Grant Combi 90 V3, Combi Max, Condensing Combi 26, Condensing Combi 36 User, Installation And Servicing Instructions

Part No. IRL 004 Rev: 0 Jan 07

USER, INSTALLATION

and

SERVICING INSTRUCTIONS

Combi 90 V3

Combi Max

Condensing Combi 26 and Condensing Combi 36

For use with Kerosene or Gas Oil (Condensing Combi Kerosene only)

After installing the boiler leave these instructions with the User

This appliance is deemed a controlled service and specific regional statutory

requirements may be applicable

Section Subject Page

1 Combi V3 and Combi Max user instructions . . . . . . . . . . . . . . . . . . . . . . 3

2 Condensing Combi user instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Combi V3, Combi Max and Condensing Combi User instructions . . . . . 5

4 Technical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 General boiler information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6 Boiler installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

7 Fill and vent the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

8 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

9 Boiler handover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

10 Boiler servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

11 Boiler components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

12 Wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

13 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

14 Burner spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

15 Health and safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

16 EC declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

It is recommended that the boiler should be regularly serviced, at least once a year, and the details entered in the Boiler Handbook by the Service Engineer.

Date: ................................................................................

Commissioning engineer: ................................................................................ Tel. No: ..................................................

Boiler model/output: ........................................................Btu/h Fuel type: Kerosene or Gas oil

Nozzle size: ................................................................ Pump pressure: .................................... Air setting: ..........................

Flue gas % CO2 .......................................................... Net flue gas temp: ................................ Smoke No: ..........................

Combi V3, Combi Max and Condensing Combi Models

LIST OF CONTENTS

SERVICE LOG

COMMISSIONING REPORT

Your Grant Combi boiler is fully automatic when the Boiler On/Off switch is set to ON, and will provide domestic hot water at mains pressure on demand and central heating when the b

oiler and heating system controls call for it.

Your boiler maybe fitted with a mechanical 24-hour timer. Alternatively, your installer may have fitted a separate timer., in a convenient position remote from the boiler.

Whichever type of timer is connected to your boiler. it will allow you to set the operating times of the central heating. Domestic hot water is available continuously, provided the boiler is switched on, irrespective of the settings on the timer.

To access the controls, pull off the front door from the boiler.

1 Heating switch - When set to TIMED the boiler will only

provide central heating during the 'on' periods set on the timer. When set to the HOT WATER ONLY position the boiler will not provide central heating. When set to the CONSTANT position the boiler provides central heating continuously, overriding all of the timer settings.

2 Boiler On/Off - This switches the boiler on and off.

3 Boiler thermostat - This control allows adjustment of the

temperature of the water leaving the boiler to heat either the radiators or the hot water, via the hot water heat exchanger.

The boiler thermostat has an operating range of 75˚C to 85˚C. For optimum hot water operation, ensure this is

set to maximum.

When setting the times for the 'on' periods it is useful to remember that it might take up to an hour for the house to become warm, especially in colder weather. Also the effect of t

he central heating will remain for a time when the central heating is turned off. Do not forget that if you require central heating during an 'off period, simply set the Heating switch to CONSTANT, remember the switch must be reset to TIMED at a later time for the timer to return to your pre-set periods.

The boiler will operate on either Class C2 Kerosene or Class D Gas Oil to BS 2869:1998. Your Installer will have informed you of the type of fuel your boiler has been set to use and he will have marked this on the boiler data label. You should always quote the type of fuel you require when ordering from your supplier.

Do not wait until the fuel runs out before you order some more. Sludge in the bottom of the tank may be drawn into the fuel lines. If it is possible, switch off the boiler when the new supply is delivered and leave the fuel to settle for an hour before restarting the boiler.

1 - COMBI V3, COMBI MAX & CONDENSING USER INSTRUCTIONS

Combi V3, Combi Max and Condensing Combi Models

1.1

bout your Combi V3 or Combi Max Boiler

1.2

Boiler controls (see Fig. A)

1.4

About your fuel

1.3

Useful tips

Note: The timer (if fitted) will still operate with this switch set to OFF, providing the electricity supply to the boiler is still switched on, but the boiler will not operate to provide domestic hot water.

To ensure that the hot water performance is not reduced first thing in the morning, or in the evening if the heating is off through the day, set the heating timer to switch the heating on at least 30 minutes before hot water will normally be required in the morning (or evening).

Note: Low level balanced flue installations (flue terminal

through the wall) must only be used with Kerosene, unless the flue terminal is higher than 2.0 m above outside ground level.

our Condensing Combi boiler is fully automatic once switched on, and will provide domestic hot water at mains pressure on demand and central heating when the boiler and heating system controls call for it. The boiler On/Off switch incorporates a '

mains on' neon, see Fig. B, which lights when the boiler is switched on, but does not necessarily indicate the burner is firing. Your boiler maybe fitted with a mechanical 24-hour timer. Alternatively, your installer may have fitted a separate timer, in a convenient position remote from the boiler. Whichever type of timer is connected to your boiler, it will allow you to set the operating times of the central heating. Domestic hot water is available continuously, provided the boiler is switched on, irrespective of the settings on the timer.

