Xylem HYDROVAR HV 4.150 / 4.185 / 4.220 - Manual (Page 31)

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9.4.3 Power unit
On the power unit two control terminal blocks can be found.
HV 2.015/2.022 HV 4.022 / 4.030 / 4.040
HV 4.055 / 4.075 / 4.110
HV 4.150 / 4.185 / 4.220
X7 Terminal for internal fan
X8 +24V
X1 Control terminals – power unit
PTC PTC or thermal switch
START/STOP (external release) when using a BASIC Inverter
SL SOLO RUN
SOLO RUN
START/STOP_PTC
X1
X7
X2
X8