MICRO-AIR Artic Air 24 Guía de instalación descargar pdf (Pagina 46)

ECM Controller

The ECM controller replaces the standard thermostat and is very similar in appearance and

operation. The difference is that the ECM controller regulates the system operation based on

two sets of parameters rather than just one. This feature enables the control system to know

when the engine and/or generator is running and use the additional power being generated to

“top-off” the holding plate without over-cooling it.

The ECM controller recognizes the presence of additional power (ie. a running auxiliary or

generator) when a positive DC current is applied to the proper terminal in the Control Box via the

key switch or oil pressure switch. It does not respond to a rise in buss voltage. Therefore, it is

not activated by a shore-power charger, wind generator or solar panels. During normal operation

the system is governed by the values programmed in the first set of parameters. When the

engine is started, the system begins operating from the second set of parameters.

Programming the ECM is identical to the digital thermostat. However, as you program you will

notice that two “setpoints” (St1, St 2) and two “differentials” (P 1, P 2) are given rather than one.

The first “setpoint” (St 1) and “differential” (P 1) are active in the “normal” mode and control the

system when the engine (or generator) is not running. The second set of parameters (St 2 and P

2) take over whenever the engine or generator is started and control the system in “engine-drive”

mode.

ECM Control Settings

Always set both “setpoints” (St 1 and St 2) to the same value since this determines the ultimate

freeze-down temperature which is the same in any mode. Use one of the methods described

above for determining the correct setting for “St 1" then simply set “St 2" to the same value.

After determining the correct value for the “P 2" differential setting (again, use one of the above

methods), you will want to set the value of the second “differential” (P2) to be several degrees

lower than that of the first (P1). By doing so, you will instruct the compressor to start sooner

when the engine is running than it does under normal operation. This allows the system to “top

off” a partially thawed holding plate whenever the engine or generator is started.

The ECM Status Indicator Light

As the Holding Plate temperature rises, the indicator light will begin blinking with single flashes

when the value programmed into the second set of parameters ( a lower “differential” setting) is

reached. At this point the box is “calling for cooling” and the compressor will activate only if the

engine is started. As the plate warms further it eventually reaches the higher values programed

into the first set of parameters. The indicator light then begins blinking in double flashes and the

compressor activates in normal mode.

Box Temperature Monitor

The standard thermostat and ECM controller come with a single temperature probe and provide

a continuous display of the holding plate temperature by which they control the system operation.

Either control may be equipped with the optional box temperature monitor. This option provides

a second temperature probe which monitors the air temperature of the box in addition to the

plate temperature. Digital thermostats and ECM controllers equipped with this option will

continuously display the box temperature. The holding plate temperature can be displayed by

pressing the down “ARROW” key.

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MICRO-AIR Artic Air 24 Guía de instalación Pagina 46