Turning On And Off - Fer FERSYSTEM TECH 31 C Instructions For Use, Installation And Maintenance

Domestic Hot Water mode
The Domestic Hot Water heat demand (generated by the DHW flow sensor or due to a Comfort request)
is indicated by the flashing of the Hot Water symbol under the tap (part. 8 and 9 – fig. 1). The display
indicates the actual Domestic Hot Water temperature (part. 11 – fig. 1) and during domestic hot water
off time the text "d1".

1.3 Turning ON and OFF

Without main power supply
To avoid damage caused by freezing during long shutdowns in winter, it is advisable to drain all
water from the system.
Ignition
Ensure the power is on to the appliance.
fig. 5 Ignition
• For the firsts 120 seconds, the display shows FH that identifies the Air purge function.
• During the first 5 seconds, the display shows the software version of the pcb.
• Open the gas cock on the boiler and purge the air from the pipework upstream of the gas valve.
• When the FH disappears, the boiler is ready to function automatically whenever the external controls
6
FERSYSTEM TECH 31 C
eco/comfort
reset
fig. 4 - Boiler without main power supply
eco/comfort
reset
Cod. 3540U320 - 09/2009 (Rev. 00)
fig. 3
eco/comfort
reset
eco/comfort
reset
eco/comfort
reset
fig. 6 Air purge