Keston Combi C35 Manuel utilisateur

EVERYTHING IS POSSIBLE

Combi C30 & C35

USER GUIDE

July 2018 UIN 215417 A04

When replacing any part on this appliance, use only spare parts that you can be assured

conform to the safety and performance speciﬁcation that we require. Do not use

reconditioned or copy parts that have not been clearly authorised by Keston.

For the very latest copy of literature for speciﬁcation and maintenance practices visit our

website www.keston.co.uk where you can download the relevant information in PDF

format.

THE BENCHMARK SERVICE INTERVAL RECORD MUST BE COMPLETED AFTER EACH SERVICE

Keston is a member of the Benchmark scheme and fully supports the aims of the programme.

Benchmark has been introduced to improve the standards of installation and commissioning of central

heating systems in the UK and to encourage the regular servicing of all central heating systems to

ensure safety and efciency.

CONTENTS

1. Introduction ................................................... 3

Safety .............................................................. 3

Electricity Supply ............................................. 3

Important Notes............................................... 3

2. Boiler Operation ............................................ 4

Controls Diagram............................................. 4

To Start the Boiler ............................................ 4

Operation Modes............................................. 5

Preheat Domestic Hot Water........................... 5

Control of Water Temperature ......................... 5

Efcient Heating System Operation................. 6

Weather Compensation................................... 6

Boiler Frost Protection..................................... 6

Boiler Restart................................................... 6

Mains Power Off.............................................. 6

3. System Water Pressure ................................ 7

4. Condensate Drain.......................................... 8

5. General Information ...................................... 9

Boiler Pump..................................................... 9

Minimum Clearances....................................... 9

Escape of Gas................................................. 9

Cleaning .......................................................... 9

Maintenance.................................................... 9

6. Points for the Boiler User ........................... 10

Troubleshooting..............................................11

7. Display Functions -

Normal Operation

.. 12-13

8. Display Functions - Settings Changed...... 13

9. Display Functions - Fault Messages..... 14-18

All Gas Safe Register installers carry a Gas Safe Register ID card, and have a registration number. Both should be recorded in the

Benchmark Commissioning Checklist. You can check your installer by calling Gas Safe Register direct on 0800 4085500.

1. INTRODUCTION

The Keston Combi C is a combination boiler providing both

central heating and instantaneous domestic hot water. Featuring

full sequence automatic ignition and fan assisted combustion.

Due to the high efciency of the boiler, condensate is produced

from the ue gases and this is drained to a suitable disposal point

through a plastic waste pipe at the base of the boiler. A condensate

‘plume’ will also be visible at the ue terminal.

Safety

CURRENT GAS SAFETY (INSTALLATION & USE)

REGULATIONS OR RULES IN FORCE.

In your own interest, and that of safety, it is the law that this

boiler must be installed by a Gas Safe Registered Engineer, in

accordance with the above regulations.

In IE, the installation must be carried out by a Registered Gas Installer

(RGII) 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.

It is essential that the instructions in this booklet are strictly

followed, for safe and economical operation of the boiler.

ELECTRICITY SUPPLY

This appliance must be earthed.

Supply: 230 V ~ 50 Hz. The fusing should be 3A.

IMPORTANT NOTES

• This appliance must not be operated without the casing

correctly tted and forming an adequate seal.

• If the boiler is installed in a compartment then the

compartment MUST NOT be used for storage purposes.

•

If it is known or suspected that a fault exists on the boiler

then it MUST NOT BE USED until the fault has been

corrected by a Gas Safe Registered Engineer or in IE a

Registered Gas Installer (RGII).

•Under NO circumstances should any of the sealed

components on this appliance be used incorrectly or

tampered with.

• This appliance can be used by children

8 years and above. Also persons with

reduced physical, sensory or mental

capabilities, or lack of experience

and knowledge, provided they have

been given supervision or instruction

concerning use of the appliance in a

safe way and understand the hazards

involved. Children shall not play with

the appliance. Cleaning and user

maintenance shall not be made by

children without supervision.

