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External display

Termination

Connect H-R

The capacity from the

digital scroll compressor

The capacity is divided into period times as "PWM period time". 100% capacity is delivered when cooling takes place for the whole

period.

An off time is required by the capacity control valve within the period and an on time is also permitted. There is "no cooling" when the

valve is on.

The controller itself calculates the capacity needed and will then vary it according to the cut-in time of the capacity control valve.

A limit is introduced if low capacity is needed so that the cooling does not go below 10%. This is because the compressor can cool

itself. This value can be increased if necessary.

Refrigeration / No refrigeration

Copeland Stream compressor

The signal can also be used to control one stream compressor with one unloading valve (4 cylinders version).

The compressor capacity is distributed by up to 50% for one relay and the remaining 50-100% for the unloader. The unloader is con-

nected to DO5 or DO6.

Bitzer CRII

The pulse signal can also be used to control one of the CRII with 2 unloaders (4 cylinders version).

Compressor capacity can be controlled from 10 to 100% depending on the pulsation of the unloaders. The unloader is connected to

DO5 or DO6.

Unloader 2 follows unloader 1

but is offset a ½ period.

AK-PC 551

Dimensions

Important!

Termination

Connect H-R

Period time

Min. capacity

Only DO5 or DO6

Unloader 1

Unloader 2