Danfoss Electronics MP 54, MP 55 Data Sheet

Data sheet

Differential pressure switch / Lube oil protection control

MP 54 and MP 55

MP 54 and MP 55 oil dierential pressure switches are used as safety switches to protect refrigeration compressors against low lubricating oil pressure.

If the oil pressure fails, the switch will stop the compressor after a predetermined time period has elapsed.

MP 54 and MP 55 are used in refrigerating systems using HCFC and non-ammable HFC refrigerants.

MP 54 has a xed dierential pressure setting. It also incorporates a thermal time relay with a xed release time setting.

MP 55 have adjustable dierential pressure and are available with thermal time relay.

Features

Approvals

• Fixed and adjustable dierentials available

• Extremely narrow switch dierential accuracy

• Reliable, long life stainless steel bellows

• Sturdy metal cover and universal mounting hole patterns

• Integral ½ NPSM swivel cable connector allows direct attachment of ½ in. male pipe thread connector

UL listed for USA and Canada, le E31024

• Simple manual trip, electrical test function eliminates need of tools and test “jumper” wires

• Standard four-wire hook-up

• Can be used for HCFC and non-ammable HFC refrigerants

Data sheet | Dierential pressure switch / Lube oil protection control, MP 54 and MP 55

Materials in contact with the medium

Technical data

Unit type Material

MP 54 MP 55

MP with capillary tube

Ambient temperature

Stainless steel 19/11, no. 1.4306 to EN 10088 Deep-drawn steel plate, no. 1.0338 to EN 10130 Free cutting steel, no. 1.0718 to EN 10277

Copper Cu-DHP, no. CW024A acc. to EN 12450

The time relay is temperature-compensated in the range - 40 – 140 °F

Switch dierential Maximum 2.8 psi

Maximum working pressure MWP = 245 psig

Maximum test pressure Pe = 320 psig

Control voltage 240 or 120 V AC or DC

Permissible voltage variation -15 – 10%

Contact load of time relay output contacts M-S

240 V AC: 2 FLA

240 V DC: 0.2 FLA

Electrical connection NPSM

Max. bellows temperature

Cable entry

212 °F

Integral ½ in. female NPSM swiwel cable connector allows direct attachment of ½ in. male pipe thread connector.

Ordering

Enclosure ~NEMA 1

For R22, R134a, R404A, R407A, R407C, R407F, R422B, R422D, R448A, R449A, R450A, R452A, R507A, R513A

For complete list of approved refrigerants, visit www.products.danfoss.com and search for individual code numbers, where refrigerants are listed as part of technical data.

Connection

Code no.

¼ in are nut

with 36 in

capillary tube

¼in are nut

with 88 in

capillary tube

–

Typ e

Control

dierential

∆p

Regulation

range

LP side

[psi] [inHg] – [psi] [s]

6.0 29 inHg – 175 psi 45 060B200866 – –

6.0 29 inHg – 175 psi 45 – 060B205066 –

MP 54

9.0 29 inHg – 175 psi 90 060B200266 – –

9.0 29 inHg – 175 psi 120 060B200366 2) – –

9.0 29 inHg – 175 psi 120 – 060B205366 2)

4.3 – 65 29 inHg – 175 psi 45 – 060B205466 –

4.3 – 65 29 inHg – 175 psi 60 060B201266 1) – –

MP 55

4.3 – 65 29 inHg – 175 psi 90 060B200666 – –

4.3 – 65 29 inHg – 175 psi 120 060B200766 – –

4.3 – 65 29 inHg – 175 psi 120 – 060B205766 –

) With glow lamp that remains on during normal

operation of compressor.

) Three-wire hook-up

Time relay delay time

¼ in are

Note:

When time delay is energized which also means that min. permisible oil pressure (dierential ∆p) is reached, light goes out.

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