Penn Controls Cross Reference (Temperature, Pressure & Refrigeration Controls)
Penn controls have been switching compressors, fans, and refrigeration circuits since before Johnson Controls acquired the brand — which means the A19 temperature controls, P70-family pressure controls, and their relatives exist in decades of part-number generations, most of them long out of catalog. Johnson Controls maintains an official cross-reference from the legacy numbers to current Penn production, and the full tables are below.
The structure to know before you use them: Penn part numbers encode the family (A19, P70, P29), the switch action, and the range/differential in the suffix — and the cross-reference maps at the full catalog number level, because two controls sharing a family prefix can carry different ranges, capillary lengths, and electrical ratings. When the tables show a current replacement, check the range and differential columns against your nameplate rather than stopping at the family match; a handful of legacy ranges consolidated into broader current ranges, and the notes flag where a field adjustment is expected at commissioning.
Controls with style or bulb-and-capillary variants that never made the official cross can usually still be matched functionally — that’s a spec exercise, not a table lookup, and we do it daily. Send the full number off the control body plus the application (medium, range, switch load) and we’ll confirm.
A19s, P70s, and the common refrigeration controls are stock items; discontinued originals we source. Quote below or call 1-800-755-2883.
Table of Contents
- → 1. Replacing Legacy Penn & Johnson Controls
- → 2. Penn A19 / A11 / A28 Temperature Controls Cross Reference
- → 3. Penn P70 / P72 / P100 Pressure Controls Cross Reference
- → 4. Penn P29 / P45 Lube Oil Protection & Refrigeration Controls
- → 5. Source Reference Documents & Resources
- → 6. Source Your Penn Controls From TCI Supply
1. Replacing Legacy Penn & Johnson Controls
Navigating Penn control replacements requires evaluating both the electrical rating and the mechanical sensing element. Legacy electromechanical switches with liquid-filled or vapor-charged bulb-and-capillary elements must be matched to capillary length, bulb dimensions, and temperature range. Similarly, pressure controls require verification of bellows materials (e.g., standard vs. stainless steel for corrosive refrigerants or ammonia service) and high/low cut-in/cut-out pressure settings.
2. Penn A19 / A11 / A28 Temperature Controls Cross Reference
| Legacy Penn Model | Range & Differential | Current Replacement | Notes & Sensing Element |
|---|---|---|---|
| A19AAT-1 | -30 to 100°F (3 to 12°F diff) | A19ABC-24C | SPDT switch action. 6 ft capillary length with standard coiled bulb. |
| A19ABC-1 | 30 to 110°F (3.5°F fixed diff) | A19ABC-24C | Standard NEMA 1 enclosure replacement for general space/pipe sensing. |
| A19AEC-1 | -30 to 50°F (5°F fixed diff) | A19AEC-1C | Freeze protection / defrost limit application. |
| A19B3C-1 / A19BCC | 0 to 150°F (NEMA 4) | A19PRC-1C / A19BCC-1C | NEMA 4 / Washdown enclosure requirement. Verify liquid tight fitting. |
3. Penn P70 / P72 / P100 Pressure Controls Cross Reference
| Legacy Penn Model | Pressure Range & Differential | Current Replacement | Notes & Bellows Material |
|---|---|---|---|
| P70AA-118 | 0 to 80 psi (5 to 20 psi diff) | P70AA-118C | Low pressure cutout for standard non-corrosive refrigerants (R-22, R-134a, R-404A). |
| P70CA-1 | 100 to 500 psi (40 to 150 psi diff) | P70CA-1C | High pressure safety cutout with SPST open-on-high switch action. |
| P72AA-1 | Dual Pressure (Low/High) | P70NA-1C / P72AA-1C | Combined low and high pressure controls on single chassis. Independent bellows. |
| P100 Series (Direct Mount) | Direct-mount encapsulate | P100AP / P100CP Series | Encapsulated fixed setpoint pressure switch for OEM applications. |
4. Penn P29 / P45 Lube Oil Protection & Refrigeration Controls
| Legacy Penn Model | Differential / Time Delay | Current Replacement | Notes & Reset Features |
|---|---|---|---|
| P29NC-1 | 8 to 60 psi / 120 sec delay | P29NC-1C | Lube oil differential pressure switch. Built-in thermal time delay heater + manual reset button. |
| P45NCA-12 | 8 to 60 psi / 120 sec delay | P45NCA-12C | Electronic time delay lube oil pressure protection for commercial compressors. |
| P70LB-1 | Condenser Fan Cycling | P70LB-1C | Direct pressure control for condenser fan speed/cycling in commercial refrigeration. |
5. Source Reference Documents & Resources
Source Reference Documents (PDF):
Related Resources & Categories:
6. Source Your Penn Controls From TCI Supply
We ship these products worldwide! Delivery is normally stock. Request a Quote now or call us at 1-800-755-2883 for expert assistance.
Cross-references are provided as a selection aid. Refrigeration and pressure controls require precise calibration and setpoint verification. Always verify voltage, pressure ratings, differential ranges, and capillary lengths against original equipment specifications before commissioning, or call us and we’ll verify it with you.