To access the controls, pull off the front door from the boiler.

1 Store switch - Allows the primary store to be manually

switched off if hot water is not required. With the switch set to OFF, the burner will not fire to maintain the water temperature in the store and the hot water (store) pump will not operate.

2 Heating switch - When set to TIMED, the boiler will only

provide central heating during the 'on' periods set on the timer. When set to OFF, the boiler will not provide central heating. When set to CONSTANT, the boiler provides central heating continuously overriding all of the timer settings.

Note: Provided the Store switch is set to ON, the boiler will provide hot water on demand irrespective of the setting on the Heating switch and will override the heating as required to maintain the temperature of the store.

3 Boiler On/Off - This switches the boiler on and off.

Note: The internal timer (if fitted) will still operate with this

switch set to OFF. provided that the electricity supply to the boiler is still switched on, but the boiler will not operate to provide domestic hot water.

4 Boiler heating thermostat -Controls the temperature of the

water leaving the boiler to the central heating system. Operation of this control does not affect the temperature of the hot water flowing to the taps.

ou should always quote the type of fuel you require when

ordering from your supplier.

2 - CONDENSING COMBI USER INSTRUCTIONS

Combi V3, Combi Max and Condensing Combi Models

2.1

bout your Condensing Combi boiler

2.3

About your fuel

2.2

Boiler controls (see Fig. B)

IMPORTANT: The boiler will not produce hot water when the Store switch is set to OFF.

Grant Condensing Combi boilers only operate on Class C2 Kerosene to BS 2869:1998.

3 - COMBI V3, COMBI MAX & CONDENSING USER INSTRUCTIONS

Combi V3, Combi Max and Condensing Combi Models

Fig. A – Combi V3 and Combi Max Boiler Controls

Fig. B – Boiler controls (Condensing Combi 36 shown)

1 Ensure that - There is sufficient fuel in the supply tank and

all fuel supply valves are open, the water supply is on, the electricity supply to the boiler is off, the Boiler On/Off switch is set to OFF, the Heating switch is set to TIMED, the white pointer on the pressure gauge is not below the red pointer, the room thermostat (if fitted) is at the desired setting and the timer is correctly set.

2 Switch on the electricity supply to the boiler. 3 Set the On/Off switch to ON. 4 The boiler will light automatically to heat the water stored

in the boiler. If the timer is set to an 'on' period the boiler will continue to

run to provide central heating. If a hot tap is opened the boiler will supply hot water.

For short periods: - Set the On/Off switch to OFF. To restart, simply set the switch to ON.

For long periods: - Set the On/Off switch to OFF and switch off the electricity supply to the boiler. If required, the fuel supply valve may be closed and the water and electricity supplies turned off at the mains. To restart, refer to the full lighting instructions above.

1 Check that the boiler On/Off switch is set to ON.

2 Check that the timer is working and is in an 'on' period.

3 Check that all thermostats are set to the desired setting and

are calling for heat.

4 Check if the burner 'Lock-out' reset button is lit. If it is, press

it to start the burner. If the burner fails to light and goes to 'Lock-out' again, check that you have sufficient fuel in the storage tank and that the fuel supply valve is open.

5 Ensure that a fuse has not blown or that the electricity

supply has not failed.

6 Check to see if the overheat thermostat has operated (see

note 4 in Section 3.6).

7 Check that the white pointer on the pressure gauge is not

below the red pointer.

8 If the heating system water pressure falls below 0.2 bar the

boiler low pressure cut-out switch will activate and an amber neon on the control panel (see Fig. A or B) will light. The system must be recharged to between 0.5 and 1 bar. If the heating system loses pressure on a regular basis then contact your Installer to investigate the cause.

f the burner still fails to light after carrying out these checks then a fault exists. Switch off the electricity supply to the boiler a

nd contact your Service engineer.

The boiler will supply domestic hot water whenever a hot tap is opened, providing the Boiler On/Off switch is set to ON.

Note: The Condensing Combi Store switch must also be set to 'ON' for hot water to be supplied.

The flow of water from the taps (hot or cold) depends upon the mains water pressure, and in some homes it may not be possible to use more than one tap at the same time.

The boiler operates on a sealed central heating system which will have been pressurised by your Installer. He will have set the red pointer on the pressure gauge (see Fig. A or B), to indicate the system pressure (when cold) usually between 0.5 and 1.0 bar. Do not adjust this pointer. The white pointer indicates the actual system pressure which will increase slightly when the boiler is operating. If the white pointer falls below the red pointer (when the boiler is switched off and cold), you should contact your Service Engineer to repressurise the system. If the system requires frequent repressurising, ask your Service Engineer to check the heating system for leaks.

