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1
0020003656-02 11.05
Glow-worm, Nottingham Road, Belper, Derbyshire. DE56 1JT
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To be left with the user
Instructions for Use
High Efficiency Condensing Combination Boilers
Flexicom cx
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WARNING
GAS LEAK OR FAULT
Turn off the gas emergency control valve immediately. Eliminate all sources of ignition, i.e.smoking,
blowlamps, hot air guns etc. Do not operate electrical lights or switches either on or off.
Open all doors and windows, ventilate the area.
SHEETMETAL PARTS
This boiler contains metal parts (components) and care should be taken when handling and cleaning,
with particular regard to edges.
SEALED COMPONENTS
Under no circumstances must the User interfere with or adjust sealed parts.
Glow-worm service call: 01773 828100 Technical helpline: 01773 828300
General and Sales enquiries Tel: 01773 824639 Fax: 01773 820569
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3
24cx
30cx
G.C. No. 47-047-33
G.C. No. 47-047-34
12801
Position of name
badge (typical shown)
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Important Information 5
Boiler Design 6
Boiler Safety Devices 7
Maintenance 8
Boiler Operation 9
CONTENTS
These instructions are an integral part of the boiler and must, to comply with the current issue of the Gas Safety
(Installation and Use) Regulations, be left with the user.
Please read these instructions and follow them carefully for the safe and economical use of your boiler.
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5
Gas Safety (Installation and Use) Regulations
In your own interests and that of safety, it is the Law that ALL gas
appliances have been installed by a competent person in
accordance with the current issue of the regulations.
Control of Substances Hazardous to Health
Under Section 6 of The Health and Safety at Work Act 1974, we are
required to provide information on substances hazardous to health.
The adhesives and sealants used in this appliance are cured and give
no known hazard in this state.
Electrical Connection
The boiler MUST be earthed.
The boiler MUST be connected to a permanent 230V ac, 50Hz
supply.
Connection of the whole electrical system of the boiler, including any
heating controls, to the electrical supply must be through one common
isolator and must be fused to 3 Amps maximum.
The colours of three core flexible cable are, blue - neutral, brown - live,
green and yellow - earth.
All connections must be routed through the Installer Interface.
IMPORTANT NOTE
ALL electrical connections to the boiler
must be permanently fixed to a wall or a
sturdy support feature.
Gas Category
This boiler is for use only on G20 natural gas.
Testing and Certification
This boiler is certificated to the current issue of EN 483 for
performance and safety.
It is important that no alteration is made to the boiler unless
approved, in writing, by Glow-worm.
Any alteration not approved by Glow-worm, could invalidate the
certification, boiler warranty and may also infringe the current issue
of the statutory requirements.
CE Mark
This boiler meets the requirements of Statutory Instrument, No. 3083
of the Boiler (Efficiency) Regulations, and therefore is deemed to
meet the requirements of Directive 92/42/EEC on the efficiency
requirements for new hot water boilers fired with liquid or gaseous
fuels.
Type test for purposes of Regulation 5 certified by: Notified body
0087.
Product/production certified by: Notified body 0086.
The CE mark on this appliance shows compliance with:
1. Directive 90/396/EEC on the approximation of the laws of the
Member States relating to appliances burning gaseous fuels.
2. Directive 73/23/EEC on the harmonisation of the Laws of the
Member States relating to electrical equipment designed for use
within certain voltage limits.
3. Directive 89/336/EEC on the approximation of the Laws of the
Member States relating to electromagnetic compatibility.
Important Information
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Boiler Design
Description
These boilers are designed for use as part of a sealed
water central heating system with fully pumped circulation.
The pump, expansion vessel and associated safety
devices are all fitted within the boiler. The hot water PRE
HEAT temperature facility will improve the boilers hot water
delivery response.
The daily pump and 3 way valve exercise programme combined
with the built-in frost protection will help to maintain and
protect the boiler.
Once the controls are set the boiler operates automatically.
