Johnson Controls MR2PM24-11 Defrost Control

The Johnson Controls MR2PM24-11 is a high-precision two-stage temperature control designed specifically for defrost management and HVACR system monitoring. Operating on 24 VAC, this panel mount controller delivers an impressive ± 1.8°F accuracy, ensuring tight regulation of refrigeration cycles. As the direct functional replacement for the MR2DR24-11, it transitions from DIN rail to a secure panel configuration while maintaining full A99 sensor compatibility. This unit provides comprehensive alarm management for critical temperature excursions, utilizing relay outputs to manage compressor and defrost heater sequencing. The inclusion of the A99BB-200C sensor allows for immediate field integration. Whether managing walk-in coolers or commercial freezers, the MR2PM24-11 offers robust setpoint control and differential adjustments required for professional-grade cold chain maintenance and evaporator coil protection.

Key Benefits

• Dual Stage Control: Enables precise sequencing of cooling and defrost cycles for optimized thermodynamic performance.
• High Precision Sensing: The NTC thermistor technology provides reliable feedback with Minimal thermal drift.
• Integrated Alarm Management: Built-in status indicators and logic outputs alert technicians to parameter deviations before inventory loss occurs.
• Direct Replacement Logic: Serves as the updated panel mount equivalent to the legacy MR2DR24-11, streamlining retrofits.
• Field Ready: Ships with the A99BB-200C sensor to ensure matched impedance and calibrated accuracy right out of the box.

Common Questions

What are the wiring requirements for the MR2PM24-11?
This controller requires a dedicated 24 VAC power supply. Relays should be wired according to the inductive load ratings specified for your specific refrigeration compressor or defrost heater contactor.

Can I use a different sensor with this defrost control?
The MR2PM24-11 is calibrated for the Johnson Controls A99 series. Using non-compatible thermistors will result in incorrect temperature logging and system errors.

How does this model differ from the MR2DR24-11?
The internal logic and electrical specifications are identical; however, the MR2PM24-11 uses a panel mount housing rather than a DIN rail track mount. Verify your enclosure space before installation.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.