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P70, P72, and P170 Series
Controls for Low Pressure Applications
Description
The P70, P72, and P170 controls for low pressure
applications are designed primarily for low pressure cut-out control, pump-down
control, and capacity control on commercial refrigeration and air conditioning
applications.
These controls are available in several pressure ranges
and are compatible with most common refrigerants. They may also be used on
other non-corrosive fluid applications. Ammonia-compatible models are also
available.
Controls also are available in several different
electrical ratings and switch configurations. The P72 models provide
direct control of 208-240 colt single-phase motors up to 3 hp, and 208-220 volt
3-phase motors up to 5 horsepower.
Applications
NEMA 1 enclosures are standard on most models.
- P70A and P170A models with Single-Pole
Single-Throw (SPST) Open-low switch action are the most popular models and are
typically used for low pressure cut-out and pump-down control.
- P70 and P170 models are also available with
SPST Open-high switch action, and are typically used for capacity control.
Models with Single-Pole Double-Throw (SPDT) or 4-wire, 2-circuit switch action
allows users to install alarm devices or other circuits.
- P72 models have a Double-Pole Single-Throw (DPST)
switch with load-carrying contacts that can provide direct control of 208-240
V single-phase motors up to 3 hp. and 208-220V 3-phase motors up to 5 hp.
Refer to "DPST Electrical Ratings" in the chart below.
Features
- all-steel case and cover built to provide
long-lasting, rugged protection for internal components
- "Sight-Set" calibrated pressure adjustment displays a
visible pressure scale, fully adjustable throughout the range without removing
the cover (on NEMA 1 enclosure models)
- MICRO-SET™ differential option allows for precise
control on critical low pressure applications
- manual reset lockout option provides "trip-free" low
pressure lockout that cannot be overridden or reset until pressure returns to
specified level.
- limited knob adjustment option restricts control
adjustment ranges and deters tampering and over-adjustment.
Technical Specifications
Single Pressure Controls Switch Action, Low Event, High
Event, and Models
|
Switch and Action |
Low Event |
High Event |
Models |
|
Single-Pole Single-Throw (SPST) Open-Low |
Cut Out (Opens Line to M1) |
Cut In (Closes Line to M1) |
P70A, P70B, P170A |
|
Single-Pole Single-Throw (SPST) Open-high |
Cut In (Closes Line to M1) |
Cut Out (Opens Line to M1) |
P70C, P70D, P170C, P170D |
|
Single-Pole Double-Throw (SPDT) |
Opens 1 to 2 and closes 1 to 3 |
Closes 1 to 2 and Opens 1 to 3 |
P70E, P70F |
|
4-wire, 2-circuits, 1 N.O., 1 N.C., Open Low |
Cut Out (Opens M2 to Line and Closes M1 to Line) |
Cut In (Closes M2 to Line and Opens M1 to Line) |
P70G, P70H |
|
4-wire, 2-circuits, 1 N.O., 1 N.C., Open High |
