Carel + 0300028EN, User Manual, Page: 45 / 60

17
ENG
ir33+ VCC +040000058 - rel. 1.2 - 15.02.2018
In this case, the fan outputs are activated based on the following logic:
ON
OFF
St
t
rd/2
VCC
ON
OFF
rd/2
AUX
Fig. 3.i
Key:
St = Set point
rd = Diff erential
Sv = Virtual probe
CMP = Compressor output
AUX = Auxiliary output
3.1.12 Pump down
The pump down function can be activated when parameter H1 = 5 and c7 ≥ 7 . The AUX relay is thus used to
control the pump down valve. Digital input DI1 must be confi gured as a low pressure switch A4 = 8 , otherwise
pump down will be performed by time if c10 = 1 .
To start the pump down function, compressor control must fi rst stop. The pump down function can then start.
Pump down can be started immediately by setting
cct = 0 .
If c10 = 1 and no pressure switch is confi gured (A4 = 8), the pump down ends after the time set for c7 .
Compressor restart can be delayed for the time set for c8 .
Code Parameter UOM Dis. Def. Max Min
c7 Maximum pump down time (PD): 0 = Pump down disabled Sec C 0 900 0
c8 Compressor start delay after opening PD valve Sec C 5 60 0
c9 Autostart in pump down: 0 = Disabled -
1 = Pump down whenever closing pump down valve and following low
pressure switch activation with no cooling demand - C 1 1 0
c10 Pump down by time or pressure: 0 = pressure; 1 = time - C 0 1 0
A4 Digital input 1 confi guration (DI1): 8 = low pressure switch min C 0 1 0
H1 AUX1 output confi guration
0: normally energised alarm
1: normally de-energised alarm
2: auxiliary
3: light
4: auxiliary evaporator defrost
5: pump down valve
6: condenser fan
7: delayed compressor
8: auxiliary with deactivation when OFF
9: light with deactivation when OFF
10: no function
11: reverse with neutral zone
12: second compressor step
13: no function
14: condensate drain heater - C 10 14 0
Tab. 3.k