with an integral mechanical timer 2 It is recommended that external controls e g room thermostat are fitted to further improve the operating efficiency of the boiler and system 6 2 CENTRAL HEATING CIRCUIT 1 The appliance is suitable for fully pumped SEALED SYSTEMS ONLY Treatment of Water Circulating Systems Failure to f...

Page 12: ...20 25 6 00 5 00 4 00 3 00 2 00 1 00 0 00 Dimplex Combi Fig 8 Fig 7 Expansion Vessel Pressure Relief Valve Vessel charge and initial system pressure Total water content of system using 8 litres capacity expansion vessel supplied with appliance For systems having a larger capacity multiply the total system capacity in litres by this factor to obtain the total minimum expansion vessel capacity requir...

Page 13: ...se jumpered stopcock water meter water treatment device then an expansion vessel must be fitted e g Zilmet 160ml R1 2 15bar A single check valve must be fitted as shown in Fig 10 to prevent backflow to the supply pipe and to ensure the efficient operation of the expansion vessel which is required to accommodate the thermal expansion of the water If the hot water expansion is not provided for then ...

Page 14: ...vertical area is required for the installation of the boiler 2 These dimensions include the necessary clearance around the boiler for case removal spanner access and air movement Additional clearances may be required for the passage of pipes around local obstructions such as joists running parallel to the front face of the boiler Zone 2 Zone 2 Zone 1 Zone 0 Zone 3 Zone 3 Window Recess Zone 2 Windo...

Page 15: ... is used Flue kit B23 classification and the boiler is fitted in a compartment then high and low level ventilation is required BS 5440 2 2000 gives guidance on compartmental ventilation 2 When the boiler is installed in a cupboard or compartment and either flue kit A B C D or F Classification C13 C33 C53 is used then no compartmental ventilation is required Dimplex Boilers 2008 15 7 4 GAS SUPPLY 1...

Page 16: ...inage it may be necessary to install a condensate pump to carry condensate up to ground drain level Such products are available from most plumbing merchants For help with selecting a condensate pump contact Dimplex Boilers Tel 0844 3711121 WARNING There must be no air breaks in the condensate pipework or drainage system 16 Dimplex Boilers 2008 50mm per metre of pipe run 2 5 Minimum fall 450mm min ...

Page 17: ...ns O to S in the chart below is allowable per installation Under car ports we recommend the use of the plume displacement kit The terminal position must ensure the safe and nuisance free dispersal of combustion products Dimplex Boilers 2008 17 NOTE The minimum distance from a flue terminal to a boundary line is 300mm If fitting a plume diverter kit the air inlet should be a minimum of 100mm from a...

Page 18: ...her buildings 60 100 flue accessories 0 5m flue extension duct 956092 1m flue extension duct 956093 93 flue extension elbow 956091 45 flue extension elbow 2x 956090 Vertical flue turret 956087 Ø60 100mm concentric standard horizontal wall terminal Max length 10 000mm Min length 250mm Standard telescopic horizontal flue kit Part no 956120 Horizontal terminal has a built in fall in the flue to allow...

Page 19: ...s particular flue kit raises the flue gas outlet point to a higher elevation with the minimum amount of changes The flue gas duct is teed off from the concentric part and covered by an 80mm outer tube to protect the flue duct from freezing The air in take remains at the lower level see Fig 24 If choosing this option then the external flue duct length should be taken into account when calculating e...

Page 20: ...e rooms within the same dwelling the flue pipe must be routed through vented ducts The flue resistance for the following accessories has to be considered Ø80mm flue extension 90 elbow 45 elbow Split pipe vertical flue outlet kit Part no 956080 Kit F Fig 27 Fig 28 12 0 SERVICING AND MAINTENANCE 12 1 ROUTINE SERVICING AND ALL MAINTENANCE THAT INVOLVES THE EXCHANGE OF PART OF THE COMBUSTION CIRCUIT 1...

Page 21: ...0m 956111 20m Flexi tube 30m 956112 30m Straight duct 80 included in kit N A N A Chimney terminal included in kit N A N A Note Equivalent length information only required for coaxial flue parts The corrugated Flexi tube flue parts are fixed and all parts are required for every application Dimplex Boilers 2008 21 8 11 Additional Concentric Flue Kit Accessories The following additional concentric ki...

Page 22: ...watch NOTE This boiler is supplied factory set for operation on natural gas No further adjustments of the air gas ratio valve or measurement of the combustion performance are necessary at the time of installation and commissioning This is provided the appliance has been installed according to these instructions and the inlet gas pressure is within our specification Dimplex Boilers 2008 27 NOTE If ...

Page 23: ...16 5 17 6 18 7 19 8 20 9 21 10 22 11 23 12 24 0 1 0 1 2 bar 3 4 9 0 INSTALLATION 9 2 FITTING THE BOILER 1 Remove the sealing caps from the boiler connections NOTE A small amount of water may drain from the boiler once the caps are removed 2 Check the sealing washers are located correctly in the taps on the wall jig 3 Lift the boiler as indicated by the shaded areas The boiler should be lifted by T...

Page 24: ...ure that the terminal is the correct way around 3 Loosely fit the internal wall sealing ring over the inside end of the flue 4 Assemble the flue system extension ducts as necessary referring to the flue kit instructions and fit to the elbow 5 Fit the flue terminal to the flue system ensuring that the duct joints are not disturbed and that the external sealing ring is seated against the outside wal...

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