Cut In (Closes M2 to Line and Opens M1 to Line) |
Cut Out (Opens M2 to Line and Closes M1 to Line) |
P70J, P70K, P170K |
|
Double-Pole Single-Throw (DPST) Open-low |
Cut Out (Opens M1 to Line and M2 to Line) |
Cut In (Closes M1 to Line and M2 to Line) |
P72A, P72B |
|
Double-Pole Single-Throw (DPST) Open-high |
Cut In (Closes M1 to Line and M2 to Line) |
Cut Out (Closes M1 to Line and M2 to Line) |
P72C, P72D |
SPST Electrical Ratings
P70A, B, C, and D and P170A, C, and D Models
|
|
Single-Phase Ratings |
|
|
Standard |
Hermetic Compressor |
|
|
120VAC |
208VAC |
240VAC |
208/240 VAC |
|
Motor Horsepower |
2 |
3 |
3 |
- |
|
Motor Full-Load Amps |
24 |
18.7 |
17 |
20 |
|
Motor Locked-Rotor Amps |
144 |
112.2 |
102 |
120 |
|
Non-Inductive Amps |
22 |
22 |
22 |
- |
|
Pilot Duty - 125VA at 120 to 600 VAC; 57.5 VA at 120 to
300 VDC |
SPDT Electrical Ratings 1hp Switch (P70E Models)
|
|
Standard Single-Phase Ratings |
|
|
Standard |
Hermetic Compressor |
|
|
120VAC |
208VAC |
240VAC |
277 VACa |
|
Motor Full-Load Amps |
16.0 |
9.2 |
8.0 |
7.0 |
|
Motor Locked-Rotor Amps |
96.0 |
55.2 |
48.0 |
42.0 |
|
Non-Inductive Amps |
16.0 |
9.2 |
8.0 |
- |
|
Pilot Duty |
125VA at 120 to 600 VAC |
125 VA at 24 to 600 VAC |
a. Rating for P70EC models only
SPDT Electrical Ratings 1/4 hp Switch (P70F Models)
|
|
Standard Single-Phase Ratings |
|
|
120VAC |
208VAC |
240VAC |
|
Motor Full-Load Amps |
6.0 |
3.3 |
3.0 |
|
Motor Locked-Rotor Amps |
36.0 |
19.8 |
18.0 |
|
Non-Inductive Amps |
6.0 |
6.0 |
6.0 |
|
Pilot Duty |
125VA at 24 to 240 VAC |
4-Wire, 2-circuit Electrical Ratings (P70G, H, J, and
K and P170K Models)
|
|
Standard Single-Phase Ratings |
|
|
Line-M2 (Main Contacts) |
Line-M1 (Auxiliary Contacts) |
|
|
120VAC |
208VAC |
240VAC |
277VAC |
120VAC |
208VAC |
240VAC |
277VAC |
|
Motor Full-Load Amps |
16.0 |
9.2 |
8.0 |
- |
6.0 |
3.3 |
3.0 |
- |
|
Motor Locked-Rotor Amps |
96.0 |
55.2 |
48.0 |
- |
36.0 |
19.8 |
18.0 |
- |
|
Non-Inductive Amps |
16.0 |
9.2 |
8.0 |
7.2 |
6.0 |
6.0 |
6.0 |
6.0 |
|
Pilot Duty for both sets of contacts |
125 VA at 24 to 600 VAC 57.5 VA at 120 to 300 VDC |
DPST Electrical Ratings (P72A, B, C and D Models)
|
|
Standard Ratings |
Hermetic Compressor Ratings |
|
|
120VAC, 1 |
208VAC, 1 |
240VAC, 1 |
208VAC, 3 |
220VAC, 3 |
208VAC,
1 |
240VAC,
1 |
|
Motor Horsepower |
2 |
3 |
3 |
5 |
5 |
- |
- |
|
Motor Full-Load Amps |
24 |
18.7 |
17 |
15.9 |
15 |
24 |
24 |
|
Motor Locked-Rotor Amps |
144 |
112.2 |
102 |
95.4 |
90 |
144 |
144 |
|
AC Non-Inductive Amps |
24 |
24 |
24 |
24 |
24 |
- |
- |
|
DC Non-Inductive Amps |
3 |
0.5 |
0.5 |
0.5 |
0.5 |
- |
- |
|
Pilot Duty |
125 VA at 120 to 600 VAC; 57.5 VA at 120 to 300 VDC |
Selection Chart
|
Code Number |
Switch Action |
Range psig (kPa) |
Differential psig (kPa) |
Pressure Connection |
Max Overpressure |
Max Working Pressure |
Limited Knob Adjustment |
|
MICRO-SET Controls (For Non-Corrosive Refrigerants) |
|
