Worcester danesmoor 12/14 User manual

HEATSLAVE
12/14, 15/19, 20/25, 26/32
FLOOR-STANDING OIL-FIRED COMBINATION BOILERS FOR
CENTRAL HEATING AND MAINS-FED DOMESTIC HOT WATER
USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
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EXCELLENCE COMES
AS STANDARD
Thank you for purchasing a Heatslave oil-fired central heating
boiler.
Heatslave oil boilers are made by Worcester and the strictest
quality control standards ever demanded are applied throughout
every stage of production.
Indeed, Worcester, part
of the Bosch Group have led
the field in innovative boiler
design and performance for
more than 40 years.
The result is that
your new Heatslave boiler
offers you the very best of
everything – quality, efficien-
cy, economical running costs,
proven reliability and value
for money.
What’s more, you also have the assurance of our no-
nonsense 1 year parts and labour guarantee.
Page No.
General Information ....... 3
Your Heatslave system
controls........................... 5
How to operate your
boiler............................... 8
Fault Finding Guide .... 12
Maintenance and
Extended Warranty ..... 13
The Heatslave
Guarantee ..................... 15
CONTENTS
2

GENERAL
INFORMATION
To ensure you get the very best from your new Worcester
Heatslave oil boiler, please read these notes and instructions care-
fully.
The Worcester Heatslave is a combination boiler which pro-
vides mains-fed domestic hot water and full central heating. It
utilises a Heatslave tank and a heat exchanger, which ensure that
whenever a tap is turned on there is an instantaneous output of
hot water.
The boilers control system gives priority to the domestic hot
water supply. This means that during hot water draw-off and
Heatslave tank recovery periods, the total output of the boiler is
directed to the Heatslave tank. If the central heating is switched on
during this period, the circulation of hot water to the radiators will
be temporarily interrupted but will resume as soon as the
Heatslave tank has been recharged to the temperature set on the
hot water control thermostat.
SERIAL NUMBER
Your boiler serial number and model number should always
be quoted in any contact with Worcester. This will help identify
spare parts and also avoid confusion and delays during any service
call-out. You will find these numbers on a label on top of the elec-
trical control box cover plate, and access can be gained by remov-
ing the top panel of the boiler casing.
FUEL
Your Worcester Heatslave pressure jet boiler is set to burn 28-
second kerosene fuel. Some models can be converted to burn 35-
second gas oil. If this conversion has been made your installer will
inform you.
PLEASE NOTE: Appliances fitted with a low-level discharge
flue MUST NOT be used with 35-second gas oil.
OPEN-FLUED BOILERS
Your installer will create airways (in walls or doors) to ensure
an adequate supply of fresh air to the boiler for combustion. Do
not block these airways, and never hang clothes or other com-
bustible materials over the boiler or against the flue pipe.
Never place anything on top of the boiler.
3

4
ROOM-SEALED BALANCED FLUE
BOILERS
Air for this type of boiler is supplied via the balanced flue ter-
minal, and no other air supply is required, except for ventilation if
the boiler is installed in a cupboard or compartment.
ELECTRICAL SUPPLY
The mains supply for your Heatslave boiler is 230/240 volts
AC-50Hz. The internal fuse is a 3- amp, 20mm quick-blow fuse.
ELECTRICAL CONNECTION
A mains cable should be connected to a double pole isolator
with a contact separation of 3 mm on all poles and supplying the
appliance and controls only.
Your boiler must be earthed and protected by a 5-amp fuse.
ROUTINE MAINTENANCE
It is essential that your boiler is installed and serviced by a
competent heating engineer, and Worcester will be pleased to
arrange regular servicing and a comprehensive maintenance con-
tract.
Alternatively, the Oil Firing Technical Association for the
petroleum industry (OFTEC) will gladly advise you of engineers
trained by and registered with OFTEC.
Servicing should be carried out at least once a year for boilers
which burn 28-second kerosene, and twice a year for boilers
which burn 35-second gas oil.
When considering additional controls or fittings for your new
Heatslave hot water and central heating system, please note the
following:
ROOM THERMOSTAT
It is recommended that a mains voltage room thermostat is
fitted, as this will improve your control of room temperatures.
THERMOSTATIC RADIATOR VALVES
Any thermostatic radiator valves fitted to your central heating
system must conform to BS 2767/10.
ADDITIONAL FITTINGS
& CONTROLS