MINMAX MIN

MODECENTRAL HEATINGHOT WATER

BOILER

OFF

MAX

Legend

A. Domestic Hot Water Preheat On/Off Knob

B. Domestic Hot Water Temperature Knob

C. Central Heating Temperature Knob

D. Mode Knob

E. Boiler Status

F. Burner ‘on’ Indicator

G. System Pressure Gauge

H. Central Heating Economy Setting

TO START THE BOILER

If a programmer is tted refer to separate instructions for the

programmer before continuing.

Start the boiler as follows:

1. Set the mode knob (C) to ‘BOILER OFF’.

2. Set the Domestic Hot Water temperature knob (A) and

Central Heating temperature knob (B) to ‘MAX’.

3. Ensure that all hot water taps are turned off.

Switch on electricity to the boiler and check that all external

controls, e.g. programmer and room thermostat, are on.

4. Set the mode knob (C) to ‘ ’ (winter).

The boiler will commence ignition sequence, supplying heat to

the central heating, if required.

Note. In normal operation the boiler status display (D) will display

messages (see section 7).

Note. Boiler frost protection - boiler will re if temperature is below 5ºC.

During normal operation the burner on symbol (E) will remain

illuminated when the burner is lit.

Note. If the boiler fails to light after ve attempts the following

fault messages will be displayed:

To restart the boiler, press restart. The boiler will repeat the ignition

sequence. If the boiler still fails to light consult a Registered Gas

Installer, or in IE a Registered Gas Installer (RGII).

2. BOILER OPERATION

Legend

Domestic Hot Water Temperature Knob

B. Central Heating Temperature Knob

C. Mode Knob

D. Boiler Status Display

E. Burner ‘on’ Indicator

F. Central Heating Economy Setting

G. Pressure Gauge

H. Restart Button

I. Preheat button

AG DI HE B F C

Ignition Lockout 1/2

Check Other Gas

Appliances Work

Restart Boiler

Restart Menu

Ignition Lockout 2/2

If Fault Persists

Contact Installer

Restart Menu

OPERATION MODES

Winter Conditions -

(Central Heating and Domestic Hot Water

required)

Set the mode knob (C) ‘ ’ (winter).

The boiler will re and supply heat to the radiators.

The domestic hot water preheat will operate with the preheat

button (I) set to ‘Preheat On’.

Summer Conditions - (Domestic Hot Water only required)

Set the mode knob (C) to ‘ ’ (summer).

Set the central heating demand on the external controls to OFF.

The domestic hot water preheat will operate with the preheat

knob (I) set to ‘Hot Water On’.

Boiler Off

Set the mode knob (C) to ‘BOILER OFF’. The boiler mains

power supply must be left on to enable frost protection (see

Frost Protection).

PREHEAT - DOMESTIC HOT WATER

The domestic hot water heat exchanger within the boiler can

be kept preheated to provide faster delivery of hot water at the

tap. This is achieved by pressing the “PREHEAT” button to

‘PREHEAT ON’.

The boiler will operate periodically for a few seconds to

maintain the domestic hot water heat exchanger in a preheated

condition. The average time period between operation is 90

minutes. This may vary considerably due to the surrounding

ambient temperature of the boiler. The boiler will operate

whenever there is a demand for domestic hot water.

If standard hot water delivery is satisfactory press the

“PREHEAT” button to ‘PREHEAT OFF’.

CONTROL OF WATER TEMPERATURE

Domestic Hot Water

The domestic hot water temperature is limited by the boiler

controls to a maximum temperature of 65ºC, adjustable via

the domestic hot water temperature knob (A). However at

low DHW draw off rates the maximum temperature may

exceed 65ºC.

Approximate temperatures for domestic hot water:

Knob Setting Hot Water Temperature (approx.)

