Worcester 350 Combi User Manual

w
N
End of Domestic Hot
water Demand.
Operating SWitcl! and
room thermostat on .
Central heating
demand .
{Overides fan overrun
mode ).
Frost Thermostat on.
16. Operational Flow Diagrams
Note. The alpha references in these charts are to be used fot cross -refere ncing when fau lt fi nding. See Section 1 7.
Fan off .
II
Operatin g Swill:h O FF .
Gas valve o ff .
Primary water
temperature monitored
by central heating
sensot
m
Burner pressure
1.3 mbar for two
min utes.
Full fan above
4.5 mbar burner
pressure . Low fan
below 4 .5 mbar
burner pre ssure.
Burner pressure
increases to se t level
over one minute .
II
13
Central he ating
temperature 5°C
ab ove se t level
Hea t input modu lated
to maintain water
temperature.
Se t by T emperature
Co ntro l Knob.
~
Central heating
Demand
satisfied.
1. Central Heating Mode.
AUTOMATIC START-UP SEQUENCE
,.~~ -~-~ID::-u==ll
1:1
r--m
I "- · ... L ...... . ~-~-- I
test PASS ......., "'· ..... roM M~. Fan to low speed. Sense air pressure .
FAIL I NOT PRESENT
-
Wail I
I
Reset by switclting H
I
- ?l
Stop spark .
(A pp ropri a te pump on)
Operating Switch
Volatile lockout
I {Appropria te p ump
Gas valve off
(A p propria te pum p
OFF -oN .
and fan at low spe ed
a nd fan at l ow speed
rem ain on.)
remain on.)
Gas valve off .
1-l --tl~•~ l Central h~ting pump
Fan off or fan overrun
Hrequired.

Worcester 350 Combi Specifications

General

Brand	Worcester
Model	350 Combi
Category	Boiler
Language	English