Description
The Johnson Controls / PENN MR4DR24-12C is a four-stage defrost control module - DIN rail mount, 24 V, supplied with two A99BB-200C temperature sensors.
In Johnson Controls' own catalogue wording: "MR4DR24-12C - MR4 Four Stage, DIN RAIL MOUNT Defrost Control, 2 A99BB-200C sensors included."
Specification:
* Product family: Johnson Controls / PENN MR Series refrigeration controls
* Model: MR4 - four-stage defrost control
* Mounting: DIN rail (the DR in the code)
* Supply: 24 V (the 24 in the code)
* Included: two A99BB-200C temperature sensors
* Condition: New
Two sensors are in the box - check that against any cheaper quote. Johnson Controls includes two A99BB-200C sensors with this control. That is real, chargeable content: a defrost control needs sensing to work, and a competing listing that looks cheaper may well be the bare module. When you are comparing prices, compare what arrives.
Reading the code. Every element is documented: MR4 is the four-stage model, DR is DIN Rail mount, and 24 is the supply voltage. The panel-mount equivalent is the MR4PM24-12C, which we also stock - identical control, different enclosure and fixing.
Mind the voltage. Both 24 V and 230 V units sit in this series, and on these controls the voltage is spelled out in digits rather than hidden behind a letter. This one is 24 V. Its neighbours in our catalogue include 230 V models - read the number before ordering or substituting.
Typical applications across the MR range, as listed by Johnson Controls: convenience store coolers and freezers, supermarket display cases, reach-in and walk-in coolers, freezers with hot gas or electric defrost, and cooling tower pump control.
Four stages - what that buys you. A multi-stage defrost control can sequence several outputs from one device: typically compressor, defrost heater, evaporator fan and an alarm or auxiliary. On a case or walk-in that replaces a small panel of separate relays and timers with one module, and puts the defrost interval and duration in one place where they can be set and checked.
This is a refrigeration product, not a building-automation one. The MR Series belongs to the Johnson Controls / PENN refrigeration line, and Johnson Controls directs application questions on these controls to its refrigeration application engineering team rather than to building controls.
Related controls we stock: MR4PM24-12C (panel mount, 24 V, same two sensors), MR4PMUHV-12C (panel mount), MR11PM230-1C compressor controller and MR12DR230-1 off-cycle defrost thermostat.
* Brand / Manufacturer: Johnson Controls / PENN
* Model / Part Number: MR4DR24-12C
* Product type: Four-stage defrost control module
* Mounting: DIN rail
* Supply: 24 V
* Sensors: Two A99BB-200C included
* Condition: New
Tell us the cabinet, the defrost method and the supply voltage and we will confirm the model.
Johnson Controls / Johnson Controls
MR4DR24-12C / MR4DR2412C
MR4DR24-12C / MR4DR2412C
Warranty Information
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