If the heating system water pressure falls below 0.2 bar the boiler low pressure cut-out switch will activate and an amber neon on the control panel (see Fig. A or B) will light. The system must be recharged to between 0.5 and 1 bar. If the heating system loses pressure on a regular basis then contact your Installer to investigate the cause.

The boiler is fitted with an automatic air vent which removes air trapped in the boiler. Any air trapped in the radiators needs removing by venting the radiators using the vent screw at the top of the radiators. Only vent a radiator if the top is cool and the bottom is hot. Excessive venting will reduce the system pressure, so only vent when necessary and check the system pressure as mentioned above.

The boiler is fitted with a safety valve to release excess pressure from the system. If water or steam is emitted from the end of the safety valve discharge pipe, switch off the boiler and contact your Installer or Service engineer.

3 - COMBI V3, COMBI MAX & CONDENSING COMBI USER INSTRUCTIONS

Combi V3, Combi Max and Condensing Combi Models

3.1

ighting your boiler (see Fig. A or B)

3.2

Turning off your boiler (see Fig. A or B

3.4

Domestic hot water system

3.5

Sealed central heating system

3.3

Points to check if burner fails to light

Note: Your sealed system may incorporate a 'Top-Up' vessel, advice on how to use it should be obtained from your Installer.

To re-pressurise the system by adding water:

1 Only add water to the system when it is cold and the boiler

s off. Do not overfill.

2. Ensure the flexible filling loop is connected and that the shut off valve connecting it to the boiler is open and the double check valve at the front is closed.

A valve is open when the operating lever is in line with the valve, and closed when it is at right angles to it.

3 Gradually open the double check valve on the front of the

filling loop until water is heard to flow.

4 Vent each radiator in turn, starting with the lowest one in

the system, to remove air.

5 Continue to fill the system until the pressure gauge indicates

the required pressure between 0.5 and 1.0 bar. Close the fill point valve.

6 Close the valves either side of the filling loop and

disconnect the loop.

The temperature of the water leaving the boiler to the radiators can be increased by turning the boiler (heating) thermostat (see Fig. A or B) clockwise.

With the Heating switch set to TIMED, the boiler will provide central heating whenever the timer is in an 'on' period and the room thermostat (if fitted) is calling for heat.

For summer time operation, when central heating is not required, set the Heating switch (see Fig. A) to HOT WATER ONLY, or OFF for Condensing Combi (see Fig. B).

1 Boiler controls - Refer to Section 2.2 or 3.2. 2 Pressure switch - If the heating system water pressure falls

below 0.2 bar the boiler low pressure cut-out switch will activate and an amber light will illuminate. The system must be recharged to between 0.5 and 1 bar. If the heating system loses pressure on a regular basis then contact your Installer to investigate the cause.

3 Burner Lock-out reset button - If there is a burner

malfunction, a built-in safety circuit switches the burner off and the Lock-out reset button will light. Usually such malfunctions are short lived and pressing the reset button will restore normal operation.

If the burner continually goes to 'Lock-out' a fault exists or the fuel supply is low. If you have sufficient fuel, you will need to call your Service engineer.

4 Overheat thermostat - Your boiler is fitted with a safety

overheat thermostat which will automatically switch off the boiler in the case of a control malfunction causing overheating. A red neon (see Fig. A or B) will light indicating the thermostat has operated.

f your boiler goes off and you try to light it but nothing happens and the 'Lock-out' reset button on the burner is not l

it, the overheat thermostat has probably operated. The boiler will not light until the thermostat is reset. To reset, unscrew the small plastic cap (see Fig. A or B), press the button then replace the cap.

ote: You may have to wait for the boiler to cool down

before the button will reset. If this condition continually repeats, contact your Service engineer.

5 Ventilation - Always ensure that the boiler has adequate

ventilation. Any ventilation openings provided by the Installer must not be obstructed. Periodically check that they are clear. Do not attempt to 'box in ' the boiler or build a compartment around it before consulting your Installer. Do not place any combustible material around or on the boiler or flue pipe.

6 Flue terminal - The flue terminal on the outside wall must

not be obstructed or damaged. In severe conditions check that the terminal does not

become blocked by snow.

7 Frost protection - Your Installer may have fitted a frost

thermostat. If not, and you are likely to be away for a short time, leave the boiler on with the boiler thermostat set at a low setting. For Ionger periods the boiler and system should be drained. Contact your Service engineer for draining and filling the system.

8 Cleaning and servicing - Lightly wipe over the case with

a damp cloth and a little detergent. Do not use abrasive pads or cleaners. You should have your boiler serviced at least once a year to ensure safe and efficient operation. Contact your Service engineer for further details.

