Swiftech QPOWER - Manual (Page 8)

Swiftech Inc., 1703 E. 28 th St., Signal Hill, CA 90755 T. (562) 595-8009 F. (562) 595-8769 - 8 -
Pump Relay switch operations
For normal operations, the L wire from the A/C socket is
connected to the N/O (normally open) position of the switch. This
means that when the computer is off, there is no current from the
power supply to the switch, and the relay is opened, disallowing
A/C to the pump. Conversely, as soon as you turn the computer
on, the switch becomes energized by the power supply, and the
relay closes, allowing A/C current to pass to the pump.
For maintenance operations, if you want to turn the pump on
without operating the rest of the computer, you may temporarily
connect the L wire to the N\C (normally closed) position. This is
particularly useful for filling and bleeding the circuit, as you
wouldn’t want the computer running while the cooling circuit is
not completely operational. WARNING: do not forget to
reconnect to N\O once you are ready to run the computer: if
you leave the L wire connected to N\C, the pump will shut
off as soon as the relay is energized by the power supply.
N\
O
N\
C
+
_
E
N L
From Pump
Black
White
Green
Pump’s
Switch
CB
A/C
Socket
From Power Supply
+12v
Ground
Relay switch connection diagram