Minimum 40ºC

Maximum 65ºC

Due to system variations and seasonal temperature

uctuations domestic hot water ow rates/temperature rise

will vary, requiring adjustment at the tap : the lower the ow

rate the higher the temperature, and vice versa.

Central Heating

The boiler controls the central heating radiator temperature

to a maximum of 80

C, adjustable via the central heating

temperature knob (B).

Approximate temperatures for central heating:

Knob Setting

Central Heating Radiator Temperature (approx.)

Minimum 30ºC

Maximum 80ºC

For economy setting ‘ ’ refer to Efcient Heating System

Operation.

EFFICIENT HEATING SYSTEM OPERATION

The boiler is a high efciency, condensing appliance which

will automatically adjust its output to match the demand for

heat. Therefore gas consumption is reduced as the heat

demand is reduced.

The boiler condenses water from the ue gases when operating

most efciently. To operate your boiler efciently (using less

gas) turn the central heating temperature knob (B) to the ‘

‘ position or lower. In winter periods it may be necessary

to turn the knob towards the ‘max’ position to meet heating

requirements. This will depend on the house and radiators

used.

Reducing the room thermostat setting by 1ºC can reduce gas

consumption by up to 10%.

WEATHER COMPENSATION

When the Weather Compensation Kit (supplied as standard) is

tted to the system then the central heating temperature knob

(B) becomes a method of controlling room temperature. Turn

the knob clockwise to increase room temperature and anti-

clockwise to decrease room temperature. Once the desired

setting has been achieved, leave the knob in this position

and the system will automatically achieve the desired room

temperature for all outside weather conditions.

BOILER FROST PROTECTION

The boiler is tted with frost protection that operates in all

modes, provided the power supply to the boiler is always

turned on. If the water in the boiler falls below 5ºC, the frost

protection will activate and run the boiler to avoid freezing.

The process does not guarantee that all other parts of the

system will be protected.

If a system frost thermostat has been installed, the boiler

must be set in winter mode, ‘ ’, for the system frost

protection to run.

If no system frost protection is provided and frost is likely

during a short absence from home it is recommended to leave

the system heating controls or built in programmer (if tted)

switched on and run at a reduced temperature setting. For

longer periods, the entire system should be drained.

BOILER RESTART

To restart the boiler, when directed in the listed fault messages

(see section 9), press “Restart”. The boiler will repeat its

ignition sequence. If the boiler still fails to start consult a

Gas Safe Registered Engineer or in IE a Registered Gas

Installer (RGII).

MAINS POWER OFF

To remove all power to the boiler the mains power switch

must be turned off.

3. SYSTEM WATER PRESSURE

The system pressure gauge (G - see page 4) indicates the central heating system pressure.

If the pressure is seen to fall below the original installation pressure of 1-2 bar over a period

of time and continue to fall then a water leak may be indicated. In this event re-pressurise the

system as shown below. If unable to do so or if the pressure continues to drop a Gas Safe

Registered Engineer or in IE a Registered Gas Installer (RGII) should be consulted.

THE BOILER WILL NOT OPERATE IF THE PRESSURE HAS REDUCED TO LESS THAN 0.3 BAR UNDER THIS CONDITION.

Cap

Plug

Filling Loop

Filling Position

Starting Position

Cap

Filling Loop

Handle

(Blue)

Domestic Hot Water

(DHW) Inlet Valve

Filling

Loop

Plug

To Top up the system :-

1. Ensure both A& Bhandles (blue) are in closed position

(as shown below)

2. Remove the plug and cap and retain.

Connect the lling loop to the Domestic Hot Water (DHW) inlet

and tighten. Also ensure that the other end of lling loop is

hand tight.

4. Turn the Domestic Hot Water (DHW) Inlet Ablue handle

to the horizontal position.

5. Ensuring no leaks are seen, gradually turn the lling loop

handle (blue) Bto the horizontal position.

6. Wait for the pressure gauge to reach 1 to 1.5 bar.

7. Once pressure is reached turn valves A& Bback to

the closed position.

