5.7.2 Control of the expansion valves
The output of the opening degree for controlling the two electronic expansion valves of zone 1 and zone 2 is
provided at the factory via the pulsing (PWM - pulse width modulation) of the two semiconductor relays EEV1
and EEV2 and the two analogue outputs AO1 and AO2 (only UA 410 E AC).
UA 400 E CC / UA 410 E AC
UA 401 E CC
UA 400 E CC / UA 410 E AC
Single-zone operation Single-zone operation
Two-zone operation
Standalone operation
EEV1
on terminals 23/24
EEV1 and EEV2
on terminals 23/24 and 33/34
For details, see Terminal assignment of the 230 V AC relay outputs.
Pulsed electronic expansion valves
The parameter "Freigaberel. (menu 6-3) must be configured to "OFF" (factory setting) so that the
semiconductor relays output the opening degree in a timed way:
For details, see chapter Terminal assignment of the 230 V AC relay outputs.
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