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P74 Series
Differential Pressure Control
Description
Series P74 measures the pressure difference between two
sources: supply lines and return lines. A change in differential pressure
will reposition the switching mechanism to cause corrective action of the
supplementary control equipment.
Applications
- differential pressure sensing on chillers or
water-cooled condensers
- lube oil failure cutout for refrigeration compressors
(same as the P28, but does not incorporate time delay)
- positioning M100 Series motor-actuated valves
(P74JA-2)
Features
- field-proven Pennswitch with a completely enclosed
contact mechanism
- pressure differential setting is easily changed
without removing the cover
- trip-free manual reset
- ambient compensated time delay
Accessories
All models on this page include a universal mounting
bracket.
Electrical Ratings - Pilot Duty
|
Motor Ratings |
120 V |
208 V |
240 V |
277 V |
|
P74AA, P74BA - 1 Phase |
|
AC Full Load Amp |
20.0 |
18.7 |
17.0 |
- |
|
AC Locked Rotor Amp |
120.0 |
112.2 |
102.0 |
- |
|
AC Non-Inductive Amp |
22.0 |
22.0 |
22.0 |
- |
|
Pilot Duty |
125 VA, 120 to 600 VAC; 57.5 VA, 120 to 300 VDC |
|
P74EA |
|
AC Full Load Amp |
16.0 |
9.2 |
8.0 |
- |
|
AC Locked Rotor Amp |
96.0 |
55.2 |
48.0 |
- |
|
AC Non-Inductive Amp |
16.0 |
16.0 |
16.0 |
16.0 |
|
Pilot Duty |
125 VA, 120 to 600 VAC |
|
P74FA |
|
AC Full Load Amp |
6.0 |
3.4 |
3.0 |
- |
|
AC Locked Rotor Amp |
36.0 |
20.4 |
18.0 |
- |
|
AC Non-Inductive Amp |
10.0 |
10.0 |
10.0 |
10.0 |
|
Pilot Duty |
125 VA, 120 to 277 VAC |
|
P74JA |
|
1 amp 24 VAC Class 2; 50/60 Hz |
Selection Chart
|
Code Number |
Switch Action |
Range Pressure Differential psi (kPa)1 |
Switch Differential |
Pressure Connections |
Bellows Material |
|
For all Non-Corrosive Liquids |
|
P74AA-1C |
SPST Closed on decrease in pressure difference |
8 to 70 Adjustable
(55 to 483) |
8 to 30 Adjustable |
36 in. cap with 1/4
in. Flare Nut |
Stainless Steel |
|
P74BA-1C |
SPST Opens on decrease in pressure difference |
8 to 70 Adjustable
(55 to 483) |
8 to 30 Adjustable |
36 in. cap with 1/4
in. Flare Nut |
Stainless Steel |
|
P74EA-8C |
SPDT (snap-acting) |
2 to 26 Adjustable (14 to
207) |
3.5 Fixed |
36 in. cap with 1/4
in. Flare Nut |
Brass |
|
P74EA-10C |
SPDT (snap-acting) |
2 to 26 Adjustable (14 to
207) |
3.5 Fixed |
1/4 in. Male
Flare |
Brass |
|
P74FA-1C |
SPDT (snap-acting) |
8 to 60 Adjustable (55 to
414) |
1.5 Fixed |
1/4 in. Male
Flare |
Brass |
|
P74FA-5C |
SPDT (snap-acting) |
8 to 60 Adjustable (55 to
414) |
1.5 Fixed |
1/4 in. FNPT |
Brass |
|
P74FA-10C |
SPDT (snap-acting) |
2 to 26 Adjustable (14 to
207) |
1.5 Fixed |
36 in. cap with 1/4
in. Flare Nut |
Brass |
|
P74JA-2C |
SPDT (Floating) |
8 to 60 Adjustable (55 to
414) |
2.5 Fixed |
1/4 in. Male
Flare |
Brass |
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