5
SHOWERS, BIDETS, TAPS AND MIXERS
Any taps and mixers used with your system must be suitable
for operating at mains pressure.
For a shower it is recommended that you fit a thermostatical-
ly-controlled shower valve, as this will give added safety by pro-
tecting against excessive water temperatures.
Mains-fed hot and cold water can be supplied direct to an
over-rim flushing bidet, subject to local water bye laws.
If a loose shower head with a flexible hose is to be used over
the bath, the hose must be fixed so that the head cannot fall closer
than 25mm (1 inch) above the top edge of the bath, so preventing
its immersion in bath water. Alternatively, the shower must incor-
porate or be fitted with an anti-syphonage device at the point of
the flexible hose connections.
HOT AND COLD FLOW
The flow of water from your hot and cold taps depends on
the mains water pressure, and in some homes it might not be pos-
sible to operate several taps simultaneously. To ensure an even dis-
tribution of water to all outlets in the home, you can fit individual
flow regulators to the supply pipes.
USER OPERATING SWITCH
Your boiler facia panel is supplied with a user operating
switch as standard, although this may have been replaced with the
optional facia mounted electronic programmer or a remote pro-
grammer.
If ‘HOT WATER’ only is selected
The boiler will keep the Heatslave tank at the temperature set
on the hot water control thermostat.
Whenever a tap or shower is turned on, the burner will ignite
and water will be pumped through the water to water heat
exchanger to provide hot water.
YOUR HEATSLAVE
SYSTEM CONTROLS

6
If ‘HEATING’ and ‘HOT WATER’ are
selected together
The central heating will operate in response to any system
controls, and hot water will be supplied when a tap or shower is
turned on. The Heatslave tank will be kept at the pre-set tempera-
ture, as in the HOT WATER mode.
If ‘OFF’ is Selected
Your central heating and hot water will remain off unless
there is a demand via a frost thermostat (where fitted), in which
case the boiler pump, diverter valve and burner will be activated
until the demand is satisfied. The burner will remain inoperative
in all other circumstances.
If a demand for hot water is made at a tap or shower, primary
water will be pumped from the Heatslave tank through the hot
water heat exchanger. This will provide a limited supply of hot
water, the output depending on the amount of heat stored in the
Heatslave tank. This function could prove useful during periods
when it might be undesirable or uneconomical to keep the
Heatslave tank constantly hot, but when there might be a demand
for small quantities of hot water, such as for hand washing. Such
periods could include overnight and the summer months, when
the demand for hot water is lowest.
In these circumstances the Heatslave tank can be charged up
to maximum temperature once or twice a day as required, with the
programmer in the HOT WATER mode and the hot water control
thermostat set to maximum.
OPTIONAL PROGRAMMER
Where a Worcester facia mounted programmer has been fitted
to your appliance the additional “Heating” only setting is available.
Full installation and operation instructions are included with the
programmer kit.
If ‘HEATING’ only is selected
The boiler will operate as a conventional oil-fired boiler, giv-
ing output to the central heating circuit in response to the system
controls. A demand for hot water at a tap or shower will override
the central heating for as long as the hot water is drawn off, allow-
ing any residual heat in the Heatslave tank to be utilised.

7
The control knob has a range of adjustment as indi-
cated by the symbols.
Fig. 1.
TEMP
Low
Setting
High
Setting
EXTERNAL PROGRAMMER
You may opt to have a programmer sited away from the boil-
er, in which case your installer will provide setting and operating
instructions.
CENTRAL HEATING TEMPERATURE
CONTROL
The central heating temperature control knob on the boiler
facia panel enables you to control the temperature of the water in
your radiators. A low temperature is indicated by a single horizon-
tal bar, and the control knob can be set anywhere between this
and the maximum temperature, which is indicated by five hori-
zontal bars. (As shown in Fig. 1.)
PLEASE NOTE: The control knob must not be set below the
first indicating bar.
HOT WATER TEMPERATURE CONTROL
The hot water control temperature knob on the boiler facia
panel controls the temperature of the primary hot water stored in
the Heatslave tank. The temperature control settings are as for the
central heating control thermostat (described above). A high set-
ting will give higher hot water temperatures and greater quantities
of hot water.
The temperature of your hot water can also be controlled at
the tap by varying the flow rate; increasing the flow rate will
decrease the temperature, and vice versa.
WARNING. Care should be taken when washing your hands
as the combination of low water flow rate and a high setting of the
hot water control thermostat can result in very hot water at the
tap.

