O'Clair 55234 Instruction Manual Download

Page: 38 / 138

TECHNICAL MANUAL. START-UP AND OPERATION

Basic Operating Principle

Temperature controlling

The controller has 2 temperature controlling mode: Refrigeration and Heat (F29).Temperature controlling point is controlled by “set-
ting temperature (F11, or press the “set” key for some time to “set”) and “temp. difference (F12)”. In refrigeration mode, the

controller begins to refrigerate when the temperature of the temperature sensor is over “setting tempe temperature diffe-
rence”, and it stops refrigerating when the temperature is under “setting temperature - temperature difference”.

In heat mode, the controller begins to heat when the temperature of the temperature sensor is under “setting temperature - tem-
perature difference”, and it stops heating when the temperature is over “setting tempe temperature difference”

Compressor delay time

The compressor delay time is set by F21, for example, 3 minutes. The controller contains a “compressor halt calculagraph”, and

it begins to time when compressor stops, the program ECO check the calculagraph before booting the compressor next time, the

program will immediately boot the compressor if the calculagraph reach 3 minutes.

If the calculagraph doesn’t reach 3 minutes, it will boot again when the calculagraph reaches 3 minutes. Thus you can ensure that

the boot alternation is over 3 minutes after halt, so it can prevent to breaking the compressor as a result of frequent boot.

In addition, the controller doesn’t boot the compressor within

minutes after turning on the power supply, thus the compressor can

also be protected in the state of power cut and then power on.

Auto defrosting principle

The controller ECO detects the temperature of outdoor machine when it begins to heat. If it is lower than “defrost start temperatu-
re”, the controller will ECO turn on defrosting, then turn on heating after defrosting ends. In addition, the controller will supervise

the temperature of outdoor machine when heating normally, and decide whether need to defrost according to the time of the out-
door machine in the continuous low temperature state. In other words, the defrosting calculagraph begins to time when the outdo-
or machine temperature is lower than “defrost start temperature”, and turns on the defrosting when the value of time reaches

“defrost start time”.

The calculagraph will be cleared if the outdoor machine temperature is higher than “defrost start temperature” when timing, and it

begins to time again when the outdoor machine temperature is lower than “defrost start temperature” next time. In other words,

the value of defrosting calculagraph shows the continuous low temperature time of the outdoor machine.

The controller will turn on the compressor and cross valve after defrosting, and the heat pump is used for defrosting.

The controller can check the defrosting effect with the temperature of outdoor machine, if the temperature of outdoor machine goes

up to the “defrost end temperature”, the controller will turn off the function of defrosting. If the defrosting time is above “max defrost

time”, the controller will turn off defrosting forcibly.