Pre-Service Check List - Worcester ZWBR 7-28 HE plus Installation And Servicing Instructions

9.1

Pre-Service Check List

1 Call up the last fault stored by the text-
display , (see page 31).
2 Check ionisation current, Service
Function 3.3, (see page 38).
3 Perform visual check of air/flue duct.
4 Check gas supply pressure
(see page 34).
5 Test combustion air/flue gas
(see page 35).
6 Check CO setting for min./
2
max. (gas/air ratio)
(see page 35).
7 Check gas and water systems for
leaks (see page 16).
8 Check hot water outlet temperature
(see page 38).
9 Check heat exchanger
(see page 38).
10 Check burner (see page 39).
11 Clean condensation trap
(see page 40).
12 Check charge pressure of
expansion vessel matches
static head of heating system.
13 Check central heating system
pressure.
14 Check electrical wiring for damage.
15 Check heating programmer settings in
the textdisplay
16 Check appliances that are part of
the heating system
Table 17
6 720 610 597 GB (01.07)
Date
mbar
min. %
max. %
mbar
mbar
mbar
Maintenance
37