IDEAL istor HE325 User manual

2istor - User's
Legend
A. Boiler ON/OFF switch.
C. Display.
D. Reset button.
E. LED.
F. CH thermostat knob.
1 BOILER CONTROLS
Introduction
The istor HE260 & HE325 are fully automatically controlled,
condensing, system store, fan flued boilers.
Due to the high efficiency of the boiler, condensate is produced
from the flue gases and this is drained to a suitable disposal
point through the plastic waste pipe at the lower rear of the boiler.
A condensate 'plume' will also be visible at the flue terminal.
The istor is a system store boiler providing both central heating
and domestic hot water.
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 CORGI registered installer, 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 (boiler)
This appliance must be earthed.
Supply: 230 V ~ 50 Hz. The fusing should be 3A.
Connection must be made in a way that allows complete
isolation of the electrical supply such as a double-pole switch,
having a 3mm (1/8") contact separation in both poles, serving
only the boiler and system controls. Alternatively, a 3-pin
UNSWITCHED socket may be used. The means of isolation
must be accessible to the user after installation.
istor
G.C. Appliance No. HE260 ...... 41-394-13
G.C. Appliance No. HE325 ...... 41-394-14
(Natural Gas only)
Destination Countries: UK, IE
Electricity Supply (immersion heater)
Supply: 230 V ~ 50 Hz. The fusing should be 13A.
The immersion heater is supplied fitted to the cylinder and is
intended for use as a back up heat source for DHW should the
boiler fail for some reason. Optimum DHW performance will
not be achieved using the immersion heater only.
Wire the heater through a double-pole switch or controller,
having contact separation of at least 3mm, using a cable size
of at least 1.5sq. mm flexible cable, 85 oC rubber insulated
HOFR Sheathed, complying with BS6141 Table 8. It MUST be
fully earthed. Ensure all terminal connections are securely
made. Do not however use excessive force when tightening
terminals.
Important Notes
zThis appliance must not be operated without the casing
correctly fitted and forming an adequate seal.
zIf the boiler is installed in a compartment then the
compartment MUST NOT be used for storage purposes.
zIf 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 CORGI registered installer.
zUnder NO circumstances should any of the sealed
components on this appliance be used incorrectly or
tampered with.
In cases of repeated or continuous shutdown a CORGI
registered installer should be called to investigate and rectify the
condition causing this and carry out an operational test. Only the
manufacturers original parts should be used for replacement.
Minimum Clearances
Clearances of 165mm (6 1/2") above, 5mm (1/4") at the sides
and 450mm (17 3/4") at the front of the boiler casing must be
allowed for servicing.
The minimum front clearance allowed when built into a
cupboard is 5mm.
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.
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 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 efficiency.

3istor - User's
CAUTION. To avoid the possibility of injury during the installation, servicing or cleaning
of this appliance care should be taken when handling edges of sheet steel components.
To light the boiler. Refer to Frame 1
Refer to the programmer section of these instructions to set the
required programs.
1. CHECK THAT THE ELECTRICITY SUPPLY TO THE BOILER
IS OFF.
2. Set the mains ON/OFF switch (A) to OFF and CH thermostat
knob (F) to maximum.
3. Ensure that all DHW taps are turned off.
4. Switch ON the electricity supply to the boiler and check that
all external controls, e.g. programmer, room thermostat etc.,
are ON.
5. Set the mains ON/OFF switch to ON.
The boiler will commence the ignition sequence, first supplying
heat to preheat the domestic hot water and then to the central
heating, if required.
Note. In normal operation the control unit display (C) will show
codes:
Standby - no demand for heat.
CH being supplied.
DHW being supplied to reheat the cylinder.
During ignition, the LED (E) will flash.
During normal running the LED (E) will remain illuminated.
Note. If the boiler fails to light after 3 attempts the fault code
will be displayed.
Press the reset button (D) for 2 seconds then release. The
boiler will repeat the ignition sequence. If the boiler still fails to
light consult a CORGI registered installer.
Operation
Winter conditions - i.e. CH and DHW required.
The boiler will fire and supply heat to the radiators but will give
priority to DHW on demand.
The DHW will operate as described under 'Summer conditions'
during periods when there is no call for CH.
Summer conditions - i.e. DHW only required.
Set the CH external controls to OFF, or turn the CH thermostat
knob (F) to minimum.
The boiler will fire periodically to maintain the DHW cylinder in a
preheated condition and whenever there is a demand for DHW.
Note. The pump will operate briefly as a self-check once every
24 hours, regardless of system demand.
Approx. flow temperatures for the
boiler thermostat settings are:
Central Heating
Knob Setting CH Flow
Temp
oC (oF)
Max 82 (180)
Min 30 (86)
Control of water temperature
Domestic Hot Water
The DHW delivery temperature is controlled by thermostatic
mixer within the tank module (see illustration below).
Pull off the lower door from its locating pegs and adjust the
mixer valve to the required DHW delivery temperature.
IMPORTANT
60oC is the recommended maximum temperature.
Central Heating
The boiler controls the central heating radiator temperature to a
maximum of 82oC, adjustable via the CH thermostat knob (F).
ist8368
Domestic Hot Water
Knob DHW
setting Temp OC
Min 30
134
239
343
448
552
656
761
Max 6 5

