Ordering information - PENN Controls - LIT-12012399 - P77AAA - P77BCA - P77BEA - P78LCA - P78MCA - Electromechanical Pressure Control - P77 Single Pressure Control - P78 Dual Pressure Control

P77 and P78 Series Controls for Single and Dual Pressure Applications Product Bulletin
Brand
PENN Controls
Product name
P77 Single Pressure Control
P78 Dual Pressure Control
Document type
Product Bulletin
Document number
LIT-12012399
Revision date
2020-10-28
Language
English

P77 and P78 Series Pressure Controls are available in a variety of standard and non-standard models. Table 1 is a type identification matrix that itemizes all the potential P77 and P78 Series Control types. Table 2, Table 3, and Table 4 are model selection charts that list the features on standard single and dual pressure control models available through most Johnson Controls or PENN authorized distributors.

Figure 1 illustrates the Style 45 connection available on P77 and P78 control models. Contact your Johnson Controls or PENN representative for availability and price.

Table 1. Identification matrix for P77 and P78 Series Pressure Controls
Type number Description
P77AAA Single pressure; automatic reset
P77BCA Low pressure; manual reset
P77BEA High pressure; manual reset
P78LCA Dual pressure; automatic reset
P78MCA Dual pressure; high-side manual reset
Table 2. Standard P77 models for low pressure applications for non-corrosive refrigerants
Model number Individual pack Bulkpack Pressure connection Switch action Range bar (psi) Differential bar (psi) Maximum bellows pressure bar (psi)
P77AAA -13000C -13000D 7/16-20 UNF 6 mm (1/4 in.) flare fitting SPDT -0.5 to 7

(7 to 102)

 0.6 to 3

(9 to 44)

 20 (290)
-15000C -15000D 914 mm (36 in.) capillary with 6 mm (1/4 in.) flare fitting
P77BCA -13000C — 7/16-20 UNF6 mm (1/4 in.) flare fitting Manual reset
-15000C — 914 mm (36 in.) capillary with 6 mm (1/4 in.) flare fitting
Note: Manual reset: The control cannot be reset until the pressure rises 0.5 bar (7 psi) or greater above the low cut-out point.
Table 3. Standard P77 Models for High Pressure Applications (For Non-Corrosive Refrigerants)
Model Number Individual Pack Bulkpack Pressure Connection Switch Action Rangebar (psi) Differential bar (psi) Maximum Bellows Pressure bar (psi)
P77AAA -13500C -13500D 7/16-20 UNF 6 mm (1/4 in.) flare fitting SPDT 3 to 30

(44 to 435)

 3 to 12

(44 to 174)

 33 (479)
-15500C -15500D 914 mm (36 in.) capillary with 6 mm (1/4 in.) flare fitting
P77BEA -13500C -13500D 7/16-20 UNF 6 mm (1/4 in.) flare fitting Manual reset
-15500C -15500D 914 mm (36 in.) capillary with 6 mm (1/4 in.) flare fitting
Note: Manual reset: The control cannot be reset until the pressure reduces 3 bar (44 psi) or lower below the high cut-out point.
Table 4. Standard P78 Dual Pressure Controls for non-corrosive refrigerants
Model number Individual pack Bulkpack Pressure connection Low pressure side bar (psi) High pressure side bar (psi) Maximum bellows pressure

psi (bar)
Range Diff. Range Diff.
P78LCA -13000C -13000D 7/16-20 UNF for 6 mm (1/4 in.) flare fitting -0.5 to 7

(7 to 102)

 0.6 to 3

(9 to 44)

 3 to 30

(44 to 435)

 3 fixed

(44)

 LP: 20 (290)

HP: 33 (479)
-15000C -15000D 914 mm (36 in.) capillary with 6 mm (1/4 in.) flare fitting
P78MCA -13000C -13000D 7/16-20 UNF for 6 mm (1/4 in.) flare fitting Manual reset
-15000D -15000D 914 mm (36 in.) capillary with 6 mm (1/4 in.) flare fitting
Note: Manual reset: The control cannot be reset until the pressure reduces 3 bar (44 psi) below the cut-out point.
Figure 1. Capillary connector dimensions, mm (in.)