P70AB-12C |
SPST Open Low |
12 in. Hg to 80
(-41 to 551) |
Min 5(34) Max 35(241) |
36 in. Cap with 1/4 in. Flare Nut |
525 psig
(3617 kPa) |
80 psig
(551 kPa) |
Supplied, but not assembled |
|
P170AB-12C |
SPST Open Low |
12 in. Hg to 80
(-41 to 551) |
Min 5(34) Max 35(241) |
1/4 in. Male Flare Connector |
525 psig
(3617 kPa) |
80 psig
(551 kPa) |
None |
|
P70EA-14C |
SPDT 1 to 3 Open Low 1 to 2
Close Low |
12 in. Hg to 80
(-41 to 551) |
Min 5(34) Max 35(241) |
36 in. Cap with 1/4 in. Flare Nut |
525 psig
(3617 kPa) |
80 psig
(551 kPa) |
None |
|
P70EA-14C |
SPDT 1 to 3 Open Low 1 to 2
Close Low |
12 in. Hg to 80
(-41 to 551) |
Min 5(34) Max 35(241) |
1/4 in. Male Flare Connector |
525 psig
(3617 kPa) |
80 psig
(551 kPa) |
None |
|
ALL-RANGE Controls (For Non-Corrosive Refrigerants) |
|
P70AB-1C |
SPST Open Low |
20 in Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
1/4 in. Male Flare Connector |
325 psig
(2239 kPa) |
100 psig (690 kPa) |
Supplied, but not assembled |
|
P70AB-2C |
SPST Open Low |
20 in Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
36 in. Cap with 1/4 in. Flare Nut |
325 psig
(2239 kPa) |
100 psig (690 kPa) |
None |
|
P70BA-1C |
SPST Open Low |
20 in Hg to 100
(-68 to 690) |
Manual Reset Lockout |
36 in. Cap with 1/4 in. Flare Nut |
325 psig
(2239 kPa) |
100 psig (690 kPa) |
None |
|
P70BA-10C |
SPST Open Low |
20 in Hg to 100
(-68 to 690) |
Manual Reset Lockout |
1/4 in. Male Flare Connector |
325 psig
(2239 kPa) |
100 psig (690 kPa) |
None |
|
P70EA-10C |
SPDT
1 to 3 Open Low
1 to 2 Close Low |
20 in Hg to 100
(-68 to 690) |
5 (34) Fixed |
1/4 in. Male Flare Connector |
325 psig
(2239 kPa) |
100 psig (690 kPa) |
None |
|
P72AA-1C |
DPST Open Low |
20 in Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
36 in. Cap with 1/4 in. Flare Nut |
325 psig
(2239 kPa) |
100 psig (690 kPa) |
None |
|
P72AB-1C |
DPST Open Low |
20 in Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
36 in. Cap with 1/4 in. Flare Nut |
325 psig
(2239 kPa) |
100 psig (690 kPa) |
Mounted on Differential Screw |
|
P7170AB-2C |
SPST Open Low |
20 in Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
1/4 in. Male Flare Connector |
325 psig
(2239 kPa) |
100 psig (690 kPa) |
Mounted on Differential Screw |
|
P70CA-1C |
SPST Open High |
20 in Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
36 in. Cap with 1/4 in. Flare Nut |
325 psig
(2239 kPa) |
100 psig (690 kPa) |
None |
|
P170CA-1C |
SPST Open High |
20 in Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
1/4 in. Male Flare Connector |
325 psig
(2239 kPa) |
100 psig (690 kPa) |
None |
|
ALL-RANGE Controls (Ammonia Compatible) |
|
P70AA-5C |
SPST Open Low |
20 in Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
1/4 in. SS Female NPT |
325 psig
(2239 kPa) |
100 psig (690 kPa) |
None |
|
P70CA-4C |
SPST Open High |
|
P70GA-11C |
4 wire, 2-circuit Line M1 Close Low Line M2 Open Low |
Manual Reset Lockout |
|
P70HA-3C |
|