9 Failure of electricity supply - If the electricity supply fails,

the boiler will not operate. It should relight automatically when the supply is restored. Note: The time on the internal 7-day or 24-hour timer may need to be reset after a power failure.

The boiler requires a 230/240 V - 50 Hz supply. It must be protected by a 5 Amp fuse.

The section of any worktop (if fitted) above the boiler must be removable to provide access for servicing the Condensing Combi 36.

The Combi 90 V3, Combi Max and Condensing Combi 26 boilers can be serviced from the front, but it is preferable for any worktop above the boiler to be removable to provide the best access for servicing.

3 - COMBI V3, COMBI MAX & CONDENSING COMBI USER INSTRUCTIONS

Combi V3, Combi Max and Condensing Combi Models

3.6

General notes and care of your system

3.7

Electricity Supply

3.8

Important

The expansion vessel air charge must be checked a

nnually. Failure to maintain an adequate air charge in

the vessel may invalidate the warranty.

Warning: This appliance must be earthed.

Model Combi 90 V3 Combi Max

Boiler water content litre 40 40

gal 8.8 8.8

* Weight (dry) kg 158 159

lb 348 350

Max. heat input (Kerosene) kW 27.6 36.8

Btu/h 94 200 125 500

Connections: Heating flow and return 22 mm copper pipe

Cold water mains inlet 15 mm copper pipe

Domestic hot water outlet 15 mm copper pipe **

Pressure relief valve discharge 15 mm copper pipe

Flue size (conventional) 100 mm (4 in) diameter

Waterside resistance Flow/Return temp. diff. of 10˚C 26.5 mbar

Waterside resistance Flow/Return temp. diff. of 20˚C 9.5 mbar

Boiler thermostat range 75˚ to 85˚C

Limit (safety) thermostat switch off temp. 111˚C ± 3˚C

Maximum heating system pressure (cold) 1.0 bar

Minimum heating system pressure (cold) 0.5 bar

Pressure relief valve 2.5 bar

Expansion vessel 12 litres (pre-charged at 1.0 bar)

Maximum heating system volume*** 128 litres

Maximum operating pressure 2.5 bar

Minimum domestic hot water flow rate 3.0 litres/min (0.66 gal/min)

Maximum domestic hot water temperature 65˚C (factory set)

Maximum mains water inlet pressure 8.0 bar

Minimum recommended mains water inlet pressure 2.5 bar

Max. hearth temperature Less than 50˚C

Electricity supply 230/240 V - 50 Hz Fused at 5 Amp

Motor power 90 W max.

Starting current 2.60 Amp

Running current 0.85 Amp

Oil connection 1/4" BSP Male (on end of flexible fuel line)

Conventional flue Minimum flue draught - 8.7 N/m

(0.035 in wg)

Maximum flue draught - 37 N/m

(0.15 in wg)

* Weight includes burner but excludes flue

** 22 mm hot water pipe can be connected to the Combi Max if required.

*** Based on expansion vessel charge and initial cold system pressure of 0.5 bar.

4 – BOILER TECHNICAL INFORMATION

Combi V3, Combi Max and Condensing Combi Models

oiler technical data – Combi V3 and Combi Max boilers

Model Condensing Combi 26 Condensing Combi 36

Boiler water content litre 48.5 53.5

(including 32.5 litre primary store) gal 10.7 11.8

* Weight (dry) kg 188 218

lb 415 481

Max. heat input (Kerosene) kW 26 36

Btu/h 88 700 123 000

Connections: Heating flow and return 22 mm copper pipe 28 mm copper pipe

Cold water mains inlet 15 mm copper pipe 22 mm copper pipe

Domestic hot water outlet 15 mm copper pipe 22 mm copper pipe

Pressure relief valve discharge 15 mm copper pipe

Condensate connection 22 mm plastic pipe

Flue size (conventional) 100 mm (4 in) diameter

Waterside resistance How/Return temp. diff. of 1 0˚C 28.5 mbar 26.0 mbar

Waterside resistance Flow/Retum temp. diff. of 20˚C 10.0 mbar 9.5 mbar

Boiler thermostat range 65 to 80˚C

Limit (safety) thermostat switch off temp. 111˚ C +0 -3˚C

Maximum heating system pressure (cold) 1.0 bar

Minimum heating system pressure (cold) 0.5 bar

Pressure relief valve 2.5 bar

Expansion vessel (pre-charged at 1 bar) 12 litres 14 litres

Maximum heating system volume** 128 litres 148 litres

Maximum operating pressure 2.5 bar

Minimum domestic hot water flow rate 3.0 litres/min (0.66 gal/min)

Maximum domestic hot water temperature 65˚C (factory set)

Maximum mains water inlet pressure 8.0 bar

Minimum recommended mains water inlet pressure 2.5 bar

Max. hearth temperature Less than 50˚C

Electricity supply 230/240 V - 50 Hz Fused at 5 Amp

Motor power 90 W max.

