Danfoss Installation Guide: Pressure Switch KP 15, KP 15A, KP 17W, KP 17B, KP 17WB, KP 47WB

Refrigerants

Approved refrigerants include R22, R134a, R404A, R407A, R407C, R407F, R422B, R422D, R448A, R449A, R450A, R452A, R507A, R513A, R717*.

*only for KP 15A

For a complete list of approved refrigerants, visit: http://products.danfoss.com/all-products/

Ambient Temperatures / Mounting Requirements

• Min. ambient temperature for KP 15: -40 °C (-40 °F)
• Min. ambient temperature for KP 17, KP 47: -25 °C (-13 °F)
• Max. ambient temperature: 65 °C (149 °F)
• Relative humidity: 30 – 98%
• Vibrations resistance: 4 g (10 – 1000 Hz)

Test Pressure (Ptest)

Diagram illustrating LP (Low Pressure) and HP (High Pressure) with test pressure points.

• Ptest max. for KP 15, KP 17: 35 bar (510 psig) PS/MWP
• Ptest max. for KP 47: 20 bar (285 psig) or 24 bar (343 psig) PS/MWP

Regulation Range and Max. Working Pressure (PS/MWP)

Connections

Diagrams showing connection types for KP 15A, KP 15, and KP 17, including thread sizes (e.g., 7/16-20 UNF, G1/4 A, M10x0.75).

Maximum temperature for connections: 100 °C (212 °F).

Diagram showing 15% Ag brazing connection.

Mounting

Diagrams illustrating mounting options for enclosures.

• Option A: 8-32 UNC (M4)
• Option B: Enclosure IP30 (EN 60529)
• Option C: Enclosure IP44 (EN 60529)

Maximum depth for mounting screws: 3 mm (1/8 in).

Electrical Rating - General

Diagrams showing LP side (A-C opens on pressure drop) and HP side (A-C opens on pressure rise) with SPDT and LP/HP signals.

• AC-3: 16 A
• DC 13: 12 W
• AC-15: 10 A
• Max. 50 VA

Short circuit protection: Fuse 16 Amp.

When used acc. to UL regulations

Table detailing electrical ratings for UL compliance:

Use copper wire only. Tightening torque: 20 lb. in.

LP = Low Pressure

Diagrams illustrating LP settings for automatic and manual reset, showing Cut In, Differential, and Cut Out points.

HP = High Pressure

Diagram illustrating HP settings, showing Cut Out and Differential points.

Convertible reset

Information on convertible reset for KP 15, KP 17WB, KP 47WB.

Instructions: Insert a screwdriver into the slot on the lock disc and turn it to the desired reset configuration. Do not turn the screw on the lock disc as it may damage the convertible reset mechanism.

Manual trip function

Diagram showing manual trip function, emphasizing to use fingers only and not a screwdriver.

Adjustment

Diagrams showing adjustment ranges for LP and LP differential.

• LP: 0.7 bar (10 psi)/rev.
• LP diff.: 0.15 bar (2 psi)/rev.

Reset options

Table showing different reset options: LP manual, LP auto, HP manual, HP auto.

Note: Do not select automatic reset if system safety requires manual reset. Selected reset configuration may be protected against unauthorized actions by applying a seal.

CAUTION

Disconnect power supply before wiring connections or service to avoid electrical shock or equipment damage. Never touch live parts with fingers or tools.

Electrical rating

AC-3: 16 A / 250 V AC

AC-15: 10 A / 250 V AC

IMPORTANT NOTICE

Safety requirements

1. KP pressure switches shall only be employed in units/systems complying with charge limits and ignition source avoidance requirements of IEC 60335-2-24, IEC 60335-2-40, IEC 60335-2-89, ISO 5149, EN378-1 or equivalent.
2. Prevent overload on KPs. If damaged, stop the system/unit and replace the KP.
3. Implement electrostatic discharge and electrical leakage protection through grounding or other measures.
4. Only trained personnel authorized for flammable refrigerants systems may perform installation, maintenance, and switch exchange using appropriate tools.
5. Regularly check the function of the KP switch.
6. Install KP pressure switches in areas with a low risk of mechanical damage.
7. Consider corrosion protection for KP pressure switches in corrosive environments.
8. Ensure cables do not contact sharp edges. Connect cables with adequate stress relief to prevent pulling forces on terminals.
9. For systems with pressure pulsation, ensure these are effectively damped to prevent bellows failure. Keep KP switch cycle frequency as low as possible.
10. Do not install KP switches in areas with high vibration levels.

Disclaimer

The user is responsible for ensuring third parties comply with this Notice. All installation guides must be available with KP switches during installation. All conditions in this guide must be met and secured when using KP pressure switches.

Danfoss is not responsible for any direct, indirect, or consequential damage or loss, including loss of property, production, profit, or human injury arising from explosion or fire caused by flammable refrigerants.

Information provided, including product selection, application, use, design, weight, dimensions, capacity, or technical data, is informative and only binding if explicitly referenced in a quotation or order confirmation. Danfoss is not liable for errors in catalogues, brochures, or videos. Danfoss reserves the right to alter products without prior notice, provided form, fit, or function remain unchanged. All trademarks are property of Danfoss A/S or its group companies. Danfoss and the Danfoss logo are trademarks of Danfoss A/S. All rights reserved.