Commissioning
51
Greenstar – 6721822579 (2021/01)
8.1 Before operating the appliance
NOTICE
Commissioning without being properly filled and purged will
damage the appliance.
▶ Only operate this appliance after ensuring there is sufficient water in
the boiler and the system.
▶ Adjust the expansion vessel pre-charge pressure to the static head of
the heating system ( page 31).
▶ Open radiator and zone valves (as applicable).
▶ Open heating supply and return valves, fill heating system to 14.5 to
21.75 psi (1 - 1.5 bar) and close fill valve.
▶ Bleed all air from the system.
▶ If the boiler water pressure has dropped, fill the heating system again
to 14.5 to 21.75 psi (1 to 1.5 bar).
▶ On ZBR...-3A appliances (heating boilers) with a DHW tank, open the
cold water supply and open a DHW tap until water runs out.
▶ Verify that the gas type specified on the rating plate is the same as the
gas type used.
▶Open the gas cock.
8.2 Switching the appliance ON/OFF
Startup
▶ Switch the appliance ON using the ON/OFF switch.
The display indicates the supply temperature of the hot water in °F. If
necessary, convert to °C ( page 60).
Fig. 63 Switching the appliance ON/OFF
When the appliance is switched ON for the first time, it performs a once-
only purging sequence. This involves the heating zone pump switching
on and off at intervals (for approx. 4 minutes).
The display shows in alternation with the supply temperature.
▶ Open the automatic vent [9] (only ZWB...-3A) and close it again
when the purging sequence has finished ( page 50).
If the display shows in alternation with the supply temperature, the
trap filling function is active ( page 59).
Shutdown
▶ Switch appliance OFF using the ON/OFF switch.
The display goes out.
▶ If the appliance is taken out of service for a longer period: Observe
frost protection ( Section 8.9).
8.3 Switch on heat
Set the maximum supply temperature based on the structure's heat loss
on design day.
Table 22 Typical supply temperatures
With radiant floor heating, limit the maximum permissible supply
temperature as recommended by the manufacturer.
▶ In order to set the maximum supply temperature, turn the supply
temperature dial knob.
Fig. 64 Switch on heat
If the burner is operating, the burner operation indicator lamp is
illuminated.
m
a
x
1
2
3
4
5
6
6 720 613 896-05.1O
Boiler high
limit dial
Typical supply
temperatures
Sample application
1 approx. 95 °F (35 °C) Frost protection
2 approx. 109 °F (43 °C)
3 approx. 122 °F (50 °C) Radiant floor heating system
4 approx. 140 °F (60 °C) Panel radiator system
5 approx. 153 °F (67 °C) Cast iron radiator system
6 approx. 167 °F (75 °C)
max approx. 187 °F (86 °C) Baseboard and convector
system
eco
reset
6 720 641 933-53.2O
max
1
2
3
4
5
6
max
1
2
3
4
e
6
min
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