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INSTALLATION GUIDE

2. Position your PSU

2.1.

 Bottom of standard ATX cases

The fan control setting determines the optimal PSU placement.

In “Hybrid” mode 

Seasonic recommends to install your 
PSU with the ventilation top cover 
facing UPWARD, towards the direction 
of the motherboard. This will ensure 
natural heat dissipation.

In “Normal” mode

Although the direction of mounting 
is optional, it is not recommended to 
install the PSU with the ventilation 
top cover facing downward if there 
are no ventilation holes on the 
bottom of the case. 

WARNING! - IMPORTANT SAFETY INFORMATION

• NEVER, under any circumstances, open the power supply 

(PSU) due to high voltage inside. WARRANTY IS VOID once 
the cover is removed.

• DO NOT insert any object into the fan grill or the ventilation 

area.

• DO NOT place any object in front of the fan or the 

ventilation area that may obstruct or restrict airflow.

• USE ONLY the Seasonic modular cables provided in the 

packaging box.

• KEEP the PSU in a dry environment, away from humidity.
• The power supply is to be integrated into a computer 

system and not intended for external or outdoor usage.

Declaration of Conformity

This device complies with Part 15 of the FCC Rules. 
Operation is subject to the following two conditions: 
(1) this device may not cause harmful interference, and 
(2) this device must accept any interference received, 
including interference that may cause undesired operation.
Product: Switching Power Supply
Model name: Please refer to the rating label on the product.
Contact: www.seasonic.com/contact-us

Power Supply Tester

10-pin Connector 
18-pin Connector

1. Test the Seasonic CONNECT before installation 

1.1. 

Attach the Seasonic CONNECT 

to the PSU.

1.2.

 Plug the AC power cord into the 

PSU. Make sure that the AC power is 
coming directly from the wall outlet. 

It is recommended to use a high quality 

surge protector to protect the PSU and 

the system.

1.3.

 Set the fan control of the power 

supply to Normal Mode.

In Hybrid or Fanless Mode (S

3

FC) the fan 

will not turn.

1. Test the Seasonic CONNECT before installation 

2.2.

 The Seasonic CONNECT cannot be used when the PSU is installed on the top 

side of the case.

Q5 Series

1.4.

 Connect both the 18-pin and 

the 10-pin connectors of the 
motherboard cable to the Seasonic 
CONNECT.

1.5.

 Attach the Power Supply 

Tester to the 24-pin motherboard 
connector. There is a notch on the 
Tester that fits directly into the 
notch on the 24-pin connector.

1.6.

 Turn on the power supply by 

setting the I/O switch to the “I” (ON) 
position.

If the power supply fan starts 
spinning, and the LED light on the 
Seasonic CONNECT is lit, then 
your PSU is working.

BUMWHFA2-BW

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