Danfoss Electronics MP Catalog Page
MP - Dierential Pressure Switch / Lube Oil Protection Switch
MP 54 and MP 55 oil dierential pressure switches are used to protect refrigeration compressors against low oil pressure. These switches are
compatible with HCFC and non-ammable HFC refrigerants.
Features
MP
Connection to suction side of
refrigeration plant, LP
Simple manual trip
Universal mounting hole patterns
Electrical test function that
eliminates the need for
tools and test jumper wires
Connection to pressure side
of lubrication system, OIL
Facts
Applications:
• Commercial refrigeration
• Commercial air conditioning
• Supermarket Refrigeration
• Food processing and storage
Electrical connection at
the front of the unit
Reliable stainless steel bellows
• Product Types
- Fixed Dierential (MP 54)
- Adjustable Dierential (MP 55)
• Refrigerants: HCFC and non-ammable HFC refrigerants
• Max working/test pressure: 245 psig/320 psig
• Ambient temperature: The time relay is temperature-compensated in the range −40 °F to +140 °F
• Enclosure: ~NEMA 1
• Cable entry: Integral ½ inch female NPSM swivel cable connector for ½ inch male pipe thread connector.
• Pressure connection: ¼ inch M are or 36 inch capillary tube with ¼ inch are nut
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Quick Select Guide
Technical data and ordering
MP - Dierential Pressure Control / Lube Oil Protection Control
Danfoss
Typ e
MP54
MP55
1
With glow lamp that remains on during normal operation of compressor.
Note: When time delay is energized which also means that min. permissible oil pressure (dierential Δp) is reached, light goes out.
2
Three-wire hook-up with jumper that is provided in the box with control.
3
The 3321 series controls feature adjustable delay and xed dierential. The dierential for 3321-014 controls is set at 15 psig and 3321-015 is at 30 psig.
Control
dierential Δp
(psig)
6 29 to 175 45 P145NCA/B-82C 060B200866
9 29 to 175 90 3321-001 060B200266
9 29 to 175 120
4.3 to 65 29 to 175 45
4.3 to 65 29 to 175 60 P128AA-2C 060B201266
4.3 to 65 29 to 175 120 P128AA-17C 060B200766
LP side
Regulation
range
(in. Hg/psig)
Time relay
delay time
seconds
Competitor
Code Nos.
¼ in. M are
P145NCA/B-12C
P31-5827
3321-001
Select control with appropriate delay time.
Danfoss
Code No.
060B200366
Competitor
Code Nos.
36 in. capillary tubes
with ¼ in. are nuts
P45NCA-82C
3321-009
2
1
P45NCA-12C
P30-5826
3321-010
P288AA-18/2C
P30-3601
3321-014/5
P28AA-17C
P28NA-5C
P30-3801
3321-014/5
3
3
Danfoss
Code No.
060B205066
060B205366
060B205466
060B205766
2
Spare Parts and Accessories
Description Type(s) applied to Danfoss Code No.
Capillary tube;
39 in. with ¼ in. are coupling nuts on each end
MP with ¼ in. M are 060-017166
Quick Select Guide
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