Worcester 350 Combi User Manual

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Operating Switch ON
and taponn
Hot water
Demand .
(OVerides any poin t in
central h eating or f an
overrun mod es) .
Si gnal
fromfto w
switch
Hot water pum p on .
m
Wait for hot water
temperature to fall
below set leveL
(Hot wate r pump
remains o n) .
-----~- ---1 Gas valve remains on.
YES
Is the central h eating
mod e in terrup t ed ?
NO'----_.
Pulse oentral heating
m
Auto m ati c start
up sequence
Do m estic hot wate r
t empe ra ture
mo nitored by hot
wa ter sensor .
SEE DETAILED SEQUEN CE ON PREVIOUS P AGE
13
m
Hot water
t emperature rises
s•c above setting .
Operating Switch OFF .
ffi
~
Hot W ater
De mand
sati s fi ed .
D
Hot water
pump off .
Fan off .
Return to provide
ce ntral hea ting
follo wing 2 112 minute
delay .
Fan overrun operates
if ce ntral heating is
satisfied.
m
Demand
indicator
illuminated
p ump lor two secnnds ~----_.
during high fan pulse
m
2. Domes ti c Ho t W ater Mo d e.
3. Fan Overrun Function.
m
Central h eating and
domestic ho t water
pumps off and primary
water temperature
abo ve 7S °C.
I
m
Full speed fan un til the
primary temperature
tans to 6 s•c .
4. Overheat
Protection.
Gas to Water heat
exchanger excess
temperature causes
boiler overh e at
th ermostat to trip .
5. Low System
Press u re Pro t ection .
Water pressure switch
detects low central
heating system
f3
pressure
I
A pp liance shuts down .
- ---
6. Domestic Ho t W ater O ver hea t Prot ectio n.
Domestic ho t water
Domestic hot wa ter
delivery te mperature
1---
overhea t the rmostat
too hig h.
causesiH valve to
shut o . Hot water
I
p ump and fan remain
on w hile water flows
from tap and applianc e
may lockou t

Worcester 350 Combi Specifications

General

Brand	Worcester
Model	350 Combi
Category	Boiler
Language	English