Danfoss KP 1 low pressure switch

The Danfoss KP 1 is a low pressure switch for refrigeration and air conditioning systems. It protects the compressor against excessively low suction pressure and can also start and stop it, for example in pump-down operation. 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 (060-111266 automatic, 060-111166 manual) and 6 mm ODF (060-111066 automatic, 060-110966 manual).

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 17 bar, test pressure 20 bar.
• Temperatures: ambient −25 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.
• Approvals: PED 2014/68/EU category IV (EN 12263) and UL.

Setting

Automatic version: set the cut-in pressure on the “CUT-IN” scale (one turn ≈ 0.7 bar), then the differential on the “DIFF” scale (one turn ≈ 0.15 bar). The cut-out pressure equals the cut-in pressure minus the differential; it must stay above absolute vacuum (−1 bar). Manual version: set the cut-out pressure; the reset button works once the pressure has risen by 0.7 bar. Always check the switching points with an accurate pressure gauge.

See also our Danfoss pressure switches KP 5 (high 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.