Worcester 35CDi User Manual

Supplied By www.heating spares.co Tel. 0161 620 6677
27
MAIN SWITCH
ON
Green Light
On
Room
thermostat
and/or mains
programmer
(or link) On
AND
Electronic
facia
programmer
(if fitted) On
AND
ST13 link In
AND
CH control
knob On
CENTRAL
HEATING
DEMAND
CH light On.
Pump On.
Fan high
2 second then
Low Speed.
Ignition
Sequence.
Burner Light
on
Three minute
wait
Gas valve Off.
(CH light still
on. Pump still
On)
Over tempera-
ture shut-
down if flow
temperature
5°C above set
value
Two minute
minimum
burner
pressure then
ramp up
pressure over
next one
minute
Modulate gas
to maintain
flow
temperature
set by control
knob
DEMAND
END
Pump
continue four
minutes.
Fan continue
fifteen
seconds
CENTRAL HEATING FUNCTION
AND
AND
AND
17. Operational Flow Diagrams
DOMESTIC HOT WATER FUNCTION
MAIN SWITCH
ON
Green Light
On
Flow switch
On
(Tap open)
DOMESTIC
HOT WATER
DEMAND
(Priority over
CH demand)
HW light On.
Pump On.
Fan high
2 Seconds
then Low
Speed.
Ignition
Sequence.
Burner on
Four second
ramp to max.
gas pressure
Fan Speed
Change at
Approx mid
pressure
Modulate gas
to maintain
delivered
water
temperature
at value set by
control knob
Ten second
wait
Gas valve Off.
(HW light still
on. Pump still
On)
Over
temperature
shut-down if
water
temperature
8°C above set
value
Burner shut-
down if
primary
temperature
85°C
(until 74°C)
DEMAND
END
Fan continue
fifteen
seconds
Possible
overrun
condition
within next
four minutes
(See next
section)

Worcester 35CDi Specifications

General

Brand	Worcester
Model	35CDi
Category	Boiler
Language	English