Setting The Heating System Pressure; Checking Electrical Wiring - Bosch ZSB 30-2 Installation And Servicing Instructions

15.2.10 Setting the heating system pressure

NOTE: Risk of damaging the appliance.
B Only top up the heating system when the
appliance is cold.
Pressure gauge reading
1 bar Minimum system pressure (when
(100 kPa) cold)
1 - 2 bar Optimum system pressure
(100 - 200 kPa)
3 bar Maximum system pressure at
(300 kPa) highest heating water
temperature: must not be
exceeded (otherwise pressure
relief valve opens).
Table 24
B If the gauge is below 1 bar (100 kPa) (when the
system is cold), top up the system water between 1
and 2 bar (100 kPa and 200 kPa).
B If there is a pressure drop: check the expansion vessel
and heating system for leaks.

15.2.11 Checking electrical wiring

B Check electrical wiring for physical damage and
replace faulty leads.
Inspection/Servicing | 63
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