Commissioning | 59
6 720 643 068 (2011/06)Copyright (optional information)
7.1 Before operating the appliance
B Adjust the expansion vessel pre-charge pressure to the
static head of the heating system (Æ page 37).
B Open radiator and zone valves (as applicable).
B Open heating supply and return valves, fill heating
system to 14.5 to 21.75 psi (1 - 1.5 bar) and close fill
valve.
B Bleed all air from the system.
B If the boiler water pressure has dropped, fill the heating
system again to 14.5 to 21.75 psi (1 to 1.5 bar).
B On ZBR..-3A appliances (heating boilers) with a DHW
tank, open the cold water supply and open a DHW tap
until water runs out.
B Verify that the gas type specified on the rating plate is
the same as the gas type used.
B Open the gas cock.
7.2 Switching the appliance ON/OFF
Startup
B 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 (Æ Service
function 0.E: Metric or US customary units, page 73)
Fig. 54 Switching the appliance ON/OFF
B Open the automatic vent [9] (only combi boiler
ZWB..-3A) and close it again when the purging sequence
has finished (Æ page 58).
Shutdown
B Switch appliance OFF using the ON/OFF switch.
The display goes out.
B If the appliance is taken out of service for a longer
period: Observe frost protection (Æ Section 7.9).
NOTICE: Commissioning without being
properly filled and purged will damage the
appliance.
B Only operate this appliance after ensuring
there is sufficient water in the boiler and
the system.
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.
If the display shows in alternation with the
supply temperature, the trap filling function is
active (Æ page 70).
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6 720 613 896-05.1O
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