Starting current 2.60 Amp

Running current 0.85 Amp

Oil connection 1/4" BSP Male (on end of flexible fuel line)

Conventional flue Minimum flue draught - 8.7 N/m

(0.035 in wg)

Maximum flue draught - 37 N/m

(0. 15 in wg)

* Weight includes burner but excludes flue

** Based on expansion vessel charge and initial cold system pressure of 0.5 bar

4 – BOILER TECHNICAL INFORMATION

Combi V3, Combi Max and Condensing Combi Models

4.2

oiler technical data – Condensing Combi boilers

Note: All boilers are despatched for use with kerosene.

Combi 90 V3 (Riello RDB1 burner)

eat Output Net Heat input Net eff. ** Head Nozzle 0il press. Smoke Fuel flow Net flue gas Flue gas mass CO

(kW) (Btu/h) (kW) (Btu/h) % type size (bar) No. Rate (kg/h) temp. (˚C) flow rate (kg/h) %

26.4 90 000 27.6 94 200 95.8 LD3 0.75/60˚EH 9.5 0 - 1 2.40 180 38.7 12.0

Combi Max (Riello RDB2.2 burner)

Heat Output Net Heat input Net eff. ** Head Nozzle 0il press. Smoke Fuel flow Net flue gas Flue gas mass CO

(kW) (Btu/h) (kW) (Btu/h) % type size (bar) No. Rate (kg/h) temp. (˚C) flow rate (kg/h) %

33.3 113 600 36.8 125 500 91.5 T5 1.00/80˚EH 9.0 0 - 1 3.10 190 51.5 12.0

Combi 90 V3 (Riello RDB1 burner)

Heat Output Net Heat input Net eff. ** Head Nozzle 0il press. Smoke Fuel flow Net flue gas Flue gas mass CO

(kW) (Btu/h) (kW) (Btu/h) % type size (bar) No. Rate (kg/h) temp. (˚C) flow rate (kg/h) %

26.4 90 000 27.9 95 250 94.6 LD3 0.60/60˚S 12.0 0 - 1 1.97 200 38.7 12.0

Combi Max (Riello RDB2.2 burner)

Heat Output Net Heat input Net eff. ** Head Nozzle 0il press. Smoke Fuel flow Net flue gas Flue gas mass CO

(kW) (Btu/h) (kW) (Btu/h) % type size (bar) No. Rate (kg/h) temp. (˚C) flow rate (kg/h) %

32.9 112 463 36.0 122 910 91.5 T5 0.75/80˚S 11.0 0 - 1 3.02 200 51.5 12.0

Notes:

1 The data given above is approximate only. The Kerosene table is based on the boiler being used with a low level balanced flue.

2 The above settings may have to be adjusted on site for the correct operation of the burner.

3 Gas Oil is not suitable for use with a low level balanced flue unless the flue terminal is higher than 2.0 m above outside ground

level.

4 The installer must amend the boiler data label if the type of fuel and nozzle used are changed.

5 Net flue gas temperatures given are ± 10%.

6 ** Net thermal efficiency (notified body).

7 Flue gas temperatures taken at combustion door test point will be approximately 25˚C higher for the Combi 90 V3 and

Combi Max.

Note: Burners are supplied factory set at the outputs shown.

When commissioning, or when the type of fuel is changed, the air damper must be adjusted to obtain the correct CO

level and the

Installer must amend the data label.

4 – BOILER TECHNICAL INFORMATION

Combi V3, Combi Max and Condensing Combi Models

4.3

ombi V3 and Combi Max oil boilers using class C2 kerosene

4.4

Combi V3 and Combi Max oil boilers using class D gas oil

4.5

Approximate air damper settings

ote: Condensing Combi boilers are only for use with

kerosene.

Model Burner Heat Output Net Nozzle Oil Smoke Burner Fuel flow Flue gas C0

type eff * press. No. head rate temp.

(kW) (Btu/h) % (bar) (kg/h) (˚C) (%)

26 Riello RDB1 26.0 88 700 101.0 0.75/80˚EH 8.0 0 - 1 T2 2.16 75 - 80 12.0

36 Riello RDB2.2 36.0 123 000 101.5 1.00/80˚EH 9.1 0 - 1 T5 3.01 78 12.0

Notes:

1 The data given above is approximate only and is based on the boiler being used with a low level balanced flue.

2 The above settings may have to be adjusted on site for the correct operation of the burner.

3 Gas Oil is not suitable for use with a Grant Condensing Combi boiler.

4 * Net thermal efficiency.