4istor - User's
To shut down the boiler
1. For short periods
Set the mains ON/OFF switch (A) to OFF
2. For longer periods
Set the mains ON/OFF switch (A) to OFF, and switch the
electricity supply to OFF. For longer periods the entire
system should be drained.
To relight the boiler
Repeat the procedure detailed in 'To light the boiler'.
Frost protection
If no frost protection is provided and frost is likely during a short
absence from home, leave the heating controls (if fitted) at a
reduced temperature setting. For longer periods, the entire
system should be drained.
If the system includes a frost thermostat then, during cold
weather, the boiler should be turned OFF at the time switch (if
fitted) ONLY. The mains supply should be left switched ON, with
the boiler thermostat left in the normal running position.
Boiler overheat thermostat
This thermostat will shut down the boiler in the event of
overheating. Should this occur a fault code will be
displayed. Press the reset button (D) and the boiler will relight.
If the fault recurs, turn off the boiler and consult a CORGI
registered installer.
Flame failure
Should this occur a fault code will be displayed.
Press the rest button (D) and the boiler will relight.
If the fault recurs, turns off the boiler and consult a CORGI
registered installer.
Loss of system water pressure
The gauge (see illustration below) 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
then a water leak is indicated. In this event a CORGI registered
installer should be consulted.
DO NOT FIRE THE BOILER IF THE PRESSURE HAS
REDUCED TO ZERO FROM THE ORIGINAL SETTING.
Condensate Drain
The condensate drain must not be modified or blocked.
Blockage of the condensate drain, caused by debris or freezing,
can cause automatic shutdown of the boiler.
If freezing is suspected and the pipe run is accessible an
attempt may be made to free the obstruction by pouring hot
water over the exposed pipe and clearing any blockage from the
end of the pipe. If this fails to remedy the problem the
assistance of a CORGI registered installer should be sought.
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, wipe with a damp cloth
and finish off with a dry cloth.
DO NOT use abrasive cleaning materials.
Maintenance
The appliance should be serviced at least once a year by a
CORGI registered installer.
ist8369

5
istor - User's
Channel 1 (Radiator symbol) relate to the CH programme
Channel 2 (Tap symbol) relates to the DHW programme.
1. To set the time and day.
Move the right sliding switch to 'RUN'.
Press the 'HR' and 'MIN' simultaneously for 2-3 seconds.
Set the day button using the 'DAY' button.
Set the time pressing the 'HR' and 'MIN' buttons.
Approximately 15 seconds after setting the time and day the
display will automatically pick up the time of day (the colon
between the hours and minutes will flash).
2. To set the CH programme.
Set the right sliding switch to the radiator symbol.
Note. There is an in built default programme of:
Mon-Fri ON 6:30 OFF 8:30
ON 16:30 OFF 22:30
Sat-Sun ON 7:00 OFF 9:00
ON 16:00 OFF 23:00
(An ON period is designated by a 'light bulb' symbol being
present in the top right hand corner of the display).
Pressing the 'DAY' button allows the selection of:
Mon - Sun Separate days
Mon - Fri Inclusive
Sat - Sun Inclusive
Mon - Sat Inclusive
Mon - Sun Inclusive
Press the 'P' button to scroll through the ON and OFF times.
Press the 'HR' and 'MIN' buttons to change any of the pre-set
times.
To save the desired times move the right sliding switch to RUN.
3. To set the DHW programme.
Set the right sliding switch to the tap symbol.
Note. The default programme is as the CH programme
above, changing the times again is as above.
To save the desired times move the right switch to RUN.
4. To delete a switching time on CH or DHW
Set the right sliding switch to the radiator or tap symbol as
required. Use button ‘P’ to flag up the desired switching time,
Then press button ' ' and P simultaneously for 3-4
seconds. The display will show a flashing 0.00 and the
switching point is deleted.
5. To operate the programmer.
Set the right sliding switch to RUN.
Set the left sliding switch to AUTO.
An ON period will be designated by a light bulb symbol in the
top right hand corner of the display with either a '1' to
designate CH programme ON or a '2' to designate DHW
programme ON.
6. Manual Override CH.
To manually override the CH programme move the left
sliding switch to 'I'.
Press the ' ' button ONCE.
The No. '1' will flash in the display for approximately 3
seconds, after which a light bulb symbol will appear in the
display and the '1' will stop flashing.
To cancel the override move the left sliding switch to AUTO
after approximately 3 seconds the '1' and the light bulb
symbol will disappear.
7. Manual Override the DHW.
To manually override the DHW programme move the left
sliding switch to 'I'.
Press the button TWICE.
The No. '2' will flash in the display for approximately 3
seconds, after which a light bulb symbol will appear in the
display and the '2' will stop flashing.
To cancel the override move the left sliding switch to AUTO
after approximately 3 seconds the '2' and the light bulb
symbol will disappear.
8. Skip Function
Pressing the ' ' button ONCE for CH or TWICE for
DHW with the left sliding switch in the AUTO position will
change the programmed switching until the next programme
time is reached.
i.e. this function will turn an ON period to OFF and vice versa.
A '1' or '2' will appear in the display along with the light bulb
symbol and ' '.
To remove this function press the ' ' button ONCE to
select '1' (CH) and hold in for approximately 3 seconds.
The '1' or '2' along with the light bulb and ' ' symbol will
disappear.
2 PROGRAMMER SET UP