8
INDICATION LIGHTS
There are two indicator lights on the facia panel — POWER ON
and LOCKOUT.
The POWER ON light shows that there is an electrical power
supply to the electrical control panel. This will remain on at all times
provided there is an external electrical supply and the internal fuse
has not blown.
The LOCKOUT light illuminates if a burner ignition failure
occurs. The burner can be reset after two minutes by pressing the
illuminated lockout reset button located on the burner control box.
PLEASE NOTE: Do not attempt to repeatedly restart the boiler
as persistent lockout indicates a fault and you should consult a serv-
ice engineer.
OVERHEAT THERMOSTAT
Your boiler is fitted with a manual reset overheat thermostat. If
the burner fails to operate and the LOCKOUT indicator light is not
illuminated, check the overheat thermostat by pressing the reset but-
ton. The thermostat is located on the underside of the electrical panel
and is accessible by removing the boiler casing front panel. If the
problem continues after pressing the reset button, consult a service
engineer.
If your boiler is being operated for the very first time following
the installation your installer should have commissioned the system
as specified in the Installation Instructions.
HOW TO OPERATE YOUR
BOILER
Fig. 2. Control Facia
Domestic Hot Water Temperature
Control Knob
Overheat Thermostat
Reset Button
Lockout Indicator
Light
Central Heating Temperature
Control Knob
Mains Power Indicator
Light
Optional programmer
location

9
TO START YOUR BOILER
First ensure that the oil supply is turned on.
Now switch on the mains electricity and turn the hot water
and central heating temperature control knobs to maximum. Set
the user operating switch (or programmer) so that both HEATING
& HOT WATER ARE ON.
The burner should now ignite.
Set the user operating switch (or programmer) to suit your
own requirements, and if a room thermostat is fitted set the
desired temperature.
Similarly, set the hot water and central heating temperature
control knobs to the desired temperature level.
TO SWITCH YOUR BOILER OFF FOR
SHORT PERIODS
Set the programmer to OFF.
TO SWITCH YOUR BOILER OFF FOR
LONG PERIODS
Set the user operating switch (or programmer) to OFF and
switch off the mains electricity at the isolator switch. The facia-
mounted programmer (where fitted) will retain its settings for
about four weeks, after which it will revert to the factory-set pro-
gramme, but the display will disappear after approximately twelve
hours.
CENTRAL HEATING SYSTEM
OPERATION
During the first operation of the central heating system, check
that all radiators are heated evenly. If the top of a radiator is at a
lower temperature than the bottom, vent it by releasing air
through the vent screw at the top of each radiator. Your installer
should show you how to carry out this simple procedure, and give
you the special key required to do it.
Should you find any leaks in the system, or find that any radi-
ator requires excessive venting, ask the installer or a service engi-
neer to rectify the system.
SEALED SYSTEM OPERATION
If your boiler has been fitted to a sealed primary water sys-
tem, a minimum water operating pressure must be maintained.
This minimum pressure is indicated by the pre-set pointer located
on the pressure gauge, which can be viewed by removing the front
panel of the boiler casing.

10
If the pressure falls below this minimum level, the system
must be re-pressurised using the method described by your
installer.
To ensure that the boiler and system are full of water and
pressurised, check the pressure gauge indicator needle. Consult
your installer or service engineer if the system continues to lose
pressure, as this could indicate a leak.
MAINS SERVICE INTERRUPTIONS
In the event of mains water supply failure, no hot water will
be available from the boiler. However, the central heating system
will continue to operate.
If the electricity supply fails, the boiler will not operate. When
the supply is restored, the boiler will return to normal operation,
but you should check that the programmer has maintained your
required settings.
It is essential that your boiler is serviced by a competent engi-
neer, as previously described on page 4. These notes will also be
helpful in maintaining your boiler‘s efficiency and performance.
CLEANING
Use a damp cloth and a small amount of detergent to clean
the boiler casing. Never use abrasive cleaners.
FROST PRECAUTIONS
To protect your central heating system from freezing, your
installer may have fitted a mains voltage frost thermostat. If so,
your boiler should only be switched OFF at the user operating
switch (or programmer), otherwise the burner will not operate
when there is a demand via the frost thermostat.
If your boiler has not been fitted with a frost thermostat and
is not to be used during a long period of cold weather, the boiler
and the system should be drained to prevent freezing. If your boil-
er is not to be used during short periods of cold weather, leave it
on a low temperature setting.
LOOKING AFTER YOUR
BOILER AND SYSTEM