5 The net flue gas temperatures given above are ± 10%.

6 When commissioning the air damper must be adjusted to obtain the correct CO

level.

7 The combustion door test point may be used for CO2and smoke readings only. Do not use this test point for temperature or

efficiency readings.

Flue gas analysis

To allow the boiler to be commissioned and serviced, the boiler is supplied with a combustion test point on the front cleaning door. When this test point is used please note the following:

1 . The test point is for CO2and smoke readings only.

2. The boiler efficiency and temperature must be taken from the flue test point on high level, vertical and conventional flue adaptors.

3. Concentric low level flues do not contain a test point. The temperature and efficiency readings must be taken from the flue terminal.

4 – BOILER TECHNICAL INFORMATION

Combi V3, Combi Max and Condensing Combi Models

4.9

ondensing Combi oil boilers using Class C2 kerosene

4 – BOILER TECHNICAL INFORMATION

Combi V3, Combi Max and Condensing Combi Models

4.7

oiler dimensions - Combi V3 and Combi Max

Fig. 1

Note: Water connections may be from the rear, left or right hand side. If using side exit flue, it must be on the opposite side to the water connections.

Fig. 2

4.8

Water schematic of boiler - Combi V3 and Combi Max

4 – BOILER TECHNICAL INFORMATION

Combi V3, Combi Max and Condensing Combi Models

4.9

oiler dimensions - Condensing Combi

Fig. 3 - Condensing Combi 26 dimensions

Fig. 3a - Condensing Combi 36 dimensions

4 – BOILER TECHNICAL INFORMATION

Combi V3, Combi Max and Condensing Combi Models

4.9

Water schematic of boiler - Condensing Combi

Fig. 4

The Combi and Condensing Combi boilers are automatic pressure jet oil boilers designed for use with a sealed central heating system and will provide domestic hot water at mains pressure.

All boilers are supplied with the control panel and burner factory fitted.

All boilers can be connected to either a conventional flue system or a balanced flue system, as required.

The Combi V3 and Combi Max boilers are supplied ready to connect to a conventional flue. If the boiler is to be used with a balanced flue, a Balanced Flue Kit is required.

Fitting instructions for the Low level concentric, High level and Vertical balanced flue kits are supplied with the kits. Where a balanced flue system is required, the following flue kits are available from local merchant.

Refer to Section 5.8 for further details.

Yellow system… Standard low level concentric balanced flue components available:

Low level concentric balanced flue

Extensions 225 mm 450 mm and 675 mm

90˚ extension elbow

45˚ extension elbow

45˚ elbow

Green system… Standard external high level/vertical flue starter kit (room sealed) - components available:

External high level/vertical flue starter kit short (room sealed)

Extensions 150 mm, 250 mm, 450 mm 950 mm and adjustable 195 to 270 mm

45˚ elbow

High level terminal

Vertical terminal

hite system… High level concentric balanced flue kit -

components available:

Extensions 225 mm, 450 mm, 950 mm and adjustable 275 t

o 450 mm

45˚ elbow

Vertical concentric balanced flue kit

Extensions 225 mm, 450 mm, 950 mm and adjustable 275 to 450 mm

45˚ elbow

The Combi V3 and Combi Max boilers are supplied ready for use with Class C2 kerosene. If required, they can easily be adapted for use with Class D gas oil.

If the fuel to be used is Gas Oil, it will be necessary to change the burner nozzle. Refer to the Technical Information in Section

4.3. To change the nozzle, remove the burner from the boiler then remove the nozzle as described in Section 10.4. The installer must amend the boiler data label accordingly.

The Condensing Combi boilers are only suitable for use with Kerosene.

All burners are ready to connect to a single pipe system with

a loose flexible fuel line (600 mm) and 3/8" to 1/4" BSP male adaptor supplied with the boiler. If required, an additional flexible fuel line (600 mm) and 3/8" to 1/4" BSP male adaptor are available to purchase from local merchant for two-pipe oil supply system.

The temperature of the water leaving the boiler to heat the radiators is User adjustable.

To achieve the optimum hot water performance from the Combi V3 and Combi Max, the boiler thermostat should be set to maximum.

The setting of the boiler thermostat on the Condensing Combi has no effect on the hot water performance.

The control panel is fitted with an ON/OFF switch, boiler thermostat control knob and the manual reset button for the overheat thermostat. An optional timer is available which allows the User to set the operating times for central heating and hot water. Alternatively, an external timer, located remotely from the boiler in a convenient position for the user, may be connected to the boiler for this purpose.

Domestic hot water is available at all times, provided the boiler is switched on.

5 - GENERAL BOILER INFORMATION

Combi V3, Combi Max and Condensing Combi Models

5.1

oiler description

The Condensing Combi boilers are not supplied with a flue adaptor. If a conventional flue is to be used, a Grant conventional flue adaptor (Ref. CFCA1546) must be ordered.

