Description
The Johnson Controls / PENN MR4PM24-12C is a four-stage defrost control module - panel mount, 24 V, supplied with two A99BB-200C temperature sensors.
In Johnson Controls' own catalogue wording: "MR4PM24-12C - MR4 Four Stage, PANEL 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: panel mount (the PM in the code)
* Supply: 24 V (the 24 in the code)
* Included: two A99BB-200C temperature sensors
* Condition: New
Panel mount or DIN rail - that is the only difference from the MR4DR24-12C. The two are the same four-stage control at the same voltage with the same two sensors; one fixes into a cut-out in a panel fascia, the other clips onto a DIN rail inside an enclosure. Choose on how the control has to be presented, not on function. If the user needs to see and adjust it, panel mount is the one; if it lives inside a control panel alongside contactors and terminals, DIN rail is tidier. Both are in stock, so tell us which fixing you have and we will send the right one.
Two sensors are in the box - check that against any cheaper quote. Johnson Controls includes two A99BB-200C sensors with this control. A defrost control needs sensing to work, and a competing listing that looks cheaper may well be the bare module. Compare what arrives, not what is listed.
Mind the voltage. Both 24 V and 230 V units sit in this series, and here the voltage is spelled out in digits rather than hidden behind a letter. This one is 24 V. Neighbouring models in our catalogue are 230 V - 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.
Unlike an off-cycle control, this one suits freezers. Johnson Controls lists freezers with hot gas or electric defrost among the MR range's applications. That matters because the simpler off-cycle defrost thermostats in the same family - such as the MR12 - work only above freezing and will not clear frost in a freezer. If your application runs below zero and has a defrost heater or hot gas loop, a multi-stage control of this kind is the right class of product.
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 to its refrigeration application engineering team.
Related controls we stock: MR4DR24-12C (DIN rail, 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: MR4PM24-12C
* Product type: Four-stage defrost control module
* Mounting: Panel mount
* 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
MR4PM24-12C / MR4PM2412C
MR4PM24-12C / MR4PM2412C
Warranty Information
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