QHT RIVA FP Service Instructions Manual page 31

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Third Part (edition-0106) Control p.c.b. 11.62
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12 Thermal Control
Switch in the function mode
Circulator off
Request for heat from
Operates motorised valve
NO
room thermostat?
Ignition device not fed
YES
Starts the circulator
After 25 second circulator
Primary circuit flow off and faulty primary cir
NO
switch OK? cuit (see LED table)
YES
Is primary circuit
YES
temperature higher than that
selected?
NO
Operates motorised valve
Supplies the ignition device
RIVA FP SERVICE MANUAL – REV A 5-6