English
Installation and operating instructions Wilo-SC/SCe-HVAC
83
CAUTION! Risk of property damage!
Risk of damage due to incorrect connection.
• Do not connect any external voltage to the terminals!
Analogue input for remote setpoint
adjustment/manual control mode
Using the corresponding terminals in accordance with the wiring dia-
gram, remote adjustment of the setpoint or manual control mode is
possible by means of an analogue signal (4...20 mA).
• Use a shielded cable, connect the shield at one end in the switchbox.
Setpoint changeover
Using the corresponding terminals in accordance with the wiring dia-
gram, it is possible to force a changeover from setpoint 1 to setpoint
2 by means of a potential-free contact (normally open contact).
CAUTION! Risk of property damage!
Risk of damage due to incorrect connection.
• Do not connect any external voltage to the terminals!
External activation/deactivation
Using the corresponding terminals in accordance with the wiring dia-
gram, it is possible to connect a remote activation/deactivation by
means of a potential-free contact (normally closed contact) after
removing the jumper (factory-fitted).
CAUTION! Risk of property damage!
Risk of damage due to incorrect connection.
• Do not connect any external voltage to the terminals!
Frost protection (not for
Δ
p-c)
Using the corresponding terminals (in accordance with the wiring
diagram), it is possible to connect a frost monitor by means of a
potential-free contact (normally closed contact).
CAUTION! Risk of property damage!
Risk of damage due to incorrect connection.
• Do not connect any external voltage to the terminals!
Protection against low water level
(only for
Δ
p-c)
Using the corresponding terminals (in accordance with the wiring dia-
gram), it is possible to connect a function for protection against low
water level by means of a potential-free contact (normally closed
contact) after removing the jumper (factory-fitted).
External activation/deactivation
Closed contact:
Automatic ON
Open contact:
Automatic OFF
Signal by symbol on the display
Tab. 7 – External on/off logic plan
Frost protection
Closed contact:
No frost protection
Open contact:
Frost alarm
Frost protection function is acti-
vated
Tab. 8 – Frost protection logic plan
Protection against low water level
Closed contact:
No low water
Open contact:
Low water
Tab. 9 – Logic plan for protection against low water level
Summary of Contents for SC-HVAC SC
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