8. Disconnect the lling loop, replace cap and plug. Note

there can be some water spillage at this point.

4. CONDENSATE DRAIN

This appliance is tted with a siphonic condensate trap system

that reduces the risk of the appliance condensate from freezing.

However should the condensate pipe to this appliance freeze,

please follow these instructions:

a. If you do not feel competent to carry out the defrosting

instructions below please call your local Gas Safe

Registered installer for assistance.

If you do feel competent to carry out the following instructions

please do so with care when handling hot utensils. Do not

attempt to thaw pipework above ground level.

If this appliance develops a blockage in its condensate pipe, its

condensate will build up to a point where it will make a gurgling

noise prior to locking out displaying “Ignition Lockout” on the

display. If the appliance is restarted it will make a gurgling noise

prior to it locking out displaying “Ignition Lockout” on the display..

To unblock a frozen condensate pipe;

1. Follow the routing of the plastic pipe from its exit point on

the appliance, through its route to its termination point.

Locate the frozen blockage. It is likely that the pipe is

frozen at the most exposed point external to the building

or where there is some obstruction to ow. This could be

at the open end of the pipe, at a bend or elbow, or where

there is a dip in the pipe in which condensate can collect.

The location of the blockage should be identied as closely

as possible before taking further action.

2. Apply a hot water bottle, microwaveable heat pack or a

warm damp cloth to the frozen blockage area. Several

applications may have to be made before it fully defrosts.

Warm water can also be poured onto the pipe from a

watering can or similar. DO NOT use boiling water.

3. Caution when using warm water as this may freeze and

cause other localised hazards.

Once the blockage is removed and the condensate can ow

freely, restart the appliance. (Refer to “To Start the boiler”)

5. If the appliance fails to ignite, call your Gas Safe Registered

engineer.

Preventative Solutions

During cold weather, set the central heating temperature knob

(B) to maximum, (Must return to original setting once cold

spell is over).

Place the heating on continuous and turn the room thermostat

down to 15ºC overnight or when unoccupied. (Return to normal

after cold spell).

5. GENERAL INFORMATION

BOILER PUMP

The boiler pump will operate briey as a self-check once every

24 hours, regardless of system demand.

MINIMUM CLEARANCES

Clearance of 165mm (6 1/2”) above, 100mm (4”) below, 2.5mm

(91/8”)

at the sides and 450mm (17 3/4”) at the front of the boiler

casing must be allowed for servicing.

BOTTOM CLEARANCE

Bottom clearance after installation can be reduced to 5mm

This must be obtained with an easily removable panel, to enable

the system pressure gauge to be visible and to provide the

100mm clearance required for servicing.

SERVICE REQUEST FUNCTION

When the boiler has been installed for more than 1 year the following

message will appear on screen:

Press “Restart” to clear this message.

ESCAPE OF GAS

Should a gas leak or fault be suspected contact the National Gas

Emergency Service without delay. Telephone 0800 111 999.

Ensure that;

- All naked ames are extinguished

- Do not operate electrical switches

- Open all windows and doors

CLEANING

For normal cleaning simply dust with a dry cloth. To remove stubborn

marks and stains, wipe with a damp cloth and nish off with a dry

cloth. DO NOT use abrasive cleaning materials.

MAINTENANCE

The appliance should be serviced at least once a year by a Gas

Safe Registered Engineer or in IE a Registered Gas Installer

(RGII).

6. POINTS FOR THE BOILER USER

Note. In line with our current warranty policy we would ask that you check through the following guide to identify any

problems external to the boiler prior to requesting a service engineers visit. Should the problem be found to be other

than with the appliance we reserve the right to levy a charge for the visit, or for any pre-arranged visit where access is

not gained by the engineer.

FOR ANY QUERIES PLEASE RING THE

KESTON CONSUMER HELPLINE : 01482 443005

NOTE. BOILER RESTART PROCEDURE -

To restart boiler, press the Restart button.

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