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Relay switch connection diagram – Swiftech H20KITS User Manual

Page 4

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St., Signal Hill, CA 90755

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4

5/ Electrical Installation

Find a suitable placement for the pump’s A/C
socket. Leave sufficient room under or above
the hole to install the pump relay switch circuit
board. A ¼” minimum clearance will be required
between the circuit board and the edge of the
hole.

Make a 1.25” (32mm) diameter hole in
the case, using a 1 ¼” Bi-Metal hole saw.
Deburr the edges of the hole with sand
paper.

Position and center the mounting plate
over the hole as a template to mark the
locations of the plate’s mounting screws.
Drill 2 holes of .125” diameter for the
mounting screws. Install the mounting
plate using the screws provided with your
kit.

Insert the A/C socket inside the mounting plate

Pump’s

relay switch

circuit board

A/C

Socket

1.

25

"

Ho

le

Sp

aci

ng

N\O

+

_

0.

25

"

Proceed with electrical connections as
described in the diagram to the right.

For normal operations, the L wire from the A/C
socket must be connected to the N/O (normally
opened) position of the switch. Normally Opened
means that when the computer is off, and there is
no current from the power supply going to the
switch, 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.

E

N

L

Ground +12v

Relay switch connection diagram

N\O

+

A/C Socket

Pump

Computer

Power Supply

Relay switch

US Europe
Black Brown

White Blue
Green Yellow

WARNING! Always disconnect
from A/C power source while

working with electrical devices.