Compartment or Cupboard Installations
Ventilation is not required for compartment or cupboard
installations.
Do not use the compartment or cupboard for storage.
The minimum clearances to fixtures are shown in diagram 1.
Pluming from flue terminal
Like all condensing boilers it will produce a plume of
condensation from the flue terminal in cool weather. This is
due to the high efficiency and hence low flue gas temperature
of the boiler. It is normal and not a fault indication.
Diagram 1
150
5
55
150
600
A removable compartment door can be placed a minimum of
5mm in front of the appliance but there must be a
clearance of 600mm minimum from a fixed surface
Electrical Supply Failure
The boiler will not work without an electrical supply and normal
operation of the boiler should resume when the electrical
supply is restored.
If the boiler does not resume normal operation, check the
external controls, it may be necessary, to "reset" the boiler,
refer to the following section, "Boiler Safety Devices".
12652
*
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Boiler Safety Devices
Overheat Reset
The boiler software is designed to recognise the potential for
an overheat lockout and will shutdown before this happens.
To restart the boiler, press the reset button, see diagram 2.
If the boiler fails to resume normal operation and all external
controls are calling for heat, then call your Installation/Servicing
company or Glow-worm service.
Frost Protection
With the gas and electric supplies ON and irrespective of
any room thermostat setting, the integral frost protection
device will operate the pump when the temperature of the
boiler water falls below 8
O
C.
A timer is used so that the temperature can be checked
periodically. After 10 minutes the pump will be stopped if the
temperature is higher than 10
O
C or has already reached
35
O
C.
The burner will only activate if the boiler temperature does
not reach 10
O
C after 30 minutes or at any time if the
temperature drops to 5
O
C.
The burner will switch off when the temperature reaches
35
O
C.
NOTE: Any other exposed areas of the system should be
protected by a separate frost thermostat.
Condensate Drain Blockage
As a safety feature the boiler will stop working if the condensate
drain becomes blocked. During freezing conditions this may
be due to the forming of ice in the condense drain external to
the house. Release an ice blockage by the use of warm cloths
on the pipe. The boiler should then restart. Contact your
Installation/Servicing company or Glow-worm service if the
fault persists.
Safety Discharge Valve
A safety discharge valve and discharge pipe is fitted to the
boiler. This valve MUST not be touched. If there is any
discharge from the pipe, switch off the boiler electrical supply,
then call your Installation/Servicing company or Glow-worm
service.
Diagram 2
°
RESET
DIGITAL DISPLAY
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Sealed Water Systems
The draining, refilling and pressurising MUST be carried out
by a competent person, contact your Installation/Servicing
company or Glow-worm Service.
Spare Parts
REMEMBER, When replacing a part on this boiler, 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 Glow-worm.
If replacement parts are required contact Glow-worm’s own
service organisation using the telephone number on the
inside front cover of this booklet.
Please quote the name of the boiler, this infomation will be on
the name badge on the front case.
If in doubt seek advice from the local gas company or Glow-
worm’s own service organisation using the telephone number
on the inside front cover of this booklet.
Servicing
To ensure the continued efficient and safe operation of the
boiler it is recommended that it is checked and serviced at
regular intervals. The frequency of servicing will depend upon
the site conditions and usage, but in general, once a year
should be enough.
If this boiler is installed in a rented property in the UK there is
a duty of care imposed on the owner of the property by the
current issue of the Gas Safety (Installation and Use)
Regulations, Section 35.
Servicing/maintenance should be carried out by a competent
person in accordance with the rules in force in the countries
of destination.
To obtain service, please call your installer or Glow-worm’s
own service organisation using the telephone number on the
inside front cover of this booklet.
Cleaning
The boiler casing can be cleaned using a mild liquid detergent
with a damp cloth, then a dry cloth to polish.
Do not use any form of abrasive or solvent cleaner as you may
damage the paintwork.
Frost Protection
If the mains electricity and gas services are to be turned off for
any long periods during severe weather, it is recommended
that the whole system, including the boiler, should be drained
to avoid the risk of freezing.
