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Danfoss

How to adjust a KPU dual pressure switch

  • Friday, November 22, 2019

For KPU pressure switch installation, see the article on the subject. This article may be used in conjunction with our video on the subject.

 

Disclaimer:
All actual service work must be performed by a qualified licensed refrigeration service technician equipped with the appropriate tools and test instruments.

 

1. Monitor adjustments using pressure gauges
Be sure to attach pressure gauges before making any pressure adjustments to the system and monitor changes after each adjustment is made.

2. Loosen locking screws
Each adjustment is guarded by a locking screw, which must be loosened before adjustments can be made.

3. Adjust low side setpoint
To make adjustments to your low side, use a screwdriver to turn the spindle clockwise to lower the value and counterclockwise to raise the value.

4. Adjust the low side differential
To make adjustments to your differential, turn the spindle clockwise to raise the value and counterclockwise to lower the value.

5. Adjust high side setpoint
To make adjustments to the high side setpoint, turn the spindle clockwise to raise the value.

6. Tighten the locking screws
After your adjustments are complete, retighten each locking screw to prevent unwanted tampering.

7. Adjust the reset function
Using a screwdriver to make adjustments to the reset function of the switch, insert the screwdriver into the eye of the lobe.

NOTE: The screwdriver must be placed in the eye of the lobe as the brass screw is not designed to be adjusted directly and may break under direct pressure.

The switch comes packaged in position 1, which provides manual reset for both the low and high pressure sides of the switch.

Moving the lobe to position 2 provides an automatic reset on the low-pressure side while retaining the manual reset on the high pressure side.

Position 3 provides an automatic reset on both the low and high pressure sides.

Position 4 provides a manual reset on the low-pressure side and an automatic reset on the high pressure side.

With this final adjustment made, your KPU pressure switch is now ready for use.