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P70, P72, and P170 Series
Controls for Dual Pressure Applications
Description
The P70, P72, and P170 controls for dual pressure
applications are designed primarily for use as combination high and low pressure
controls on commercial refrigeration and air conditioning applications.
These controls are available in several pressure ranges and are
compatible with most common refrigerants. Ammonia-compatible models are also
available.
These controls respond directly to system pressure
changes on both high and low sides, and can provide single-device control of the
compressor.
Controls are available in several different electrical
ratings and switch configurations, including independent high and low pressure
switches (on P70S and P170S models). The P72 models provide direct control
of 208-240 volt, single-phase motors up to 3 horsepower, and 208-220 volt,
3-phase motors up to 5 horsepower.
Applications
NEMA 1 enclosures are standard on most models.
NEMA3R enclosures are also available. Some models available with
limited knob adjustment, which restricts adjustment of the pressure settings and
deters over-adjustment or tempering.
- P70S and P170S models have independently
operated high and low pressure Single-Pole Double-Throw (SPDT) switches that
can be wired to satisfy a variety of control requirements. These
adaptable controls also come with a high pressure manual reset lockout
mechanism that may be converted to automatic reset.
- P70L, M, N, and P170L, M, N models have a
Single-Pole Single-Throw (SPST) switch. Models are available with
automatic or manual reset lockout options. Models with manual reset are
available with either high-side-only manual reset, or low-side and
high-side manual reset. Ammonia-compatible models are also available
(P70L and P70M only).
- 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
- independent high and low pressure switches (P70S and
P170S Models) satisfies a variety of dual pressure application wiring
requirements with a single versatile control
- convertible high pressure reset-auto reset or manual
reset lockout (P70S and P170S Models) reduces inventory - one controls can be
adapted to several dual pressure applications in the field.
Maximum Pressures
|
Pressure |
Low Side |
High Side |
|
All Range |
MICRO-SET |
|
Maximum Working Pressure |
100 psig (552kPa) |
80 psig (690kPa) |
500 psig (3447 kPa) |
|
Maximum Overpressure |
325 psig (2241 kPa) |
525 psig (3620 kPa) |
525 psig (3620 kPa) |
DPST Electrical Ratings (P72L, M, and N Types)
|
|
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 |
SPST Electrical Ratings
P70L, M, and N and P170L, M, and N Types)
|
|
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 |
24 |
|
Motor Locked-Rotor Amps |
144 |
112.2 |
102 |
144 |
|
Non-Inductive Amps |
22 |
22 |
22 |
- |
|
Pilot Duty - 125VA at 120 VAC; 720 VA at 120 to 277 VAC |
4-Wire, 2-circuit Electrical Ratings (P70P, Q, and R
Types)
|
|
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 |
Selection Chart
|
Code Number |
Switch Action |
Low Pressure Side psig (kPa) |
High Pressure Side psig (kPa) |
Pressure Connector |
Limited Knob Adjustment |
|
Range |
Differential |
Range |
Differential |
|
MICRO-SET Controls (For Non-Corrosive Refrigerants) |
|
P70LB-6Ca |
SPST |
12 in. Hg to 80
(-41 to 551) |
Min 5(34) Max 35(241) |
100 to 500
(690 to 3447) |
