Worcester 350 Combi User Manual

12. Instructions to the User
12.1 Instruct the user in the efficient and safe operation of the
appliance and hand over the User's Instructions pamphlet.
12.2 Describe the operation and function of the control s.
12 .3 Tell the user of the action necessary in the event of the cen-
tral heating system not being used during frost conditions.
12.4 Tell the user the sealed system pressure.
Fig . 26. Gas valve pressure adjustments.
1 2.5 Tell the user that it is important for servicing to be carried
out at th e intervals recommended by the Local Gas Re gion.
Worcester Heat Systems
Ltd . will be pleased to di scuss and offer
a comprehensive maintenance contract.
12.6 Se t the system controls to the user's requirements. Refer to
Section
11 .
12 .7 If an external programmer has been fitted which has a pro-
grammable domestic hot water facility then it is suggested that
this be set to Continuous or 24 Hours or the equivalent.
M aximum burner pressure adjuster
M odureg cap
Fig. 27. Central heating burner
pressure adjusting screw.
Cent ra l heating burner pressure a dju stmen t screw
PRESSURE ADJUSTMENT
CENTRAL HEATING
For outputs above
15 kW (51,200 Btu/hi
turn anticlockwise until
an unmodulated burner pressure
of 7.8 mbar is obtained
C on tr ol bo x rear casing
NOTE:
Turn the nuts clockwise
to incr ease and anticlockwise
to decrease the
burner pressur e.
----1--111------+- Suction pressure
compensating tube
r.:::~YH~--t--fft------j'--- Modu r eg head fixing screws (2)
~---+-- Inlet pressure test point
Fig. 28. Location of pipework connections and
adjusters.
19
L Pre ssure re l ief valve dr ain
'---- Central heat in g return
'-- --- - Central heating flow
'--------- Ma ins cold water in

Worcester 350 Combi Specifications

General

Brand	Worcester
Model	350 Combi
Category	Boiler
Language	English