Supplied By www.heating spares.co Tel. 0161 620 6677
22
7
WIRING & FUNCTIONAL DIAGRAMS
7.1
ILLUSTRATED FLOW WIRING DIAGRAM
5VDC
5VDC
24VRAC
24VAC
24VRAC
240VAC
240VAC
240VAC
240VAC
240VAC
240VAC
24VDC
240VAC
NOTE:
– The room thermostat must be connected to the terminals 10-11 of the “TA” connector after
having removed the link.
– To remote control the boiler connect an external clock to the terminals 10-11 (24 V) of the
“TA” connector and set the built-in clock to “constant” mode (see user instructions for details).
Fig. 27
JUMPERS POSITION AND FEATURES
JUMPER
POSITION AND FEATURE
SUPPLY POSITION
CLOSED
OPEN
J7 - METANO/GPL
Ready to function with LPG
Ready to function with natural gas
Open
J8 - ANN. RIT.*
Ignition delay cancelled
Ignition delay operating
Open
*
In the heating phase, the electronic board is programmed to include a burner technical delay interval of approx. 3 minutes, which occurs both
at system cold starting and at subsequent re-ignitions. The aim is to overcome the problem of repeated ignitions and turning off with very short
time intervals between. This could occur in particular in systems presenting high head losses. At each restart after the period of slow ignition,
the boiler will set itself for about 1 minute at the minimum modulation pressure, and will then move to the heating pressure value set.
JUMPERS
