Telco Envirotrols Inc.

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P45 Series

Lube Oil Pressure Cutout Control (With Time Delay)

Description

The P45 control provides dependable, low lube oil pressure protection for refrigeration compressors.  The factory set pressure setting provides operation to the compressor manufacturer's specification.  A built-in time delay relay, compensated for ambient temperature, allows for pressure pick-up on start and avoids nuisance shutdowns on short duration pressure losses during the running cycle.

Applications

The P45 control is a semi-hermetic compressor that measures net oil pressure available to circulate oil through the lubrication system.  (Net oil pressure is the difference between oil pump pressure and the crank case pressure).

Features

  • universal mounting
  • trip-free manual reset
  • ambient compensated time delay

Accessories

These controls are supplied without mounting brackets.  If brackets are required, order kit number BKT38A-600R, which contains five 271-51 angle mounting brackets with screws.

Technical Specifications

For all non-corrosive refrigerants

Electrical Ratings - Pilot Duty

Time Delay Heat Circuit Pilot Duty
120/240 VAC 750 VA, 120/240 VAC
24 VAC 125VA, 24 VAC

Selection Chart

Code Number Time Delay Heater Circuit VAC Type of Reset Maximum Bellows Pressure, psig (kPa) Factory setting, psid (kPa) Fixed Pressure Connection
Copeland Compressors
P45NAA-5C 120 sec 24 Manual 425 (2390) 9 (62)2 36 in. Cap with 1/4 in. Flare Nut
P45NAA-10C 90 sec 24 Manual 425 (2390) 9 (62)2 48 in. Cap with 1/4 in. Flare Nut
P45NCA-12C2 120 sec 120/240 Manual 425 (2390) 9 (62)2 36 in. Cap with 1/4 in. Flare Nut
P145NCA-12C4 120 sec 120/240 Manual 425 (2390) 9 (62)2 1/4 in. Male Flare (Style 5)
P145NCB-12C4 120 sec 120/240 Manual 425 (2390) 9 (62)2 1/4 in. Male Flare (Style 5)
Carlyle Compressors
P45NCA-82C6 45 sec 120/240 Manual 425 (2390) 6.5 (45)2 36 in. Cap with 1/4 in. Flare Nut
P145NCA-82C8 45 sec 120/240 Manual 425 (2390) 6.5 (45)2 1/4 in. Male Flare (Style 5)
P145NCB-82C9 45 sec 120/240 Manual 425 (2390) 6.5 (62)2 1/4 in. Male Flare (Style 5)

1.   Relay is not field replacable

2.    Switch differential is approximately 5 psi (34 kPa).  Time Delay relay energizes at 9 psi (61 kPa) pressure difference, de-energizes at 14 psi (97 kPa) difference.

3.    Replaces Ranco P30-5826

4.    Replaces Ranco P30-5827

5.    Repalces Ranco P30-5827 (includes alarm wire)

6.    Replaces Carlyle/Carrier Part No.HKCA-500, 6342050

7.    Switch differential is approximately 4.5 psi (34 kPa).  Time Delay relay energizes at 6.5 psi (45 kPa) pressure difference, de-energizes at 11 psi (76 kPa) difference.

8.    Replaces Carlyle/Carrier Part No. HKCA-500, 6342050 with 36" SEC99A UltraCap

9.    Replaces Carlyle/Carrier Part No. HKCA-500, 6342050 with 36" SEC99A UltraCap (Includes Alarm Wire)

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Last modified: 05/07/08