Maintenance
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Boiler Operation
Diagram 3
Isolating Valves
1. Check that all isolating valves and the Gas cock,
on the boiler are open and that water flows from the
hot water tap.
2. If you are in any doubt about the boiler being filled
with water contact your installer or Glow-worm's own
service organisation using the telephone number on
the inside front cover of this booklet.
Do not operate the boiler without water.
3. Check that the electrical supply to the boiler is ON and
that all taps are closed and there is no demand from
any external controls.
4. The digital display, see diagram 2, will indicate the
system pressure, which should read at least 0.7bar
(recommended 1.0bar), if the pressure is less,
reconnect the filling loop and pressurise as described
in the following section, Filling Loop.
5. To operate or switch off the boiler follow the
instructions as described on the following pages.
6. Set any external controls as required.
Filling Loop
Turn the central Heating Flow isolation valve into the filling
position as indicated diagram 3 and gently opening both
taps until the correct pressure is indicated on the display.
If the loss of pressure problem persists, you MUST contact
your Installation / Servicing company or Glow-worm
Service.
12784
ISOLATING VALVES
A Central Heating - Flow (closed)
B Gas cock - (closed)
C Cold Water - Inlet (closed)
D Central Heating - Return (closed)
E Filling Loop Taps (inset shown open)
A
B
C
D
E
Filling
position
12783
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Description
The boiler User controls consist of a "MODE" button, refer
to diagram 6, which, when pressed and held for 2
seconds, enters the Central Heating function indicated by a
flashing radiator symbol. Each press of the "MODE" button
will now cycle between Domestic Hot Water function
(flashing tap) and Central Heating (flashing radiator). After
10 seconds of inactivity the display will reset to indicate the
water pressure.
The "SELECTOR" buttons are used to turn OFF or set the
Central Heating (38 - 82
O
C) / Domestic Hot Water (40 -
60
O
C) temperature during the respective functions
indicated above.
To access the Pre Heat function hold in the "+" button for 5
seconds. The display will indicate (flashing) if it is ON/
OFF(OF). Pressing the "-" button will switch the Pre Heat
OFF and pressing the "+" button will switch it ON. After 10
seconds of inactivity the display will reset to indicate the
water pressure.
If a fault occurs, indicated by a flashing 'F' and code
number, press the reset button positioned below the digital
display.
If a fault persists, indicated by a flashing 'F' and code
number, contact your installer/service provider or Glow-
worm Service, using the telephone number on the inside
front cover of this booklet.
Boiler Operation - User Controls
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Boiler Operation - Display
12873
°
RESET BUTTON
DIGITAL DISPLAY
SELECTOR BUTTONS
MODE BUTTON
1. Press and hold for 2
seconds for Central
Heating
Press to toggle between
2. Domestic Hot Water
3. Central Heating
SELECTOR BUTTON FUNCTION
1. Increase Temperature
2. Press and hold for 5 second
s
for Pre Heat
3. Pre Heat ON
SELECTOR BUTTON FUNCTION
1. Decrease Temperature
2. Deactivate Central Heating
and Domestic Hot Water
3. Pre Heat OFF
°C
bar
DOMESTIC HOT WATER
CENTRAL HEATING
TEMPERATURE
SYSTEM PRESSURE
BURNER DEMAND
Diagram 6
bar
OFF
bar
°C
°C
Central Heating and Domestic Hot water
activated but with no demand,
system pressure indicated.
Central Heating active with demand
indicated by temperature
and burner symbol.
Domestic Hot water active with demand,
indicated by temperature and
burner symbol.
Pre Heat flashing ON.
Pre Heat flashing OFF.
Holiday Mode:
Central Heating and Domestic Hot water
de-activated, OFF, system pressure
indicated.
°C
Domestic Hot water Pre Heat function has
activated.
OPERATION
12874
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Because of our constant endeavour for improvement, details may vary slightly from those shown in these instructions.
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