Danfoss AK-CC55 Water Loop - Alarm Limits and Delays

Function
Description
Values
Code
Short name
S4 frost protection
Frost protection on S4 air temperature. If the S4 tem-
perature sensor measure a temperature lower than
the set limit, refrigeration will be stopped in order to
protect products from ice formation. Refrigeration
will start again when the S4 temperature has risen 2K
above the set limit
r98
r98 S4 Min Lim
Air heater neutral
zone
Heat function. Set the width of the Neutral Zone for
changeover from cooling to heating
r62
r62 Heat NZ
Air heater start de-
lay
Time delay on transition from refrigeration phase to
heating phase (there is no time delay on transition
from heating phase to refrigeration)
r63
r63 HeatStartDel
Melt interval
Melt function. Only for control of MT cases/rooms (-5
to +10°C). The function ensures that the evaporator
will not be blocked by ice crystals. Here you set how
often the function is to stop the refrigeration and
hence transform the ice crystals to water.
r16
r16 MeltInterval
Melt period
Melt period. Here you set how long an ongoing melt
function is to last
r17
r17 Melt period
Alarm limits and delays
Table 22: Alarm limits and delays
Function
Description
Values
Code
Short name
Control state A
Readout of the actual control state of the controller
0=Normal ctrl., 1=Hold after defrost, 2=Min ON timer,
3=Min OFF timer, 4=Drip o, 10=Main switch OFF,
11=Thermostat cut-out, 12=Frost protection S4,
14=Defrost, 15=Fan delay, 17=Door open, 18=Melt
period, 19=Modulating temp. control, 20=Emergency
control, 25=Manual control, 29=Case cleaning,
30=Forced cooling, 32=Power-up delay, 33=Air heat-
ing, 34=Comp. safety cut-out, 45=Shut down control-
ler, 50=High S7 Brine inlet
u00
u00 Ctrl. state
Alarm status
Actual alarm status
0=OFF, 1=ON
x16
--- Sum alarm
Alarm air temp. A
Measured temperature for alarm thermostat
u57
u57 Alarm air
High alarm limit
Readout of actual high alarm limit for the tempera-
ture monitoring
y10
--- High al. lim
Low alarm limit
Readout of actual low alarm limit for the temperature
monitoring
y11
--- Low al. lim
S3 Air ON evap. A
Actual sensor value
u12
u12 S3 air temp.
S4 Air OFF evap. A
Actual sensor value
u16
u16 S4 air temp.
Reset alarms
Command for resetting all alarms, unless they are still
active
0=OFF, 1=ON
x15
--- Reset alarm
Alarm sensor S4% A
Signal to the alarm thermostat Here you have to de-
ne the ratio between the sensors which the alarm
thermostat has to use. S3, S4 or a combination of the
two. With setting 0% only S3 is used. With 100% only
S4 is used
A36
A36 Alarm S4 %
High alarm limit 1
Upper alarm limit. The limit value is set in absolute
value. The limit value will be raised with the night o-
set during night operation.
A13
A13 HighLim Air
Low alarm limit 1
Lower alarm limit. The limit value is set in absolute
value
A14
A14 LowLim Air
High alarm limit 2
Upper alarm limit. The limit value is set in absolute
value. The limit value will be raised with the night o-
set during night operation.
A20
A20 HighLim2 Air
Low alarm limit 2
Lower alarm limit. The limit value is set in absolute
value
A21
A21 LowLim2 Air
Alarm delay A
Alarm delay (short alarm delay on air temperature). If
the upper or the lower alarm limit values are excee-
ded, a timer function will commence. The alarm will
not become active until the set time delay has been
passed. The time delay is set in minutes
A03
A03 Alarm delay
Alarm delay pull
down A
Alarm delay at tempeature pull down conditions
(long alarm delay). This time delay is used during
start-up, during defrost and immediately after a de-
frost. There will be a change-over to the normal time
delay when the temperature has dropped below the
set upper alarm limit.
A12
A12 Pulldown del
Door open alarm
delay
Time delay for door alarm
A04
A04 DoorOpen del
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AK-CC55 Water Loop