For conventional flue applications, Grant recommends the use of the Grant 'Orange' flue system, specifically designed for the Condensing condensing boiler. Refer to Section 5.8 for further details.

Note: Only Kerosene may be used with a low level balanced flue, unless the flue terminal is higher than 2.0 m above outside ground level.

Installation of a Grant Combi boiler must be in accordance with the following recommendations:

a Local Building Regulations issued by the Department

of the Environment and any local Byelaws etc.

b Model and local Water Undertaking Byelaws.

c Applicable Control of Pollution Regulations.

d The following OFTEC requirements:-

OFS T100 Polythene oil storage tanks for

distillate fuels.

OFS T200 Fuel oil storage tanks and tank bunds

for use with distillate fuels, lubrication oils and waste oils.

Further information may be obtained from the OFTEC Technical Information Book 3 (Installation requirements for oil fired boilers and oil storage tanks).

The installation should also be in accordance with the latest edition of the following British Standard Codes of Practice:-

BS 715 Metal flue pipes, fittings, terminals and

accessories.

BS 799:5 Oil storage tanks.

BS 1181 Clay flue linings and flue terminals.

BS 4543:3 Factory made insulated chimneys for oil fired

appliances.

BS 4876 Performance requirements for oil burning

appliances.

BS 5410:1 Code of Practice for oil firing appliances.

BS 5449 Forced circulation hot water systems.

BS 7593 Code of Practice for treatment of water in

heating systems.

BS 7671 Requirements for electrical installations, lEE

Wiring Regulations.

5.3.1 Fuel storage

The tank should be positioned in accordance with the recommendations given in BS 5410:1:1997, which gives details of filling, maintenance and protection from fire.

A galvanised tank must not be used.

A plastic tank may be used and must comply with OFS T100.

Note: Plastic tanks should be adequately and uniformly supported on a smooth level surface, across their entire base area.

5.3.2 Fuel pipes

1 Fuel supply pipes should be of copper tubing with an

internal diameter of at least 8 mm. Galvanised pipe must not be used.

2 Flexible pipes must not be used outside the boiler case.

3 A remote sensing fire valve must be installed in the fuel

supply line (outside) where it enters the building. Recommendations are given in BS 5410:1:1997.

4 A metal bowl type filter with a replaceable micronic fitter

must be fitted in the fuel supply line. A shut-off valve should be fitted before the filter, to allow the filter to be serviced.

5 A flexible fuel line, adaptor and 1/ 4" BSP isolation valve

are supplied loose with the boiler for the final connection to the burner. If a two pipe system or Tiger Loop system is used, an additional flexible fuel line (600 mm) and 3/8” to 1/4" BSP male adaptor are available from local merchant.

6 The flexible fuel lines supplied should be inspected annually

when the boiler is serviced and replaced at least every two years.

5 - GENERAL BOILER INFORMATION

Combi V3, Combi Max and Condensing Combi Models

5.2

egulations to comply with

5.3

Fuel supply

Failure to install and commission appliances correctly may invalidate the boiler warranty.

IMPORTANT

Before starting any work on the boiler, or fuel supply please read the health and safety information given in Section 15 on page 61.

Some regional statutory requirements may deem this a

ppliance to be a 'controlled service'. Where this is the case, it is a legal requirement that the appliance is installed and commissioned either under the remit of building control or by a 'Competent person' such as a suitably qualified OFTEC registered technician.

.3.3 Single pipe system - (See Fig. 5)

Where the storage tank outlet is above the burner the single pipe system should be used. The height of the tank above t

he burner limits the length of pipe run from the tank to the

burner.

2 As supplied the burner is suitable for a single pipe system.

5.3.4 Two pipe system - (See Fig. 6)

1 When the storage tank outlet is below the burner, the two

pipe system should be used.The pipe runsshould be as shown in Fig. 5. The return pipe should be at the same level in the tank as the supply pipe, both being 75 to 100 mm above the base of the tank. The pipe ends should be a sufficient distance apart so as to prevent any sediment disturbed by the return entering the supply pipe.

Avoid the bottom of the tank being more than 3 m below the burner.

3 A non-return valve should be fitted in the supply pipe

ogether with the filter and fire valve. A non-return valve should be fitted in the return pipe if the top of the tank is above the burner.

5 The pump vacuum should not exceed 0.4 bar. Beyond this

limit gas is released from the oil. A vacuum gauge must be fitted to the fuel pump to check the vacuum reading.

5 - GENERAL BOILER INFORMATION

Combi V3, Combi Max and Condensing Combi Models

4 To be used with a two-pipe system, the burner must be

fitted with an additional flexible fuel line (a flexible fuel line (600 mm) and 3/8" to 1/4" BSP male adaptor are available from local merchant).

