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P28 Series
Lube Oil Pressure Cutout Control (With Time Delay)
Description
The P28 Series provides dependable shutdown on pressure
of lubricated refrigeration compressors by sensing low lube oil pressure.
A built-in time delay switch, accurately compensated for ambient temperature,
allows nuisance shutdowns on pressure drops of short duration during the running
cycle.
Applications
- semi-hermetic compressors
- P28 Control measures pressure available to circulate
oil through the lubrication system (Net oil pressure is the difference between
oil gauge and crankcase pressure.)
Features
- direct reading scale indication
- adjustable setpoint
- trip-free manual reset
- replacement timing relays available
- dust-protected switch
Accessories
- all models listed on this page include a universal
mounting bracket
- replacement timing relays
Technical Specifications
The maximum bellows pressure is 180 psig (2241 kPa).
Electrical Ratings - Pilot Duty
|
Time Delay Heater Circuit |
Pilot Circuit |
Alarm Circuit (must be same voltage as pilot circuit) |
P28DA-1 Contact Rating 2 to 1: 2 to 3 (must be same
voltage as time delay circuit) |
|
Crankcase Heater: Term 2 to 1 |
Runlight: Term 2 to 3 |
|
120/240 VAC |
750 VA, 120/240VAC |
125VA, 120/240 VAC |
10 amp 120VAC, 5 amp 240VAC |
10W |
|
24 VAC or VDC |
125 VA, 24 VAC 57.5 VA, 24VDC |
125 VA, 24 VAC 57.5 VA, 24VDC |
- |
10W |
Selection Chart
|
Code Number |
Time Delay |
Time Delay Heater Circuit VAC |
Type of Reset |
Range1
psig (kPa) |
Refrigerant (R) |
Pressure Connection |
|
P28AA-1C2 |
90 sec |
120/240 |
Manual |
8 to 70
(55 to 483) |
Non-Corrosive3 |
36 in. Cap with 1/4 in. Flare Nut |
|
P28AA-2C4 |
60 sec |
120/240 |
Manual |
8 to 70
(55 to 483) |
Non-Corrosive3 |
36 in. Cap with 1/4 in. Flare Nut |
|
P28AA-17C5 |
120 sec |
120/240 |
Manual |
8 to 70
(55 to 483) |
Non-Corrosive3 |
36 in. Cap with 1/4 in. Flare Nut |
|
P28AA-18C |
45sec |
120/240 |
Manual |
8 to 70
(55 to 483) |
Non-Corrosive3 |
36 in. Cap with 1/4 in. Flare Nut |
|
P28AN-1C |
90 sec |
120/240 |
Manual |
8 to 70
(55 to 483) |
Ammonia |
1/4 in. Female NPT |
|
P28DN-1C |
90 sec with runlight and alarm terminals |
120/240 |
Manual |
8 to 70
(55 to 483) |
Ammonia |
1/4 in. Female NPT |
|
P28DA-1C |
90 sec with runlight and alarm terminals |
120/240 |
Manual |
8 to 70
(55 to 483) |
Non-Corrosive3 |
36 in. Cap with 1/4 in. Flare Nut |
|
P28GA-2C |
90 sec |
120/240 |
Automatic |
8 to 70
(55 to 483) |
Non-Corrosive3 |
36 in. Cap with 1/4 in. Flare Nut |
|
P28NA-5C |
120 sec |
24 VAC or VDC |
Manual |
8 to 70
(55 to 483) |
Non-Corrosive3 |
36 in. Cap with 1/4 in. Flare Nut |
1. Switch
differential approximately 5 psi (34 kPa). Time delay relay energizes @ 9
psi (61 kPa) pressure difference, de-energized @ 14 psi (97kPa) difference.
2. Replaces Ranco P30-3701
3. Non-Corrosive refrigerants
include R-12, R-22, R-134A, R-500, R-502 (r)
4. Replaces Ranco P30-3601
5. Replaces Ranco P30-3801
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