Fixed Approx. 65 (448) |
36 in. Cap with 1/4 in. Flare Nut |
Low CUT OUT |
|
P70MA-18Ca |
SPST |
12 in. Hg to 80
(-41 to 551) |
Min 5(34) Max 35(241) |
100 to 500
(690 to 3447) |
Lockout requires manual reset |
36 in. Cap with 1/4 in. Flare Nut |
None |
|
P70SA-18Ca |
Two independent SPDT |
12 in. Hg to 80
(-41 to 551) |
Min 5(34) Max 35(241) |
100 to 500
(690 to 3447) |
Fixed at 65 (448) or Lockout requires manual reset |
36 in. Cap with 1/4 in. Flare Nut |
None |
|
P170LB-6Ca |
SPST |
12 in. Hg to 80
(-41 to 551) |
Min 5(34) Max 35(241) |
100 to 500
(690 to 3447) |
Fixed Approx. 65 (448) |
1/4 in. Male Flare Connector |
Low CUT OUT |
|
P170MA-18Ca |
SPST |
12 in. Hg to 80
(-41 to 551) |
Min 5(34) Max 35(241) |
100 to 500
(690 to 3447) |
Lockout requires manual reset |
1/4 in. Male Flare Connector |
None |
|
P170SA-1Ca |
Two Independent SPDT |
12 in. Hg to 80
(-41 to 551) |
Min 5(34) Max 35(241) |
100 to 500
(690 to 3447) |
Fixed at 65 (448) or Lockout requires manual reset |
1/4 in. Male Flare Connector |
None |
|
All Range Controls for Non-Corrosive Refrigerants |
|
P70LB-1Ca |
SPST |
20 in. Hg to 100
(-68 to 690) |
Min 6(41) Max 50(345) |
100 to 500
(690 to 3447) |
Fixed Approx. 65 (448) |
36 in. Cap with 1/4 in. Flare Nut |
Low CUT OUT |
|
P70MA-1Ca |
SPST |
20 in. Hg to 100
(-68 to 690) |
Min 6(41) Max 50(345) |
100 to 500
(690 to 3447) |
Lockout Requires Manual Reset |
36 in. Cap with 1/4 in. Flare Nut |
None |
|
P70NA-1C |
SPST |
20 in. Hg to 100
(-68 to 690) |
Fixed (Manual Reset) |
100 to 500
(690 to 3447) |
Lockout Requires Manual Reset |
36 in. Cap with 1/4 in. Flare Nut |
None |
|
P72LA-1Ca |
DPST |
20 in. Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
100 to 500
(690 to 3447) |
Fixed Approx. 65 (448) |
36 in. Cap with 1/4 in. Flare Nut |
None |
|
P72LB-1Ca |
DPST |
20 in. Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
100 to 500
(690 to 3447) |
Fixed Approx. 65 (448) |
36 in. Cap with 1/4 in. Flare Nut |
Low CUT OUT |
|
P72MA-1Ca |
DPST |
20 in. Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
100 to 500
(690 to 3447) |
Lockout Requires Manual Reset |
36 in. Cap with 1/4 in. Flare Nut |
None |
|
P72NA-1Ca |
DPST |
20 in. Hg to 100
(-68 to 690) |
Fixed (Manual Reset) |
100 to 500
(690 to 3447) |
Lockout Requires Manual Reset |
36 in. Cap with 1/4 in. Flare Nut |
None |
|
P170LB-1Ca |
SPST |
20 in. Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
100 to 500
(690 to 3447) |
Fixed Approx. 65 (448) |
1/4 in. Male Flare Connector |
Low CUT OUT |
|
P170MA-1Ca |
SPST |
20 in. Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
100 to 500
(690 to 3447) |
Lockout Requires Manual Reset |
1/4 in. Male Flare Connector |
None |
|
P170NA-1Ca |
SPST |
20 in. Hg to 100
(-68 to 690) |
Fixed (Manual Reset) |
100 to 500
(690 to 3447) |
Lockout Requires Manual Reset |
1/4 in. Male Flare Connector |
None |
|
All Range Ammonia Compatible Controls |
|
P70LA-2Ca |
SPST |
20 in. Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
100 to 500
(690 to 3447) |
Fixed Approx. 65 (448) |
1/4 in. Male Flare Connector |
None |
|
P70MA-2Ca |
SPST |
20 in. Hg to 100
(-68 to 690) |
Min 7(48) Max 50(345) |
100 to 500
(690 to 3447) |
Lockout Requires Manual Reset |
1/4 in. Male Flare Connector |
None |
a. Control models with high
pressure side (only) that are UL Listed as Refrigeration Limiting Controls.
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