Danfoss KP 15 dual pressure switch (LP/HP)

The Danfoss KP 15 combines a low pressure switch and a high pressure switch in one housing. It protects the compressor against both excessively low suction pressure and excessively high discharge pressure, with a single unit to wire. Its changeover contact controls the compressor, and a signal contact indicates a low pressure fault.

The four versions

HP side, all versions: range 8 to 32 bar, fixed 4 bar differential. Gauge pressures. 1/4″ (6 mm) male flare connections, DIN 8906. Only the automatic version comes with its top cover (IP44). On request: 060-124166 with 1/4″ ODF solder connections (060-125466), versions with separate LP and HP signals (060-126566 automatic, 060-126466 HP 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: LP side, maximum working pressure 17 bar and test pressure 20 bar; HP side, 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 15 is not intended for R410A or CO2 (R744). It is not PED-approved as a safety device (EN 12263): the certified version is the KP 17, with double bellows on the HP side.
• Weight: about 0.5 kg.

Setting

LP side (automatic reset): set the cut-in pressure on the “CUT-IN” scale (one turn ≈ 0.7 bar) and the differential on “DIFF” (one turn ≈ 0.15 bar). HP side: set the cut-out pressure on “CUT-OUT” (one turn ≈ 2.3 bar); the compressor restarts, or manual reset becomes possible, once the pressure has fallen by 4 bar. Always check the switching points with an accurate pressure gauge.

See also our Danfoss pressure switches KP 1 (low pressure), KP 5 (high pressure) 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.