Carel WB000DG0F0 User Manual

44
ENG
UltraCella +0300083EN - rel. 1.5 - 07.02.2015
Par. Description Def Min Max U.M.
c7 Maximum pump down time (PD)
0 = Pump down disabled.
0 0 900 s
c8 Compressor start delay after opening of
pump down valve PD
5 0 60 s
H1 Confi guration of output AUX1
…5 = pump down valve
1 0 15 -
H5 Confi guration of output AUX2
…5 = pump down valve
1 0 15 -
P
T
M
E
S
F
L
C
CMP
V2
PDV
Fig. 6.d
Key
CMP Compressor
C Condenser
L Liquid receiver
P Low pressure switch
F Dehydrator fi lter
E Evaporator
S Liquid indicator
V2 Thermostatic expansion valves
PDV Pump down valve
You can select the pump down:
• on pressure (pressure switch mandatory): once the pump down
valve closes, the compressor continues to operate until reaching the
low pressure value (contact opened). At this point the compressor is
turned off . If the pressure switch does not change within the time c7,
alarm “Pd” triggers, pump down ended due to time-out. The Pd alarm
is reset automatically if in the next pump down low pressure is reached
within the time c7.
• on time (pressure switch optional): after the valve closes, the
compressor operates for the time c7. The ‘Pd’ alarm, Pump down ended
by time-out, is deactivated.
c10 = 0: Pressure pump down
Pressure switch changes within c7
Pressure switch changes after c7
Sv
Alarm Pd
Pressure
switch
PDV
CMP, FAN
c7
OFF
St
ON
OFF
ON
OFF
ON
OFF
ON
c7
Fig. 6.e Fig. 6.f
Key
CMP, FAN Compressor, fan
PDV pump down valve
Pressure switch Pressure switch
Sv Virtual probe
c7 Pump down maximum time
Pd Pump down alarm
t Time
St Set point
Note:
• if during the pump down there is a new demand for cooling, the pump
down procedure terminates, and the pump down valve is opened (the
compressor is already on from the previous pump down phase);
• in case of “Pd” alarm the auto-start function is disabled.
6.5 Autostart in pump down
As seen in the previous paragraph, once you reach the set point, the
control closes the pump down valve and then the pressure switch
changes and signals low pressure. If, due to problems of sealing of
the valve, the pressure switch changes again, you can reactivate the
compressor with the Auto start function, signalled by the message “Ats”.
This message is erased on the next correct pump down cycle
Par. Description Def Min Max U.M.
c9 Autostart in pump down
0 whenever pump down valve
closes
1 whenever pump down valve
closes & every request of
low pressure switch without
regulation request
001-
Sv
AtS
Pressure
switch
VPD
CMP, FAN
OFF
St
t
ON
OFF
ON
OFF
ON
OFF
ON
Fig. 6.g
Note: low pressure = pressure off /open.
Key
CMP, FAN Compressor, fan t Time
VPD Pump down valve AtS Autostart in pump down
St Set point Pressure switch Pressure switch
Sv Control probe
Notes:
• at compressor autostart, the safety times c1 and c2, not c3 are
respected;
• the message “AtS” is reset automatically on the next correct pump
down cycle.

Carel WB000DG0F0 Specifications

General

Brand	Carel
Model	WB000DG0F0
Category	Controller
Language	English