IDEAL MINI C24 User manual

mini
When replacing any part of this appliance, use only spare parts that you can be
assured conform to safety and performance specification that we require. Do not use
reconditioned or copy parts that have not been clearly authorised by Ideal Boilers
Your Ideal us ers guide
For installation and servicing guide see
reverse of book
users guide
C24,C28,C32
S24,S28

Mini
Mini C24 G.C. appliance No. 47---348---18
Mini C28 G.C. appliance No. 47---348---19
Mini C32 G.C. appliance No. 47---348---25A
Mini S24 G.C. appliance No. 41---392---98
Mini S28 G.C. appliance No. 41---392---99
Destination countries: GB, IE
INTRODUCTION
Mini are wall mounted, room sealed, non condensing boilers
featuring full sequence automatic spark ignition and fan
assisted combustion.
Mini C24,Mini C28 and Mini C32 are low water content
combination gas boilers.
Mini S24 and Mini S28 are low water content system gas
boilers.
SAFETY
Current Gas Safety (Installation & Use)
Regulationsorrulesinforce
In your own interest, and that of safety, it is the law that this boiler
must be installed by CORGI registered installer or in IE a
competent person, in accordance with the above regulations.
It is essential that the instructions in this booklet are strictly
followed, for safe and economical operation of the boiler.
ELECTRICITY SUPPLY
Theappliancemustbeefficientlyearthed.
Supply 230 V 50 Hz. The fusing should be 3.15 A.
Connection must be made in a way that allows complete
isolation of the electrical supply, such as a double pole switch,
having a 3 mm (1/8”) contact separation in both poles, or a
plug and socket serving only the boiler and system controls.
The means of isolation must be accessible to the user after
installation.
IMPORTANT NOTES
FThis appliance must not be operated without the casing
correctly fitted and forming an adequate seal.
FIf the boiler is installed in a compartment then the
compartment MUST NOT be used for storage purposes.
FUnder no circumstances should any of the sealed
components on this appliance be used incorrectly or
tampered with.
FIf it is known or suspected that a fault exist on the boiler
then it MUST NOT BE USED until the fault has been
corrected by a CORGI registered installer or in IE a
competent person.
FThis appliance is not intended for use by persons
(including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction
concerning use of the appliance by a person responsible
for their safety.
FChildren should be supervised to ensure that they do not
play with the appliance.
MINIMUM CLEARANCES
Clearances of 254 mm (10”) above and below, 25 mm (1“)
at left, 50 mm (2“) at right and 450 mm (17 3/4“) at the front of
theboilercasemustbeallowedforservicing.
After installation the following clearances are allowable during
use, providing the encasing parts are removeable for servicing:
The bottom clearance can be reduced to 20mm (3/4”).
The front clearance can be reduced to 50mm (2”).
BOILER CONTROLS
BC D E F GAMini C
Mini S
A Appliance operation lamps
B Domestic hot water temperature control
Mini C24,Mini C28,Mini C32.
BServiceknobMini S24,Mini S28.
C Main switch and radiator temperature control
D Boiler reset button
E Lock --- out signal lamp
F Programmer (optional) for Mini C24,Mini C28,Mini C32
boilers only.
G System pressure and temperature gauge
TO LIGHT THE BOILER
1 Check that the valves located in the lower part of the boiler
are open.
2 Switch the electricity supply on. The appliance operation
lamps A will flash every 4 seconds (stand--- by condition).
For combination models Mini C24, Mini C28 and Mini C32
3 If the boiler is to be used for CH and DHW position the
main switch as in the following illustration. The appliance
On lamp A will flash every 2 seconds (operating boiler).
C
A
ForsystemmodelsMiniS24andMiniS28
4 To operate the boiler position the main switch as in the
following illustration. The appliance operation lamps A will
flash every 2 seconds (operating boiler).
C
A
THE BENCHMARK SERVICE INTERVAL RECORD MUST BE COMPLETED AFTER EACH SERVICE
Ideal Stelrad Group is a member of the Benchmark initiative and fully supports the aims
of the programme. Benchmark has been introduced to improve the standards of instal-
lation and commissioning of central heating systems in the UK and to encourage the
regular servicing of all central heating systems to ensure safety and efficiency.
All CORGI registered installers carry a CORGI ID card, and have a registration number. Both should be recorded in the Benchmark
Commissioning Checklist. You can check your installer by calling CORGI direct on 01256 372300.

