Danfoss AK-PC 420 User Manual page 10

Alarm delay DI2 (an interrupted input will give alarm).
The time delay is set in minutes. At min. setting the alarm is cancelled.
Alarm delay DI3 (an interrupted input will give alarm).
The time delay is set in minutes. At min. setting the alarm is cancelled.
Pump alarm delay
The time delay is set in seconds. At min. setting the alarm is cancelled.
Give the top button a brief push to zeroset the alarm and to have the message shown
on the display.
Miscellaneous
Choice of application
The regulator can be configured in various ways. The application that is required out
of the six applications available is set here.
1: S7 + 3-way valve + Step of fans
2: S7 + 3-way valve + VSD (speed) of fans
3: Pc + 3-way valve + Step of fans
4: Pc + 3-way valve + VSD (speed) of fans
5: S8 + Step of fans
6: S8 + VSD (speed) of fans
Sensor type (Sc3, S7 and S8)
Normally a Pt1000 sensor with great signal accuracy is used for temperature measure-
ment. But a PTC sensor may also be used (r25 = 1000) in special situations.
0=Pt1000
1=PTC1000
Pressure transmitter's working range
Depending on the pressure, a pressure transmitter with a given working range is
used. This working range must be set in the controller (e.g.: -1 to 34 bar
The values must be set in bar if display in °C has been selected. And in psig, if °F has
been selected.
Pc-Min. value
Pc-Max. value
Use of DI4 input
The digital input can be connected to a contact function, and the contact can now be
used for one of the following functions:
Setting / function:
0: DI input not used
1: Safety signal from high-pressure pressure control. If the signal is cut off, all capacity
is cut in. There is no time delay.
Operating hours
The operating hours for the pomp relays can be read and set in the following menus.
The read value is multiplied by 1000 to obtain the number of hours (fx. shows 2.1 for
2100 hours). On reaching 99.9 hours the counter stops and must now be reset to, say,
0. There will be no alarm or error message for counter overflow.
Value for relay number 7 (pump 1)
Value for relay number 8 (pump 2)
Refrigerant setting (only if a Pc pressure transmitter is fitted)
Before refrigeration is started, the refrigeration must be defined. You may choose
between the following refrigerants:
1=R12. 2=R22. 3=R134a. 4=R502. 5=R717. 6=R13. 7=R13b1. 8=R23. 9=R500.
10=R503. 11=R114. 12=R142b. 13=User defined. 14=R32. 15=R227. 16=R401A.
17=R507. 18=R402A. 19=R404A. 20=R407C. 21=R407A. 22=R407B. 23=R410A.
24=R170. 25=R290. 26=R600. 27=R600a. 28=R744. 29=R1270. 30=R417A.
31=R422A. 32=R413A. 33=R422D. 34=R427A. 35=R438A.
Warning: Wrong selection of refrigerant may cause damage to the compressor.
Other refrigerants: Select setting 13 here, and subsequently three factors have to be
set – fac1, fac2 and fac3 – via AKM.
10 Manual RS8EL402 © Danfoss 03-2010
A28 DI2AlrmDelay
A29 DI3AlrmDelay
A63 Pump Al. Del
Reset alarm
The function zerosets all alarms when
set in pos. ON.
With data communication the impor-
tance of the individual alarms can be
defined. Setting is carried out in the
"Alarm destinations" menu.
Miscellaneous
o61 Applic.Mode
o06 Sensor type
If the values are to be set from the
AKM programme, they must be set in
bar.
o47 PcMinTrsPres
o48 PcMaxTrsPres
o22 DI4 control
(In the AKM display the hour number
has not been multiplied)
o52 DO7 run hour
o53 DO8 run hour
o30 Refrigerant
AK-PC 420