See Section 5.3.6.

For guidance on installation of top outlet fuel tanks and suction oil supply sizing, see OFTEC booklet T 11139. Available at www.oftec.org.uk

Fig. 5 - Single pipe system

Head A Maximum pipe run (m)

(m) 8mm OD pipe 10mm OD pipe

0,5 10 20

1.0 20 40

1.5 40 80

2.0 60 100

5.3.5 Tiger Loop system - (See Figs. 7 and 8)

1 When the storage tank is below the burner, an alternative to

a two pipe system can be achieved using the Tiger Loop oil deaerator. This effectively removes the air from the oil supply on a single pipe lift.

2 The Tiger Loop is connected close to the boiler as a two pipe

system (omitting the non-return valve) as shown in Fig. 7. Refer to the manufacturers instructions supplied with the Tiger Loop. The Tiger Loop must be mounted vertically.

3 To be used with a Tiger Loop system, the burner must be

fitted with an additional flexible fuel line (a flexible fuel line (600 mm) and 3/8" to 1/4" BSP male adaptor are available to purchase from local merchant.

5 - GENERAL BOILER INFORMATION

Combi V3, Combi Max and Condensing Combi Models

Fig. 6 - Two pipe system

Head A Maximum pipe run (m)

(m) 8 mm OD pipe 10 mm OD pipe

0 35 100

0.5 30 100

1.0 25 100

1.5 20 90

2,0 15 70

3.0 8 30

3.5 6 20

Note: To prevent any possibility of fuel fumes entering the building, the Tiger Loop must be fitted outside.

Fig. 7 - Tiger loop system

5.3.6 Two pipe oil supplies

See Fig. 9

1 The fuel pump is supplied for use with a single pipe fuel

supply system. For use on a two pipe system, it is necessary to fit the By-pass screw (see Fig. 9) into the tapping in the return port.

2 The By-pass screw is supplied in the boiler accessory pack.

3 Remove the plastic burner cover (two screws).

4 Remove and discard the blanking plug from the return

connection of the pump and fit the By-pass screw using an hexagonal key.

5 Connect the return oil flexible fuel line to the pump.

6 Connect the 3/8 to 1/4” BSP adaptor to the flexible fuel line.

7 Flexible fuel lines and adaptors are available to purchase

from local merchant.

8 The burner cover may be left off until the boiler is

commissioned.

5 - GENERAL BOILER INFORMATION

Combi V3, Combi Max and Condensing Combi Models

Fig. 8 - Tiger loop

Fig. 9 - RDB pump

1 Oil inlet connection 5 Pressure adjuster

2 Return connection 6 Vacuum gauge connection

3 By-pass screw 7 Solenoid

4 Pressure gauge connection 8 Supply to nozzle

A 230/240 V - 50 Hz

mains supply is required.

2 The supply must be fused at 5 Amp and there must only be

one common isolator for the boiler and control system, and it must provide complete electrical isolation.

3 A fused double pole switch or a fused three pin plug and

shuttered outlet socket should be used for the connection.

4 The power supply cable should be at least 0.75 mm

PVC

as specified in BS 6500, Table 16.

5 All the wiring external to the boiler must be in accordance

with the current I.E.E. Wiring Regulations.

6 Any room thermostat or frost thermostat used must be

suitable for use on mains voltage.

7 The boiler requires a permanent mains supply, do not

interrupt it with any external time control.

8 In the event of an electrical fault after installation of the

boiler, the following electrical system checks must be carried out:- Short circuit, Polarity, Earth continuity and Resistance to earth.

See Figs. 10 and 11

A sufficient permanent air supply to the boiler should be provided:

a For proper combustion of fuel and effective discharge

of combustion products to the open air.

b For the ventilation of any confined space in which the

boiler is installed to prevent overheating of the boiler any equipment in and near the boiler.

c For the satisfactory operation of any draught stabiliser

which may be fitted.

It should be both the designer's and installer's concern that the air required for these functions be introduced so as to cause as little discomfort as possible to the building occupants and thus to offer them the least temptation to obstruct the ventilators.

Further details may be obtained from BS 5410:1:1997.

5 - GENERAL BOILER INFORMATION

Combi V3, Combi Max and Condensing Combi Models

5.4

lectricity supply

5.4

Air supply

The boiler must be earthed.

Notes:

For a boiler fitted in a compartment, which is ventilated as shown, no additional allowance is necessary.

Open flue - Extract fans, where needed, should be in accordance with Section 4.4.7 in BS 5410 Part 1 1997.

Fig. 10 - Air supply for room sealed balanced flue boilers

+ 44 hidden pages

Grant Combi 90 V3, Combi Max, Condensing Combi 26, Condensing Combi 36 User, Installation And Servicing Instructions

Specifications and Main Features

Frequently Asked Questions

User Manual