Condensing unit controller
Function
Code
Min.value
Max.value
Default
controller
settings
Unit controller
settings
Read-out of operating time of heating element in crankcase.
(Value must be multiplied by 1,000). The value can be adjusted
P50
-
-
0 h
Read-out of number of HP alarms. The value can be adjusted
P51
-
-
0
Read-out of number of LP alarms. The value can be adjusted
P52
-
-
0
Read-out of number of Td alarms. The value can be adjusted
P53
-
-
0
Oil return management. Compressor speed for the counter
starting point
P77
30 rps
70 rps
40 rps
Oil return management. Limit value for counter
P78
5 min.
720 min.
20 min.
Oil return management. Boost-speed
P79
40 rps
100 rps
50 rps
Oil return management. Boost-time
P80
10 s
600 s
60 s
Service
Readout pressure on Pc
u01
bar
Readout temperature Taux
u03
°C
Status on DI1 input. 1=on=closed
u10
Status on night operation (on or off) 1=on=night operation
u13
Readout superheat
u21
K
Readout temperature at S6 sensor
u36
°C
Status on DI2 input. 1=on=closed
u37
Readout the compressor capacity in %
u52
%
Status on relay to compressor. 1=on=closed
**
u58
Status on relay to fan. 1=on=closed
**
u59
Status on relay to alarm. 1=on=closed
**
u62
Status on relay “Aux”. 1=on=closed
**
u63
Status on relay to heating element in crank case. 1=on=closed
**
u71
Status on high voltage input DI3. 1=on=230 V
u87
Readout condensing pressure in temperature
U22
°C
Readout pressure Ps
U23
bar
Readout suction pressure in temperature
U24
°C
Readout ambient temperature Tamb
U25
°C
Readout discharge temperature Td
U26
°C
Readout suction gas temperature Ts
U27
°C
Readout the voltage on the output AO1
U44
V
Readout the voltage on the output AO2
U56
V
NOTICE
Following controller parameters are
modified from factory setting by condensing unit
production.
All Other parameters in «unit controller setting»
are same as "Default controller setting"
- r12: 1 (main switch = ON).
- c71: 2 (compressor type = variable speed
compressor).
- c73: 25.8 (max. condensing pressure =
25.8bar(g)).
- c75: 2.0 (min. suction pressure = 2.0 bar(g)).
- o30: 41 (refrigerant: 19=R404A, 21=R407A,
37=R407F, 40=R448A, 41=R449A).
- o61: 55, 56 or 57 (compressor size: 55=VLZ028,
56=VLZ035, 57=VLZ044).
Following parameter should be modified by
installer if controller is used as pump down device.
- c33: 2.3 (pump down limit, should be min.
0.3bar higher than c75 to avoid
unwanted alarms).
Modification of controller parameters shall be
done by qualified persons only.
In case of any problems with controller it is
possible to connect unit bypassing it: see details in
chapter 4.3.1 of this guideline.
35
FRCC.PC.044.A6.02
Application Guidelines
