Danfoss 102 Bedienungsanleitung PDF herunterladen (Seite 4)

4 Manual RS8DY302 © Danfoss 07-2005 EKC 102

Start of defrost

A defrost can be started in diﬀerent ways

Interval: Defrost is started at ﬁxed time intervals, say, every

eighth hour

Refrigeration time:

Defrost is started at ﬁxed refrigeration time inter

vals, in other words, a low need for

refrigeration will ”postpone” the coming defrost

Contact Defrost is started here with a pulse signal on a

digital input.

Manual: An extra defrost can be activated from the control-

ler’s lower-most button

S5-temp. In 1:1 systems the eﬃciency of the evaporator can

be followed. Icing-up will start a defrost.

Start-up After a power cut the system can be started with a

defrost.

All the mentioned methods can be used at random – if just one

them is activated a defrost will be started. When the defrost starts

the defrost timers are set at zero

Refrigeration control with two compressors

The two compressors must be of the same size.

When the controller demands refrigeration it will ﬁrst cut in the

compressor with the shortest operating time. After the time delay

the second compressor will be cut in.

When the temperature has dropped to ”the middle of the diﬀeren

tial” the compressor with the longest operating time will be cut

out.

If the Compressor in operation is unable to lower the temperature

to the cutout point, the other compressor will be cut in again. This

happens when the temperature reaches the upper part of the

diﬀerential. If the temperature, on the contrary, remains ”stuck”

within the diﬀerential for two hours there will be a change-over

between the two compressors so that the operating time can be

equalised.

The compressors used must be of a type that is capable of starting

up against a high pressure.

Digital input

2 of the controllers has a digital input which can be used for the

following functions:

- Door contact function with alarm if the door has been open for

too long.

- Defrost start

- Start/stop of regulation

- Change-over to night operation

A pulse signal

starts the

defrost

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