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8 716 102 692c 10/05
134
Hot Water Mode:
The appliance operates to supply only domestic hot water when
the heating temperature mode is fully anti-clockwise, at the position
or the timer is programmed to OFF mode.
A flow restrictor is fitted within the appliance which limits a hot
water delivery rate to a maximum of:
24CDi 9.0 (±15%) litres/minute
28CDi 10.0 (±15%) litres/minute
35CDi II 12.0 (±15%) litres/minute
Hot Water and Central Heating mode:
When a demand is made for
heating by the system controls
(i.e. a programmer or room
thermostat), the pump will
energise, circulating primary
water around the heating
system and the burner will
light. The heat output from
the appliance in this mode has
been factory set to maximum.
The appliance will operate as
necessary to maintain the
temperature of the radiators
at the level set by the
adjustment of the Heating
Temperature Control Knob.
(See Fig. 2.)
If the system no longer
requires output to maintain
the desired room temperature,
the burner will extinguish.
The pump will continue to
run for a short period to
dissipate the residual heat
from the appliance and then
switch off.
The appliance will supply
heat to the central heating
system as required. A demand
for hot water at a tap or
shower will override the
central heating function for
the period of the domestic hot
water demand.
GUARANTEE
REGISTRATION
You should complete and return the postpaid Guarantee
Registration Card within 30 days of purchase.
The card will register you as the owner of your new
Worcester CDi appliance and, while this will not affect your
statutory rights in any way, it will assist us to maintain an
effective and efficient customer service by establishing a
reference and permanent record for your boiler.
IMPORTANT: SERIAL NUMBER. Copy the number off the
Guarantee Card.
FOR YOUR OWN RECORD
MODEL
SERIAL NUMBER
(See identity label inside appliance casing)
TYPE/SIZE DATE OF INSTALLATION
MAINTAINING YOUR
APPLIANCE
Your new Worcester CDi gas-fired appliance represents a
long-term investment in a reliable, high quality product.
In order to realise its maximum working life, and to ensure
it continues to operate at peak efficiency and performance, it is
essential that your boiler receives regular, competent servicing
and annual maintenance checks beyond the initial 12 month
guarantee period.
Regular service contracts can be arranged with your installer
– however if you have difficulty making a satisfactory
arrangement simply contact Worcester on 01905 754624 for
help.
Fig. 1. System Diagram.
Automatic air
vent
Gas to water
heat
exchanger
Circulating
pump
Water to
water heat
exchanger
Diverter valve
CH
flow
Domestic
hot water
out
Domestic
cold
supply
CH
return
Safety
discharge
Pressure
relief valve
Boiler
Expansion
vessel
24CDi, 28CDi & 35CDi II
COMBI
USER INSTRUCTIONS &
CUSTOMER CARE GUIDE
G.C. NUMBERS
APPLIANCE NATURAL GAS L.P.G.
24CDi Fanned Flued (RSF) 47 311 30 47 311 31
24CDi Balanced Flued (BF) 47 311 29
24CDi Open Flued (OF) 47 311 32 47 311 33
28CDi Fanned Flue (RSF) 47 311 34 47 311 35
35CDi II Fanned Flue (RSF) 47 311 58 47 311 59
CORGI CONTACT
All CORGI Registered installers carry a CORGI ID card and
have a registration number. Both should be recorded in your
central heating log book. You can check your installer is
CORGI Registered by calling CORGI on 01256 372300
Worcester, Bosch Group, Cotswold Way, Warndon, Worcester WR4 9SW.
Telephone: 01905 754624 Fax: 01905 753130.
Technical Helpline 08705 266241.
Worcester, Bosch Group is a trading name of BBT Thermotechnology UK Limited
www.worcester-bosch.co.uk
Vote for your
‘Installer of the year’ at
www.worcester-bosch.co.uk
Worcester supports the
Benchmark code of practice
16


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