Danfoss KP 5 high pressure switch

The Danfoss KP 5 is a high pressure switch for refrigeration and air conditioning systems. It stops the compressor when the discharge pressure gets too high, and is also used to start and stop the fans of an air-cooled condenser. Its bounce-free snap-action contact keeps an accurate cut-out point and resists vibration.

The two versions

Gauge pressures. 1/4″ (6 mm) male flare connection, DIN 8906. The automatic version comes with its top cover (IP44). On request: solder versions 1/4″ ODF (060-117966 automatic, 060-118066 manual) and 6 mm ODF (060-117766 automatic).

Common specifications

• Contact: snap-action single-pole double-throw (SPDT), AC1 16 A, AC3 16 A and AC15 10 A at 400 V; DC13 12 W at 220 V. It can switch a single-phase motor of up to about 2 kW directly.
• Pressures: maximum working pressure and test pressure 35 bar.
• Temperatures: ambient −40 to 65 °C (80 °C for 2 h max.); media −50 to 100 °C.
• Refrigerants: R22, R134a, R404A, R407A, R407C, R407F, R422B, R422D, R448A, R449A, R450A, R452A, R507A and R513A, as well as the A2L refrigerants R454C, R455A, R1234yf and R1234ze with the precautions set out by Danfoss.
• Wiring: cable entry for 6 to 14 mm cable (Pg 13.5 possible), 0.75 to 2.5 mm² wires.
• Tool-free test: a manual trip lever lets you operate the contact by hand to check the wiring.
• Good to know: the KP 5 is not intended for R410A or CO2 (R744). It is not PED-approved as a safety device (EN 12263): for a certified pressure limiter, Danfoss offers the KP 7 and KP 17 with double bellows.

Setting

Automatic version: set the cut-out pressure on the “CUT-OUT” scale (one turn ≈ 2.3 bar), then the differential on the “DIFF” scale (one turn ≈ 0.3 bar). The compressor restarts when the pressure has fallen to the cut-out pressure minus the differential. Manual version: set the cut-out pressure; the reset button works once the pressure has fallen by 3 bar. Always check the switching points with an accurate pressure gauge.

See also our Danfoss pressure switches KP 1 (low pressure), KP 15 (dual LP/HP) and MP 55 (oil differential).

Afric Froid, your Danfoss supplier

Afric Froid supplies Danfoss pressure switches and thermostats, installs them and provides after-sales service in Tunisia, Algeria, Senegal and Ivory Coast. Tell us the refrigerant and pressures of your system: we will choose the right model and send you a quote.