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Worcester
Boiler
35CDi II
Worcester 35CDi II User Manual
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29
18. Oper
ational Flo
w Diagrams
MAIN SWIT
CH
ON
Green Light
On
R
oom
thermostat
and/or mains
progr
ammer
(or link) On
AND
Electronic
facia
progr
ammer
(if fitted) On
AND
ST13 link in
AND
CH control
knob On
CENTRAL
HEA
TING
DEMAND
CH light On.
Pump On.
Fan ON High f
or 2
sec then Low speed -
28CDi.
Fan ON High f
or 2
sec then Low speed -
35CDi
II
.
Ignition Sequence.
Burner Light On.
Three minute
wait
Gas valv
e Off.
(CH light still
on. Pump still
On)
Ov
er tempera-
ture shut-
down if flow
temperatur
e
5°C abo
ve set
value
T
w
o minute mini-
mum burner
(30 seconds -
35CDi
II
)
pr
essur
e then
ramp up
pressur
e ov
er
next one minute
Modulate gas
to maint
ain
flow
temperatur
e
set b
y control
knob
DEMAND
END
Pump
continue four
minutes.
Fan continue
fifteen
seconds
CENTRAL HEA
TING FUNCTION
AND
AND
AND
DO
MESTIC HO
T W
A
TER FUNCTION
MAIN SWIT
CH
ON
Green Light
On
Flow switch
On
(T
ap open)
DOMESTIC
HO
T W
A
TER
DEMAND
(Priority o
ver
CH demand)
HW light On.
Pump On.
Fan ON High speed -
28CDi.
Fan ON High f
or 2
sec then Low speed
- 35CDi
II
.
Ignition Sequence.
Burner on
F
our second
ramp t
o max.
gas pressur
e.
Fan speed
changes at mid
pressur
e
35CDi
I
I
.
M
odulate gas
to maint
ain
deliv
ered
water
temperatur
e
at value set b
y
control knob
T
en second
wait
Gas valv
e Off.
(HW light still
on. Pump still
On)
Ov
er
temperatur
e
shut-down if
water
temperatur
e
8°C abo
ve set
value
Burner shut-
down if
primary
temperatur
e
94°C
(until 84°C)
DEMAND
END
Fan continue
fifteen
seconds
P
ossible
o
verrun
condition
within next
four minutes
(See next
section)
28
30
Table of Contents
Servicing Instructions
1
Table of Contents
2
Installation Regulations
2
General Information
2
Technical Data
4
Required Clearances
6
Siting the Appliance
6
Siting the Flue Terminal
7
Air Supply
7
Sealed Primary Systems
8
Gas Supply
8
Open Vent Primary Systems
9
Domestic Hot Water
9
Electrical Connections
10
Electrical
10
Installation
13
Commissioning
17
Instructions to the User
19
Inspection and Servicing
20
Replacement of Parts
21
Short Parts List
27
Operational Flow Diagrams
29
Fault Finding
31
Conversion Instructions
39
5
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Worcester 35CDi II Specifications
General
Model
35CDi II
Output
35kW
Mounting
Wall-mounted
Max. DHW Output
35kW
Efficiency Rating
A
ErP Heating
A
ErP Water
A
Warranty
5 years
Fuel Type
Natural Gas
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