Suctioning - Viessmann PLC VITOCAL 350-HT PRO Service Instructions For Contractors

Operating conditions and actuator tests

Suctioning

Launch with
■ "Menu"
■ "Suctioning"
Fig. 27
The following information is displayed:
"Suct. switching act." "Y"/"N"
■
"Suction pr. (1.2 bar = 0 °C)"
■
Desired suction pressure
(cont.)
Buttons:
"Suctioning"
■
The function is activated:
The low pressure application limits are no longer
observed.
The activation commands for all cylinder charging
operations are deactivated.
The desired suction pressure can be entered.
Tapping on the "Suctioning" button switches on a
compressor and suctioning is performed up to the
desired suction pressure.
The electronic expansion valve (EEV) opens so that
the line from the refrigerant collector to the EEV can
be emptied.
If the function is deactivated by pressing the button
again, a low pressure alarm is triggered.
If the alarm is acknowledged, the EEV opens briefly
until the temperature is within the application limits.
Diagnosis
41