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8 Manual RS8DY302 © Danfoss 07-2005 EKC 102

Functions

Function No.

Normal display

Normal display shows the temperature value from the

thermostat sensor Sair.

Thermostat

Set point

Regulation is based on the set value. The value is set via a

push on the centre button.

The set value can be locked or limited to a range with the

settings in r02 and r03.

Diﬀerential

When the temperaure is higher than the reference + the

set diﬀerential, the compressor relay will be cut in. It will

cut out again when the temperature comes down to the

set reference.

r01

Setpoint limitation

The controller’s setting range for the setpoint may be

narrowed down, so that much too high or much too low

values are not set accidentally - with resulting damages.

To avoid a too high setting of the setpoint, the max. al

lowable reference value must be lowered.

r02

To avoid a too low setting of the setpoint, the min. allow

able reference value must be increased.

r03

Correction of the display’s temperature showing

If the temperature at the products and the temperature

received by the controller are not identical, an oﬀset

adjustment of the shown display temperature can be

carried out.

r04

Temperature unit

Set here if the controller is to show temperature values in

°C or in °F.

r05

Correction of signal from Sair

Compensation possibility through long sensor cable.

r09

Start / stop of refrigeration

With this setting refrigeration can be started, stopped or

a manual override of the outputs can be allowed.

1 = regulation

0 = regulation is stopped

-1 = regulation is stopped - override allowed.

Stopped regulation will give a "Standby alarm".

r12

Night setback value

The thermostat’s reference will be the setpoint plus this

value when the controller changes over to night opera

tion. (Select a negative value if the function is used for

”quick cooling”.)

r13

Alarm

The controller can give alarm in diﬀerent situations.

When there is an alarm all the light-emitting diodes (LED)

will ﬂash on the controller front panel

Alarm delay (short alarm delay)

If one of the two limit values is exceeded, a timer func

tion will commence. The alarm will not become active

until the set time delay has been passed. The time delay

is set in minutes.

A03

Time delay for door alarm

The time delay is set in minutes.

The function is deﬁned in o02.

A04

Ref. Dif.

Time delay for cooling (long alarm delay)

This time delay is used during start-up (recovery time),

during defrost, in the cooling phase after a defrost.

There will be change-over to the normal time delay (A03)

when the temperature has dropped below the set upper

alarm limit.

The time delay is set in minutes.

A12

Upper alarm limit

Here you set when the alarm for high temperature is to

start. The limit value is set in °C (absolute value). The limit

value will be raised during night operation. The value is

the same as the one set for night setback, but will only

be raised if the value is positive.

A13

Lower alarm limit

Here you set when the alarm for low temperature is to

start. The limit value is set in °C (absolute value).

A14

High alarm limit for condenser temperature

If the Saux sensor is used for monitoring the condenser’s

temperature you must set the value at which the alarm

is to become activated. The value is set in °C. There is

no alarm delay. The alarm disappears again when the

temperature has dropped 10 degrees. Deﬁnition of Saux

takes place in o69.

A37

Compressor

The compressor relay works in conjunction with the

thermostat. When the thermostat calls for refrigeration

will the compressor relay be operated.

Running times

To prevent irregular operation, values can be set for the

time the compressor is to run once it has been started.

And for how long it at least has to be stopped.

The running times are not observed when defrosts start.

Min. ON-time (in minutes)

c01

Min. OFF-time (in minutes)

c02

Time delay for couplings of two compressors

Settings indicate the time that has to elapse from the

ﬁrst relay cuts in and until the next relay has to cut in.

c05

Reversed relay function for compressor relay

0: Normal function where the relay cuts in when refrig-

eration is demanded

1: Reversed function where the relay cuts out when

refrigeration is demanded (this wiring produces the

result that there will be refrigeration if the supply volt-

age to the controller fails). (When two compressors are

cut in and out the two relays will operate in opposite

directions).

c30

Defrost

The controller contains a timer function that is zeroset

after each defrost start.

The timer function will start a defrost if/when the interval

time is passed.

The timer function starts when voltage is connected to

the controller, but it is displaced the ﬁrst time by the set

ting in d05.

This timer function can be used as a simple way of star-

ting defrosts, but it will always act as safety defrost if one

of the subsequent defrost starts is not received.

Defrost start can also be accomplished via contact sig

nals or manual start-up.

All starting methods will function in the controller. The

diﬀerent functions have to be set, so that defrosts do not

”come tumbling” one after the other.

Defrost can be accomplished with electricity or natural

defrost.

The actual defrost will be stopped based on time or tem-

perature with a signal from a temperature sensor.

Here is a description of the individual functions.

A controller only contains this part of the functions. Cf. the menu

survey.

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