Dhw Mode - Immergas ZEUS kW Export Technical Documentation Manual

Technical Documentation Technical Documentation
Electric circuit.

DHW mode.

Operation.
When the main switch (R10) is set to "SUMMER" or "WIN-
TER", DHW mode is enabled.
If the temperature felt by DHW NTC probe (B2) is less than
the temperature set on the control panel (or on the Remote
Control - when installed), the integrated P.C.B. powers the boiler
pump (M1) via K2 relay; and by switching the contacts on
K4 relay, it powers the motor (M) on the 3-way valve (M30),
which continues to run until limit switch "3" opens as DHW
position is reached.
Meanwhile, if flue pressure switch contacts (S6) are in "NC"
idle position, the adjustment circuit powers the fan (M20)
via K3 relay.
Once the go-ahead signal is received from the safety thermo-
stat (E4) and after the flue pressure swaps to "NO" (S6), the
integrated P.C.B. closes the K1 request relay which closes the
two contacts and allows ignition cycle to be started, actuat ing
the ignition electrodes (E1) and at the same time both gas
valve coils (Y1).
Integrated P.C.B. detects whether the burner has ignited via
the ionization electrode (E2).
STZkW ed 10/07 ZEUS kW Export
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