DIAGNOSTIC LIGHTS
The following table gives a summary of the relationship
between each of the possible light combinations and their
meaning during normal operaion of the boiler
Normally operating boiler
CH operation
DHW operation (only for combination boilers
Mini C24,Mini C28,Mini C32)
Frost protect operation
Lamp
OFF
Flashing lamp, alone
or simultaneously
with an other lamp.
Flashing lamp,
alternate with
another lamp.
If the lights sequence observed on the boiler is not included
above then a fault is indicated.
reference should be made to the Installation Instructions or
consult a CORGI registered installer.
CONTROL OF CH TEMPERATURE
The output temperature of CH water is adjustable from a
minimum of about 38°C to a maximum of about 80°Cby
turning the knob C.
Approx CH flow temperatures for the boiler thermostat
settings:
C
Minimum (38 ˚C) Maximum (80 ˚C)
CONTROL OF DHW TEMPERATURE
(Mini C24, Mini C28 and Mini C32)
ThetemperatureoftheDHWleavingtheboilercanbevaried
from a minimum of about 35°C to a maximum of about 55°C
(within the power limits of the appliance) by turning the
temperature control knob B.
B
Minimum (35 ˚C) Maximum (55 ˚C)
Adjustment of the DHW temperature is completely separate
from that of the CH circuit.
The adjustment system integrated within the boiler
automatically controls the flow of gas to the burner in order to
keep the temperature of DHW delivered constant, between
the limits of maximum and minimum output.
Where the demand is at a low level or with the temperature
set to the minimum, it is normal to see a cycle of lighting and
extinguishing of the burner when running.
Adjustment
It is advisable to adjust the DHW temperature to a level
commensurate with the demand, minimising the need to mix
with cold water. In this way, the automatic control facilities will
be fully exploited.
Moreover, where the amount of limescale present in the water
may be particularly great, not exceeding the position as
shown in the following illustration (about 50 ˚C) minimises
annoying incidences of scale deposits and clogging.
B
In these cases, however, it is advisable to install a small water
treatment device. With such a device you should avoid
periodic descaling.
Consequently, the DHW heat exchanger will keep its
performance consistent for a longer period of time with
resulting gas savings.
TO SHUT DOWN THE BOILER
For short periods
To turn the boiler off set the function selector C to the O
position.
The appliance operation lamps A will flash every 4 seconds.
For long periods
When you do not expect to use the boiler for a long period:
1 Switch the electricity supply off.
2 Shut off the gas supply cock and the valves for the water
circuits fitted under the boiler.
3 If necessary, empty the water circuits.
FROST PROTECTION
Mini C24,Mini C28 and Mini C32 appliances are provided
with a built in anti---freeze system that operates the boiler
when the temperature is below 5 ˚C
Therefore, when the boiler is not lit and used in cold weather,
with consequent risk of freezing do not isolate the boiler
from the electricity supply or close the gas inlet cock.
ESCAPE OF GAS
Should a gas leak or fault be suspected contact your local
gas supplier without delay.
Do not search for gas leaks with a naked flame.
CLEANING
For normal cleaning simply dust with a dry cloth.
To remove stubborn marks and stains use a damp cloth and
mild detergent. Do not use abrasive cleaning materials.
MAINTENANCE
The appliance should be serviced at least once a year by a
CORGI registered installer.
FAULTS
No heating or hot water
Check that gas and electricity are available at the boiler and
that all switches are on.
Check that the system water pressure gauge G reads at least
0,5 bar.
Check the lock---out signal lamp E. If it is illuminated press the
boiler reset button D to restart the ignition sequence.
Hotwaterbutnoheating
Check that the programmer and room thermostat (if fitted) are
both calling for heat.
Heating but no hot water
Check that cold water flows out of the taps at a minimum rate
of 3.5 litres per minute (or 1 pint in 10 seconds or less). If not,
look for stop valves not fully open.
Ifthesesimplechecksfailtosolvetheproblem,orthe
problem recurs, consult your service engineer.

PointsforBoilerUser
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.
Troubleshooting --- Typical Non Product Faults
Problem Solution
Boiler is not working for central heating
or hot water
FIs there power to the boiler i.e. is the left hand side green LED (A) alight and
flashing every 4 seconds. If not this is not a boiler fault --- contact the installer
FCheck pressure gauge on boiler shows a minimum of 1 bar.
If not re---pressurise via the filling loop to 1 bar (if unsure contact your installer), turn
off the tap on the filling loop and press the reset button (D) to reset the boiler. If
unable to do so or if the pressure continues to drop after filling then contact your
installer
FIs the lockout signal lamp (E) alight --- Press boiler reset button (D) --- If boiler still
does not fire contact the installer
Boiler goes through ignition sequence but
will not fire for either central heating or hot
water and then goes to ignition lockout
FCheck gas supply (try another gas appliance cooker/fire etc) If no gas supply
then this is not a boiler fault --- Contact the gas supplier
Fan & pump run continuosly but there isno
attemptatignition
FCheck that the air pressure switch test caps, on top of the boiler, are fitted
correctly.
Mini C Only
Operating for hot water but will not operate
for central heating
FCheck that integral programmer is set to an “on” period and the function switch
is set to “auto”--- If it still does not operate contact your installer
FIf fitted with an external programmer check that the central heating channel is set
at an “on” period --- If it still does not operate contact your installer
FCheck the room thermostat is set at the required temperature --- Test the room
thermostat by turning fully up --- If this does not respond contact your installer
FCheck the radiator temperature control (C) is set at the winter setting for central
heating
The nature of all combination boilers is to heat up water directly from the incoming mains water supply directly through the boiler to
supply domestic hot water at the stated flow rates, (as shown in the boiler installation instructions), to achieve a 35˚C temperature rise.
As the ambient temperature of the cold main varies during the summer and winter months it is likely in the colder winter months that
the flow rate will need to be reduced at the outlet taps to achieve the same temperatures achieved in the warmer summer months.
This is not a fault with the appliance but is relevant to the varying temperature of the incoming cold mains water supply.
Mini S Only
Operating for hot water but will not operate
for central heating
FIf fitted with an external programmer check that the central heating channel is set
at an “on” period --- If it still does not operate contact your installer
FCheck the room thermostat is set at the required temperature --- Test the room
thermostat by turning fully up --- If this does not respond contact your installer
Operating for central heating but will not
operate for hot water
FIf fitted with an external programmer check that the domestic hot water channel
is set at an “on” period --- If it still does not operate contact your installer
FCheck the cylinder thermostat is set at the required temperature --- Test the cylinder
thermostat by turning fully up --- If this does not respond contact your installer
Ideal Stelrad Group pursues a policy of continuing improvement in the design and per-
formance of its products. The right is therefore reserved to vary specification without no-
tice.
Ideal Boilers, P.O. Box 103, National Ave, Kingston Upon Hull, HU5 4JN.
Tel. [phone] Fax. [phone]. Registration No. London 322 137.
Ideal Consumer Helpline:
01482 498660
www.idealboilers.com