6istor - User's
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.
TROUBLESHOOTING - TYPICAL NON PRODUCT FAULTS
Problem Solution
Boiler is not working for
central heating or hot water.
• Check there is power to the boiler – switch (A) in the ON position and ‘0’ displayed on the
controls.
• If ‘0’ not displayed then not a boiler fault – contact your installer/service company.
• Check integral programmer is set to an ‘ON’ period and the relevant function selected i.e.
central heating or domestic hot water. Test by overriding the programmer by setting to
‘continuous. (refer to user instructions).
• Check room thermostat for central heating is set at the required temperature. To test operation
turn fully up. If no response contact your installer.
Boiler is not working for
central heating or hot water
and the display shows ‘
L:AL:A
L:AL:A
L:A ’
(flashing).
• Press reset button (D) for 2 seconds, the boiler should then re-light. If fault recurs this indicates
an overheat condition. The boiler should be turned off and your installer contacted.
• Check if ALL radiators have thermostatic radiator valves fitted. If they have contact your installer.
• Check for air locks in the boiler or system pipework. Vent air from radiators – press reset button
(D) and then release. The boiler should relight, if the fault recurs turn off the boiler and contact
your installer.
Boiler is not working for
central heating or hot water
and the display shows ‘
H:AH:A
H:AH:A
H:A ’
(flashing).
• Check pressure gauge on boiler shows a minimum of 1 bar. In order to view the pressure
gauge it will be necessary to remove the lower front panel (refer to installation
instructions).
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 turn the on/off switch (A) off and then back on again to reset the boiler. If
unable to do so or if the pressure continues to drop after filling then contact your installer.
• Check if ALL radiators have thermostatic radiator valves fitted. If they have contact your
installer.
Boiler is not working for
central heating or hot water
but attempts to fire by going
through 3 ignition attempts.
Display shows ‘
L : FL : F
L : FL : F
L : F ’(flashing).
• Press reset button (D) for 2 seconds to repeat ignition sequence.
• Check gas supply (try another appliance – cooker/fire etc.) – If no gas supply then not a boiler
fault – contact gas supplier.
• Check condensate pipe is not blocked or frozen. If blocked clear blockage – if not possible to
check contact your installer.
Domestic hot water is not to
the required temperature
• Adjust the mixing valve to the required output temperature – see user instructions for
temperature settings - In order to access the mixing valve it will be necessary to remove
the lower front panel (refer to installation instructions).

7
istor - User's
NOTES

Ideal Boilers, P.O. Box 103, National Ave, Kingston Upon Hull, HU5 4JN. Tel.
01482 492251 Fax. [phone]. Registration No. London 322 137.
Ideal Stelrad Group pursues a policy of continuing improvement in the design and performance
of its products. The right is therefore reserved to vary specification without notice.
Ideal Consumer Helpline
Tel: [phone]
www.idealboilers.com