Description
The Johnson Controls / PENN MR12DR230-1 is an electronic refrigeration thermostat with "off cycle" defrost control from the MR10 Series - DIN-rail mounted, 230 V.
What it does, in Johnson Controls' words: "Thermostat with 'off cycle' defrost control - MR12. This control is specifically designed for the controls of static defrost refrigeration applications operating at positive temperatures."
Defrost functions, again from the manufacturer: "The defrost is initiated and terminated by a timer. The user sets the interval between successive cycles and its duration." So both how often the unit defrosts and how long each defrost lasts are set on the control, rather than being fixed or driven by an external time clock.
Specification:
* Product family: Johnson Controls / PENN MR10 Series electronic refrigeration controls
* Model: MR12 - thermostat with "off cycle" defrost control
* Mounting: DIN rail (the DR in the code)
* Supply: 230 V (the 230 in the code)
* Application: static defrost refrigeration operating at positive temperatures
* Defrost control: timer initiated and timer terminated; user-set interval and duration
* Condition: New
"Off cycle" defrost - make sure that is the system you have. Off-cycle, or static, defrost relies on the cabinet's own air temperature to clear frost from the evaporator while the compressor is stopped. It works only above freezing - which is why Johnson Controls specifies this control for applications operating at positive temperatures. It is the right control for a chilled display case or a walk-in cooler. It is not the right control for a freezer, where frost will not clear without heat and you need a hot-gas or electric defrost control instead. If your application runs below 0 °C, tell us and we will point you at the correct model.
Reading the code. Every element is documented: MR12 is the model, DR is DIN Rail mount (the panel-mount equivalents carry PM), and 230 is the supply voltage. Both 230 V and 24 V units appear in this series, so it is worth reading - but unlike much of the Johnson Controls catalogue, here the voltage is spelled out in digits rather than hidden behind a letter.
This is a refrigeration product, not a building-automation one. The MR10 Series is part of the Johnson Controls / PENN refrigeration line, and Johnson Controls directs application questions on these controls to its refrigeration application engineering team. Typical applications across the range are convenience store coolers, supermarket display cases, and reach-in and walk-in coolers.
Related MR10 controls we stock: the MR11PM230-1C - a panel-mount compressor controller, also 230 V, supplied with a temperature sensor. If you need compressor control rather than defrost timing, that is the one to look at.
* Brand / Manufacturer: Johnson Controls / PENN
* Model / Part Number: MR12DR230-1
* Product type: Refrigeration thermostat with off-cycle defrost control
* Mounting: DIN rail
* Supply: 230 V
* Suitable for: positive-temperature (above freezing) applications
* Condition: New
Tell us the cabinet temperature, the defrost method and the supply voltage and we will confirm the model.
Johnson Controls / Johnson Controls
MR12DR230-1 / MR12DR2301
MR12DR230-1 / MR12DR2301
Warranty Information
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